Decoupling of Hf-Nd Isotopes in Challenger Deep Sediments, Mariana Trench: Implications for Sedimentary Hf and Nd Recycling in Subduction Zones
文献类型：期刊论文
| 作者 | Pang, Chong-Jin7; Tian, Liyan6; Wang, Xuan-Ce4,5; Zhang, Hanyu6; Wen, Shu-Nv7; Krapez, Bryan7; Liu, Wen-Jing2,3; Liu, Zhi-Xing4; Wu, Tao1 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2021-06-01 |
| 卷号 | 126期号:6页码:20 |
| 关键词 | Hf-Nd isotopic decoupling oceanic hydrodynamic mineral sorting sedimentary Hf-Nd recycling density-current deposits Challenger Deep subduction factory |
| ISSN号 | 2169-9313 |
| DOI | 10.1029/2021JB021641 |
| 英文摘要 | Decoupling between Hf and Nd isotopes in trench sediments is an important way to produce, via subduction-related recycling, the mantle chemical heterogeneity that is evident in many arc-related magmas. Sediments collected from >7,000 m water depths on the southern and northern slopes of the Challenger Deep were analyzed to understand the factors controlling the variation in Hf and Nd isotopic compositions. These sediments were transported to both flanks of the Challenger Deep by synchronous density currents. All sediment samples show positive e(Hf) values and negative e(Nd) values, mostly plotting above the seawater and terrestrial arrays in Hf-Nd isotope space. Hafnium isotopic compositions in each depositional unit vary (high up to 9.2 e(Hf) units) from lower, coarse-grained laminae to upper, fine-grained graded intervals, showing a good correspondence between e(Hf) values and lamination within depositional units. Such variations are explained by the concentration of Fe-Mn oxyhydroxide-bearing clays in the upper graded intervals, whereas diatom fragments and arc-volcanic detritus are preferentially sorted into lower laminae. These findings demonstrate that the decoupling of Hf-Nd isotopes in trench sediments is not only linked to the nature of provenance but also to hydrodynamic sorting processes during sediment transport. Our results suggest that geographical and stratigraphic variations in sedimentary components (resedimented density-current deposits vs. oceanic pelagites), as well as overall grain size, of the subduction wedge can complicate Hf-Nd isotopic decoupling in resulting arc magmas. |
| WOS关键词 | REFERENCE MATERIALS BCR-1 ; IZU-BONIN-MARIANA ; WESTERN PACIFIC ; SM-ND ; SEA SEDIMENTS ; LU-HF ; ELEMENT ; ARC ; GEOCHEMISTRY ; PROVENANCE |
| 资助项目 | National Natural Science Foundation of China[41973014] ; National Natural Science Foundation of China[41876044] ; Research Start-up Project for Introduced Talent of Yunnan University[20190043] ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0202] ; Youth Innovation Promotion Association CAS[2019067] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000665206200047 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; Research Start-up Project for Introduced Talent of Yunnan University ; Research Start-up Project for Introduced Talent of Yunnan University ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Research Start-up Project for Introduced Talent of Yunnan University ; Research Start-up Project for Introduced Talent of Yunnan University ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Research Start-up Project for Introduced Talent of Yunnan University ; Research Start-up Project for Introduced Talent of Yunnan University ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Research Start-up Project for Introduced Talent of Yunnan University ; Research Start-up Project for Introduced Talent of Yunnan University ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/101981]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Pang, Chong-Jin; Wang, Xuan-Ce |
| 作者单位 | 1.Zhejiang Univ, Ocean Coll, Zhoushan, Peoples R China 2.CAS Ctr Excellence Life & Paleoenvironm, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 4.Changan Univ, Sch Earth Sci & Resources, Xian, Peoples R China 5.Yunnan Univ, Sch Earth Sci, Kunming, Yunnan, Peoples R China 6.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China 7.Guilin Univ Technol, Guangxi Key Lab Hidden Metall Ore Deposits Explor, Guilin, Peoples R China |
| 推荐引用方式 GB/T 7714 | Pang, Chong-Jin,Tian, Liyan,Wang, Xuan-Ce,et al. Decoupling of Hf-Nd Isotopes in Challenger Deep Sediments, Mariana Trench: Implications for Sedimentary Hf and Nd Recycling in Subduction Zones[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2021,126(6):20. |
| APA | Pang, Chong-Jin.,Tian, Liyan.,Wang, Xuan-Ce.,Zhang, Hanyu.,Wen, Shu-Nv.,...&Wu, Tao.(2021).Decoupling of Hf-Nd Isotopes in Challenger Deep Sediments, Mariana Trench: Implications for Sedimentary Hf and Nd Recycling in Subduction Zones.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,126(6),20. |
| MLA | Pang, Chong-Jin,et al."Decoupling of Hf-Nd Isotopes in Challenger Deep Sediments, Mariana Trench: Implications for Sedimentary Hf and Nd Recycling in Subduction Zones".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 126.6(2021):20. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。