An occurrence of metastable cristobalite in spodumene-hosted crystal-rich inclusions from Jiajika pegmatite deposit, China | |
Li, Jiankang1; Chou, I-Ming2![]() | |
2016-12-01 | |
发表期刊 | JOURNAL OF GEOCHEMICAL EXPLORATION
![]() |
卷号 | 171期号:2015页码:29-36 |
摘要 | Laser Raman spectroscopic analyses showed the occurrence of cristobalite, together with carbonic aqueous fluid phases, in the crystal-rich inclusions (CIs) hosted in spodumene in Jiajika pegmatite deposit, China. In these CIs, cristobalite always coexists with zabuyelite, and occasionally with other minerals, including calcite, spodumene, and possibly cookeite. The rare occurrences of cristobalite in plutonic rocks are commonly considered to be resulted from the lack of H2O, which was thought to be the catalyzer for the conversion of cristobalite to quartz. However, this assumption is not supported by our observed coexistence of cristobalite with aqueous fluid in the CIs of Jiajika pegmatite deposit. The results of microthermometric analyses showed that the carbonic aqueous fluids in CIs had salinities of less than 7 wt.% NaCl equivalent, in which the CO2 phase(s) occupied 60-80 vol.% with the bulk CO2 densities of near 0.70 g/cm(3). Therefore, the estimated internal pressure of CIs are between 200 and 290 MPa at the initial dissolving temperature of daughter minerals (cristobalite at -400 degrees C), much lower than the entrapment pressures of at least 440 MPa. The occurrences of cristobalite in CIs could be ascribed to (1) the pressure decrease within CIs from the entrapment pressures of greater than 440 MPa to 200-290 MPa at -400 degrees C, mainly resulted from the crystallization of zabuyelite, and (2) the extension of the cristobalite stability to low temperatures due to the presence of lithium and H2O in the inclusions. More study is needed for the formation mechanisms of cristobalite in plutonic rocks and the effect of H2O on the conversion of cristobalite to quartz. (C) 2015 Elsevier B.V. All rights reserved. |
文章类型 | Article |
关键词 | Cristobalite Crystal-rich Inclusion Pegmatite Jiajika Deposit |
WOS标题词 | Science & Technology ; Physical Sciences |
DOI | 10.1016/j.gexplo.2015.10.012 |
URL | 查看原文 |
收录类别 | SCI ; ISTP |
语种 | 英语 |
关键词[WOS] | FLUID INCLUSIONS ; GRANITIC PEGMATITES ; RAMAN-SPECTROSCOPY ; PHASE-TRANSITION ; SYSTEM ; CRYSTALLIZATION ; SILICA ; TRIDYMITE ; PRESSURE ; H2O |
WOS类目 | Geochemistry & Geophysics |
WOS记录号 | WOS:000388780200004 |
引用统计 | |
文献类型 | 期刊论文 |
版本 | 出版稿 |
条目标识符 | http://ir.idsse.ac.cn/handle/183446/1470 |
专题 | 深海科学研究部_深海极端环境模拟研究实验室 |
作者单位 | 1.Chinese Acad Geol Sci, MLR Key Lab Metallogeny & Mineral Assessment, Inst Mineral Resources, Beijing 100037, Peoples R China 2.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Sanya 572000, Hainan, Peoples R China |
推荐引用方式 GB/T 7714 | Li, Jiankang,Chou, I-Ming. An occurrence of metastable cristobalite in spodumene-hosted crystal-rich inclusions from Jiajika pegmatite deposit, China[J]. JOURNAL OF GEOCHEMICAL EXPLORATION,2016,171(2015):29-36. |
APA | Li, Jiankang,&Chou, I-Ming.(2016).An occurrence of metastable cristobalite in spodumene-hosted crystal-rich inclusions from Jiajika pegmatite deposit, China.JOURNAL OF GEOCHEMICAL EXPLORATION,171(2015),29-36. |
MLA | Li, Jiankang,et al."An occurrence of metastable cristobalite in spodumene-hosted crystal-rich inclusions from Jiajika pegmatite deposit, China".JOURNAL OF GEOCHEMICAL EXPLORATION 171.2015(2016):29-36. |
条目包含的文件 | ||||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
An occurrence of met(2055KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Li, Jiankang]的文章 |
[Chou, I-Ming]的文章 |
百度学术 |
百度学术中相似的文章 |
[Li, Jiankang]的文章 |
[Chou, I-Ming]的文章 |
必应学术 |
必应学术中相似的文章 |
[Li, Jiankang]的文章 |
[Chou, I-Ming]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
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。
修改评论