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Format
Article Type
Journal
Publisher
Section
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
-
Africa
-
Afar (1)
-
Cape Verde Islands (1)
-
Central Africa
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Angola (2)
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Central African Republic (1)
-
-
East Africa
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Ethiopia (1)
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Kenya
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Kenya Rift valley (1)
-
-
Lake Natron (1)
-
Malawi (3)
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Tanzania
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Laetoli (1)
-
Oldoinyo Lengai (28)
-
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Zambia (4)
-
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East African Lakes
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Lake Baringo (1)
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Lake Natron (1)
-
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East African Rift (7)
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Gregory Rift (3)
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Madagascar
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Antananarivo Madagascar (1)
-
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North Africa
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Morocco (1)
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Southern Africa
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Namibia (2)
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South Africa
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KwaZulu-Natal South Africa (1)
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Limpopo South Africa (1)
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North-West Province South Africa (1)
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Transvaal region (1)
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Zimbabwe (1)
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Zambezi Valley (1)
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Arctic region
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Greenland
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Igaliku Complex (1)
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Ilimaussaq (2)
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South Greenland (2)
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Asia
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Altai Mountains
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Chuya Alps (1)
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Gorny Altai (1)
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Altai Russian Federation
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Gorny Altai (1)
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Chuya Alps (1)
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Far East
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China
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Dabie Mountains (1)
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Inner Mongolia China (2)
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Jiangsu China (1)
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Liaoning China
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Liaodong Peninsula (1)
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Tarim Platform (1)
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Indonesia
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Tambora (1)
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Japan
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Honshu
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Shimane Japan (1)
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Korea
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South Korea (1)
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Lesser Sunda Islands
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Tambora (1)
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Indian Peninsula
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India
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Andhra Pradesh India (1)
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Gujarat India
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Amba Dongar (1)
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Southern Granulite Terrain (1)
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Tamil Nadu India
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Kodaikanal India (1)
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Kamchatka Russian Federation
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Kamchatka Peninsula
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Avacha (1)
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Koryak Range (1)
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Krasnoyarsk Russian Federation (1)
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Maymecha-Kotuy (1)
