Decoupling between Oxygen and Radiogenic Isotopes: Evidence for Generation of Juvenile Continental Crust by Partial Melting of Subducted Oceanic Crust
文献类型：期刊论文
| 作者 | Wang, Xuan-Ce2,3; Li, Qiuli4; Wilde, Simon A.3,5,6; Li, Zheng-Xiang5,6; Li, Chaofeng; Lei, Kai2; Li, Shao-Jie3; Li, Linlin3; Pandit, Manoj K.1 |
| 刊名 | JOURNAL OF EARTH SCIENCE
 |
| 出版日期 | 2021-10-01 |
| 卷号 | 32期号:5页码:1212-1225 |
| 关键词 | zircon Hf-Nd and O isotopes decoupling slab melting Neoproterozoic continental crustal growth |
| ISSN号 | 1674-487X |
| DOI | 10.1007/s12583-020-1095-2 |
| 英文摘要 | There is increasing evidence indicating that melts derived from subducted oceanic crust and sediments may have played a key role in building continental crust. This mechanism predicts that juvenile arc crust should have oxygen isotope characteristics ranging from mantle-like to supracrustal, but consistent mantle-like radiogenic (Nd-Hf) isotopic signatures. Here we present in-situ zircon U-Pb dating, Hf-O isotope analyses, and whole rock major-trace element and Nd isotope analyses of a granitoid from NW India. In-situ secondary ion mass spectrometry (SIMS) zircon U-Pb dating yields a weighted mean Pb-207/Pb-206 age of 873 +/- 6 Ma for the granitoid. It displays mantle-like zircon epsilon(Hf)(epsilon(Hf(873 Ma))=+9.3 to +10.9) and whole-rock Nd (epsilon(Nd(873 Ma))=+3.5) values but supracrustal delta O-18 values, the latter mostly varying between 9 parts per thousand and 10 parts per thousand. The calculated whole-rock delta O-18 value of 11.3 parts per thousand +/- 0.6 parts per thousand matches well with those of hydrothermally-altered pillow lavas and sheeted dykes from ophiolites. The major and trace element composition of the granitoid is similar to petrological experimental melts derived from a mixture of MORB+sediments. Thus, the granitoid most likely represents the product of partial melting of the uppermost oceanic crust (MORB+sediments). We propose that the decoupling between Hf-Nd and O isotopes as observed in this granitoid can be used as a powerful tool for the identification of slab melting contributing to juvenile continental crustal growth. Such isotopic decoupling can also account for high delta O-18 values observed in ancient juvenile continental crust, such as Archean tonalite-trondhjemite-granodiorite suites. |
| WOS关键词 | DELHI OROGENIC BELT ; U-PB ; ZIRCON MEGACRYSTS ; BULK COMPOSITION ; VOLCANIC-ROCKS ; SOUTH CHINA ; NW INDIA ; LU-HF ; MANTLE ; EVOLUTION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000702994900015 |
| 出版者 | CHINA UNIV GEOSCIENCES, WUHAN |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102730]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Wang, Xuan-Ce |
| 作者单位 | 1.Univ Rajasthan, Dept Geol, Jaipur 302004, Rajasthan, India 2.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China 3.Yunnan Univ, Sch Earth Sci, Kunming 650500, Yunnan, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 5.Curtin Univ, Dept Appl Geol, Inst Geosci Res, Perth, WA 6845, Australia 6.Curtin Univ, Dept Appl Geol, ARC Ctr Excellence Core Crust Fluid Syst, Perth, WA 6845, Australia |
| 推荐引用方式 GB/T 7714 | Wang, Xuan-Ce,Li, Qiuli,Wilde, Simon A.,et al. Decoupling between Oxygen and Radiogenic Isotopes: Evidence for Generation of Juvenile Continental Crust by Partial Melting of Subducted Oceanic Crust[J]. JOURNAL OF EARTH SCIENCE,2021,32(5):1212-1225. |
| APA | Wang, Xuan-Ce.,Li, Qiuli.,Wilde, Simon A..,Li, Zheng-Xiang.,Li, Chaofeng.,...&Pandit, Manoj K..(2021).Decoupling between Oxygen and Radiogenic Isotopes: Evidence for Generation of Juvenile Continental Crust by Partial Melting of Subducted Oceanic Crust.JOURNAL OF EARTH SCIENCE,32(5),1212-1225. |
| MLA | Wang, Xuan-Ce,et al."Decoupling between Oxygen and Radiogenic Isotopes: Evidence for Generation of Juvenile Continental Crust by Partial Melting of Subducted Oceanic Crust".JOURNAL OF EARTH SCIENCE 32.5(2021):1212-1225. |
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。