IDSSE OpenIR  > 深海科学研究部  > 深海极端环境模拟研究实验室
An occurrence of metastable cristobalite in spodumene-hosted crystal-rich inclusions from Jiajika pegmatite deposit, China
Li, Jiankang1; Chou, I-Ming2
2016-12-01
Source PublicationJOURNAL OF GEOCHEMICAL EXPLORATION
Volume171Issue:2015Pages:29-36
AbstractLaser 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.
SubtypeArticle
KeywordCristobalite Crystal-rich Inclusion Pegmatite Jiajika Deposit
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.gexplo.2015.10.012
URL查看原文
Indexed BySCI ; ISTP
Language英语
WOS KeywordFLUID INCLUSIONS ; GRANITIC PEGMATITES ; RAMAN-SPECTROSCOPY ; PHASE-TRANSITION ; SYSTEM ; CRYSTALLIZATION ; SILICA ; TRIDYMITE ; PRESSURE ; H2O
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000388780200004
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/1470
Collection深海科学研究部_深海极端环境模拟研究实验室
Affiliation1.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
Recommended Citation
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.
Files in This Item: Download All
File Name/Size DocType Version Access License
An occurrence of met(2055KB)期刊论文作者接受稿开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Li, Jiankang]'s Articles
[Chou, I-Ming]'s Articles
Baidu academic
Similar articles in Baidu academic
[Li, Jiankang]'s Articles
[Chou, I-Ming]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Li, Jiankang]'s Articles
[Chou, I-Ming]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: An occurrence of metastable cristobalite in spodumene-hosted crystal-rich inclusions from Jiajika pegmatite deposit.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.