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Russian Far East (1)
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Russian Pacific region (1)
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Sakhalin Russian Federation
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Kuril Islands
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Etorofu Island
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Kudryavyy (1)
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Siberia (1)
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Siberian Platform
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Aldan Shield (1)
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Sri Lanka (1)
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Tajikistan (2)
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Western Transbaikalia (1)
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Yakutia Russian Federation
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Udachnaya Pipe (4)
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Udachnaya Russian Federation (1)
-
-
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Atlantic Ocean
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North Atlantic
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North Sea
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Gullfaks Field (1)
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Atlantic Ocean Islands
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Cape Verde Islands (1)
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Australasia
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Australia
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Western Australia (1)
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New Zealand
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Westland New Zealand (1)
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Canada
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Eastern Canada
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Ontario (2)
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Quebec
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Oka Complex (2)
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Ungava (1)
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Central America
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Nicaragua (1)
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Clara Mine (1)
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Commonwealth of Independent States
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Russian Federation
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Altai Russian Federation
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Gorny Altai (1)
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Bashkortostan Russian Federation (1)
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Chuya Alps (1)
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Kamchatka Russian Federation
-
Kamchatka Peninsula
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Avacha (1)
-
-
-
Koryak Range (1)
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Krasnoyarsk Russian Federation (1)
-
Maymecha-Kotuy (1)
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Murmansk Russian Federation
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Khibiny Mountains (4)
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Kola Peninsula (6)
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Kovdor Massif (1)
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Lovozero Massif (2)
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Russian Far East (1)
-
Russian Fennoscandia (1)
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Russian Pacific region (1)
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Sakhalin Russian Federation
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Kuril Islands
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Etorofu Island
-
Kudryavyy (1)
-
-
-
-
Siberian Platform
-
Aldan Shield (1)
-
-
Western Transbaikalia (1)
-
Yakutia Russian Federation
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Udachnaya Pipe (4)
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Udachnaya Russian Federation (1)
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-
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Tajikistan (2)
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Urals
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Southern Urals (1)
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Europe
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Bashkortostan Russian Federation (1)
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Central Europe
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Black Forest (1)
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Germany
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Baden-Wurttemberg Germany (1)
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Eifel (2)
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Slovakia (1)
