碳酸盐岩热储中稀土元素的地球化学行为及其指示意义：以施甸地热系统为例

张晓博; 郭清海; 张梦昭; 孙伟浩; 李鑫

doi:10.3799/dqkx.2022.323

Volume 48 Issue 3

Mar. 2023

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Zhang Xiaobo, Guo Qinghai, Zhang Mengzhao, Sun Weihao, Li Xin, 2023. Geochemical Behavior and Indicative Effect of REEs in Carbonate Geothermal Reservoir: A Case of Shidian Geothermal System. Earth Science, 48(3): 908-922. doi: 10.3799/dqkx.2022.323

Citation:

Zhang Xiaobo, Guo Qinghai, Zhang Mengzhao, Sun Weihao, Li Xin, 2023. Geochemical Behavior and Indicative Effect of REEs in Carbonate Geothermal Reservoir: A Case of Shidian Geothermal System. Earth Science, 48(3): 908-922. doi: 10.3799/dqkx.2022.323

Citation:

Zhang Xiaobo, Guo Qinghai, Zhang Mengzhao, Sun Weihao, Li Xin, 2023. Geochemical Behavior and Indicative Effect of REEs in Carbonate Geothermal Reservoir: A Case of Shidian Geothermal System. Earth Science, 48(3): 908-922. doi: 10.3799/dqkx.2022.323

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Geochemical Behavior and Indicative Effect of REEs in Carbonate Geothermal Reservoir: A Case of Shidian Geothermal System

doi: 10.3799/dqkx.2022.323

Zhang Xiaobo^{1, 2
,
,},
Guo Qinghai^{1, 2
,
,},
Zhang Mengzhao^{1, 2},
Sun Weihao^{1, 2},
Li Xin^{1, 2}

1.
Key Laboratory of Deep Geothermal Resources, MNR, China University of Geosciences, Wuhan 430078, China
2.
School of Environmental Studies, China University of Geosciences, Wuhan 430078, China

Received Date: 2022-04-25
Available Online: 2023-03-27
Publish Date: 2023-03-25

Abstract

Abstract

Shidian medium-low temperature geothermal system, which has a complicated reservoir structure due to the intense tectonic movement, is a critical part of the Yunnan–Sichuan-Tibet geothermal Province (YST) with few studies focusing on it. The goal of this research is to study the geochemical behavior of the rare earth elements (REEs) in the Shidian geothermal system in order to reveal the dominant hydrogeochemical processes in the carbonate geothermal reservoir. The results in this study show that most of the geothermal fluids are rich in LREEs, indicating an inheritance of REEs feature from the host rocks. The geothermal fluids also have Cerium (Ce), Europium (Eu) and Yttrium (Y) anomalies. Among which, the negative Ce anomalies are probably the result of interaction between geothermal water and carbonate rock or an indicator of paleo-oxic conditions. The positive Eu anomalies are ascribed to the dissolution of feldspar minerals, while the positive Y anomalies are caused by the preferential adsorption of Ho on carbonates during the transport of geothermal fluids. The calculation by PHREEQC shows that the dominant species of REEs in geothermal fluid are LnCO₃⁺ and Ln(CO₃)₂^‒. The content of LnCO₃⁺ decreases with the increasing atomic number, in contrast, Ln(CO₃)₂^‒ increases with the increasing atomic number. In addition, there are still some Ln³⁺, LnF²⁺, LnHCO₃²⁺ and LnSO₄⁺ species with small amount in the geothermal fluid, which are controlled by the pH of water as well as F^‒, HCO₃^‒, and SO₄^2‒ content. REEs can provide important evidence for studying the hydrogeochemical processes in a geothermal system.
- REEs,
- carbonate rock,
- water-rock interaction,
- Shidian geothermal system,
- geochemistry

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