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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
East Africa
-
Malawi (1)
-
-
North Africa
-
Algeria (1)
-
Morocco (1)
-
-
West African Craton (1)
-
West African Shield (1)
-
-
Asia
-
Krasnoyarsk Russian Federation
-
Igarka Russian Federation (1)
-
Taymyr Dolgan-Nenets Russian Federation
-
Norilsk region (1)
-
-
-
Lena River (1)
-
Siberia (1)
-
Siberian Platform (1)
-
Yakutia Russian Federation
-
Yakutsk Russian Federation (1)
-
-
-
Atlantic Ocean
-
North Atlantic
-
Northeast Atlantic (1)
-
-
-
Atlantic Ocean Islands
-
Azores (1)
-
-
Canada
-
Eastern Canada
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Maritime Provinces
-
Nova Scotia (1)
-
-
-
-
Commonwealth of Independent States
-
Russian Federation
-
Krasnoyarsk Russian Federation
-
Igarka Russian Federation (1)
-
Taymyr Dolgan-Nenets Russian Federation
-
Norilsk region (1)
-
-
-
Lena River (1)
-
Siberian Platform (1)
-
Yakutia Russian Federation
-
Yakutsk Russian Federation (1)
-
-
-
-
Europe
-
Alps (1)
-
Central Europe
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Austria (1)
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Switzerland
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Bern Switzerland
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Grimsel Test Site (1)
-
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-
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Pyrenees (1)
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Southern Europe
-
Iberian Peninsula
-
Central Iberian Zone (5)
-
Duero Basin (1)
-
Iberian Massif (15)
-
Iberian pyrite belt (6)
-
Ossa-Morena Zone (11)
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Portugal
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Alentejo (1)
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Algarve (2)
-
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Spain
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Andalusia Spain
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Cordoba Spain (1)
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Huelva Spain (1)
-
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Betic Cordillera (1)
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Cantabrian Mountains (2)
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Castilla y Leon Spain
-
Salamanca Spain (1)
-
-
Castilla-La Mancha Spain
-
Guadalajara Spain (1)
-
-
Extremadura Spain
-
Badajoz Spain (2)
-
-
Galicia Spain
-
La Coruna Spain (1)
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Lugo Spain (1)
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Ordenes Complex (1)
-
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Iberian Mountains (1)
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Madrid Spain (1)
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Sierra de Guadarrama (1)
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Sierra Morena (1)
-
-
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Italy
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Lombardy Italy (1)
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Sardinia Italy (1)
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-
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Variscides (11)
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Western Europe
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France
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Armorican Massif (2)
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Lusitanian Basin (2)
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commodities
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coal deposits (1)
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construction materials
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building stone (1)
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metal ores
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chromite ores (1)
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copper ores (4)
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lead ores (1)
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nickel ores (3)
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platinum ores (2)
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polymetallic ores (2)
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tin ores (1)
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uranium ores (1)
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zinc ores (2)
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mineral deposits, genesis (5)
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mineral exploration (5)
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ornamental materials (1)