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Upper Rhine Graben (1)
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Fennoscandia
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Russian Fennoscandia (1)
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Fennoscandian Shield (1)
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Murmansk Russian Federation
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Khibiny Mountains (4)
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Kola Peninsula (6)
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Kovdor Massif (1)
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Lovozero Massif (2)
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Rhenish Schiefergebirge
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Eifel (2)
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Southern Europe
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Iberian Peninsula
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Central Iberian Zone (1)
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Spain
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Iberian Mountains (1)
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Italy
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Umbria Italy (1)
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Variscides (1)
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Western Europe
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France
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Pas-de-Calais France (1)
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Pyrenees-Atlantiques France (1)
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Ireland (1)
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Scandinavia
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Norway (2)
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Indian Ocean Islands
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Heard Island (1)
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Madagascar
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Antananarivo Madagascar (1)
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Lake Victoria (3)
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North America
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Canadian Shield
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Churchill Province
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Cape Smith fold belt (1)
-
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Grenville Province (1)
-
-
-
Oceania
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Polynesia
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Tonga
-
Tofua (1)
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-
-
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Pacific Ocean
-
North Pacific
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Northwest Pacific
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Japan Sea (1)
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-
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West Pacific
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Northwest Pacific
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Japan Sea (1)
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Red Sea region (1)
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Russian Platform
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Russian Fennoscandia (1)
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South America
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Brazil
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Goias Brazil (1)
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Mato Grosso Brazil (1)
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Minas Gerais Brazil (1)
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Chile
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Antofagasta Chile
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Lascar (1)
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-
-
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South Island (1)
-
United States
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Alaska (1)
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California (2)
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Midcontinent (1)
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New York (1)
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Vulture Mountain (1)
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White Island (1)
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commodities
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brines (1)
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diamond deposits (1)
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glass materials (1)
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metal ores
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beryllium ores (1)
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cobalt ores (1)
