| 察尔汗盐湖矿物组合特征及其成因指示 |
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| 引用本文： | 弋嘉喜,樊启顺,魏海成,王明祥,秦占杰,袁秦,山发寿.察尔汗盐湖矿物组合特征及其成因指示[J].盐湖研究,2017,25(2):47-54. |
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| 作者姓名： | 弋嘉喜 樊启顺 魏海成 王明祥 秦占杰 袁秦 山发寿 |
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| 作者单位： | 中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海 西宁 810008;青海省盐湖地质与环境重点实验室, 青海 西宁 810008;中国科学院大学,北京101408,中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海 西宁 810008;青海省盐湖地质与环境重点实验室, 青海 西宁 810008,中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海 西宁 810008;青海省盐湖地质与环境重点实验室, 青海 西宁 810008,中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海 西宁 810008;青海省盐湖地质与环境重点实验室, 青海 西宁 810008,中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海 西宁 810008;青海省盐湖地质与环境重点实验室, 青海 西宁 810008;中国科学院大学,北京101408,中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海 西宁 810008;青海省盐湖地质与环境重点实验室, 青海 西宁 810008;中国科学院大学,北京101408,中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海 西宁 810008;青海省盐湖地质与环境重点实验室, 青海 西宁 810008 |
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| 基金项目： | 国家自然科学面上基金(41272274)和青海省科技厅应用基础研究项目(2016-ZJ-715)资助 |
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| 摘 要： | 察尔汗盐湖赋存有硫酸镁亚型和氯化物型两种水化学类型,沉积了中国最大的液体钾镁盐矿床。为解释察尔汗盐湖卤水矿床成因,拟在别勒滩、达布逊、察尔汗和霍布逊区段选择4个剖面,剖面深度在0~7 m之间,属于全新统上含盐组的上部盐层,每隔10cm进行采样,运用XRD半定量方法分析矿物组合特征。结果表明,整个湖区矿物组合由石盐、石膏、水氯镁石和碳酸盐组成,其平均含量分别为70%、4.7%、3.4%和1%;显示其矿物组合特征简单,盐层主要沉积石盐而贫石膏和碳酸盐矿物。同时,研究发现各区段石膏(硫酸盐矿物)平均含量自西向东明显下降,含镁矿物平均含量自西南向东北明显下降。结合察尔汗盐湖区卤水化学组成和水化学类型的分带,基本符合盐湖北部和东北部卤水富Ca~(2+),贫Mg~(2+)和SO_4~(2-)的沉积事实,进一步说明盐湖北部和东北部卤水和盐类沉积受具有氯化物型盐泉水的补给影响,为察尔汗盐湖混合掺杂成因提供了一定的矿物学证据。
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| 关 键 词： | 察尔汗盐湖 矿物组合 卤水特征 混合成因 |
| 收稿时间： | 2016/10/12 0:00:00 |
| 修稿时间： | 2016/10/31 0:00:00 |
The Characteristics of the Mineral Assemblage and the Forming Cluein Qarhan Salt Lake |
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| YI Jia-xi,FAN Qi-shun,WEI Hai-cheng,WANG Ming-xiang,QIN Zhan-jie,YUAN Qin and SHAN Fa-shou.The Characteristics of the Mineral Assemblage and the Forming Cluein Qarhan Salt Lake[J].Journal of Salt Lake Research,2017,25(2):47-54. |
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| Authors: | YI Jia-xi FAN Qi-shun WEI Hai-cheng WANG Ming-xiang QIN Zhan-jie YUAN Qin and SHAN Fa-shou |
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| Institution: | Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Xining,810008,China;Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Xining, 810008, China;University of Chinese Academy of Sciences,Beijing,100049,China,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Xining,810008,China;Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Xining, 810008, China,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Xining,810008,China;Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Xining, 810008, China,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Xining,810008,China;Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Xining, 810008, China,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Xining,810008,China;Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Xining, 810008, China;University of Chinese Academy of Sciences,Beijing,100049,China,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Xining,810008,China;Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Xining, 810008, China;University of Chinese Academy of Sciences,Beijing,100049,China and Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Xining,810008,China;Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Xining, 810008, China |
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| Abstract: | Qarhan Salt Lake contains two water types, namely the chloride type and Mg-sulfate type, and deposits the largest liquid potassium-magnesium salt deposits in China. In order to interpretate the origin of brine deposits in this playa, four profiles were selected in the four sections of Qarhan Salt Lake, respectively. The depth is in the range from 0 to 7.0 m and these sediments belong to Holocene salt group. We collected 180 samples with 10 cm interval in four porfilesand analyzed mineral assemblages by XRD method. The results show that total average concentration of halite, gypsum, bischofite and carbonate was more than 70%, 4.7% , 3.4% and less than 1%, respectively, which implies that the mineral assemblage was simple and mainly deposited halite and poor gypsum and carbonate minerals. At the same time, the study found that the average content of gypsum in each section from west to east obviously decreased, the average content of Mg-bearing minerals decreased from the southwest to the northeast part of Qarhan playa. Based on the characteristics of the brines in Qarhan Salt Lake, the fact that brines in the north and northeast part of Qarhan enrich Ca2+ and poor Mg2+ and SO42-, it further indicates that the brine and salt deposit in the north and northeast of Qarhan Salt Lake have received the supply from deep spring in order to offer the mineral evidence for the mixing theory. |
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| Keywords: | Qarhan Salt Lake Mineral assemblage Characteristics of brines Mixing theory |
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