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elements, isotopes
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chemical ratios (2)
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isotope ratios (6)
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isotopes
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radioactive isotopes (1)
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stable isotopes
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Nd-144/Nd-143 (1)
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O-18/O-16 (1)
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Pb-207/Pb-206 (1)
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Pb-208/Pb-206 (1)
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Sr-87/Sr-86 (4)
-
-
-
Lu/Hf (3)
-
metals
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actinides
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uranium (1)
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-
alkali metals
-
potassium (1)
-
-
alkaline earth metals
-
strontium
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Sr-87/Sr-86 (4)
-
-
-
indium (1)
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lead
-
Pb-207/Pb-206 (1)
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Pb-208/Pb-206 (1)
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platinum group
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iridium (1)
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osmium (1)
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palladium (1)
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platinum (1)
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platinum ores (2)
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ruthenium (1)
-
-
rare earths
-
cerium (1)
-
lanthanum (1)
-
lutetium (1)
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
-
oxygen
-
O-18/O-16 (1)
-
-
selenium (1)
-
-
fossils
-
Invertebrata
-
Bryozoa (1)
-
-
microfossils (1)
-
palynomorphs
-
miospores (1)
-
-
-
geochronology methods
-
Lu/Hf (3)
-
Nd/Nd (1)
-
paleomagnetism (1)
-
Pb/Pb (2)
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Rb/Sr (1)
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Sm/Nd (1)
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Sr/Sr (1)
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thermochronology (1)
-
U/Pb (24)
-
-
geologic age
-
Cenozoic
-
Quaternary
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Holocene
-
upper Holocene
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Roman period (1)
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-
-
-
Tertiary (1)
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Mesozoic
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Triassic (3)
-
-
Paleozoic
-
Cambrian
-
Lower Cambrian
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Terreneuvian (1)
-
-
Upper Cambrian
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Furongian (1)
-
-
-
Carboniferous
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Culm (1)
-
Lower Carboniferous (2)
-
Mississippian
-
Lower Mississippian
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Tournaisian
-
upper Tournaisian (1)
-
-
-
Middle Mississippian
-
Visean
-
upper Visean (1)
-
-
-
Upper Mississippian
-
Serpukhovian (1)
-
-
-
Namurian (1)
-
Pennsylvanian
-
Lower Pennsylvanian
-
Bashkirian (1)
-
-
Middle Pennsylvanian
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Moscovian (1)
-
-
-
Upper Carboniferous (2)
-
-
Devonian
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Lower Devonian
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Lochkovian (1)
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-
Middle Devonian
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Givetian (1)
-
-
Upper Devonian
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Famennian
-
upper Famennian (2)
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-
-
-
lower Paleozoic (3)
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Ordovician
-
Lower Ordovician (2)
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Permian (1)
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Silurian (1)
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upper Paleozoic (1)
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-
Precambrian
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Archean (1)
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upper Precambrian
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Proterozoic
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Mesoproterozoic (1)
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Neoproterozoic
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Ediacaran (3)
-
Vendian (1)
-
-
Paleoproterozoic
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Birimian (1)