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gold ores (1)
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iron ores (3)
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nickel ores (1)
-
niobium ores (2)
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rare earth deposits (3)
-
tantalum ores (1)
-
zirconium ores (1)
-
-
mineral deposits, genesis (9)
-
mineral exploration (3)
-
oil and gas fields (1)
-
petroleum (1)
-
phosphate deposits (3)
-
sodium carbonate (4)
-
-
elements, isotopes
-
boron
-
B-11/B-10 (1)
-
-
carbon
-
C-13/C-12 (17)
-
-
halogens
-
bromine (1)
-
chlorine
-
chloride ion (1)
-
-
fluorine
-
fluoride ion (1)
-
-
-
hydrogen
-
deuterium (1)
-
-
isotope ratios (37)
-
isotopes
-
radioactive isotopes
-
Pb-206/Pb-204 (4)
-
Pb-207/Pb-204 (2)
-
Pb-208/Pb-204 (2)
-
Pb-210 (1)
-
Po-210 (1)
-
Ra-226 (1)
-
Rb-87/Sr-86 (2)
-
Sm-147/Nd-144 (1)
-
Th-230 (1)
-
U-238 (1)
-
U-238/Pb-204 (1)
-
-
stable isotopes
-
B-11/B-10 (1)
-
C-13/C-12 (17)
-
deuterium (1)
-
Hf-177/Hf-176 (1)
-
Mg-25/Mg-24 (1)
-
Mg-26/Mg-24 (2)
-
N-15/N-14 (1)
-
Nd-144/Nd-143 (10)
-
O-18/O-16 (19)
-
Pb-206/Pb-204 (4)
-
Pb-207/Pb-204 (2)
-
Pb-207/Pb-206 (2)
-
Pb-208 (1)
-
Pb-208/Pb-204 (2)
-
Rb-87/Sr-86 (2)
-
S-34/S-32 (2)
-
Sm-147/Nd-144 (1)
-
Sr-87/Sr-86 (16)
-
-
-
large-ion lithophile elements (1)
-
metals
-
actinides
-
thorium
-
Th-230 (1)
-
-
uranium
-
U-238 (1)
-
U-238/Pb-204 (1)
-
-
-
alkali metals
-
cesium (2)
-
lithium (2)
-
potassium (6)
-
rubidium
-
Rb-87/Sr-86 (2)
-
-
sodium (2)
-
-
alkaline earth metals
-
barium (2)
-
calcium (2)
-
magnesium
-
Mg-25/Mg-24 (1)
-
Mg-26/Mg-24 (2)
-
-
radium
-
Ra-226 (1)
-
-
strontium
-
Rb-87/Sr-86 (2)
-
Sr-87/Sr-86 (16)
-
-
-
aluminum (1)
-
bismuth (1)
-
copper (1)
-
gold (1)
-
hafnium
-
Hf-177/Hf-176 (1)
-
-
iron (2)
-
lead
-
Pb-206/Pb-204 (4)
-
Pb-207/Pb-204 (2)
-
Pb-207/Pb-206 (2)
-
Pb-208 (1)
-
Pb-208/Pb-204 (2)
-
Pb-210 (1)
-
U-238/Pb-204 (1)
-
-
manganese (3)
-
niobium (2)
-
platinum group (1)
-
polonium
-
Po-210 (1)
-
-
rare earths
-
cerium (4)
-
lanthanum (1)
-
neodymium
-
Nd-144/Nd-143 (10)
-
Sm-147/Nd-144 (1)
-
-
samarium
-
Sm-147/Nd-144 (1)
-
-
yttrium (3)
-
-
titanium (2)
-
vanadium (1)
-
-
nitrogen
-
N-15/N-14 (1)
-
-
noble gases
-
radon (1)
-
-
oxygen
-
O-18/O-16 (19)
-
-
phosphorus (3)
-
silicon (2)
-
sulfur
-
S-34/S-32 (2)
-
-
trace metals (1)
-
-
fossils
-
Chordata
-
Vertebrata
-
Tetrapoda
-
Mammalia
-
Theria
-
Eutheria
-
Primates
-
Hominidae (1)
-
simians
-
Pongidae
-
Proconsul (1)
-
-
-
-
-
-
-
-
-
-
tracks (1)
-
-
geochronology methods
-
Ar/Ar (2)
-
K/Ar (2)
-
tephrochronology (1)
-
Th/U (2)
-
U/Pb (4)
-
uranium disequilibrium (1)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene
-
upper Holocene (1)
-
-
Pleistocene
-
middle Pleistocene (1)
-
-
upper Quaternary (1)
-
-
Tertiary
-
Neogene
-
Miocene
-
lower Miocene (2)
-
-
Pliocene (2)
-
-
Paleogene
-
Oligocene (1)
-
-
-
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous
-
Albian (1)
-
-
Upper Cretaceous (1)
-
-
-
Paleozoic
-
Cambrian
-
Middle Cambrian (1)
-
-
lower Paleozoic (2)
-
Permian
-
Phosphoria Formation (1)
-
-
-
Precambrian
-
Archean
-
Yellowknife Group (1)
-
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic (2)
-
Neoproterozoic (2)
-
Paleoproterozoic (2)
-
-
-
-
-
igneous rocks
-
extrusive rocks (2)
-
igneous rocks
-
carbonatites
-
sovite (4)
-
-
feldspathoid rocks (8)
-
hypabyssal rocks (1)
-
kamafugite (1)
-
kimberlite (7)
-
peperite (1)
-
phoscorites (1)
-
picrite (1)
-
plutonic rocks
-
gabbros
-
alkali gabbros (2)
-
olivine gabbro (1)
-
-
granites
-
A-type granites (2)
-
charnockite (1)
-
-
ijolite (8)
-
lamprophyres
-
camptonite (1)
-
-
monzonites (1)
-
pegmatite (6)
-
sovite (4)
-
syenites
-
albitite (1)
-
alkali syenites (2)
-
nepheline syenite
-
agpaite (1)
-
foyaite (1)
-
lujavrite (1)
-
miaskite (1)
-
-
shonkinite (1)
-
-
ultramafics
-
hornblendite (1)
-
peridotites
-
dunite (1)
-
harzburgite (2)
-
lherzolite (6)
-
-
pyroxenite
-
clinopyroxenite (2)
-
websterite (1)
-
-
-
-
porphyry (1)
-
volcanic rocks
-
basalts
-
alkali basalts
-
mugearite (1)
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trachybasalts (1)
-
-
flood basalts (2)
-
mid-ocean ridge basalts (2)
-
ocean-island basalts (1)
-
-
basanite (2)
-
glasses (4)
-
komatiite (2)
-
leucitite (1)
-
meimechite (1)
-
melilitite (3)
-
nephelinite
-
olivine nephelinite (1)
-
-
phonolites
-
tinguaite (1)
-
-
pyroclastics
-
tuff (5)
-
-
tephrite (1)
-
trachytes (4)
-
-
-
ophiolite (2)
-
volcanic ash (2)
-
wehrlite (3)
-
-
metamorphic rocks
-
metamorphic rocks
-
eclogite (5)
-
gneisses (1)
-
marbles (1)
-
metasedimentary rocks (1)
-
metasomatic rocks
-
fenite (3)
-
-
migmatites
-
anatexite (1)
-
-
-
ophiolite (2)
-
-
meteorites
-
meteorites
-
stony meteorites
-
achondrites (1)
-
chondrites
-
enstatite chondrites
-
EH chondrites
-
Indarch Meteorite (1)
-
-
-
-
-
-
-
minerals
-
alloys
-
carbides
-
cohenite (1)
-
moissanite (2)
-
-
kamacite (1)
-
nitrides (1)
-
phosphides
-
schreibersite (1)
-
-
silicides (1)
-
-
arsenides
-
skutterudite (1)
-
-
carbonates
-
ankerite (2)
-
aragonite (4)
-
azurite (1)
-
bastnaesite (4)
-
calcite (20)
-
dawsonite (1)
