内蒙古巴音戈壁盆地塔木素碱矿Na-碳酸盐成因模式

戴朝成; 钟炽涛; 刘晓东; 向龙; 许亚鑫

doi:10.3799/dqkx.2022.447

Volume 49 Issue 4

Apr. 2024

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Dai Chaocheng, Zhong Chitao, Liu Xiaodong, Xiang Long, Xu Yaxin, 2024. Genetic Model of Na-Cabonate in Tamusu Trona Deposit, Bayingobi Basin, Inner Mongolia. Earth Science, 49(4): 1207-1223. doi: 10.3799/dqkx.2022.447

Citation:

Dai Chaocheng, Zhong Chitao, Liu Xiaodong, Xiang Long, Xu Yaxin, 2024. Genetic Model of Na-Cabonate in Tamusu Trona Deposit, Bayingobi Basin, Inner Mongolia. Earth Science, 49(4): 1207-1223. doi: 10.3799/dqkx.2022.447

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Genetic Model of Na-Cabonate in Tamusu Trona Deposit, Bayingobi Basin, Inner Mongolia

doi: 10.3799/dqkx.2022.447

1.
College of Earth Sciences, East China University of Technology, Nanchang 330013, China
2.
State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China

Received Date: 2022-07-18
Available Online: 2024-04-30
Publish Date: 2024-04-25

Abstract

Abstract

The Lower Cretaceous Bayingobi Formation in the Hari sag, Bayingobi basin, Inner Mongolia, is a typical carbonate-type alkaline lake during the depositional period, and a large amount of Na-carbonate minerals developed during the salinization of the basin. In this paper, electron probe, X-diffraction, carbon and oxygen isotope and laser Raman spectroscopy were carried out to analyze the layered, speckled and vein-like Na-carbonate minerals in the trona layers of the Bayingobi Formation. The Na-carbonate minerals in the trona layer are mainly composed of trona, nahcolite, shortite, eitelite and bradleyite, with a small amount of hydrothermal minerals such as pyrite, chabazite-Na, searlesite and albite. The results of carbon and oxygen isotope testings show that the Lower Cretaceous trona layers in the Bayingobi basin were formed in a closed alkaline lake environment, the Na-carbonate minerals were formed at a temperature range of 34-80 ℃ (average 57 ℃). Under control of exhalative deposition and evaporation, silicate minerals were first formed in the trona layers, and then dolomite and calcite were formed, after Ca²⁺ and Mg²⁺ were almost consumed, trona and nacholite were precipitated. With sufficient Na⁺ brought by the hydrotherm, the early formed dolomite and calcite underwent metasomatism to form dawsonite and dawsonite. Based on the comprehensive analysis of mineralogy and geochemistry, the Na-carbonate sedimentary model of alkaline lake is established, which is controlled by hydrothermal exhalation and evaporative deposition, it can provide a new idea for the exploration of trona deposit.
- Bayingobi basin,
- Bayingobi Formation,
- trona deposit,
- Na-carbonate,
- genetic model,
- ore deposit geology

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References(62)

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Genetic Model of Na-Cabonate in Tamusu Trona Deposit, Bayingobi Basin, Inner Mongolia

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