Oxygen isotope geochemistry of the silicic volcanic rocks of the Etendeka-Parana Province; source constraints

Oxygen isotope ratios of pyroxene phenocrysts in the silicic volcanic rocks from the Cretaceous Etendeka-Paraná flood basalt province (Namibia, South America) are believed to reflect the δ18O values of the original magmas. We recognize a high δ18O value type (δ18O pyroxene ∼+10ppm) found in the sout...

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Published in:Geology (Boulder) 1990-11, Vol.18 (11), p.1119-1121
Main Authors: Harris, Chris, Whittingham, Andrew M, Milner, Simon C, Armstrong, Richard A
Format: Article
Language:English
Subjects:
acidic composition
Africa
Atlantic region
basalts
Brazil
Carbon dating
chain silicates
crust
Etendeka Formation
Etendeka-Parana Province
geochemistry
Geology
igneous and metamorphic rocks
igneous rocks
isotopes
lava
magmas
Namibia
O-18/O-16
oxygen
Parana Basin
partial melting
Petrology
phenocrysts
pyroxene group
rhyolites
silicates
South America
Southern Africa
stable isotopes
Stone
volcanic rocks
Volcanoes
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creator Harris, Chris
Whittingham, Andrew M
Milner, Simon C
Armstrong, Richard A
description Oxygen isotope ratios of pyroxene phenocrysts in the silicic volcanic rocks from the Cretaceous Etendeka-Paraná flood basalt province (Namibia, South America) are believed to reflect the δ18O values of the original magmas. We recognize a high δ18O value type (δ18O pyroxene ∼+10ppm) found in the south of both regions, and a low δ18O value type (δ18O pyroxene ∼ +6.5ppm) found in the north. Other differences between these two rhyolite types include higher concentrations of incompatible elements and lower initial 87Sr/86Sr ratios in the low δ18O value type. We suggest that the regional distribution of rhyolite types reflects differences in source composition, which can best be explained if the sources are lower crustal, Late Proterozoic mobile belt material (high δ18O) and Archean lower crust (low δ18O).
doi_str_mv 10.1130/0091-7613(1990)018<1119:OIGOTS>2.3.CO;2
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We recognize a high δ18O value type (δ18O pyroxene ∼+10ppm) found in the south of both regions, and a low δ18O value type (δ18O pyroxene ∼ +6.5ppm) found in the north. Other differences between these two rhyolite types include higher concentrations of incompatible elements and lower initial 87Sr/86Sr ratios in the low δ18O value type. 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We recognize a high δ18O value type (δ18O pyroxene ∼+10ppm) found in the south of both regions, and a low δ18O value type (δ18O pyroxene ∼ +6.5ppm) found in the north. Other differences between these two rhyolite types include higher concentrations of incompatible elements and lower initial 87Sr/86Sr ratios in the low δ18O value type. We suggest that the regional distribution of rhyolite types reflects differences in source composition, which can best be explained if the sources are lower crustal, Late Proterozoic mobile belt material (high δ18O) and Archean lower crust (low δ18O).</abstract><cop>Boulder</cop><pub>Geological Society of America (GSA)</pub><doi>10.1130/0091-7613(1990)018&lt;1119:OIGOTS&gt;2.3.CO;2</doi><tpages>3</tpages></addata></record>
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identifier ISSN: 0091-7613
ispartof Geology (Boulder), 1990-11, Vol.18 (11), p.1119-1121
issn 0091-7613
1943-2682
language eng
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source GeoScienceWorld
subjects acidic composition
Africa
Atlantic region
basalts
Brazil
Carbon dating
chain silicates
crust
Etendeka Formation
Etendeka-Parana Province
geochemistry
Geology
igneous and metamorphic rocks
igneous rocks
isotopes
lava
magmas
Namibia
O-18/O-16
oxygen
Parana Basin
partial melting
Petrology
phenocrysts
pyroxene group
rhyolites
silicates
South America
Southern Africa
stable isotopes
Stone
volcanic rocks
Volcanoes
title Oxygen isotope geochemistry of the silicic volcanic rocks of the Etendeka-Parana Province; source constraints
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