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Variation of gypsum morphology along deep core SG-1, western Qaidam Basin (northeastern Tibetan Plateau) and its implication to depositional environments
Li, J (Li, Jiao)1,2,3; Li, MH (Li, Minghui)1,4; Fang, XM (Fang, Xiaomin)1,2,5; Wang, ZR (Wang, Zhengrong)6; Zhang, WL (Zhang, Weilin)1,2,5; Yang, YB (Yang, Yibo)1,2,5; Li, J; Li, MH
Source PublicationQUATERNARY INTERNATIONAL
2017
Volume430Issue:0Pages:71-81
DOI10.1016/j.quaint.2015.12.102
AbstractThe Qaidam Basin is an arid, closed, intermontane basin located on the northern margins of the Tibetan Plateau in China. A 938.5 m-long core (SG-1), dated between similar to 2.8 Ma-0.1 Ma, was obtained from the western Qaidam Basin. Gypsum is one of major evaporative minerals in the core. A total of 201 gypsum samples were selected and their crystal morphologies were carefully investigated. The crystal habits are lenticular, prismatic, tabular, twinned, stubby, and aggregate. Prismatic crystals occur in the upper 723 m, while lenticular crystals exist almost entirely in the upper 523 m. Tabular crystals are the most common morphology. The total abundance of gypsum crystal (including tabular, lenticular, and prismatic forms) tends to increase with decreasing depth. The relationship between crystal habits and depositional environments is complex, because same morphology can appear in different environments, and different morphologies can also occur in the same depositional environment. However, the occurrence of different morphologies can be attributed to the variable growth rates caused by the inhibition effect of additional cations (e.g. Mg2+, Na+, K+ and Sr2+) on particular lattice parameters and the variation in precipitation experiments.
The lattice parameters of the unit cell of gypsum, measured by X-ray diffraction method, are: a = 5.854-12.57 angstrom; b = 9.654-16.231 angstrom; and c = 5.163-14.024 angstrom; beta = 113.54-119.88 degrees; Volume = 601.55-712.65 angstrom(3). The substitution of K+, Na+ and Mg2+ for Ca2+ can reduce c-axis, while Sr2+ can reduce a and b axes. a/c, b/c, a/b tend to increase with K+, Na+ and Mg2+ and decrease with Sr2+. The Mg2+, Na+, K+ and Sr2+ contents in gypsum show significant variability, with K/Ca molar ratios varying from 1.03 x 10(-4) to 32.08 x 10(-4), Mg/Ca molar ratios from 0.0023 to 0.1629, Na/Ca molar ratios from 0.031 to 0.575, and Sr/Ca molar ratios from 5.59 x 10(-4) to 19.67 x 10(-4). Sr2+, Mg2+, Na+, and K+ concentrations in gypsum mainly depend on growth rate and brine concentration. (C) 2016 Elsevier Ltd and INQUA. All rights reserved.
Subject Area地质学
WOS IDWOS:000397933600009
Language英语
Indexed BySCI
KeywordCALCIUM-SULFATE DIHYDRATE QUATERNARY LACUSTRINE NEUTRON-DIFFRACTION CRYSTAL MORPHOLOGY EVAPORITE MINERALS SOUTH-AUSTRALIA M SEDIMENTS LONG CORE SALT LAKE DRY LAKE
WOS Research AreaPhysical Geography; Geology
WOS SubjectGeography, Physical; Geosciences, Multidisciplinary ; Physical Geography; Geology
Cooperation Status国际
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8333
Collection图书馆
Corresponding AuthorLi, J; Li, MH
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China.
2.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China.
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
4.Chinese Acad Sci, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China.
5.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China.
6.CUNY City Coll, Dept Earth & Atmospher Sci, New York, NY 10031 USA.
Recommended Citation
GB/T 7714
Li, J ,Li, MH ,Fang, XM ,et al. Variation of gypsum morphology along deep core SG-1, western Qaidam Basin (northeastern Tibetan Plateau) and its implication to depositional environments[J]. QUATERNARY INTERNATIONAL,2017,430(0):71-81.
APA Li, J .,Li, MH .,Fang, XM .,Wang, ZR .,Zhang, WL .,...&Li, MH.(2017).Variation of gypsum morphology along deep core SG-1, western Qaidam Basin (northeastern Tibetan Plateau) and its implication to depositional environments.QUATERNARY INTERNATIONAL,430(0),71-81.
MLA Li, J ,et al."Variation of gypsum morphology along deep core SG-1, western Qaidam Basin (northeastern Tibetan Plateau) and its implication to depositional environments".QUATERNARY INTERNATIONAL 430.0(2017):71-81.
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