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all geography including DSDP/ODP Sites and Legs
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Africa
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Southern Africa
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Namibia (1)
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Arctic region
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Greenland
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South Greenland (1)
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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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Kuznetsk Alatau (3)
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Altai Russian Federation
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Gorny Altai (1)
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Arabian Peninsula
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Qatar (1)
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Baikal region (1)
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Baikal rift zone (1)
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Buryat Russian Federation (4)
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Central Asia
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Pamirs (1)
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Chuya Alps (1)
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Far East
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Mongolia
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Hangay Mountains (1)
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Indian Peninsula
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Kemerovo Russian Federation (2)
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Sayan
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Siberian fold belt (1)
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Siberian Platform
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Aldan Shield (1)
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Tajikistan (1)
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Transbaikalia (5)
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West Siberia
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Western Transbaikalia (2)
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Zabaykalskiy Russian Federation (2)
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Australasia
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Australia
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New South Wales Australia (1)
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Canada
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Eastern Canada
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Ontario
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Sudbury igneous complex (1)
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Quebec (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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Baikal region (1)
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Baikal rift zone (1)
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Buryat Russian Federation (4)
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Chuya Alps (1)
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Kemerovo Russian Federation (2)
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Kuznetsk Alatau (3)
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Lake Baikal (1)
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Murmansk Russian Federation
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Khibiny Mountains (1)
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Lovozero Massif (1)
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Siberian Platform
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Transbaikalia (5)
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Tajikistan (1)
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West Siberia
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Kuznetsk Alatau (3)
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East Pacific Ocean Islands
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Hawaii
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Kauai County Hawaii
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Europe
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Carpathian Foreland (1)
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Central Europe
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Czech Republic
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Moravia (1)
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Magura Nappe (1)
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Murmansk Russian Federation
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Western Europe
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Islay (1)
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Indian Ocean Islands
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Kerguelen Islands (1)
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North America
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Rocky Mountains
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Oceania
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Kauai County Hawaii
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Kauai (1)
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South America
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Brazil (1)
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United States
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Colorado
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Huerfano County Colorado (1)
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Hawaii
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Kauai County Hawaii
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Kauai (1)
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Montana
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Big Belt Mountains (1)
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U. S. Rocky Mountains
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Big Belt Mountains (1)
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commodities
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elements, isotopes
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hydrogen
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incompatible elements (2)
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large-ion lithophile elements (1)
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alkaline earth metals
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rare earths
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neodymium
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titanium (2)
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oxygen
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geochronology methods
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Tertiary
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upper Mesozoic (1)
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upper Precambrian
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igneous rocks
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kimberlite (1)
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picrite (2)
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norite (1)
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troctolite (1)
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granodiorites (1)
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ijolite (6)
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alkali syenites (4)
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quartz syenite (1)
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shonkinite (1)
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ultramafics
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peridotites
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dunite (1)
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pyroxenite
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clinopyroxenite (2)
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volcanic rocks
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alkali olivine basalt (1)
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trachydolerite (1)
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mid-ocean ridge basalts (2)
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phosphates
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silicates
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chain silicates
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amphibole group
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clinoamphibole
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kaersutite (3)
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pyroxene group
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orthopyroxene (2)
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framework silicates
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barium feldspar
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plagioclase
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nepheline group
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zeolite group
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analcime (1)
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orthosilicates
