Collaborative Research: Geochemical and Geochronological Studies of Alkalic Complexes of the Deccan and Parana Basalts

9317214 BASU这个合作项目是对碱性火成岩进行岩石学、Nd、Sr、铅同位素、常量元素和微量元素的地球化学研究，3He/4He同位素和40Ar/39Ar年代学研究，这些研究是与印度的德干和巴西的巴拉那的主要泛滥玄武岩省有关的。这项研究将建立碱性岩石与巨量洪泛玄武岩火山活动主脉的时间关系。这项研究还将试图建立留尼汪岛和特里斯滕-达库尼亚地幔热柱的早期时间历史，这两个地幔热柱通常被认为分别是德干火山和巴拉那火山的原因。对氦、钕、锶、铅同位素数据的采集有望表征岩浆的热柱源区。这项研究的结果预计也将有助于目前关于羽流撞击和羽流孕育假说的争论，以及关于岩石圈地幔在洪泛玄武岩形成中的相对贡献的问题。

9317214 Basu This collaborative project is to conduct petrologic, Nd, Sr, Pb-isotopic, major and trace element geochemical studies, 3He/4He isotopic and 40Ar/39Ar geochronologic studies of alkalic igneous rocks, which are found in association with the major flood basalt provinces of Deccan in India and Parana in Brazil. This research will establish the time- relationship of the alkalic rocks with respect to the main pulse of voluminous flood basalt volcanism. This research will also attempt to establish early temporal histories of the Reunion and Tristen da Cunha mantle plumes, which are generally believed to be responsible for Deccan and Parana volcanism, respectively. The proposed acquisition of the isotopic data of He, Nd, Sr and Pb are expected to characterize the plume source-magma. The results of this study are also expected to contribute to current controversies regarding plume-impact versus plume-incubation hypotheses and on questions of the relative contributions of lithospheric mantle in flood basalt generation.