Water Content and Hydrogen Isotopes of Olivine-Hosted Melt Inclusions in the Dali Picrites, SW China: Reassessing the Role of Water in the Formation of the Emeishan Large Igneous Province
文献类型：期刊论文
| 作者 | Chen, Qijing1,2,3; Ren, Zhong-Yuan2,3; Xia, Xiao-Ping2,3; Zhang, Le2,3; Yang, Qing2,3; Yuan, Chao2,3 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2023-11-01 |
| 卷号 | 128期号:11页码:15 |
| 关键词 | hydrogen isotopes melt inclusion picrite mantle plume Emeishan large igneous province |
| ISSN号 | 2169-9313 |
| DOI | 10.1029/2023JB027547 |
| 英文摘要 | The contribution of water to the formation of large igneous provinces (LIPs) remains controversial. We report the first measurement of water content and hydrogen isotope ratios in olivine-hosted melt inclusions from the Dali picrites, which belong to the Emeishan LIP (ELIP). The inclusions have a wide range of H2O content (0.01-1.73 wt %) and H isotope ratios (delta D = 87 +/- 11 parts per thousand to -267 +/- 14 parts per thousand). The lowest H isotope ratio is below that of the average mantle but comparable to that of the dehydrated slab. These results suggest that most of the Dali melt inclusions have undergone H+ diffusion and H2O degassing. However, some melt inclusions have higher H2O content and lower delta D value, which may have undergone rapid cooling and thereby preserved their magmatic H isotope and water content signatures. The reconstructed H2O content of the primary magma for the Dali picrites is similar to 1.35 wt %, much lower than the previous estimate for the ELIP primary magma (3.44 +/- 0.89 wt % or 4.0-5.6 wt %). Our results support a moderately hydrous (OIB-type) magma for the ELIP, instead of a highly hydrous one (arc-type). The mantle source of the picrites is calculated to contain 0.28-0.52 wt % H2O, and recycled oceanic crust that underwent seawater alteration and subsequent slab dehydration during subduction, causing the low delta D value of the melt inclusions. We suggest that the Dali picrites may have formed by partial melting of the recycled oceanic crust and metasomatized mantle peridotite. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001109340300001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/79189]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Xia, Xiao-Ping |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Ctr Excellence Deep Earth Sci, Guangzhou, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Qijing,Ren, Zhong-Yuan,Xia, Xiao-Ping,et al. Water Content and Hydrogen Isotopes of Olivine-Hosted Melt Inclusions in the Dali Picrites, SW China: Reassessing the Role of Water in the Formation of the Emeishan Large Igneous Province[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2023,128(11):15. |
| APA | Chen, Qijing,Ren, Zhong-Yuan,Xia, Xiao-Ping,Zhang, Le,Yang, Qing,&Yuan, Chao.(2023).Water Content and Hydrogen Isotopes of Olivine-Hosted Melt Inclusions in the Dali Picrites, SW China: Reassessing the Role of Water in the Formation of the Emeishan Large Igneous Province.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,128(11),15. |
| MLA | Chen, Qijing,et al."Water Content and Hydrogen Isotopes of Olivine-Hosted Melt Inclusions in the Dali Picrites, SW China: Reassessing the Role of Water in the Formation of the Emeishan Large Igneous Province".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 128.11(2023):15. |
入库方式： OAI收割
来源：广州地球化学研究所
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