Genesis of the Dawadi potassium nitrate deposit in Lop Nor, China

Abstract Nitrate deposits are rare worldwide, especially potassium nitrate deposits; furthermore, their genesis remains disputed. There is a rare salt-lake type potassium nitrate deposit in the Dawadi area of Lop Nor at the eastern margin of the Tarim Basin, and the ore bodies show coexisting solid...

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Autores principales:	Yu Zhang, Lichun Ma, Kai Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/54c468ab5526487c9b0b746993c41a32
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spelling	oai:doaj.org-article:54c468ab5526487c9b0b746993c41a322021-11-14T12:22:45ZGenesis of the Dawadi potassium nitrate deposit in Lop Nor, China10.1038/s41598-021-01278-32045-2322https://doaj.org/article/54c468ab5526487c9b0b746993c41a322021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01278-3https://doaj.org/toc/2045-2322Abstract Nitrate deposits are rare worldwide, especially potassium nitrate deposits; furthermore, their genesis remains disputed. There is a rare salt-lake type potassium nitrate deposit in the Dawadi area of Lop Nor at the eastern margin of the Tarim Basin, and the ore bodies show coexisting solid and liquid phases. Additionally, there are large sulphate-type potash deposits in the adjoining Luobei Depression, south of the Dawadi area. To determine why there are two different types of potash deposits in adjacent depressions with similar climates, field geological surveys were conducted and samples collected. It was found that the Tertiary clastic layer at the periphery of the Dawadi deposit was rich in high-salinity brine, with nitrate contents of up to 495–16,719 mg/L, much higher than those in the Luobei Depression, 1–35 mg/L. Additionally, a type of deep hydrothermal (Ca–Cl) brine was found in the fault zones, with nitrate contents of up to 8044 mg/L, dozens of times greater than that of ordinary groundwater. Using comprehensive analysis and research, we concluded that the Dawadi and Luobei depressions belong to different hydrological systems with no connection between them; thus, the two deposits belong to different metallogenic systems. Furthermore, groundwater played an important role in the mineralization of the potassium nitrate deposit, and a deep source may have been an important source of the ore-forming materials. The fault system widely developed in Lop Nor provides favorable channels for deep hydrothermal recharge, and the groundwater and deep hydrothermal brine could provide the source for the nitrate mineralization in the Dawadi Depression through water–rock reactions.Yu ZhangLichun MaKai WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yu Zhang Lichun Ma Kai Wang Genesis of the Dawadi potassium nitrate deposit in Lop Nor, China
description	Abstract Nitrate deposits are rare worldwide, especially potassium nitrate deposits; furthermore, their genesis remains disputed. There is a rare salt-lake type potassium nitrate deposit in the Dawadi area of Lop Nor at the eastern margin of the Tarim Basin, and the ore bodies show coexisting solid and liquid phases. Additionally, there are large sulphate-type potash deposits in the adjoining Luobei Depression, south of the Dawadi area. To determine why there are two different types of potash deposits in adjacent depressions with similar climates, field geological surveys were conducted and samples collected. It was found that the Tertiary clastic layer at the periphery of the Dawadi deposit was rich in high-salinity brine, with nitrate contents of up to 495–16,719 mg/L, much higher than those in the Luobei Depression, 1–35 mg/L. Additionally, a type of deep hydrothermal (Ca–Cl) brine was found in the fault zones, with nitrate contents of up to 8044 mg/L, dozens of times greater than that of ordinary groundwater. Using comprehensive analysis and research, we concluded that the Dawadi and Luobei depressions belong to different hydrological systems with no connection between them; thus, the two deposits belong to different metallogenic systems. Furthermore, groundwater played an important role in the mineralization of the potassium nitrate deposit, and a deep source may have been an important source of the ore-forming materials. The fault system widely developed in Lop Nor provides favorable channels for deep hydrothermal recharge, and the groundwater and deep hydrothermal brine could provide the source for the nitrate mineralization in the Dawadi Depression through water–rock reactions.
format	article
author	Yu Zhang Lichun Ma Kai Wang
author_facet	Yu Zhang Lichun Ma Kai Wang
author_sort	Yu Zhang
title	Genesis of the Dawadi potassium nitrate deposit in Lop Nor, China
title_short	Genesis of the Dawadi potassium nitrate deposit in Lop Nor, China
title_full	Genesis of the Dawadi potassium nitrate deposit in Lop Nor, China
title_fullStr	Genesis of the Dawadi potassium nitrate deposit in Lop Nor, China
title_full_unstemmed	Genesis of the Dawadi potassium nitrate deposit in Lop Nor, China
title_sort	genesis of the dawadi potassium nitrate deposit in lop nor, china
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/54c468ab5526487c9b0b746993c41a32
work_keys_str_mv	AT yuzhang genesisofthedawadipotassiumnitratedepositinlopnorchina AT lichunma genesisofthedawadipotassiumnitratedepositinlopnorchina AT kaiwang genesisofthedawadipotassiumnitratedepositinlopnorchina
_version_	1718429225813278720

Genesis of the Dawadi potassium nitrate deposit in Lop Nor, China

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