Serpentinization of peridotites from the southern Mariana forearc
文献类型：期刊论文
| 作者 | Wang, Xiaomei1,2; Zeng, Zhigang1; Chen, Junbing3 |
| 刊名 | PROGRESS IN NATURAL SCIENCE
 |
| 出版日期 | 2009-10-10 |
| 卷号 | 19期号:10页码:1287-1295 |
| 关键词 | Peridotite Serpentinization Mineral Chemistry Lizardite Mariana |
| ISSN号 | 1002-0071 |
| DOI | 10.1016/j.pnsc.2009.04.004 |
| 文献子类 | Article |
| 英文摘要 | A detailed petrologic and mineralogic study was carried out on serpentinized peridotites dredged from the southern landward slopes of the Mariana Trench, in order to reveal the serpentinization process of these unusual rocks and to identify the sole presence of the mineral lizardite. The constituent minerals of these southern Mariana forearc peridotites are olivine, amphibole and spinel, as well as serpentine, chlorite and talc. Compared with serpentinite seamounts, the serpentinized peridotites from the southern Mariana forearc are characterized by the absence of magnetite and brucite, and the common presence of talc; besides, the serpentine mineral variety is simplex, only lizardite. Combining mineral chemistry and mineral phase relationships, we conclude that (1) the absence of magnetite in the serpentinized peridotites is due to incomplete serpentinization, other than magnetite, the iron end-member in olivine forms Fe-rich brucite and Fe-rich serpentine; (2) brucite is not stable with high silica activity, reacting with later SiO(2)-rich fluid and then forming lizardite, leading to a lack of brucite in these serpentinized peridotites; (3) the occurrence of talc is the result of later SiO(2)-rich fluid reactions with lizardite; and (4) the reason for the sole occurrence of lizardite is that the temperature condition of our study area was not high enough for the formation of antigorite (which is stable at > 500 degrees C). Despite the broad overlap of lizardite and chrysotile in growth temperature, differences in the modes of occurrence of lizardite and chrysotile, such as the scarcity of H(2)O, low porosity and permeability, as well as the actual situation of initial serpentinization in the study area, result in the absolute prevalence of lizardite over chrysotile in the area. (C) 2009 National Natural Science Foundation of China and Chinese Academy of Sciences. Published by Elsevier Limited and Science in China Press. All rights reserved.; A detailed petrologic and mineralogic study was carried out on serpentinized peridotites dredged from the southern landward slopes of the Mariana Trench, in order to reveal the serpentinization process of these unusual rocks and to identify the sole presence of the mineral lizardite. The constituent minerals of these southern Mariana forearc peridotites are olivine, amphibole and spinel, as well as serpentine, chlorite and talc. Compared with serpentinite seamounts, the serpentinized peridotites from the southern Mariana forearc are characterized by the absence of magnetite and brucite, and the common presence of talc; besides, the serpentine mineral variety is simplex, only lizardite. Combining mineral chemistry and mineral phase relationships, we conclude that (1) the absence of magnetite in the serpentinized peridotites is due to incomplete serpentinization, other than magnetite, the iron end-member in olivine forms Fe-rich brucite and Fe-rich serpentine; (2) brucite is not stable with high silica activity, reacting with later SiO2-rich fluid and then forming lizardite, leading to a lack of brucite in these serpentinized peridotites; (3) the occurrence of talc is the result of later SiO2-rich fluid reactions with lizardite; and (4) the reason for the sole occurrence of lizardite is that the temperature condition of our study area was not high enough for the formation of antigorite (which is stable at > 500 degrees C). Despite the broad overlap of lizardite and chrysotile in growth temperature, differences in the modes of occurrence of lizardite and chrysotile, such as the scarcity of H2O, low porosity and permeability, as well as the actual situation of initial serpentinization in the study area, result in the absolute prevalence of lizardite over chrysotile in the area. (C) 2009 National Natural Science Foundation of China and Chinese Academy of Sciences. Published by Elsevier Limited and Science in China Press. All rights reserved. |
| 学科主题 | Multidisciplinary Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000270021300015 |
| 公开日期 | 2010-12-22 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/3705]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 3.Zhejiang Geol Prospecting Bur, Ningbo 315012, Zhejiang, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Xiaomei,Zeng, Zhigang,Chen, Junbing. Serpentinization of peridotites from the southern Mariana forearc[J]. PROGRESS IN NATURAL SCIENCE,2009,19(10):1287-1295. |
| APA | Wang, Xiaomei,Zeng, Zhigang,&Chen, Junbing.(2009).Serpentinization of peridotites from the southern Mariana forearc.PROGRESS IN NATURAL SCIENCE,19(10),1287-1295. |
| MLA | Wang, Xiaomei,et al."Serpentinization of peridotites from the southern Mariana forearc".PROGRESS IN NATURAL SCIENCE 19.10(2009):1287-1295. |
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来源：海洋研究所
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