Geochemical signature of a deeply subducted slab in the source of post-collisional magmatism: A case study from the Western Tianshan NW China
文献类型：期刊论文
| 作者 | Li, Ning-Bo1,2; Niu, He-Cai1,2; Shan, Qiang1,2; Yang, Wu-Bin1,2 |
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2024 |
| 卷号 | 136期号:1-2页码:82-92 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B36467.1 |
| 英文摘要 | The contributions of deeply subducted slabs to post-collisional magmatism are poorly constrained. Here, we present a study of the post-collisional, Early Permian (ca. 279 Ma), Hamisite basalts from the Western Tianshan NW China to trace the geochemical fingerprints of deeply subducted slab. The Hamisite basalts have arc -like trace element patterns but high Nb/Ta ratios (18.4-23.0). They have slightly enriched Sr-Nd isotopic compositions (87Sr/86Sr = 0.7048-0.7052; epsilon Nd[t] = 2.02-3.85), which indicates that the basalts were derived from an enriched mantle source. Extremely low 67Li values (-5.76%0 to 0.20%0) imply the involvement of a deeply subducted slab (i.e., eclogites) in the source. Correlations among Nb/Ta and (Dy/Yb)N ratios, and rare earth element contents, indicate that the deeply subducted slab contained residual rutile and garnet but no epidote. Given that melting of eclogites requires an anomalously hot mantle source, we propose that mantle upwelling during post-collisional extension triggered melting of the deeply subducted slab. Our results indicate that melting of a deeply subducted slab can generate a metasomatized mantle source with high Nb/Ta ratios, which could be a hidden, high-Nb/Ta reservoir on Earth. Low 67Li values and high Nb/Ta ratios could be a fingerprint of recycling of a deeply subducted slab. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001169970300002 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77379]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Li, Ning-Bo |
| 作者单位 | 1.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Ning-Bo,Niu, He-Cai,Shan, Qiang,et al. Geochemical signature of a deeply subducted slab in the source of post-collisional magmatism: A case study from the Western Tianshan NW China[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2024,136(1-2):82-92. |
| APA | Li, Ning-Bo,Niu, He-Cai,Shan, Qiang,&Yang, Wu-Bin.(2024).Geochemical signature of a deeply subducted slab in the source of post-collisional magmatism: A case study from the Western Tianshan NW China.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,136(1-2),82-92. |
| MLA | Li, Ning-Bo,et al."Geochemical signature of a deeply subducted slab in the source of post-collisional magmatism: A case study from the Western Tianshan NW China".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 136.1-2(2024):82-92. |
入库方式： OAI收割
来源：广州地球化学研究所
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