Sediment recycling by continental subduction indicated by B-Hf-Pb-Nd isotopes from Miocene-Quaternary lavas in the northern margin of Tibet
文献类型：期刊论文
| 作者 | Zhang, Xiu-Zheng; Wang, Qiang; Kerr, Andrew C.; Wei, Gang-Jian; Qi, Yue; Liu, Ying; Yang, Yu-Cheng |
| 刊名 | LITHOS
 |
| 出版日期 | 2023 |
| 卷号 | 444页码:107109 |
| 关键词 | MANTLE BENEATH TIBET ARC LAVAS VOLCANIC-ROCKS CRUSTAL BORON GEOCHEMISTRY SYSTEMATICS CONSTRAINTS EVOLUTION MAGMAS |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2023.107109 |
| 英文摘要 | Although it has been argued that sediment recycling plays an important role in the differentiation of the con-tinental crust, boron (B) isotopic data does not support a direct input of subducted sediments into arc magmas. This raises questions about the viability of sediment recycling as a process in the differentiation of continental crust. Here, we report B isotopic data from Miocene-Quaternary lavas derived from different sources in the northern margin of Tibet. These lavas have high B contents and negative 811B values close to those of continental sediments. Strongly peraluminous rhyolites have the highest B (93 to 1559 ppm) contents with negative 811B (-9.7 to-17.9) values. Adakitic dacites and trachyandesites exhibit the lowest B (18 to 29 ppm) contents with markedly negative 811B (-12.0 to-35.7) values whereas olivine leucitites have B (37.2 to 59.3 ppm) contents with negative 811B (-8.3 to-15.6) values. These lavas also have enriched Hf-Pb-Nd isotopic compositions similar to those of sediments. This data, combined with numerical modelling and geophysical and tectonic data for Cenozoic continental subduction in the northern margin of Tibet, indicates that: (1) the strongly per-aluminous rhyolites were generated by partial melting of mica-bearing continental sedimentary rocks subducted to the depth of mid-to-lower crust; (2) adakitic lavas were derived by partial melting of sediment-bearing thickened lower crust underwent dehydration and eclogites-facies metamorphism; and (3) olivine leucitites were generated by partial melting of enriched mantle metasomatized by sediment-bearing eclogite-facies crust -derived melts. Thus, at continental convergent margins, continental subduction is an important mechanism for sediment recycling and the evolution of continental crust. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000955774900001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80400]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Zhang, Xiu-Zheng,Wang, Qiang,Kerr, Andrew C.,et al. Sediment recycling by continental subduction indicated by B-Hf-Pb-Nd isotopes from Miocene-Quaternary lavas in the northern margin of Tibet[J]. LITHOS,2023,444:107109. |
| APA | Zhang, Xiu-Zheng.,Wang, Qiang.,Kerr, Andrew C..,Wei, Gang-Jian.,Qi, Yue.,...&Yang, Yu-Cheng.(2023).Sediment recycling by continental subduction indicated by B-Hf-Pb-Nd isotopes from Miocene-Quaternary lavas in the northern margin of Tibet.LITHOS,444,107109. |
| MLA | Zhang, Xiu-Zheng,et al."Sediment recycling by continental subduction indicated by B-Hf-Pb-Nd isotopes from Miocene-Quaternary lavas in the northern margin of Tibet".LITHOS 444(2023):107109. |
入库方式： OAI收割
来源：广州地球化学研究所
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