Pb-Sr isotopes of the Kurile arc provide evidence for Indian-type oceanic crust in the Pacific basin
文献类型：期刊论文
| 作者 | Li, Hong-Yan3,4; Xie, Chao3,4,5; Ryan, Jeffrey G.1; Spencer, Christopher J.2; Liu, Liang3,4; Xu, Yi-Gang3,4 |
| 刊名 | LITHOS
 |
| 出版日期 | 2023-07-01 |
| 卷号 | 448页码:11 |
| 关键词 | Slab dehydration Western Pacific arc Serpentinite dehydration Izanaghi-Pacific ridge Seamounts subduction |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2023.107174 |
| 英文摘要 | The sources and origins of the mobile element phases that enrich convergent plate margin mantle sources and trigger arc melting remain controversial. New high-precision Pb isotope data in combination with Sr isotopes of Kurile arc volcanic rocks reveal that the decomposition of serpentinite below the subducting slab Moho played an important role in generating slab fluid/melt to fertilize the subarc mantle. The Kurile arc volcanic rocks have compositional features indicative of a role for subducted slab inputs. However, the classic model of decompo-sition of hydrous minerals in subducting marine sediments and altered basalts to produce slab-derived fluid and/ or melt phases do not explain Kurile lava compositions. The correlation between Pb and Sr isotopes in Kurile lavas requires that the slab fluids or melts must involve substantial Pb and Sr contributions from comparatively unaltered basalt/dolerite/gabbro with an isotopic signature similar to Indian Ocean mantle. We suggest that the decomposition of serpentinites from below the subducting slab Moho led to substantial fluid-driven extraction of Pb and Sr from relatively unaltered oceanic crust as these deep fluids transited upward through the subduction interface into the mantle wedge. The presence of Indian-type oceanic crust in the northwestern Pacific basin is consistent with recent plate reconstruction results showing that the Cretaceous-age Izanagi-Pacific ridge, which likely created the oceanic crust beneath the present Kurile arc, was adjacent to the mantle of the Neo-Tethys Ocean. A switch from Pacific-type to Indian-type subducting oceanic crust occurred between 50 and 42 Ma beneath the Izu-Bonin arc based on the Pb isotope systematics of erupted lavas from this period. This observation may indicate that subduction of the Izanagi-Pacific ridge along the Asian continental margin between 50 and 40 Ma reduced the velocity of the Pacific plate relative to that of the Philippine Sea Plate, and led to dextral strike -slip of the Izu-Bonin-Mariana subduction zone. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000986052500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80119]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Li, Hong-Yan |
| 作者单位 | 1.Univ S Florida, Sch Geosci, Tampa, FL 33620 USA 2.Queens Univ, Dept Geol Sci & Geol Engn, Kingston, ON K7L 2N8, Canada 3.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Hong-Yan,Xie, Chao,Ryan, Jeffrey G.,et al. Pb-Sr isotopes of the Kurile arc provide evidence for Indian-type oceanic crust in the Pacific basin[J]. LITHOS,2023,448:11. |
| APA | Li, Hong-Yan,Xie, Chao,Ryan, Jeffrey G.,Spencer, Christopher J.,Liu, Liang,&Xu, Yi-Gang.(2023).Pb-Sr isotopes of the Kurile arc provide evidence for Indian-type oceanic crust in the Pacific basin.LITHOS,448,11. |
| MLA | Li, Hong-Yan,et al."Pb-Sr isotopes of the Kurile arc provide evidence for Indian-type oceanic crust in the Pacific basin".LITHOS 448(2023):11. |
入库方式： OAI收割
来源：广州地球化学研究所
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