Different effects of serpentinite-derived and slab-derived fluids on arc magmatism in the Chinese Eastern Tianshan: evidence from Mg-B isotopic systematics
文献类型：期刊论文
| 作者 | Du, Long1,2; Zhang, Yunying3; Zhu, Hongli4 ; Zhang, Zhaofeng5; An, Yajun5; Yuan, Chao6; Huang, Zongying6; Li, Xuping1; Long, Xiaoping2
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| 刊名 | JOURNAL OF THE GEOLOGICAL SOCIETY
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| 出版日期 | 2023-09-29 |
| 卷号 | 180期号:5页码:10 |
| ISSN号 | 0016-7649 |
| DOI | 10.1144/jgs2023-011 |
| 通讯作者 | Long, Xiaoping(longxp@nwu.edu.cn) |
| 英文摘要 | Fluids are important media for elemental cycling in subduction zones, but the compositions of such fluids remain obscure, especially those derived from dehydration of serpentinite. To better understand the role of subduction-zone fluids in arc magmatism of the Chinese Eastern Tianshan (CET), we present Mg and B isotopic data for the arc diorites (e.g. Kalatage and Nanshankou). Our results show that the Kalatage diorites have higher delta Mg-26 (-0.23 to -0.13 parts per thousand) and delta B-11 (-0.04 to +1.08 parts per thousand) values than the corresponding mantle values, whereas the Nanshankou diorites display relatively lower delta Mg-26 (-0.26 to -0.19 parts per thousand ) and 811B (-10.7 to -2.97 parts per thousand) values. Because high-temperature magmatic and post-magmatic processes have limited effects on Mg and B isotope fractionation of our samples, their distinct Mg-B isotopic signatures inherited from the mantle sources should be caused by subduction-related metasomatism. Because neither altered oceanic crust (AOC) directly melting nor the incorporation of subducted sediments could induce significant Mg-B isotope fractionation in these rocks, we infer that their variable delta Mg-26 and delta B-11 values were probably associated with subduction fluids that were derived from different sources. Specifically, dehydrated fluids from serpentinites possess high delta Mg-26 and delta B-11 values, which resulted in the heavy Mg-B isotopic compositions of the Kalatage diorites, whereas mantle metasomatized by fluids from AOC and subducted sediments were responsible for the Nanshankou rocks with relatively low delta Mg-26 and delta B-11 values. Taking into account the different effects of serpentinite-derived and slab-derived fluids in the formation of arc magmatism, subduction-zone fluids can be probably an important factor in changing the Mg-B isotope composition of mantle sources. |
| WOS关键词 | BORON ISOTOPE ; SUBDUCTION ZONES ; OROGENIC BELT ; MANTLE WEDGE ; FORE-ARC ; GRANITOIDS ; FRACTIONATION ; CONSTRAINTS ; LAVAS ; HETEROGENEITY |
| 资助项目 | We thank Jinlong Ma and Le Zhang for their help with the geochemical analyses. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | GEOLOGICAL SOC PUBL HOUSE |
| WOS记录号 | WOS:001079766600013 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/181552]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Long, Xiaoping |
| 作者单位 | 1.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Res Ctr Continental Dynam, Qingdao 266590, Peoples R China 2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 3.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Innovat Acad South China Sea Ecol & Environm Engn, Guangzhou 510301, Peoples R China 4.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanog, Qingdao 266071, Peoples R China 5.Chengdu Univ Technol, Coll Earth Sci, Int Ctr Planetary Sci, Chengdu 610059, Peoples R China 6.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Du, Long,Zhang, Yunying,Zhu, Hongli,et al. Different effects of serpentinite-derived and slab-derived fluids on arc magmatism in the Chinese Eastern Tianshan: evidence from Mg-B isotopic systematics[J]. JOURNAL OF THE GEOLOGICAL SOCIETY,2023,180(5):10. |
| APA | Du, Long.,Zhang, Yunying.,Zhu, Hongli.,Zhang, Zhaofeng.,An, Yajun.,...&Long, Xiaoping.(2023).Different effects of serpentinite-derived and slab-derived fluids on arc magmatism in the Chinese Eastern Tianshan: evidence from Mg-B isotopic systematics.JOURNAL OF THE GEOLOGICAL SOCIETY,180(5),10. |
| MLA | Du, Long,et al."Different effects of serpentinite-derived and slab-derived fluids on arc magmatism in the Chinese Eastern Tianshan: evidence from Mg-B isotopic systematics".JOURNAL OF THE GEOLOGICAL SOCIETY 180.5(2023):10. |
入库方式： OAI收割
来源：海洋研究所
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