西北地质Issue(2)：1-26,26.
亚洲3个大火成岩省(峨眉山、西伯利亚、德干)对比研究
Comparison of Three Large Igneous Provinces (Emeishan,Siberia,Deccan) in Asia
摘要
Abstract
The Emeishan (~260 Ma), Siberian (～250 Ma) and Deccan (～66 Ma) continental flood basalts are three important Phanerozoic large igneous provinces in the word. Our summation reveals that at least four criteria, which are normally used to identify ancient mantle plumes, are met for these three large igneous provinces: (1) surface uplift prior to magmatism; (2) Accompanied with continental rifting and breakup events; (3) Closely linked with the extinction events; (4) chemical characteristics of plume de-rived basalts. Although these three large igneous provinces are equally derived from primitive plume sources, there are fundamental differences in geochemical signatures among Emeishan, Siberian and Dec-can provinces, reflecting the interaction between the mantle plumes and different upper-mantle reservoirs: (1) the parental magmas of the Emeishan and Siberian continental flood basalts have undergone, during ascent, interaction with a source geochemically identical to ancient cratonic lithospheric mantle (EMl-type source) (2) whereas the crustally (or lithosphericly) uncontaminated primitive basalts from the Deccan province display Sr-Nd isotopic variations between plume and EM2 geochemical signatures. These differences may control the mineralization potential of the three large igneous provinces. Emeishan and Siberian provinces host world-class magmatic ore deposits whereas no significant deposits have been found from the Deccan.关键词
大火成岩省/大陆溢流玄武岩/地幔柱/峨眉山大火成岩省/西伯利亚大火成岩省/德干大火成岩省Key words
Large igneous province/ Continental flood basalt/ Mantle plume/ Emeishan/ Siberian/ Deccan分类
天文与地球科学引用本文复制引用
夏林圻,徐学义,李向民,夏祖春,马中平..亚洲3个大火成岩省(峨眉山、西伯利亚、德干)对比研究[J].西北地质,2012,(2):1-26,26.基金项目
中国地质调查局综合研究项目(1212010611804,1212011120133) （1212010611804,1212011120133）
