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Observations on the crystallization of spodumene from aqueous solutions in a hydrothermal diamond-anvil cell
Li, J.1; Chou, I. -M.2,3; Yuan, S.1; Burruss, R. C.2
2013-11-01
Source PublicationGEOFLUIDS
Volume13Issue:4Pages:467-474
AbstractCrystallization experiments were conducted in a new type of hydrothermal diamond-anvil cell (HDAC; type V) using LiAlSi2O6 (S) gel and H2O (W) as starting materials. A total of 21 experiments were performed at temperatures up to 950 degrees C and pressures up to 788 MPa. In the samples with relatively low W/S ratios, many small crystals formed in the melt phase during cooling. In those with high W/S ratios, only a few crystals with smooth surfaces crystallized from the aqueous fluid in the presence of melt droplets, which were gradually consumed during crystal growth, indicating rapid transfer of material from the melt to the crystals through the aqueous fluid. The nucleation of crystals started at 710 (+/- 70)degrees C and 520 (+/- 80) MPa, and crystal growth ended at 570 (+/- 40)degrees C and 320 (+/- 90) MPa, with the cooling P-T path within the stability field of spodumene+quartz in the S-W system. The observed linear crystal growth rates in the aqueous phase, calculated by dividing the maximum length of a single crystal by the duration of the entire growth step, were 4.7x10(-6) and 5.7x10(-6) cm s(-1) for the cooling rates of 0.5 and 1 degrees C min(-1), respectively. However, a rapid crystal growth rate of 3.6x10(-5)cm s(-1) in the aqueous fluid was observed when the components were supplied by nearby melt droplets. Our results show that when crystals nucleate in the aqueous fluid instead of the melt phase, there are fewer nuclei formed, and they grow much faster due to the low viscosity of the aqueous fluid, which accelerates diffusion of components for the growth of crystals. Therefore, the large crystals in granitic pegmatite can crystallize directly from aqueous fluids rather than hydrosilicate melt.
SubtypeArticle
KeywordAqueous Solution Crystallization Medium Hydrothermal Diamond-anvil Cell Pegmatite
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1111/gfl.12048
Indexed BySCI
Language英语
WOS KeywordGRANITIC PEGMATITES ; COUNTY ; NUCLEATION ; CALIFORNIA ; TEXTURES ; GENESIS ; GROWTH ; SYSTEM ; MODEL
WOS SubjectGeochemistry & Geophysics ; Geology
WOS IDWOS:000326185200008
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/743
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, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China
2.US Geol Survey, Natl Ctr, Reston, VA 22092 USA
3.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Lab Expt Study Under Deep Sea Extreme Condit, Sanya, Peoples R China
Recommended Citation
GB/T 7714
Li, J.,Chou, I. -M.,Yuan, S.,et al. Observations on the crystallization of spodumene from aqueous solutions in a hydrothermal diamond-anvil cell[J]. GEOFLUIDS,2013,13(4):467-474.
APA Li, J.,Chou, I. -M.,Yuan, S.,&Burruss, R. C..(2013).Observations on the crystallization of spodumene from aqueous solutions in a hydrothermal diamond-anvil cell.GEOFLUIDS,13(4),467-474.
MLA Li, J.,et al."Observations on the crystallization of spodumene from aqueous solutions in a hydrothermal diamond-anvil cell".GEOFLUIDS 13.4(2013):467-474.
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