-
dolomite (6)
-
magnesite (4)
-
malachite (1)
-
nahcolite (2)
-
parisite (2)
-
shortite (4)
-
siderite (1)
-
synchysite (2)
-
thermonatrite (3)
-
trona (2)
-
vaterite (1)
-
witherite (1)
-
-
halides
-
chlorides
-
eudialyte (1)
-
halite (6)
-
sylvite (6)
-
-
fluorides
-
bastnaesite (4)
-
fluorite (9)
-
neighborite (2)
-
parisite (2)
-
synchysite (2)
-
-
-
minerals (2)
-
molybdates
-
powellite (1)
-
-
native elements
-
carbonado (1)
-
diamond (6)
-
graphite (2)
-
lonsdaleite (1)
-
-
organic minerals (1)
-
oxides
-
baddeleyite (2)
-
brucite (1)
-
chrome spinel (1)
-
corundum (1)
-
ferropericlase (1)
-
ilmenite (1)
-
jacobsite (4)
-
magnesioferrite (3)
-
magnetite (7)
-
niobates
-
loparite (2)
-
pyrochlore (5)
-
-
perovskite (6)
-
rutile (1)
-
spinel (2)
-
spinel group (2)
-
titanium oxides (1)
-
titanomagnetite (2)
-
ulvospinel (2)
-
-
phosphates
-
apatite (19)
-
britholite (2)
-
fluorapatite (4)
-
merrillite (1)
-
monazite (2)
-
whitlockite (1)
-
xenotime (1)
-
-
silicates
-
chain silicates
-
amphibole group
-
clinoamphibole
-
arfvedsonite (1)
-
hastingsite (1)
-
kaersutite (1)
-
riebeckite (2)
-
-
-
pyroxene group
-
clinopyroxene
-
aegirine (5)
-
diopside (2)
-
jadeite (1)
-
-
orthopyroxene
-
enstatite (1)
-
-
-
wollastonite group
-
wollastonite (2)
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
K-feldspar (1)
-
-
plagioclase (1)
-
-
nepheline group
-
kalsilite (1)
-
nepheline (11)
-
-
silica minerals
-
melanophlogite (2)
-
quartz (1)
-
tridymite (1)
-
-
sodalite group
-
sodalite (2)
-
-
zeolite group
-
natrolite (3)
-
-
-
magnesian silicates (1)
-
orthosilicates
-
nesosilicates
-
britholite group
-
britholite (2)
-
-
garnet group
-
andradite (2)
-
hydrogarnet
-
hibschite (1)
-
-
majorite (1)
-
-
olivine group
-
forsterite (2)
-
monticellite (2)
-
olivine (6)
-
wadsleyite (1)
-
-
titanite group
-
titanite (3)
-
-
zircon group
-
zircon (4)
-
-
-
sorosilicates
-
melilite group
-
melilite (2)
-
-
-
-
ring silicates
-
eudialyte (1)
-
milarite group
-
roedderite (1)
-
-
-
sheet silicates
-
chlorite group
-
chlorite (1)
-
clinochlore (1)
-
-
mica group
-
biotite (1)
-
fluor-phlogopite (1)
-
phlogopite (11)
-
-
-
-
sulfates
-
barite (2)
-
-
sulfides
-
alabandite (1)
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1-20 OF 250 RESULTS FOR
natrocarbonatites
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Journal Article
Natrocarbonatites: A hidden product of three-phase immiscibility
Tibor Guzmics, Márta Berkesi, Robert J. Bodnar, András Fall, Enikő Bali, Ralf Milke, Enikő Vetlényi, Csaba Szabó
Journal: Geology
Publisher: Geological Society of America
Published: 15 April 2019
Geology (2019) 47 (6): 527–530.
...Tibor Guzmics; Márta Berkesi; Robert J. Bodnar; András Fall; Enikő Bali; Ralf Milke; Enikő Vetlényi; Csaba Szabó Abstract Earth’s only active natrocarbonatite volcanism, occurring at Oldoinyo Lengai (OL), Tanzania, suggests that natrocarbonatite melts are formed through a unique geological process...
Journal Article
NYEREREITE – PIRSSONITE – CALCITE – SHORTITE RELATIONSHIPS IN ALTERED NATROCARBONATITES, OLDOINYO LENGAI, TANZANIA
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 August 2008
The Canadian Mineralogist (2008) 46 (4): 843–860.
...Anatoly N. Zaitsev; Jörg Keller; John Spratt; Elena N. Perova; Anton Kearsley Abstract Samples of natrocarbonatite showing various degrees of alteration are preserved in an older carbonatite platform that existed before and until the 1917 explosive eruption at Oldoinyo Lengai volcano, in Tanzania...
Journal Article
Carbonatite tuffs and lava clasts of the Tinderet foothills, western Kenya: a study of calcified natrocarbonatites
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 01 May 1984
Journal of the Geological Society (1984) 141 (3): 563–580.
... quenched trachytoidal and flow-banded textures and consist largely (90%) of calcite, plus apatite and magnetite. The principal primary constituent is inferred to have been nyerereite (cf. the natrocarbonatite of Oldoinyo Lengai) now pseudomorphed by calcite, and accompanied by primary tabular calcite...
Journal Article
Kaluwe carbonatite, Zambia: an alternative to natrocarbonatite
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 01 April 1990
Journal of the Geological Society (1990) 147 (2): 213–216.
...B. T. NGWENYA; D. K. BAILEY Abstract Fine grained carbonatite in the Kaluwe complex has been inferred, on textural grounds, to be calcified natrocarbonatite. Electron microprobe analysis, however, shows that the brown laths thought to be pseudo-nyerereite are dolomitic, with Sr values much higher...
Journal Article
Natrocarbonatite tephra of Kerimasi volcano, Tanzania
Journal: Geology
Publisher: Geological Society of America
Published: 01 October 1983
Geology (1983) 11 (10): 599–602.
... of premodern natrocarbonatite volcanism. The principal carbonate mineral was nyerereite, which is the dominant mineral in modern natrocarbonatite lava flows of the adjacent volcano Oldoinyo Lengai. The nyerereite of Kerimasi was leached of its alkalis by meteoric water and is now represented by calcite...
