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Petrogenesis of Cenozoic basalts in central-eastern China: Constraints from Re-Os and PGE geochemistry

文献类型：期刊论文

作者Chu, Zhuyin1; Yan, Yan2; Zeng, Gang3; Tian, Wei4; Li, Chaofeng1; Yang, Yueheng1; Guo, Jinghui1
刊名LITHOS
出版日期2017-05-01
卷号278页码:72-83
关键词Continental basalt Os isotopes Platinum group elements Crustal contamination Pyroxenite Central-eastern China
ISSN号0024-4937
DOI10.1016/j.lithos.2017.01.022
文献子类Article
英文摘要We present Re-Os and PGE (platinum group elements), together with major-, trace-element and Sr-Nd isotope data, to further constrain the petrogenesis for the Cenozoic basalts in central-eastern China. The basalts include low-Ca alkali, high-Ca alkali and tholeiitic varieties. Most low-Ca alkali basalts have unradiogenic Os-187/Os-188 (mostly <0.14), flat chondrite-normalized PGE patterns and depleted Sr-Nd isotopic compositions, indicating that they probably originated from a depleted mantle source with insignificant shallow-level crustal contamination. Minor high-Ca alkali/tholeiitic basalts have low PGE concentrations, particularly Os (down to 0.0056 ppb), and highly suprachondritic initial Os-187/Os-188 ratios (up to >0.4), indicating involvements of sulfide/PGE-alloy segregation-AFC (assimilation-fractionation-contamination) processes. Most tholeiites and high-Ca alkali basalts have relatively high Os concentrations, highly variable and suprachondritic Os isotopic compositions, high Pd/Ir ratios and enriched Sr-Nd isotopic compositions. Modeling results reveal that the Os isotopic variations in these basalts cannot be ascribed to crustal contamination during ascent but mainly reflect source characteristics. Combined with their low CaO, low Mg-#, high FC3MS values (FeOT/CaO-3 x MgO/SiO2, all in wt%), and high Fe/Mn signatures, a large portion of pyroxenite is inferred as an enriched component in the mantle sources to account for their highly suprachondritic Os isotopic compositions. The formation of the pyroxenites was probably due to the subducted sediment-bearing Pacific oceanic crust or the recycled lower continental crust resulted from the collision between the Yangtze and North China blocks. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词CRUST-MANTLE INTERACTION ; IONIZATION MASS-SPECTROMETRY ; HIGHLY SIDEROPHILE ELEMENT ; XENOLITH-MAGMA INTERACTION ; PLATINUM-GROUP ELEMENTS ; MIDOCEAN RIDGE BASALTS ; OSMIUM ISOTOPE ; TRACE-ELEMENT ; LITHOSPHERIC MANTLE ; SOURCE LITHOLOGY
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000399258500005
出版者ELSEVIER SCIENCE BV
资助机构National Natural Science Foundation of China(41273018 ; National Natural Science Foundation of China(41273018 ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(11401790) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(11401790) ; 41525012) ; 41525012) ; National Natural Science Foundation of China(41273018 ; National Natural Science Foundation of China(41273018 ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(11401790) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(11401790) ; 41525012) ; 41525012) ; National Natural Science Foundation of China(41273018 ; National Natural Science Foundation of China(41273018 ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(11401790) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(11401790) ; 41525012) ; 41525012) ; National Natural Science Foundation of China(41273018 ; National Natural Science Foundation of China(41273018 ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(11401790) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences(11401790) ; 41525012) ; 41525012)
源URL[http://ir.iggcas.ac.cn/handle/132A11/42519]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Chu, Zhuyin
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.China Natl Nucl Corp, Beijing Res Inst Uranium Geol, Beijing 100029, Peoples R China
3.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210046, Jiangsu, Peoples R China
4.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, MOE, Beijing 100871, Peoples R China
推荐引用方式
GB/T 7714		 Chu, Zhuyin,Yan, Yan,Zeng, Gang,et al. Petrogenesis of Cenozoic basalts in central-eastern China: Constraints from Re-Os and PGE geochemistry[J]. LITHOS,2017,278:72-83.
APA Chu, Zhuyin.,Yan, Yan.,Zeng, Gang.,Tian, Wei.,Li, Chaofeng.,...&Guo, Jinghui.(2017).Petrogenesis of Cenozoic basalts in central-eastern China: Constraints from Re-Os and PGE geochemistry.LITHOS,278,72-83.
MLA Chu, Zhuyin,et al."Petrogenesis of Cenozoic basalts in central-eastern China: Constraints from Re-Os and PGE geochemistry".LITHOS 278(2017):72-83.

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来源：地质与地球物理研究所

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