| DOI: | 10.1016/j.earscirev.2021.103716
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| 论文题名: | Geochronology of the Paraná-Etendeka large igneous province |
| 作者: | Gomes A.S.; Vasconcelos P.M.
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| 刊名: | Earth Science Reviews
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| ISSN: | 00128252
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| 出版年: | 2021
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| 卷: | 220 | | 语种: | 英语
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| 中文关键词: | 40Ar/39Ar geochronology
; Early Cretaceous
; Large igneous provinces
; Paraná-Etendeka large igneous province
; U/Pb geochronology
; Weissert event
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| 英文摘要: | Constraining the timing of emplacement, duration and magma extrusion rates of large igneous provinces is essential for evaluating their petrogenetic evolution and possible links to environmental changes that cause mass extinctions. The Paraná-Etendeka continental flood basalts correspond to a voluminous and purportedly short magmatic event that erupted during the Early Cretaceous in southwestern Gondwana, predating its breakup. During this event, large amounts of mafic and felsic lavas and associated products (volcaniclastic rocks, dykes, sills and intrusive complexes) were formed. A compilation of the existing published 40Ar/39Ar step-heating (n = 378) and U/Pb (n = 32) ages, followed by the recalculation and filtering of the 40Ar/39Ar step-heating data, places the initial eruptive stages at 135.0 ± 0.6 Ma, with the extrusion of the Tafelkop low-Ti mafic magmas. Volcanic activity peaked at 134.4 ± 0.1 Ma with the ongoing emplacement of low-Ti magmas and with the onset of high-Ti mafic and silicic volcanism in the north, with major events lasting until 133.2 ± 0.3 Ma and eruptions possibly ceasing at 132.0 ± 0.2 Ma. Igneous activity, mostly in the form of dykes, apparently persisted for an additional 10 million years after the breakup of Gondwana and the subsequent initial drifting stages of the South Atlantic basin. The compiled and recalculated results confirm the brevity (1.6–3.0 m.y.) of the main phase of the Paraná-Etendeka volcanism. They also suggest a possible temporal link between the Paraná-Etendeka magmatism and the Weissert event δ13C excursion. © 2021 |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/166405
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| Appears in Collections: | 气候变化与战略
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作者单位: | School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD 4071, Australia
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| Recommended Citation: | |
Gomes A.S.,Vasconcelos P.M.. Geochronology of the Paraná-Etendeka large igneous province[J]. Earth Science Reviews,2021-01-01,220
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