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-
-
-
-
-
igneous rocks
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igneous rocks
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carbonatites (1)
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plutonic rocks
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diorites
-
microdiorite (1)
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quartz diorites (1)
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-
gabbros (2)
-
granites
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alkali granites (1)
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leucogranite (1)
-
S-type granites (1)
-
-
granodiorites (2)
-
pegmatite (1)
-
syenites
-
alkali syenites (1)
-
-
ultramafics
-
chromitite (2)
-
peridotites
-
dunite (2)
-
harzburgite (1)
-
-
pyroxenite
-
clinopyroxenite (1)
-
-
-
-
volcanic rocks
-
basalts
-
alkali basalts (1)
-
flood basalts (1)
-
mid-ocean ridge basalts (1)
-
-
pyroclastics
-
tuff (1)
-
-
rhyodacites (1)
-
trachyandesites (1)
-
-
-
-
metamorphic rocks
-
metamorphic rocks
-
amphibolites (1)
-
gneisses
-
orthogneiss (1)
-
-
marbles (1)
-
metaigneous rocks
-
metabasite (1)
-
metagranite (1)
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serpentinite (1)
-
-
metasedimentary rocks
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metapelite (2)
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-
metasomatic rocks
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fenite (1)
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serpentinite (1)
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-
metavolcanic rocks (1)
-
migmatites (4)
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mylonites (1)
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quartzites (1)
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-
turbidite (2)
-
-
minerals
-
arsenides
-
sperrylite (1)
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bismuthides
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michenerite (1)
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oxides
-
chromite (1)
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magnetite (1)
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pitchblende (1)
-
-
phosphates
-
monazite (2)
-
-
platinum minerals (1)
-
silicates
-
chain silicates
-
amphibole group
-
clinoamphibole
-
pargasite (1)
-
tremolite (1)
-
-
-
pyroxene group
-
clinopyroxene (1)
-
-
-
framework silicates
-
silica minerals
-
chalcedony (1)
-
-
-
orthosilicates
-
nesosilicates
-
garnet group
-
grossular (1)
-
-
olivine group
-
olivine (1)
-
-
zircon group
-
zircon (22)
-
-
-
sorosilicates
-
epidote group
-
epidote (1)
-
-
-
-
sheet silicates
-
clay minerals
-
kaolinite (2)
-
smectite (1)
-
-
illite (1)
-
palygorskite (1)
-
-
-
sulfides
-
chalcopyrite (2)
-
copper sulfides (1)
-
iron sulfides (1)
-
millerite (1)
-
nickel sulfides (1)
-
pyrite (2)
-
pyrrhotite (1)
-
sphalerite (1)
-
-
tellurides (1)
-
-
Primary terms
-
absolute age (25)
-
Africa
-
East Africa
-
Malawi (1)
-
-
North Africa
-
Algeria (1)
-
Morocco (1)
-
-
West African Craton (1)
-
West African Shield (1)
-
-
Asia
-
Krasnoyarsk Russian Federation
-
Igarka Russian Federation (1)
-
Taymyr Dolgan-Nenets Russian Federation
-
Norilsk region (1)
-
-
-
Lena River (1)
-
Siberia (1)
-
Siberian Platform (1)
-
Yakutia Russian Federation
-
Yakutsk Russian Federation (1)
-
-
-
Atlantic Ocean
-
North Atlantic
-
Northeast Atlantic (1)
-
-
-
Atlantic Ocean Islands
-
Azores (1)
-
-
biogeography (1)
-
Canada
-
Eastern Canada
-
Maritime Provinces
-
Nova Scotia (1)
-
-
-
-
catalogs (1)
-
Cenozoic
-
Quaternary
-
Holocene
-
upper Holocene
-
Roman period (1)
-
-
-
-
Tertiary (1)
-
-
clay mineralogy (1)
-
coal deposits (1)
-
construction materials
-
building stone (1)
-
-
crust (12)
-
data processing (1)
-
deformation (7)
-
earthquakes (3)
-
Europe
-
Alps (1)
-
Central Europe
-
Austria (1)
-
Switzerland
-
Bern Switzerland
-
Grimsel Test Site (1)
-
-
-
-
Pyrenees (1)
-
Southern Europe
-
Iberian Peninsula
-
Central Iberian Zone (5)
-
Duero Basin (1)
-
Iberian Massif (15)
-
Iberian pyrite belt (6)
-
Ossa-Morena Zone (11)
-
Portugal
-
Alentejo (1)
-
Algarve (2)
-
-
Spain
-
Andalusia Spain
-
Cordoba Spain (1)
-
Huelva Spain (1)
-
-
Betic Cordillera (1)
-
Cantabrian Mountains (2)
-
Castilla y Leon Spain
-
Salamanca Spain (1)
-
-
Castilla-La Mancha Spain
-
Guadalajara Spain (1)
-
-
Extremadura Spain
-
Badajoz Spain (2)
-
-
Galicia Spain
-
La Coruna Spain (1)
-
Lugo Spain (1)
-
Ordenes Complex (1)
-
-
Iberian Mountains (1)
-
Madrid Spain (1)
-
Sierra de Guadarrama (1)
-
Sierra Morena (1)
-
-
-
Italy
-
Lombardy Italy (1)
-
Sardinia Italy (1)
-
-
-
Variscides (11)
-
Western Europe
-
France
-
Armorican Massif (2)
