[1]邹艳红,张武桥,毛先成.2021.胶东焦家金矿床成矿过程热液蚀变化学反应数值模拟.大地构造与成矿学,优先出版:001-18.doi:10.16539/j.ddgzyckx.2022.01.010
　ZOU Yanhong,ZHANG Wuqiao,MAO Xiancheng.2021.Numerical Simulation of Hydrothermal Alteration Chemical Reactions during Ore-forming Process in the Jiaojia Gold Deposit, Jiaodong Peninsula, China.Geotectonica et Metallogenia,优先出版:001-18.doi:10.16539/j.ddgzyckx.2022.01.010
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胶东焦家金矿床成矿过程热液蚀变化学反应数值模拟
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2021年优先出版
页码:
001-18
栏目:
出版日期:
2022-12-30

文章信息/Info

Title:
Numerical Simulation of Hydrothermal Alteration Chemical Reactions during Ore-forming Process in the Jiaojia Gold Deposit, Jiaodong Peninsula, China
作者:
邹艳红;  张武桥;  毛先成;  刘占坤
(1. 中南大学 有色金属成矿预测与地质环境监测教育部重点实验室, 湖南 长沙 410083; 2. 中南大学 地球科学与信息物理学院, 湖南 长沙 410083)
Author(s):
ZOU Yanhong;  ZHANG Wuqiao;  MAO Xiancheng;  LIU Zhankun
(1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, Hunan, China; 2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, Hunan, China)
关键词:
数值模拟;  焦家金矿床;  化学反应;  热液蚀变;  TOUGHREACT
Keywords:
numerical simulation;  Jiaojia gold deposit;  chemical reaction;  hydrothermal alteration;  TOUGHREACT
分类号:
P618.51, P628.3
DOI:
10.16539/j.ddgzyckx.2022.01.010
文献标志码:
A
摘要:
焦家金矿床是胶东金矿集区中典型的破碎带蚀变岩型金矿床, 存在明显的蚀变分带特征, 然而, 热液蚀变分带的形成条件及发生金沉淀化学反应的空间位置尚不够明确。本文利用TOUGHREACT软件对焦家金矿床含矿热液与围岩化学反应进行了模拟, 旨在定量探讨该矿床热液蚀变过程。通过分析含矿热液与围岩发生的化学反应, 构建热液蚀变成矿概念模型, 模拟计算不同温压条件下成矿流体组分化学平衡浓度以及pH值的变化, 研究成矿过程热液蚀变矿物的溶解与沉淀机制。模拟结果显示Au+的化学平衡浓度在温度从280 ℃降至180 ℃的过程中呈明显下降趋势, Fe2+化学平衡浓度与Au+呈现相似的变化趋势, 表明金矿物最佳成矿温度范围为180~280 ℃, 成矿流体中Fe2+与 [Au(HS)2]- 络合物发生置换还原反应, 促使金沉淀析出; 不同温度和压力条件对成矿元素化学平衡浓度变化影响表明, 温度是控制金沉淀化学反应的关键因素, 压力影响相对较小; 而 pH值模拟结果表明热液蚀变反应过程成矿流体pH值升高, 成矿环境从酸性环境逐渐转变为中性、碱性环境, 与传统地质手段分析结果一致, 验证了模拟结果的有效性。上述研究结果表明, 在温度驱动力作用下, 成矿流体沿断裂侧向运移与围岩持续叠加的蚀变作用, 形成了蚀变分带; 在紧靠断裂带下盘的黄铁绢英岩化带, 由于易发生多种蚀变的叠加以及成矿温度、pH值的变化, 有利于金的沉淀富集。
Abstract:
The Jiaojia gold deposit is one of the most typical altered-type gold deposits in the Jiaodong gold province, with a clear alteration zonation. However, it is still unclear for the formation conditions of hydrothermal alteration zonation and the spatial location of chemical reaction associated with gold precipitation. This paper used the TOUGHREACT software to simulate the chemical reaction between ore-bearing fluids and wall rocks of the Jiaojia gold deposit to quantitatively discuss the hydrothermal process. Firstly, we constructed a conceptual mineralization model related to hydrothermal alteration by discussing the chemical reaction between ore-bearing fluids and wall rocks. Subsequently, we simulated the chemical equilibrium concentration of ore-forming fluids and pH changes under different temperature and pressure conditions, which was used to study the dissolution and precipitation mechanism of hydrothermally minerals during ore-forming processes. The simulation results show that the chemical equilibrium concentration of Au+ significantly decreased with the temperature from 280 ℃ to 180 ℃, and the chemical equilibrium concentration of Fe2+ is also similar, indicating that the favorite gold metallogenic temperature range is 180 ℃ to 280 ℃, and Fe2+ in ore-forming fluids reacts with complex [Au(HS)2]- to promote gold precipitation. The influence of different temperature and pressure conditions on the changes of the chemical equilibrium concentration of ore elements shows that the temperature is the key factor of controlling gold precipitation, while the pressure influence is relatively weak. The pH simulation results show that the pH value of ore-forming fluids increased during the hydrothermal alteration reaction with the ore-forming environment changes from acidic to neutral and/or alkaline, which is consistent with the observation of traditional geological studies. This verified the validity of simulation results. The above results indicate that the lateral movement of ore-forming fluid along the fault resulted in the continuous overprinting alteration under the temperature driving. The pyrite-sericite-quartz alteration, located in the footwall of fault zone is conducive to gold precipitation and enrichment due to frequent overprinting of various alterations and changes of temperature and pH.

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备注/Memo

备注/Memo:
项目资助：国家自然科学基金项目(41872249、42030809)、湖南省科技创新计划项目(2021RC4055)和中南大学中央高校基本科研业务费专项资金(2021zzts0799)联合资助。
第一作者简介: 邹艳红(1971-), 女, 教授, 博士生导师, 主要从事三维地学建模与矿产资源定量预测研究与教学工作。E-mail: zouyanhong@csu.edu.cn
通信作者: 毛先成(1963-), 男, 教授, 博士生导师, 主要从事三维成矿预测的研究与教学工作。E-mail: mxc@csu.edu.cn
更新日期/Last Update: 2022-03-08