Journal Article
Tinderet volcano, Kenya: an altered natrocarbonatite locality?
Journal: Mineralogical Magazine
Published: 01 April 2013
Mineralogical Magazine (2013) 77 (3): 213–226.
... indicate that the Tinderet carbonatites are similar to natrocarbonatites from the Oldoinyo Lengai and Kerimasi volcanoes that have altered and recrystallized to form calcite carbonatites. These data support the hypothesis that some of the Tinderet carbonatites were originally alkali-rich rocks which...
Journal Article
CALCIOCARBONATITE DYKES AT OLDOINYO LENGAI, TANZANIA: THE FATE OF NATROCARBONATITE
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 August 2006
The Canadian Mineralogist (2006) 44 (4): 857–876.
...Jörg Keller; Anatoly N. Zaitsev Abstract Carbonatite dykes are described for the first time from the active natrocarbonatite volcano Oldoinyo Lengai, Tanzania. The dykes are fine grained, with a microporphyritic texture of polycrystalline, granular calcite microphenocrysts. The porous texture...
Journal Article
Differentiation of natrocarbonatite magma at Oldoinyo Lengai volcano, Tanzania
Journal: Mineralogical Magazine
Published: 01 December 1998
Mineralogical Magazine (1998) 62 (6): 759–768.
...J. Gittins; B. C. Jago Abstract Natrocarbonatite magma, erupted as lava flows in the Tanzanian volcano Oldoinyo Lengai in June and November of 1988, has evolved chemically since its formation. The June and November flows of 1988 display increasing Cl, F, Ba, K, Mg and Mn, concomitantly with Na, Ca...
Journal Article
Rheological properties of natrocarbonatite lavas from Oldoinyo Lengai, Tanzania
Journal: European Journal of Mineralogy
Published: 01 April 1997
European Journal of Mineralogy (1997) 9 (2): 351–364.
Journal Article
The origin of melanophlogite, a clathrate mineral, in natrocarbonatite lava at Oldoinyo Lengai, Tanzania
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 November 2013
American Mineralogist (2013) 98 (11-12): 1998–2006.
...Andrew D. Beard; Kieren Howard; Laura Carmody; Adrian P. Jones Abstract We report new observations of a clathrate mineral, melanophlogite [46SiO 2 ·6(N 2 ,CO 2 )·2(CH 4 ,N 2 )], as part of a tuffaceous layer within a sample of the 2006 natrocarbonatite lava, whose composition reflects the typical...
Journal Article
Mn- and F-bearing rasvumite in natrocarbonatite at Oldoinyo Lengai Volcano, Tanzania
Journal: Mineralogical Magazine
Published: 01 February 1999
Mineralogical Magazine (1999) 63 (1): 53–55.
...B. C. Jago; J. Gittins Several K-Fe sulphide minerals have been described from natrocarbonatite lavas erupted from the Tanzanian volcano Oldoinyo Lengai but uncertainty remains about their exact identity. They do not appear to be any of the established K-Fe sulphides according to Dawson et al...
Journal Article
Dawson's Oldoinyo Lengai calciocarbonatite; a magmatic sovite or an extremely altered natrocarbonatite?
Journal: Mineralogical Magazine
Published: 01 June 1997
Mineralogical Magazine (1997) 61 (3): 351–355.
... natrocarbonatite lava that has been erupted in more recent times. This proposition is difficult to reconcile with the currently fashionable hypothesis whereby the natrocarbonatite lava separated immiscibly from a type of nephelinite magma, most recently thought to be a wollastonite nephelinite. In 1993 Dawson...
Journal Article
Hollow natrocarbonatite lapilli from the 1992 eruption of Oldoinyo Lengai, Tanzania
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 01 February 1994
Journal of the Geological Society (1994) 151 (1): 59–63.
.... & Fallick, A. E. in press. Petrology and geochemistry of Oldoinyo Lengai lavas, extruded November, 1988: Magma source, ascent and crystallisation. In : Bell, K. & Keller, J. (eds) Carbonatite volcanism of Oldoinyo Lengai and petrogenesis of natrocarbonatite. IAVCEI Proceedings in Volcanology...
