| Mineral Compositions of Syn-collisional Granitoids and their Implications for the Formation of Juvenile Continental Crust and Adakitic Magmatism | |
Xiao, Yuanyuan1,2; Chen, Shuo1,2,3; Niu, Yaoling2,4,5; Wang, Xiaohong1,2; Xue, Qiqi5; Wang, Guodong6; Gao, Yaijie1,2,3; Gong, Hongmei1,2; Kong, Juanjuan1,2,3; Shao, Fengli7 ; Sun, Pu1,2,3; Duan, Meng5; Hong, Di1,2,3; Wang, Dong1,2,3
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| 2020-03-01 | |
| 发表期刊 | JOURNAL OF PETROLOGY
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| ISSN | 0022-3530 |
| 卷号 | 61期号:3页码:19 |
| 通讯作者 | Xiao, Yuanyuan(yuanyuan.xiao@qdio.ac.cn) |
| 摘要 | Continentalcollision zones have been proposed as primary sites of net continental crustal growth. Therefore, studies on syn-collisional granitoids with mafic magmatic enclaves (MMEs) are essential for testing this hypothesis. The Baojishan (BJS) and Qumushan (QMS) syn-collisional plutons in the North Qilian Orogen (NQO) on the northern margin of the Tibetan Plateau have abundant MMEs in sharp contact with host granitoids, sharing similar constituent minerals but with higher modal abundances of mafic minerals in MMEs. The QMS host granitoids have high Sr/Y and La/Yb ratios, showing adakitic compositions, which are differentfrom the BJS granitoids. Based on bulkrock compositions and zircon U-Pb age-dating, recent studies on these two plutons proposed that MMEs represent cumulates crystallized early from the same magmatic system as their host granitoids, and their parental melts are best understood as andesitic magmas produced by partial melting of the underthrusting upper ocean crust upon collision with some terrigenous sediments under amphibolite facies. Here, we focus on the trace-element geochemistry of the constituent mineral phases of both MMEs and their host granitoids of the QMS and BJS plutons. Weshow that different mineral phases preferentially host different trace elements; for example, most rare earth elements (REEs and Y) reside in titanite (only found in the QMS pluton), amphibole, apatite, epidote and zircon (mostly heavy-REEs); and high-field-strength elements (HFSEs) reside in biotite, titanite, amphibole and zircon. Based on the mineral chemical data, we show that for these two plutons, MMEs are of similar cumulate origin, crystallized from primitive andesitic melts in the early stage of granitoid magmatism. The primitive andesitic melts for these syn-collisional granitoids are most likely produced by the partial melting of the oceanic crust, supporting the hypothesis of continental crustal growth considering the syn-collisional granitoids represent juvenile continental crust. As evidenced by distinct mineral compositions, the two plutons have different parental magma compositions, for example higher TiO2 content and higher Sr/Y and La/Yb ratios in the QMS parental magmas, a signature best understood as being inherited from the source. The higher TiO2 content of the parental magma for the QMS pluton leads to the common presence of titanite in the QMS pluton (absent in the BJS pluton), crystallization of which in turn controls the trace-element (REE, Y, Nb, Ta and others) systematics in the residual melts towards an adakitic signature. Therefore, parental magmas with high TiO2 content and high Sr/Y and La/Yb ratios, as well as their further fractionation of titanite, are important factors in the development of adakitic compositions, as represented by the QMS host granitoids. This model offers a new perspective on the petrogenesis of adakitic rocks. The present study further demonstrates that, in general, mineral chemistry holds essential information for revealing the petrogenesis of granitoid rocks. |
| 关键词 | adakitic rocks mineral chemistry mafic magmatic enclaves North Qilian Orogen syn-collisional granitoid petrogenesis |
| DOI | 10.1093/petrology/egaa038 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[41776096] ; National Natural Science Foundation of China[41572047] ; National Natural Science Foundation of China[U16064101] ; National Natural Science Foundation of China[41130314] ; National Natural Science Foundation of China[41630968] ; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, China ; Excellent Young Project of the Institute of Oceanology, Chinese Academy of Sciences[Y52221101Q] |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000599213000006 |
| 出版者 | OXFORD UNIV PRESS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/169490 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Xiao, Yuanyuan |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 5.China Univ Geosci, Sch Earth Sci & Mineral Resources, Beijing 100083, Peoples R China 6.Linyi Univ, Sch Resources & Environm, Shandong Prov Key Lab Water & Soil Conservat & En, Linyi 276000, Shandong, Peoples R China 7.Linyi Univ, Inst Geol & Paleontol, Linyi 276000, Shandong, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 通讯作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Xiao, Yuanyuan,Chen, Shuo,Niu, Yaoling,et al. Mineral Compositions of Syn-collisional Granitoids and their Implications for the Formation of Juvenile Continental Crust and Adakitic Magmatism[J]. JOURNAL OF PETROLOGY,2020,61(3):19. |
| APA | Xiao, Yuanyuan.,Chen, Shuo.,Niu, Yaoling.,Wang, Xiaohong.,Xue, Qiqi.,...&Wang, Dong.(2020).Mineral Compositions of Syn-collisional Granitoids and their Implications for the Formation of Juvenile Continental Crust and Adakitic Magmatism.JOURNAL OF PETROLOGY,61(3),19. |
| MLA | Xiao, Yuanyuan,et al."Mineral Compositions of Syn-collisional Granitoids and their Implications for the Formation of Juvenile Continental Crust and Adakitic Magmatism".JOURNAL OF PETROLOGY 61.3(2020):19. |
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| egaa038.pdf（3676KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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