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DOI	10.1007/s13146-020-00660-y
	Hydrated sulfate minerals (bloedite and polyhalite): formation and paleoenvironmental implications
	Li, Minghui; Fang, Xiaomin; Galy, Albert; Wang, Huiling; Song, Xiangsuo; Wang, Xiaoxiao
通讯作者	Li, MH (通讯作者)
发表日期	2020
ISSN	0891-2556
EISSN	1878-5212
卷号	35 期号:4
英文摘要	Salt minerals that are used to reconstruct paleoenvironments should be either primary or samples that provide primary-level information. Using hydrated sulfate minerals that are commonly found in saline lacustrine sediments (i.e., bloedite and polyhalite), the paleoenvironment of the Qaidam Basin, in the northeastern Tibetan Plateau was reconstructed. In this study, we determined the primary and secondary mineral formations based on their S, Mg, H, and O isotopic compositions. While polyhalite is a secondary mineral, bloedite precipitated out from the brine at 0.39 Ma, and ultimately became a secondary mineral at 0.36 Ma. The bloedite and polyhalite Mg isotopes did not record primary signals, but they still provide valuable insights into the paleoenvironments in which they formed. The climate in our study area is very dry; based on the temperature of the brine, this region experienced high temperatures at 0.39 Ma, 0.36 Ma, and 0.12 Ma. We identified one major chemical inconsistency: the bloedite O-18-(hydrated water) and O-18-(SO4) values had basically achieved equilibrium, while the polyhalite and gypsum exhibited no oxygen exchange between their SO4 and hydrated water components. The possible reason for the inconsistency was the differences in mineral crystal structures. We hope that future studies will reconcile this conflicting information.
关键词	WESTERN QAIDAM BASIN NE TIBETAN PLATEAU MAGNESIUM ISOTOPE FRACTIONATION DEEP CORE SG-1 EVAPORITE MINERALS TECTONIC UPLIFT M SEDIMENTS SULFUR GYPSUM WATER
英文关键词	Magnesium isotopes; Sulfur isotopes; Oxygen and hydrogen isotopes; Salt minerals
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000586802300001
来源期刊	CARBONATES AND EVAPORITES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260037
推荐引用方式 GB/T 7714	Li, Minghui,Fang, Xiaomin,Galy, Albert,et al. Hydrated sulfate minerals (bloedite and polyhalite): formation and paleoenvironmental implications[J]. 中国科学院青藏高原研究所,2020,35(4).
APA	Li, Minghui,Fang, Xiaomin,Galy, Albert,Wang, Huiling,Song, Xiangsuo,&Wang, Xiaoxiao.(2020).Hydrated sulfate minerals (bloedite and polyhalite): formation and paleoenvironmental implications.CARBONATES AND EVAPORITES,35(4).
MLA	Li, Minghui,et al."Hydrated sulfate minerals (bloedite and polyhalite): formation and paleoenvironmental implications".CARBONATES AND EVAPORITES 35.4(2020).