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Raman spectroscopic identification of cookeite in the crystal-rich inclusions in spodumene from the Jiajika lithium pegmatite deposit, China, and its geological implications
Ding, Xin1; Li, Jiankang2; Chou, I-Ming3; Chen, Zhenyu2; Li, Shenghu4
2020-01-16
Source PublicationEUROPEAN JOURNAL OF MINERALOGY
ISSN0935-1221
Volume32Issue:1Pages:67-75
Abstract

Cookeite usually occurs as a late alteration product in lithium-cesium-tantalum-type granitic pegmatite. Consequently, cookeite-bearing crystal-rich inclusions (CIs) in pegmatite are considered to be of secondary origin, which constrains our understanding of pegmatite formation. Thus far, no reported cookeite has produced a distinct Raman spectrum. However, the CIs hosted in spodumene in the Jiajika pegmatite deposit, China, contain a cookeite-like hydrous lithium-aluminum-silicate phase, yielding a distinct Raman spectrum. In electron microprobe analysis, focused ion beam scanning electron microscopy, and time-of-flight secondary ion mass spectrometry (ToF-SIMS), the average composition of this hydrous phase was determined as Li-10.005(Al3.997Fe0.018) (Si3.086Al0.914)O10.076OH7.902F0.098, close to the International Mineralogical Association (IMA) formula of cookeite, (Al, Li)(3)Al-2(Si, Al)(4)O-10(OH)(8). The distinct Raman peaks at 98, 167, 219, 266, 342, 382, 457, 592, 710, and 3640 cm(-1) were consistent with those of natural cookeite recrystallized in a hydrothermal diamond-anvil cell. The peaks were ascribed to the crystallization of cookeite from the liquid trapped in the closed space during the spodumene crystallization, which occurred at relatively high temperature and pressure without incorporating the minor elements commonly present during alteration processes. These minor elements often obscure the Raman signals, primarily by fluorescence effects. This type of cookeite in CIs with distinct Raman signals is unusual and can indicate whether the cookeite crystallized from fluid trapped within the closed space of a primary inclusion. In such a case, the fluid can be considered a flux-rich hydrous melt in pegmatite formation models.

DOI10.5194/ejm-32-67-2020
Indexed BySCI
Funding OrganizationNational Key Research and Development Program ; National Natural Science Foundation of China ; Chinese National Non-profit Institute Research Grant of CAGS ; Knowledge Innovation Program ; Hadal-trench Research Program ; Key Frontier Science Program, Chinese Academy of Sciences
Language英语
Funding ProjectNational Key Research and Development Program[2019YFC0605203] ; National Natural Science Foundation of China[41872096] ; Chinese National Non-profit Institute Research Grant of CAGS[JYYWF201814] ; Knowledge Innovation Program[SIDSSE-201302] ; Hadal-trench Research Program[XDB06060100] ; Key Frontier Science Program, Chinese Academy of Sciences[QYZDY-SSW-DQC008]
WOS KeywordCOMPLETE MISCIBILITY ; FLUID INCLUSIONS ; MELT INCLUSIONS ; SILICATE MELTS ; HYDROUS FLUIDS
WOS Research AreaMineralogy
WOS SubjectMineralogy
WOS IDWOS:000508178000003
PublisherE SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/7387
Collection深海科学研究部_深海极端环境模拟研究实验室
Corresponding AuthorLi, Jiankang
Affiliation1.China Univ Geosci Beijing, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.Chinese Acad Geol Sci, Inst Mineral Resources, MNR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China
3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, CAS Key Lab Expt Study Deep Sea Extreme Condit, Sanya 572000, Peoples R China
4.Shandong Inst Geol Sci, Jinan 250013, Peoples R China
Recommended Citation
GB/T 7714
Ding, Xin,Li, Jiankang,Chou, I-Ming,et al. Raman spectroscopic identification of cookeite in the crystal-rich inclusions in spodumene from the Jiajika lithium pegmatite deposit, China, and its geological implications[J]. EUROPEAN JOURNAL OF MINERALOGY,2020,32(1):67-75.
APA Ding, Xin,Li, Jiankang,Chou, I-Ming,Chen, Zhenyu,&Li, Shenghu.(2020).Raman spectroscopic identification of cookeite in the crystal-rich inclusions in spodumene from the Jiajika lithium pegmatite deposit, China, and its geological implications.EUROPEAN JOURNAL OF MINERALOGY,32(1),67-75.
MLA Ding, Xin,et al."Raman spectroscopic identification of cookeite in the crystal-rich inclusions in spodumene from the Jiajika lithium pegmatite deposit, China, and its geological implications".EUROPEAN JOURNAL OF MINERALOGY 32.1(2020):67-75.
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