Recycling of eroded crust by melange diapirs evidenced from the Early Cretaceous arc magmatism in southern Tibet
文献类型：期刊论文
| 作者 | Mai, Yuan-Jun1; Zhu, Li-Dong1; Jin, Xin3; Yang, Wen-Guang1; Tong, Xia1; Zhong, Yao2 |
| 刊名 | LITHOS
 |
| 出版日期 | 2023-10-01 |
| 卷号 | 454页码:15 |
| ISSN号 | 0024-4937 |
| 关键词 | Melange diapir Subduction erosion Lhasa terrane Detrital zircon Tholeiitic arc basalt |
| DOI | 10.1016/j.lithos.2023.107263 |
| 通讯作者 | Zhu, Li-Dong(zhuld@cdut.edu.cn) ; Jin, Xin(347883570@qq.com) |
| 英文摘要 | Crustal material recycling in a subduction factory increases the diversity and complexity of arc magma. However, the exact origin and mechanism of its contribution to arc magma are not fully understood. Here, we present new data on the Molang basaltic rocks from the southern Lhasa terrane to gain an in-depth-understanding of the mechanisms of crustal recycling. The zircon U-Pb ages indicate that these rocks were emplaced at 128 Ma. They display characteristics ranging from forearc basalts to tholeiitic arc basalts with depleted mantle isotope compositions (e(Nd)(t) = +4.58 to +4.86) and zircon e(Hf)(t) values (+7.3 to +8.7). The uniform isotopic composition (Sr-Nd) and fractionation of trace elements show that crustal materials could have been added to the magma source in the form of bulk sediment. Therefore, we have proposed an argument supporting the melange diapirs model. The age spectra of the inherited zircons are consistent with those of the detrital zircons from the subduction hanging wall. This implies that the inherited zircons may be unmolten residues of eroded forearc crust that survived erosion and subduction from the slab in well-mixed melange diapirs that passed through a comparatively hot mantle wedge and occur as key evidence for crustal recycling in the arc magma. Based on a synthesis of earlier research, we suggest that the Molang basaltic rocks were derived from the partial melting of the melange diapirs in a steep subduction setting during a new subduction initiation event involving the NeoTethyan oceanic slab. |
| WOS关键词 | LINZIZONG VOLCANIC SUCCESSION ; CONTINENTAL-CRUST ; SUBDUCTION INITIATION ; LHASA TERRANE ; TRACE-ELEMENT ; GANGDESE BELT ; ROCKS ; GEOCHEMISTRY ; PETROGENESIS ; OPHIOLITE |
| 资助项目 | National Natural Sci-ence Foundation of China[41972118] ; China Postdoctoral Science Foundation[2021M703243] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:001034743800001 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/182538]  |
| 专题 | 中国科学院海洋研究所 |
| 通讯作者 | Zhu, Li-Dong; Jin, Xin |
| 作者单位 | 1.Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China 2.Sichuan Univ, Chengdu 610065, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Mai, Yuan-Jun,Zhu, Li-Dong,Jin, Xin,et al. Recycling of eroded crust by melange diapirs evidenced from the Early Cretaceous arc magmatism in southern Tibet[J]. LITHOS,2023,454:15. |
| APA | Mai, Yuan-Jun,Zhu, Li-Dong,Jin, Xin,Yang, Wen-Guang,Tong, Xia,&Zhong, Yao.(2023).Recycling of eroded crust by melange diapirs evidenced from the Early Cretaceous arc magmatism in southern Tibet.LITHOS,454,15. |
| MLA | Mai, Yuan-Jun,et al."Recycling of eroded crust by melange diapirs evidenced from the Early Cretaceous arc magmatism in southern Tibet".LITHOS 454(2023):15. |
入库方式： OAI收割
来源：海洋研究所
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