Petrogenesis of the Mesozoic intrusive complexes from the southern Taihang Orogen, North China Craton: elemental and Sr-Nd-Pb isotopic constraints

被引:169
作者
Chen, B [1 ]
Jahn, BM
Arakawa, Y
Zhai, MG
机构
[1] Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
[2] Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan
[3] Univ Tsukuba, Inst Geosci, Tsukuba, Ibaraki 3058572, Japan
[4] Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
基金
中国国家自然科学基金; 日本学术振兴会;
关键词
D O I
10.1007/s00410-004-0620-0
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A geochemical and isotopic study was carried out for three Mesozoic intrusive suites ( the Xishu, Wu'an and Hongshan suites) from the North China Craton (NCC) to understand their genesis and geodynamic implications. The Xishu and Wu'an suites are gabbroic to monzonitic in composition. They share many common geochemical features like high Mg# and minor to positive Eu anomalies in REE patterns. Initial Nd - Sr isotopic compositions for Xishu suite are epsilon(Nd)(135 Ma)= - 12.3 to - 16.9 and mostly I-Sr = 0.7056 - 0.7071; whereas those for Wu'an suite are slightly different. Pb isotopic ratios for Xishu suite are (Pb-206/Pb-204)(i) = 16.92 - 17.3, (Pb-207/Pb-204)(i) = 15.32 - 15.42, (Pb-208/Pb-204)(i) = 37.16 - 37.63, which are slightly higher than for Wu'an suite. The Xishu - Wu'an complexes are considered to originate from partial melting of an EM1-type mantle source, followed by significant contamination of lower crustal components. The Hongshan suite ( mainly syenite and granite) shows distinctly higher epsilon(Nd)(135 Ma) values ( - 8 to - 11) and slightly higher Pb isotopic ratios than the Xishu - Wu'an suites. It was formed via fractionation of a separate parental magma that also originated from the EM1-type mantle source, with incorporation of a small amount of lower crustal components. Partial melting of the mantle sources took place in a back-arc extensional regime that is related to the subduction of the paleo-Pacific slab beneath the NCC.
引用
收藏
页码:489 / 501
页数:13
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