气候变化领域集成服务门户(CCPortal): Geochronology of the Paraná-Etendeka large igneous province

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DOI	10.1016/j.earscirev.2021.103716
	Geochronology of the Paraná-Etendeka large igneous province
	Gomes A.S.; Vasconcelos P.M.
发表日期	2021
ISSN	00128252
卷号	220
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
关键词	40Ar/39Ar geochronology Early Cretaceous Large igneous provinces Paraná-Etendeka large igneous province U/Pb geochronology Weissert event
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/204036
作者单位	School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD 4071, Australia
推荐引用方式 GB/T 7714	Gomes A.S.,Vasconcelos P.M.. Geochronology of the Paraná-Etendeka large igneous province[J],2021,220.
APA	Gomes A.S.,&Vasconcelos P.M..(2021).Geochronology of the Paraná-Etendeka large igneous province.Earth Science Reviews,220.
MLA	Gomes A.S.,et al."Geochronology of the Paraná-Etendeka large igneous province".Earth Science Reviews 220(2021).