气候变化领域集成服务门户(CCPortal): The formation process of the Mengyejing potash deposit, Yunnan, China: evidence from geochemical and petrological characteristics

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DOI	10.1007/s12303-020-0042-7
	The formation process of the Mengyejing potash deposit, Yunnan, China: evidence from geochemical and petrological characteristics
	Shen, Lijian; Liu, Chenglin; Zhao, Jian-xin; Feng, Yuexing; Wang, Licheng
通讯作者	Shen, LJ (通讯作者)
发表日期	2021
ISSN	1226-4806
EISSN	1598-7477
起始页码	619
结束页码	633
卷号	25 期号:5
英文摘要	Two types of potash ores were sampled from the Mengyejing potash deposit (the MPD) which is the only ancient potash deposit ever found in China. Geochemical analyses, including Br, K, Mg and some heavy metals, were performed on those samples. The relatively consistent Br contents (141.42 to 763.67 ppm) in both bedded potash and veined potash ores show that the potash-forming brine was likely derived from seawater. K contents and Br/Cl ratios of the veined potash ores are relatively high in contrast to bedded potash ores. The K/Br ratios of veined potash ores exhibit a positive correlation with Br contents, which is opposite to that of the bedded potash ore of the MPD and potassium-salts from the evaporation of modern seawater. The contents of heavy metals in veined potash ores are much higher than those of bedded potash ores in the MPD and potash in other evaporite basins of the world. Sr and S isotopic compositions of these two types of potash ores suggest that the brines for precipitating veined potash were formed by mixing of connate waters (seawater or/and continental freshwater) and hydrothermal fluids. The geochemical and petrological characteristics of the veined potash ores indicate that the brine for forming veined potash orebodies caused by dissolution of previous bedded potash orebodies by hydrothermal fluids. The veined potash orebodies were formed through a cooling process by which sylvite precipitated first prior to halite.
关键词	LANPING-SIMAO BASIN HEAVY-METALS EVAPORITES MARINE EVOLUTION SEAWATER ORIGIN SULFUR EVAPORATION SEQUENCE
英文关键词	The Mengyejing potash deposit; Br geochemistry; heavy metals; petrography; ore-forming process
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000599033700003
来源期刊	GEOSCIENCES JOURNAL
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/260252
推荐引用方式 GB/T 7714	Shen, Lijian,Liu, Chenglin,Zhao, Jian-xin,et al. The formation process of the Mengyejing potash deposit, Yunnan, China: evidence from geochemical and petrological characteristics[J]. 中国科学院青藏高原研究所,2021,25(5).
APA	Shen, Lijian,Liu, Chenglin,Zhao, Jian-xin,Feng, Yuexing,&Wang, Licheng.(2021).The formation process of the Mengyejing potash deposit, Yunnan, China: evidence from geochemical and petrological characteristics.GEOSCIENCES JOURNAL,25(5).
MLA	Shen, Lijian,et al."The formation process of the Mengyejing potash deposit, Yunnan, China: evidence from geochemical and petrological characteristics".GEOSCIENCES JOURNAL 25.5(2021).