-
-
-
-
faults (13)
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folds (1)
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foliation (1)
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fractures (1)
-
geochemistry (6)
-
geochronology (1)
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geophysical methods (1)
-
ground water (1)
-
heat flow (3)
-
igneous rocks
-
carbonatites (1)
-
plutonic rocks
-
diorites
-
microdiorite (1)
-
quartz diorites (1)
-
-
gabbros (2)
-
granites
-
alkali granites (1)
-
leucogranite (1)
-
S-type granites (1)
-
-
granodiorites (2)
-
pegmatite (1)
-
syenites
-
alkali syenites (1)
-
-
ultramafics
-
chromitite (2)
-
peridotites
-
dunite (2)
-
harzburgite (1)
-
-
pyroxenite
-
clinopyroxenite (1)
-
-
-
-
volcanic rocks
-
basalts
-
alkali basalts (1)
-
flood basalts (1)
-
mid-ocean ridge basalts (1)
-
-
pyroclastics
-
tuff (1)
-
-
rhyodacites (1)
-
trachyandesites (1)
-
-
-
inclusions (1)
-
intrusions (10)
-
Invertebrata
-
Bryozoa (1)
-
-
isotopes
-
radioactive isotopes (1)
-
stable isotopes
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (1)
-
Pb-207/Pb-206 (1)
-
Pb-208/Pb-206 (1)
-
Sr-87/Sr-86 (4)
-
-
-
lava (1)
-
magmas (3)
-
mantle (4)
-
Mesozoic
-
Triassic (3)
-
-
metal ores
-
chromite ores (1)
-
copper ores (4)
-
lead ores (1)
-
nickel ores (3)
-
platinum ores (2)
-
polymetallic ores (2)
-
tin ores (1)
-
uranium ores (1)
-
zinc ores (2)
-
-
metals
-
actinides
-
uranium (1)
-
-
alkali metals
-
potassium (1)
-
-
alkaline earth metals
-
strontium
-
Sr-87/Sr-86 (4)
-
-
-
indium (1)
-
lead
-
Pb-207/Pb-206 (1)
-
Pb-208/Pb-206 (1)
-
-
platinum group
-
iridium (1)
-
osmium (1)
-
palladium (1)
-
platinum (1)
-
platinum ores (2)
-
ruthenium (1)
-
-
rare earths
-
cerium (1)
-
lanthanum (1)
-
lutetium (1)
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
-
metamorphic rocks
-
amphibolites (1)
-
gneisses
-
orthogneiss (1)
-
-
marbles (1)
-
metaigneous rocks
-
metabasite (1)
-
metagranite (1)
-
serpentinite (1)
-
-
metasedimentary rocks
-
metapelite (2)
-
-
metasomatic rocks
-
fenite (1)
-
serpentinite (1)
-
-
metavolcanic rocks (1)
-
migmatites (4)
-
mylonites (1)
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quartzites (1)
-
-
metamorphism (12)
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metasomatism (6)
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mineral deposits, genesis (5)
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mineral exploration (5)
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Mohorovicic discontinuity (1)
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orogeny (22)
-
oxygen
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O-18/O-16 (1)
-
-
paleogeography (8)
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paleomagnetism (1)
-
Paleozoic
-
Cambrian
-
Lower Cambrian
-
Terreneuvian (1)
-
-
Upper Cambrian
-
Furongian (1)
-
-
-
Carboniferous
-
Culm (1)
-
Lower Carboniferous (2)
-
Mississippian
-
Lower Mississippian
-
Tournaisian
-
upper Tournaisian (1)
-
-
-
Middle Mississippian
-
Visean
-
upper Visean (1)
-
-
-
Upper Mississippian
-
Serpukhovian (1)
-
-
-
Namurian (1)
-
Pennsylvanian
-
Lower Pennsylvanian
-
Bashkirian (1)
-
-
Middle Pennsylvanian
-
Moscovian (1)
-
-
-
Upper Carboniferous (2)
-
-
Devonian
-
Lower Devonian
-
Lochkovian (1)
-
-
Middle Devonian
-
Givetian (1)
-
-
Upper Devonian
-
Famennian
-
upper Famennian (2)
-
-
-
-
lower Paleozoic (3)
-
Ordovician
-
Lower Ordovician (2)
-
-
Permian (1)
-
Silurian (1)
-
upper Paleozoic (1)
-
-
palynomorphs
-
miospores (1)
-
-
paragenesis (1)
-
petrology (1)
-
plate tectonics (12)
-
pollution (1)
-
Precambrian
-
Archean (1)
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic (1)
-
Neoproterozoic
-
Ediacaran (3)
-
Vendian (1)
-
-
Paleoproterozoic
-
Birimian (1)
-
-
-
-
-
sedimentary rocks
-
clastic rocks
-
black shale (1)
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claystone (1)
-
graywacke (3)
-
sandstone (1)
-
shale (1)
-
siltstone (1)
-
-
coal
-
anthracite (1)
-
-
-
sedimentary structures
-
soft sediment deformation
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olistostromes (1)
-
-
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sedimentation (4)
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selenium (1)
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spectroscopy (1)
-
structural analysis (3)
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tectonics (21)
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waste disposal (1)
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weathering (1)
-
-
sedimentary rocks
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flysch (5)
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sedimentary rocks
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clastic rocks
