Crustal recycling and growth via mélange diapir in subduction zones: Insights from two episodes of magmatism in the Northern Yili Block, NW China
文献类型：期刊论文
| 作者 | Wang, Xiangsong2; Sun, Min2; Cai, Keda3,4,6; Zhao, Guochun2; Xiao, Wenjiao5; Xia, Xiaoping1 ; Li, Pengfei1
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| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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| 出版日期 | 2024 |
| 卷号 | 136期号:1-2页码:774-792 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B36447.1 |
| 英文摘要 | Arc magmatism can provide crucial information about crustal recycling and growth in subduction zones. However, the crustal material transfer process and mechanism from subducting slab to overlying mantle wedge are controversial. Here, we present detailed petrological, geochronological, geochemical, and Sr-Nd-Hf isotopic data, and previously published data for two episodes of subduction-related magmatism in the Northern Yili Block, NW China, to study these issues in relation to the recycling of continental crust and the growth of two separate magmatic episodes at 400-350 Ma and 350-300 Ma, respectively. The Nd-Sr isotope modeling results, low Nd/Sr, and variable Hf/Nd ratios demonstrate that the arc magmatism of these two episodes could be derived from two distinct melange sources that formed at the slab -mantle interface during subduction of the Junggar oceanic plate. In the first episode, magmatic rocks exhibit high Th/Yb and (La/Sm)N ratios and the decoupling of Nd-Hf isotopes, which leads to an interpretation that the primary magmas were derived from sources mainly mixed by sediments and mantle -wedge peridotites. In contrast, the magmas of the second episode exhibit high Ba/La and Ba/Th ratios and the coupling of Nd-Hf isotopes, which implies that these magmas were likely produced from melange diapirs dominated by the mixing of midoceanic -ridge basalts and mantle peridotites. The episodes of Nd-Hf isotopic decoupling and coupling coincided with crustal material recycling and crustal growth in subduction zones, respectively. Considering that the Northern Yili Block at 400-350 Ma was characterized mainly by enriched Nd-Hf isotopes of magmatic rocks and no development of the forearc accretionary complex, while the Northern Yili Block at 350-300 Ma featured high epsilon Hf(t)-epsilon Nd(t) values of magmatic rocks, occurrences of extension -related magmatism, and distribution of the forearc accretionary complex and immature back -arc basin, we propose that these two different melange sources probably developed in response to subduction transition. That is, one resulted from advancing and the other was relevant to retreating regime. The partial melting of these melanges in the mantle wedge generated intermediate felsic magmas, which might have acted as a leading mechanism for crustal recycling and growth of the accretionary orogenic belt. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001167981400006 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77315]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Cai, Keda |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510460, Peoples R China 2.Univ Hong Kong, Dept Earth Sci, Pokflam Rd, Hong Kong, Peoples R China 3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 4.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 5.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China 6.China Univ Geosci, 29 Xueyuan Rd, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Xiangsong,Sun, Min,Cai, Keda,et al. Crustal recycling and growth via mélange diapir in subduction zones: Insights from two episodes of magmatism in the Northern Yili Block, NW China[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2024,136(1-2):774-792. |
| APA | Wang, Xiangsong.,Sun, Min.,Cai, Keda.,Zhao, Guochun.,Xiao, Wenjiao.,...&Li, Pengfei.(2024).Crustal recycling and growth via mélange diapir in subduction zones: Insights from two episodes of magmatism in the Northern Yili Block, NW China.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,136(1-2),774-792. |
| MLA | Wang, Xiangsong,et al."Crustal recycling and growth via mélange diapir in subduction zones: Insights from two episodes of magmatism in the Northern Yili Block, NW China".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 136.1-2(2024):774-792. |
入库方式： OAI收割
来源：广州地球化学研究所
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