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峨眉火成岩省:结构、成因与特色
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引用本文:侯增谦,卢记仁,汪云亮,夏林圻,李红阳,国连杰.1999.峨眉火成岩省:结构、成因与特色[J].地质论评,45(7):885-891
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作者单位
侯增谦 中国地质科学院北京,100037成都理工学院610069中国地质科学院西安地质矿产研究所,710054中国科学院贵阳地球化学研究所,510002中国科学院地质研究所北京,100081 
卢记仁  
汪云亮  
夏林圻  
李红阳  
国连杰  
中文摘要:峨眉火成岩省既有其它大火成岩省(如印度德干火成岩省)的一般特征,更独具中国特色:其形成于全球性重大地质变革——大陆敛合与解体的大背景之下,和板块构造体制向大陆构造体制转化过渡的关键时期;处于东部滨太平洋构造域与西部古特提斯构造域的交汇、叠加与枢纽部位;显示清楚完好的地幔热柱“头冠”与“尾柱”轮廓;火成岩省岩石圈存在异常显著的地幔热—侵蚀作用;火成岩省西部发育三套各具特色的成矿系统。深入研究峨眉火成岩省,不仅可提供中国境内地幔热柱岩浆作用典型实例,而且可深刻理解大陆岩石圈深部作用过程和大陆动力学程式,以及大规模成矿作用的深部约束机制。
中文关键词:峨眉火成岩省、地幔、热柱、CFB成因、火成岩省特色
 
Emei Large Igneous Province: Characteristics and Origin
NameInstitution
Hou ZengqianChinese Academy of Geological Sciences, Beijing, 100037;Chengdu Institute of Technology, Chengdu, 610059;Xi'an Institute of Geology and Mineral Resource, CAGS, Xi'an,710054;Institute of Geochemistry, Chinese Academy of Sciences, Guizhou,550002; Institute of Geology, Chinese Academy of Sciences, Beijing, 100029
Lu Jiren
Wang Yunliang
Xia Linqi
Li Hongyang
Guo Lianjie
Abstract:The Emei large igneous province (LIP), with area about 500000 km2, almost c ov ers Sichuan, Guizhou and Yunnan Provinces. The continental flood basalt (CFB) in the Emei LIP is characterized by shorter eruption period (259~261.5 Ma), huge vo lume (300000 km3) and higher productive ratio (150000 km3/year). The evidenc e fr om the temporal spatial distribution, igneous association, petrology and geoche m istry of the igneous rocks indicates that the CFB is a product of the mantle plu me magmatism. The Emei LIP possesses general characteristics of the worldwide LI Ps, e.g., Decan, India, but shows some special aspects. The Emei LIP formed in a geodynamic setting of continental breakup and convergence collision, and in a transitional period from plate tectonic to continental tectonic systems in China . It is tectonically located in intersection region between the Pacific tectonic domain and Paleo Tethys tectonic domain. The Emei LIP shows a clear outline of mantle plume trail and head. The tomographical data indicate that the stronger t hermal erosion had occurred in the Emei continental lithosphere. Accompanying w i th formation of the Emei LIP, three important metallogenic systems were develope d. Though studies of the Emei LIP, a typical example of mantle plume magmatism w ould be supplied, the understanding on lithosphere asthenosphere interaction, c o ntinental dynamic processes and lt's constraint on large scale mineralization w ould be increased.
keywords:Emei LIP  main feature  CFB origin  mantle plume
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