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black shale (1)
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claystone (1)
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graywacke (3)
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sandstone (1)
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shale (1)
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siltstone (1)
-
-
coal
-
anthracite (1)
-
-
-
siliciclastics (1)
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turbidite (2)
-
volcaniclastics (2)
-
-
sedimentary structures
-
sedimentary structures
-
soft sediment deformation
-
olistostromes (1)
-
-
-
-
sediments
-
siliciclastics (1)
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turbidite (2)
-
volcaniclastics (2)
-
Evora Massif
Variscan intracrustal recycling by melting of Carboniferous arc-like igneous protoliths (Évora Massif, Iberian Variscan belt)
Abstract Following a Middle–Late Devonian ( c . 390–360 Ma) phase of crustal shortening and mountain building, continental extension and onset of high-medium-grade metamorphic terrains occurred in the SW Iberian Massif during the Visean ( c . 345–326 Ma). The Évora–Aracena–Lora del Rı́o metamorphic belt extends along the Ossa–Morena Zone southern margin from south Portugal through the south of Spain, a distance of 250 km. This major structural domain is characterized by local development of high-temperature–low-pressure metamorphism ( c . 345–335 Ma) that reached high amphibolite to granulite facies. These high-medium-grade metamorphic terrains consist of strongly sheared Ediacaran and Cambrian–early Ordovician ( c . 600–480 Ma) protoliths. The dominant structure is a widespread steeply-dipping foliation with a gently-plunging stretching lineation generally oriented parallel to the fold axes. Despite of the wrench nature of this collisional orogen, kinematic indicators of left-lateral shearing are locally compatible with an oblique component of extension. These extensional transcurrent movements associated with pervasive mylonitic foliation ( c . 345–335 Ma) explain the exhumation of scarce occurrences of eclogites ( c . 370 Ma). Mafic-intermediate plutonic and hypabyssal rocks ( c . 355–320 Ma), mainly I-type high-K calc-alkaline diorites, tonalites, granodiorites, gabbros and peraluminous biotite granites, are associated with these metamorphic terrains. Volcanic rocks of the same chemical composition and age are preserved in Tournaisian–Visean ( c . 350–335 Ma) marine basins dominated by detrital sequences with local development of syn-sedimentary gravitational collapse structures. This study, supported by new U–Pb zircon dating, demonstrates the importance of intra-orogenic transtension in the Gondwana margin during the Early Carboniferous when the Rheic ocean between Laurussia and Gondwana closed, forming the Appalachian and Variscan mountains.
GAP COMPOSITION (wt%) OF MAGMATISM FROM THE ÉVORA MASSIF, PORTUGAL
Map of the Évora Massif with location of the study areas (1, Almansor area,...
Schematic cross-section of part of the Évora Massif (see Fig.1 for locati...
Model of D 2 wrenching in the Évora Massif with the transtensional Boa Fé ...
Abstract Sensitive high-resolution ion microprobe U–Th–Pb age determinations on detrital and inherited zircon from the Évora Massif (SW Iberian Massif, Portugal) provide direct evidence for the provenance of the Ossa–Morena Ediacaran basins (Série Negra) and a palaeogeographical link with the West African craton. Three samples of the Série Negra paragneisses contain large components of Cryogenian and Ediacaran ( c . 700–540 Ma) detrital zircon, but have a marked lack of zircon of Mesoproterozoic ( c . 1.8–0.9 Ga) age. Older inherited zircons are of Palaeoproterozoic ( c . 2.4–1.8 Ga) and Archaean ( c . 3.5–2.5 Ga) age. The same age pattern is also found in the Arraiolos biotite granite, which was formed by partial melting of the Série Negra and overlying Cambrian rocks. These results are consistent with substantial denudation of a continental region that supplied sediments to the Ediacaran Ossa–Morena basins during the final stages of the Cadomian–Avalonian orogeny (peri-Gondwanan margin with principal zircon-forming events at c . 575 Ma and c . 615 Ma). Combined with the detrital zircon ages reported for rocks of the same age from Portugal, Spain, Germany and Algeria, our data suggest that the sediment supply to the Ediacaran–Early Palaeozoic siliciclastic sequences preserved in all these peri-Gondwanan regions was similar. The lack of Grenvillian-aged ( c . 1.1–0.9 Ga) zircon in the Ossa–Morena and Saxo-Thuringia Ediacaran sediments suggests that the sediment in these peri-Gondwanan basins was derived from the West African craton.