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nesosilicates
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garnet group (1)
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olivine group
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forsterite (1)
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olivine (5)
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titanite group
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titanite (1)
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zircon group
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zircon (4)
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sheet silicates
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mica group
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biotite (5)
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phlogopite (2)
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sulfates
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barite (1)
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gypsum (1)
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Primary terms
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absolute age (12)
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Africa
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Southern Africa
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Namibia (1)
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Arctic region
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Greenland
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South Greenland (1)
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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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Kuznetsk Alatau (3)
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Mongolian Altai (1)
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Altai Russian Federation
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Gorny Altai (1)
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Arabian Peninsula
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Qatar (1)
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Baikal region (1)
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Baikal rift zone (1)
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Buryat Russian Federation (4)
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Central Asia
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Pamirs (1)
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Chuya Alps (1)
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Far East
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Mongolia
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Hangay Mountains (1)
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Mongolian Altai (1)
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Indian Peninsula
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India
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Deccan Plateau (1)
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Shillong Plateau (2)
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Kemerovo Russian Federation (2)
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Lake Baikal (1)
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Sayan
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Eastern Sayan (1)
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Siberia (1)
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Tajikistan (1)
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Transbaikalia (5)
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West Siberia
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Kuznetsk Alatau (3)
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Western Transbaikalia (2)
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Zabaykalskiy Russian Federation (2)
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Australasia
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Australia
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New South Wales Australia (1)
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Canada
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Eastern Canada
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Ontario
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Sudbury igneous complex (1)
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Quebec (1)
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carbon
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C-13/C-12 (2)
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Cenozoic
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Tertiary
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Neogene (1)
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chemical analysis (1)
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construction materials (1)
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crust (1)
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crystal chemistry (2)
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data processing (1)
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East Pacific Ocean Islands
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Kauai County Hawaii
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Europe
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Western Carpathians (2)
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Central Europe
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Beskid Mountains (1)
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Bohemian Massif (1)
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Czech Republic
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Magura Nappe (1)
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Silesia (2)
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Murmansk Russian Federation
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Lovozero Massif (1)
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Pyrenees (1)
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Southern Europe
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Iberian Peninsula
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Spain (1)
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Western Europe
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France
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Ariege France (1)
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North Pyrenean Fault (1)
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Scandinavia
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Norway
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Vestfold Norway
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Larvik Norway (1)
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-
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United Kingdom
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Great Britain
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England (1)
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Scotland
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Argyllshire Scotland
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Islay (1)
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Ayrshire Scotland (1)
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Hebrides
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Inner Hebrides
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Islay (1)
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faults (2)
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geochemistry (9)
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geophysical methods (1)
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hydrogen
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igneous rocks
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picrite (2)
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plutonic rocks
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diabase
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diorites (1)
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gabbros
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norite (1)
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troctolite (1)
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-
granites
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alkali granites (1)
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aplite (1)
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granodiorites (1)
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ijolite (6)
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lamproite (1)
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lamprophyres (4)
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monzonites (1)
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syenites
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alkali syenites (4)
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nepheline syenite
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foyaite (1)
-
-
quartz syenite (1)
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shonkinite (1)
-
-
ultramafics
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peridotites
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dunite (1)
-
-
pyroxenite
-
clinopyroxenite (2)
-
-
-
-
volcanic rocks
-
basalts
-
alkali basalts
-
alkali olivine basalt (1)
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trachybasalts (2)
-
