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Continental crust melting induced by subduction initiation of the South Tianshan Ocean: Insight from the Latest Devonian granitic magmatism in the southern Yili Block, NW China

文献类型：期刊论文

作者Bao, Zihe1,2,3; Cai, Keda1,2; Sun, Min4; Xiao, Wenjiao1,2,3; Wan, Bo3,5; Wang, Yannan1,2,3; Wang, Xiangsong1,2,3; Xia, Xiaoping6
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2018-03-01
卷号153页码:100-117
关键词Yili Block CAOB South Tianshan Ocean Subduction initiation Kazakhstan orocline
ISSN号1367-9120
DOI10.1016/j.jseaes.2017.04.026
文献子类Article
英文摘要The Tianshan belt of the southwestern Central Asian Orogenic Belt was generated by Paleozoic multi-stage subduction and final closure of several extinct oceans, including the South Tianshan Ocean between the Kazakhstan-Yili and Tarim blocks. However, the subduction initiation and polarity of the South Tianshan Ocean remain issues of highly debated. This study presents new zircon U-Pb ages, geochemical compositions and Sr-Nd isotopes, as well as zircon Hf isotopic data of the Latest Devonian to Early Carboniferous granitic rocks in the Wusun Mountain of the Yili Paleozoic convergent margin, which, together with the spatial-temporal distributions of regional magmatic rocks, are applied to elucidate their petrogenesis and tectonic linkage to the northward subduction initiation of the South Tianshan Ocean. Our zircon U-Pb dating results reveal that these granites were emplaced at the time interval of 362.0 +/- 1.2-360.3 +/- 1.9 Ma, suggesting a marked partial melting event of the continental crust in the Latest Devonian to Early Carboniferous. These granites, based on their mineral compositions and textures, can be categorized as monzogranites and K-feldspar granites. Geochemically, both monzogranites and K-feldspar granites have characters of I-type granites with high K20 contents (4.64-4.83 wt.%), and the K-feldspar granites are highly fractionated I-type granites, while the monzogranites have features of unfractionated I-type granites. Whole-rock Sr-Nd isotopic modeling results suggest that ca. 20-40% mantle-derived magmas may be involved in magma mixing with continental crust partial melts to generate the parental magmas of the granites. The mantle-derived basaltic magmas was inferred not only to be a major component of magma mixture but also as an important heat source to fuse the continental crust in an extensional setting, which is evidenced by the high zircon saturation temperatures (713-727 degrees C and 760-782 degrees C) of the studied granites. The Latest Devonian to Early Carboniferous extensional setting in the Wusun Mountain region of the Yili Paleozoic convergent margin is addressed by the subduction initiation of the South Tianshan Ocean and constituted a late Paleozoic nascent arc- back-arc system in the southwestern CAOB.
WOS关键词ASIAN OROGENIC BELT ; PALEOZOIC TECTONIC EVOLUTION ; U-PB GEOCHRONOLOGY ; A-TYPE GRANITES ; CARBONIFEROUS VOLCANIC-ROCKS ; TIEN-SHAN-RANGE ; S-TYPE GRANITES ; I-TYPE GRANITES ; WESTERN TIANSHAN ; CALC-ALKALINE
WOS研究方向Geology
语种英语
WOS记录号WOS:000424181200006
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; National Science Foundation of China(41622205) ; National Science Foundation of China(41622205) ; Xinjiang Outstanding Youth Scientific(2013711003) ; Xinjiang Outstanding Youth Scientific(2013711003) ; Hong Kong Research Grant Council(HKU704712P ; Hong Kong Research Grant Council(HKU704712P ; 704313P) ; 704313P) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; National Science Foundation of China(41622205) ; National Science Foundation of China(41622205) ; Xinjiang Outstanding Youth Scientific(2013711003) ; Xinjiang Outstanding Youth Scientific(2013711003) ; Hong Kong Research Grant Council(HKU704712P ; Hong Kong Research Grant Council(HKU704712P ; 704313P) ; 704313P) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; National Science Foundation of China(41622205) ; National Science Foundation of China(41622205) ; Xinjiang Outstanding Youth Scientific(2013711003) ; Xinjiang Outstanding Youth Scientific(2013711003) ; Hong Kong Research Grant Council(HKU704712P ; Hong Kong Research Grant Council(HKU704712P ; 704313P) ; 704313P) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; National Science Foundation of China(41622205) ; National Science Foundation of China(41622205) ; Xinjiang Outstanding Youth Scientific(2013711003) ; Xinjiang Outstanding Youth Scientific(2013711003) ; Hong Kong Research Grant Council(HKU704712P ; Hong Kong Research Grant Council(HKU704712P ; 704313P) ; 704313P)
源URL[http://ir.iggcas.ac.cn/handle/132A11/82742]  
专题中国科学院地质与地球物理研究所
通讯作者Cai, Keda
作者单位1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, 818 South Beijing Rd, Urumqi 830011, Xinjiang, Peoples R China
2.Xinjiang Key Lab Mineral Resources & Digital Geol, Urumqi 830011, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100029, Peoples R China
4.Univ Hong Kong, Dept Earth Sci, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
6.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510460, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Bao, Zihe,Cai, Keda,Sun, Min,et al. Continental crust melting induced by subduction initiation of the South Tianshan Ocean: Insight from the Latest Devonian granitic magmatism in the southern Yili Block, NW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,153:100-117.
APA Bao, Zihe.,Cai, Keda.,Sun, Min.,Xiao, Wenjiao.,Wan, Bo.,...&Xia, Xiaoping.(2018).Continental crust melting induced by subduction initiation of the South Tianshan Ocean: Insight from the Latest Devonian granitic magmatism in the southern Yili Block, NW China.JOURNAL OF ASIAN EARTH SCIENCES,153,100-117.
MLA Bao, Zihe,et al."Continental crust melting induced by subduction initiation of the South Tianshan Ocean: Insight from the Latest Devonian granitic magmatism in the southern Yili Block, NW China".JOURNAL OF ASIAN EARTH SCIENCES 153(2018):100-117.

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来源：地质与地球物理研究所

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