globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116123
论文题名:
Geochemistry of Etendeka magmatism: Spatial heterogeneity in the Tristan-Gough plume head
作者: Zhou H.; Hoernle K.; Geldmacher J.; Hauff F.; Homrighausen S.; Garbe-Schönberg D.; Jung S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 535
语种: 英语
中文关键词: Etendeka flood basalts ; Gough ; Large Igneous Province (LIP) ; Namibia ; plume zonation ; Sr-Nd-Pb-Hf isotope ratios
英文关键词: Basalt ; Floods ; Geochemistry ; Hafnium alloys ; Isotopes ; Levees ; Neodymium alloys ; Strontium alloys ; Trace elements ; Flood basalt ; Gough ; Large igneous provinces ; Namibia ; plume zonation ; Sr-Nd-Pb-Hf isotopes ; Lead alloys ; flood basalt ; hafnium ; hot spot ; igneous geochemistry ; large igneous province ; lava flow ; lead isotope ; magmatism ; neodymium isotope ; strontium isotope ; Namibia
英文摘要: The origin and distribution of geochemically distinct source components in continental flood volcanism (generally associated with the initial phase of a mantle plume head) are poorly understood. Here we present new geochemical (major and trace element and Sr-Nd-Pb-Hf isotope) data from the Etendeka flood basalts and associated dikes from northern and central Namibia that are believed to have been produced during the initial stage of the Tristan-Gough hotspot. Following earlier studies, the Etendeka lava flows and dikes are divided into high-Ti and low-Ti groups. The trace element and isotopic composition of the high-Ti tholeiitic basalts, exclusively outcropping in northern Etendeka (northwestern Namibia), are similar to the Gough-type enriched mantle I (EMI) composition found on the Walvis Ridge (the Atlantic type locality for the EMI end member). The low-Ti tholeiitic basalts, primarily outcropping in Southern Etendeka (central western Namibia), have higher 143Nd/144Nd and 207Pb/204Pb but lower 208Pb/204Pb ratios than the Gough composition. Combining our data with newly published 3He/4He data and estimates of the magma source's potential temperature from 1520-1680°C, we conclude that the source of the low-Ti basalts was also intrinsic to the Tristan-Gough plume, consistent with a spatially-zoned plume head. The low-Ti basalts were derived from a distinct EMI-type source component that has thus far only been detected in the initial Tristan-Gough plume head (∼132 Ma), but not the later submarine hotspot track. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165387
Appears in Collections:气候变化与战略

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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, 24148, Germany; Institute of Geosciences, Kiel University, Ludewig-Meyn-Str. 10, Kiel, 24118, Germany; Institute of Mineralogy and Petrography, Universität Hamburg, Grindelallee 48, Hamburg, 20146, Germany

Recommended Citation:
Zhou H.,Hoernle K.,Geldmacher J.,et al. Geochemistry of Etendeka magmatism: Spatial heterogeneity in the Tristan-Gough plume head[J]. Earth and Planetary Science Letters,2020-01-01,535
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