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High-Mg adakitic rocks in the Dabie orogen, central China: Implications for foundering mechanism of lower continental crust

文献类型：期刊论文

作者Huang, Fang1,2; Li, Shuguang1; Dong, Feng1; He, Yongsheng1; Chen, Fukun3
刊名CHEMICAL GEOLOGY
出版日期2008-09-30
卷号255期号:1-2页码:1-13
关键词Dabie orogen Recycling High-Mg adakite Delamination and foundering Tan-Lu fault
ISSN号0009-2541
DOI10.1016/j.chemgeo.2008.02.014
文献子类Review
英文摘要The late Mesozoic high-Mg adakitic rocks from Eastern and Central China provide important insight into the foundering mechanism of the over-thickened lower continental crust. The Chituling high-Mg adakites (131 +/- 3 Ma, SHRIMP zircon U-Pb age) from the eastern margin of the Southern Dabie ultrahigh pressure metamorphic zone, adjacent to the Tan-Lu fault, have high Al2O3 and Sr contents, high Sr/Y, La/Yb, and Mg# (44-63), but low Yand Yb contents. The samples also have moderately enriched Sr-87/(86)Sri (0.70691-0.70775), very low epsilon(Nd)(T) (-20.7 to -24.9), unradiogenic Pb isotopes, enrichment of large ion lithophile elements, and depletion of high field strength elements. These geochemical features indicate that they did not result from melting of young oceanic crust, assimilation and fractional crystallization, or magma mixing. Instead, they were derived from partial melting of delaminated lower continental crust, with subsequent reaction with surrounding mantle peridotites during ascent to crustal depths. The reactions between the adakitic melt and peridotites also generated the enriched mantle source of the post-collisional basaltic rocks in the Dabie orogen. Distribution of the late Mesozoic high-Mg adakites in eastern and central China generally forms a high-Mg adakite belt along the southern Tan-Lu fault. Therefore, we propose that the large strike-slip motion of the Tan-Lu fault in eastern and central China due to the western subduction of the Pacific plate in the early Cretaceous might trigger the foundering of some fragments of the over-thickened lithosphere near the Tan-Lu fault, which caused mantle upwelling and partial melting of the thickened lower crust in the Dabie orogen and eastern boundary of the North China Craton. This further weakened the gravitationally instable lithosphere, consequently resulting in delamination and foundering of the mountain root underneath the Dabie orogen, which could be an important foundering mechanism of lower continental crust. (C) 2008 Published by Elsevier B.V.
WOS关键词ZIRCON U-PB ; THICKENED LOWER CRUST ; CU-AU MINERALIZATION ; EAST-CENTRAL CHINA ; NORTH-CHINA ; ISOTOPIC COMPOSITIONS ; LITHOSPHERIC MANTLE ; IGNEOUS ROCKS ; METAMORPHIC ROCKS ; TRACE-ELEMENT
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000260235400001
出版者ELSEVIER SCIENCE BV
资助机构Chinese Academy of Sciences(KZCX2-YW-131) ; Chinese Academy of Sciences(KZCX2-YW-131) ; Natural Science Foundation of China(40373009 ; Natural Science Foundation of China(40373009 ; 40773013) ; 40773013) ; Chinese Academy of Sciences(KZCX2-YW-131) ; Chinese Academy of Sciences(KZCX2-YW-131) ; Natural Science Foundation of China(40373009 ; Natural Science Foundation of China(40373009 ; 40773013) ; 40773013) ; Chinese Academy of Sciences(KZCX2-YW-131) ; Chinese Academy of Sciences(KZCX2-YW-131) ; Natural Science Foundation of China(40373009 ; Natural Science Foundation of China(40373009 ; 40773013) ; 40773013) ; Chinese Academy of Sciences(KZCX2-YW-131) ; Chinese Academy of Sciences(KZCX2-YW-131) ; Natural Science Foundation of China(40373009 ; Natural Science Foundation of China(40373009 ; 40773013) ; 40773013)
源URL[http://ir.iggcas.ac.cn/handle/132A11/69368]  
专题中国科学院地质与地球物理研究所
通讯作者Huang, Fang
作者单位1.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Dept Earth & Space Sci, Hefei 230026, Anhui, Peoples R China
2.Univ Illinois, Dept Geol, Urbana, IL 61801 USA
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Huang, Fang,Li, Shuguang,Dong, Feng,et al. High-Mg adakitic rocks in the Dabie orogen, central China: Implications for foundering mechanism of lower continental crust[J]. CHEMICAL GEOLOGY,2008,255(1-2):1-13.
APA Huang, Fang,Li, Shuguang,Dong, Feng,He, Yongsheng,&Chen, Fukun.(2008).High-Mg adakitic rocks in the Dabie orogen, central China: Implications for foundering mechanism of lower continental crust.CHEMICAL GEOLOGY,255(1-2),1-13.
MLA Huang, Fang,et al."High-Mg adakitic rocks in the Dabie orogen, central China: Implications for foundering mechanism of lower continental crust".CHEMICAL GEOLOGY 255.1-2(2008):1-13.

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来源：地质与地球物理研究所

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