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WHOLE-ROCK CHEMICAL DATA ON PIRSSONITE AND SHORTITE NATROCARBONATITES, COMP...
in NYEREREITE – PIRSSONITE – CALCITE – SHORTITE RELATIONSHIPS IN ALTERED NATROCARBONATITES, OLDOINYO LENGAI, TANZANIA
> The Canadian Mineralogist
Published: 01 August 2008
TABLE 9. WHOLE-ROCK CHEMICAL DATA ON PIRSSONITE AND SHORTITE NATROCARBONATITES, COMPARED TO CALCITE CARBONATITE AND FRESH NATROCARBONATITE FROM OLDOINYO LENGAI
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Compositions of ferroan alabandite occurring in natrocarbonatites erupted i...
in Niocalite-cuspidine solid solution and manganoan monticellite from natrocarbonatite, Oldoinyo Lengai, Tanzania
> Mineralogical Magazine
Published: 01 October 2004
F ig . 12. Compositions of ferroan alabandite occurring in natrocarbonatites erupted in August 2003 and July 2002 plotted in the ternary Fe-Mn-S system (atomic %). All data this work.
Journal Article
Mineralogy of stalactites formed by subaerial weathering of natrocarbonatite hornitos at Oldoinyo Lengai, Tanzania
Journal: Mineralogical Magazine
Published: 01 August 2006
Mineralogical Magazine (2006) 70 (4): 437–444.
...R. H. Mitchell Abstract Stalactites formed by the chemical weathering of natrocarbonatite lava decorate the roofs of hollow inactive hornitos at Oldoinyo Lengai, Tanzania. The stalactites are composed principally of trona with lesser and very variable amounts of nahcolite, (NaHCO 3 ), thermonatrite...
Journal Article
An ephemeral pentasodium phosphate carbonate from natrocarbonatite lapilli, Oldoinyo Lengai, Tanzania
Journal: Mineralogical Magazine
Published: 01 April 2006
Mineralogical Magazine (2006) 70 (2): 211–218.
...R. H. Mitchell Abstract Lapilli formed by a Strombolian eruption are associated with the formation of a large lava flow of natrocarbonatite on or about 21–22 July, 2000 at Oldoinyo Lengai volcano, Tanzania. Fresh lapilli consist of vesicular natrocarbonatite similar to that occurring in rapidly...
Journal Article
Carbonate-carbonate immiscibility, neighborite and potassium iron sulphide in Oldoinyo Lengai natrocarbonatite
Journal: Mineralogical Magazine
Published: 01 December 1997
Mineralogical Magazine (1997) 61 (6): 779–789.
...Roger H. Mitchell Abstract Porphyritic natrocarbonatite lavas erupted from the Oldoinyo Lengai volcano (Tanzania) on 17 October 1995 and 15-19 December 1995 differ from previously studied lavas in that they preserve textures indicative of groundmass carbonate-carbonate immiscibility. The immiscible...
Journal Article
Sylvite and fluorite microcrysts, and fluorite-nyerereite intergrowths from natrocarbonatite, Oldoinyo Lengai, Tanzania
Journal: Mineralogical Magazine
Published: 01 February 2006
Mineralogical Magazine (2006) 70 (1): 103–114.
...R. H. Mitchell Abstract Natrocarbonatite lavas erupted from hornitos T37B and T49B at Oldoinyo Lengai (Tanzania) during 23–30 July, 2000 are unusual in containing sylvite and fluorite microcrysts together with fluorite-nyerereite intergrowths. The latter are relatively coarse grained and exhibit...
Journal Article
Niocalite-cuspidine solid solution and manganoan monticellite from natrocarbonatite, Oldoinyo Lengai, Tanzania
Journal: Mineralogical Magazine
Published: 01 October 2004
Mineralogical Magazine (2004) 68 (5): 787–799.
...F ig . 12. Compositions of ferroan alabandite occurring in natrocarbonatites erupted in August 2003 and July 2002 plotted in the ternary Fe-Mn-S system (atomic %). All data this work. ...
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