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Timing and source constraints on the relationship between mafic and felsic intrusions in the Emeishan large igneous province

文献类型：期刊论文

作者Zhong, Hong1; Campbell, Ian H.2; Zhu, Wei-Guang1; Allen, Charlotte M.2; Hu, Rui-Zhong1; Xie, Lie-Wen3; He, De-Feng1
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2011-03-01
卷号75期号:5页码:1374-1395
ISSN号0016-7037
DOI10.1016/j.gca.2010.12.016
文献子类Article
英文摘要Several I- and A-type granite, syenite plutons and spatially associated, giant Fe-Ti-V deposit-bearing mafic-ultramafic layered intrusions occur in the Pan-Xi (Panzhihua-Xichang) area within the inner zone of the Emeishan large igneous province (ELIP). These complexes are interpreted to be related to the Emeishan mantle plume. We present LA-ICP-MS and SIMS zircon U-Pb ages and Hf-Nd isotopic compositions for the gabbros, syenites and granites from these complexes. The dating shows that the age of the felsic intrusive magmatism (256.2 +/- 3.0-259.8 +/- 1.6 Ma) is indistinguishable from that of the mafic intrusive magmatism (255.4 +/- 3.1-259.5 +/- 2.7 Ma) and represents the final phase of a continuous magmatic episode that lasted no more than 10 Myr. The upper gabbros in the mafic-ultramafic intrusions are generally more isotopically enriched (lower epsilon(Nd) and epsilon(Hf)) than the middle and lower gabbros, suggesting that the upper gabbros have experienced a higher level of crustal contamination than the lower gabbros. The significantly positive epsilon(Hf)(t) values of the A-type granites and syenites (+4.9 to +10.8) are higher than those of the upper gabbros of the associated mafic intrusion, which shows that they cannot be derived by fractional crystallization of these bodies. They are however identical to those of the mafic enclaves (+7.0 to +11.4) and middle and lower gabbros, implying that they are cogenetic. We suggest that they were generated by fractionation of large-volume, plume-related basaltic magmas that ponded deep in the crust. The deep-seated magma chamber erupted in two stages: the first near a density minimum in the basaltic fractionation trend and the second during the final stage of fractionation when the magma was a low density Fe-poor, Si-rich felsic magma. The basaltic magmas emplaced in the shallow-level magma chambers differentiated to form mafic ultramafic layered intrusions accompanied by a small amount of crustal assimilation through roof melting. Evolved A-type granites (synenites and syenodiorites) were produced dominantly by crystallization in the deep crustal magma chamber. In contrast, the 1-type granites have negative epsilon(Nd)(t) [-6.3 to -7.5] and epsilon(Hf)(t) [-1.3 to -6.7] values, with the Nd model ages (T(DM2)(Nd)) of 1.63-1.67 Ga and Hf model ages (T(DM2)(Hf)) of 1.56-1.58 Ga, suggesting that they were mainly derived from partial melting of Mesoproterozoic crust. In combination with previous studies, this study also shows that plume activity not only gave rise to reworking of ancient crust, but also significant growth of juvenile crust in the center of the ELIP. (C) 2010 Elsevier Ltd. All rights reserved.
WOS关键词PB ZIRCON GEOCHRONOLOGY ; PLUME-LITHOSPHERE INTERACTION ; ND ISOTOPIC GEOCHEMISTRY ; HONGGE LAYERED INTRUSION ; FLOOD-BASALT PROVINCE ; ELA-ICP-MS ; SW CHINA ; U-PB ; SOUTHWESTERN CHINA ; MANTLE PLUME
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000287289200012
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Key Basic Research Program of China(2007CB411401) ; National Key Basic Research Program of China(2007CB411401) ; "CAS Hundred Talents" Foundation of the Chinese Academy of Sciences ; "CAS Hundred Talents" Foundation of the Chinese Academy of Sciences ; National Natural Science Foundation of China(40673030 ; National Natural Science Foundation of China(40673030 ; 40873028) ; 40873028) ; National Key Basic Research Program of China(2007CB411401) ; National Key Basic Research Program of China(2007CB411401) ; "CAS Hundred Talents" Foundation of the Chinese Academy of Sciences ; "CAS Hundred Talents" Foundation of the Chinese Academy of Sciences ; National Natural Science Foundation of China(40673030 ; National Natural Science Foundation of China(40673030 ; 40873028) ; 40873028) ; National Key Basic Research Program of China(2007CB411401) ; National Key Basic Research Program of China(2007CB411401) ; "CAS Hundred Talents" Foundation of the Chinese Academy of Sciences ; "CAS Hundred Talents" Foundation of the Chinese Academy of Sciences ; National Natural Science Foundation of China(40673030 ; National Natural Science Foundation of China(40673030 ; 40873028) ; 40873028) ; National Key Basic Research Program of China(2007CB411401) ; National Key Basic Research Program of China(2007CB411401) ; "CAS Hundred Talents" Foundation of the Chinese Academy of Sciences ; "CAS Hundred Talents" Foundation of the Chinese Academy of Sciences ; National Natural Science Foundation of China(40673030 ; National Natural Science Foundation of China(40673030 ; 40873028) ; 40873028)
源URL[http://ir.iggcas.ac.cn/handle/132A11/73568]  
专题中国科学院地质与地球物理研究所
通讯作者Zhong, Hong
作者单位1.Chinese Acad Sci, State Key Lab Ore Deposit Geochem, Inst Geochem, Guiyang 550002, Peoples R China
2.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Zhong, Hong,Campbell, Ian H.,Zhu, Wei-Guang,et al. Timing and source constraints on the relationship between mafic and felsic intrusions in the Emeishan large igneous province[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2011,75(5):1374-1395.
APA Zhong, Hong.,Campbell, Ian H..,Zhu, Wei-Guang.,Allen, Charlotte M..,Hu, Rui-Zhong.,...&He, De-Feng.(2011).Timing and source constraints on the relationship between mafic and felsic intrusions in the Emeishan large igneous province.GEOCHIMICA ET COSMOCHIMICA ACTA,75(5),1374-1395.
MLA Zhong, Hong,et al."Timing and source constraints on the relationship between mafic and felsic intrusions in the Emeishan large igneous province".GEOCHIMICA ET COSMOCHIMICA ACTA 75.5(2011):1374-1395.

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来源：地质与地球物理研究所

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