Knowledge Management System Of Institute of Oceanology, Chinese Academy of Sciences
| Origin of high-Mg arc volcanism and fate of subducted sedimentary carbonates in the western Pacific: Evidence from partial melting experiments on mixed sediment and peridotite | |
| Zhan, Mingjun1,2; Zhang, Guoliang1,3,4 | |
| 2021-10-28 | |
| 发表期刊 | GEOLOGICAL JOURNAL
 |
| ISSN | 0072-1050 |
| 页码 | 15 |
| 通讯作者 | Zhang, Guoliang([email protected]) |
| 摘要 | Andesitic to rhyolitic arc volcanism commonly occurs in the cold subduction system in the modern western Pacific, however, their genesis remains debated. The high-Mg andesitic arc rocks with enrichments of Th and K are suggested to be derived from a contribution of the subducted sediments and the depleted mantle wedge. The partial melts of pure sediments have MgO too low to explain the origin of such high-Mg arc rocks. For a cold subduction system, melting of subducted slab can unlikely occur, while sediment diapirism serves as a possible mechanism to contribute to the origin of arc volcanism. Here, we conducted high-pressure experiments on the mixed sediment (+/- CaCO3) and peridotite with proportions of 7:3 and 5:5 at 3.5 GPa and 1000-1300 degrees C. The experiment resulted in andesitic to rhyolitic melts with elevated MgO and enriched K2O. All melts reduce in K2O with increasing temperatures as no K-rich minerals were produced. The interactions between carbonate-bearing sediments and peridotites during the diapirism promote decarbonation and produce melts with elevated MgO. The results of the experiments can explain the origin of high-Mg and K-rich andesite-rhyolite series of the Izu-Bonin-Mariana arc system. A higher sediment proportion used in the experiment is coupled with a stronger effect of garnet, which explains the volcanic rocks with higher K2O and La/Yb. We propose that sediment diapirism in the mantle wedge can produce high-Mg and K-rich andesitic-rhyolitic arc lavas and facilitate decarbonation of subducted sedimentary carbonates in the typical cold Izu-Bonin-Mariana subduction zone. |
| 关键词 | arc volcanism garnet effect sediment diapir sedimentary carbonate subduction zone |
| DOI | 10.1002/gj.4306 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[91858206]; Science & Technology Basic Resources Investigation Program of China[2017FY100801]; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050101]; Taishan Scholars Program of Shandong Province[tsqn201909157] |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000712023500001 |
| 出版者 | WILEY |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/177138 |
| 专题 | 深海极端环境与生命过程研究中心 |
| 通讯作者 | Zhang, Guoliang |
| 作者单位 | 1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 通讯作者单位 | 中国科学院海洋研究所; 中国科学院海洋大科学研究中心 |
| 推荐引用方式 GB/T 7714 | Zhan, Mingjun,Zhang, Guoliang. Origin of high-Mg arc volcanism and fate of subducted sedimentary carbonates in the western Pacific: Evidence from partial melting experiments on mixed sediment and peridotite[J]. GEOLOGICAL JOURNAL,2021:15. |
| APA | Zhan, Mingjun,&Zhang, Guoliang.(2021).Origin of high-Mg arc volcanism and fate of subducted sedimentary carbonates in the western Pacific: Evidence from partial melting experiments on mixed sediment and peridotite.GEOLOGICAL JOURNAL,15. |
| MLA | Zhan, Mingjun,et al."Origin of high-Mg arc volcanism and fate of subducted sedimentary carbonates in the western Pacific: Evidence from partial melting experiments on mixed sediment and peridotite".GEOLOGICAL JOURNAL (2021):15. |
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