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

合作研究：德干和巴拉那玄武岩碱杂岩的地球化学和年代学研究

• 批准号: 9317214
• 负责人: Asish Basu
• 金额: $ 9.07万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-07-01 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9317214&HistoricalAwards=false
• 关键词: Collaborative; Research; Geochemical; Geochronological; Studies

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.

9317214巴苏这个合作项目是对碱性火成岩进行岩石学、Nd、Sr、Pb同位素、主要和微量元素地球化学研究、3 He/4 He同位素和40 Ar/39 Ar年代学研究，这些火成岩与印度德干和巴西巴拉那的主要溢流玄武岩区有关。 这项研究将建立碱性岩与大量溢流玄武岩火山作用主脉的时间关系。 这项研究还将试图建立留尼汪岛和特里斯坦达库尼亚地幔柱，这通常被认为是负责德干和巴拉那火山活动，分别早期的时间历史。 He、Nd、Sr和Pb同位素数据的建议采集有望表征地幔柱源岩浆。 这项研究的结果也预计将有助于目前的争议，对羽流的影响与羽孵化假说和问题的相对贡献的岩石圈地幔在洪水玄武岩代。