trachydolerite (1)
-
-
mid-ocean ridge basalts (2)
-
ocean-island basalts (1)
-
shoshonite (1)
-
-
basanite (3)
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latite (1)
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melilitite (1)
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nephelinite (1)
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phonolites (1)
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rhyolites (1)
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trachytes (2)
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inclusions
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fluid inclusions (3)
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Indian Ocean Islands
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intrusions (16)
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isotopes
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Sr-87/Sr-86 (7)
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magmas (11)
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Albian (1)
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Jurassic (1)
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upper Mesozoic (1)
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metal ores
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gold ores (1)
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metals
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actinides
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thorium (1)
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uranium (1)
-
-
alkaline earth metals
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barium (1)
-
strontium
-
Sr-87/Sr-86 (7)
-
-
-
rare earths
-
neodymium
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Nd-144/Nd-143 (4)
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-
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titanium (2)
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zirconium (2)
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-
metamorphic rocks
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marbles (1)
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metavolcanic rocks (1)
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quartzites (1)
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metasomatism (3)
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minerals (1)
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North America
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Rocky Mountains
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U. S. Rocky Mountains
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Big Belt Mountains (1)
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Sangre de Cristo Mountains (1)
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Spanish Peaks (1)
-
-
-
-
Oceania
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Polynesia
-
Hawaii
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Kauai County Hawaii
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Kauai (1)
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-
oxygen
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O-18/O-16 (4)
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paleogeography (1)
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Paleozoic
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Cambrian
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lower Paleozoic (2)
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Precambrian
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upper Precambrian
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rock mechanics (1)
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Hawaii
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sedimentary rocks
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sedimentary rocks
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carbonate rocks
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clastic rocks
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graywacke (1)
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sediments
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sediments
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clastic sediments
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GeoRef Categories
Era and Period
Epoch and Age
Date
Availability
alkali gabbros
Interaction of seawater with (ultra)mafic alkaline rocks—Alternative process for the formation of aegirine Available to Purchase
Wadi gravel – a new concrete aggregate in Qatar: Part 2 –Alkali aggregate reactivity Available to Purchase
Fluorcaphite from hydrothermally altered teschenite at Tichá, Outer Western Carpathians, Czech Republic: compositional variations and origin Available to Purchase
Conditions of crystallization of olivine shonkinites in the Inagli massif (Central Aldan) Available to Purchase
Occurrences of Slawsonite in Rocks of the Teschenite Association in the PodbeskydÍ Piedmont Area (czech Republic) and Their Petrological Significance Available to Purchase
Geochemistry, isotope triad (Nd–Sr–O), and 40 Ar– 39 Ar age of Paleozoic alkaline mafic intrusions of the Kuznetsk Alatau (by the example of the Belaya Gora pluton) Available to Purchase
Compositional variation of apatite from rift-related alkaline igneous rocks of the Gardar Province, South Greenland Available to Purchase
Sources and geodynamic setting of petrogenesis of the Middle Cambrian Upper Petropavlovka alkaline basic pluton ( Kuznetsk Alatau , Siberia ) Available to Purchase
Isotope (U–Pb, Sm–Nd, Rb–Sr) geochronology of alkaline basic plutons of the Kuznetsk Alatau Available to Purchase
Mineralogy and magmatic affinity of the Jasra intrusive complex, Shillong Plateau, India Available to Purchase
The alkaline and carbonatitic rocks of Gorny Altai ( Edel’veis complex ) as indicators of Early Paleozoic plume magmatism in the Central Asian Fold Belt Available to Purchase
The age of carbonatites and mafic rocks (SHRIMP II and Rb-Sr dating) from the Oshurkovo apatite-bearing pluton ( western Transbaikalia ) Available to Purchase
Age of picrite and picrodolerite magmatism in western Mongolia Available to Purchase
Sequence of magmatic events in the Late Paleozoic of Transbaikalia, Russia (U-Pb isotope data) Available to Purchase
Evolution of nepheline from mafic to highly differentiated members of the alkaline series: the Messum complex, Namibia Available to Purchase
Carbonatites in collisional settings and pseudo-carbonatites of the Early Paleozoic Ol’khon collisional system Available to Purchase
Zr- AND Ba-RICH MINERALS FROM THE PONTE NOVA ALKALINE MAFIC-ULTRAMAFIC MASSIF, SOUTHEASTERN BRAZIL: INDICATION OF AN ENRICHED MANTLE SOURCE Available to Purchase
PARAGENETIC TYPES OF CARBONATITE AS INDICATED BY THE DIVERSITY AND RELATIVE ABUNDANCES OF ASSOCIATED SILICATE ROCKS: EVIDENCE FROM A GLOBAL DATABASE Available to Purchase
Alkaline gabbroids of the Chirii outcrop (North Minusa depression): mineralogy and melt evolution Available to Purchase
Nd and Sr isotope systematics and geochemistry of a plume-related Early Cretaceous alkaline-mafic-ultramafic igneous complex from Jasra, Shillong plateau, northeastern India Available to Purchase
This article describes an Early Cretaceous Jasra alkaline-mafic-ultramafic igneous complex related to the Kerguelen hotspot–mantle plume system of the Indian Ocean. This complex, emplaced in the Shillong plateau, consists mainly of pyroxenite, gabbro, and nepheline syenite and is closely associated with the Barapani-Tyrsad shear zone, Kopali faults, and Um Ngot Lineaments. Pyroxenite and gabbro occur as separate plutons, whereas nepheline syenites occur either in the form of small dikes in pyroxenites or as differentiated bodies in the gabbros. A few mafic dikes, contemporaneous with gabbro, cut pyroxenite and granite bodies. Mineral compositions classify the pyroxenites into pyroxenite and alkali pyroxenite and the gabbros into essexite and olivine gabbro. The chemical and normative compositions of mafic-ultramafic rocks also show their alkaline nature. Nepheline syenite samples are miaskitic in character (agpaitic index < 1),suggesting the involvement of a CO 2 -related phase in their genesis. Chemical data do not support any simple genetic relationship between the different rock units of the complex. Field data also support this conclusion and suggest that these rock units have different genetic histories. Major-element-based discrimination function diagrams suggest the ocean island basalt (OIB) affinity of the Jasra samples. The OIB nature of these samples is further corroborated by their radiogenic isotopic compositions. Sr and Nd isotopic compositions ( 87 Sr/ 86 Sr initial between 0.706523 and 0.708891 and 143 Nd/ 144 Nd initial between 0.512258 and 0.512464) suggest that these rocks were derived from a mixing of mantle components such as HIMU (mantle with a high U/Pb ratio) and EM (enriched mantle) components, which show an isotopic composition similar to FOZO (focal zone) composition. Lherzolite mantle was metasomatized into an alkaline wehrlite by CO 2 , released by low-degree melting of a carbonated mantle peridotite. Melting of such a metasomatized mantle source may produce ultrabasic alkaline silicate magma, from which the different rock units of the Jasra Complex were crystallized. The geological, geochemical, geochronological, and isotopic data also suggest a spatial and temporal association with the Kerguelen plume activity.