| 罗布泊盐湖罗北凹地杂卤石沉积、分布特征及成因分析 |
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| 引用本文： | 马宝成,张华,颜辉,焦鹏程,刘成林,杨玉明,赵芝,赵亮亮,李东星,尹慧晶,袁苗,张凡凯,于咏梅,李文学,王江,王露莎.罗布泊盐湖罗北凹地杂卤石沉积、分布特征及成因分析[J].岩石矿物学杂志,2023,42(5):679-690. |
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| 作者姓名： | 马宝成 张华 颜辉 焦鹏程 刘成林 杨玉明 赵芝 赵亮亮 李东星 尹慧晶 袁苗 张凡凯 于咏梅 李文学 王江 王露莎 |
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| 作者单位： | 中国地质科学院 矿产资源研究所, 自然资源部成矿作用与资源评价重点实验室, 北京 100037;国投新疆罗布泊 钾盐有限责任公司, 新疆 哈密 839000;中国地质科学院 矿产资源研究所, 自然资源部成矿作用与资源评价重点实验室, 北京 100037;中国地质大学(北京), 北京 100083;中国地质科学院 矿产资源研究所, 自然资源部成矿作用与资源评价重点实验室, 北京 100037;东华理工大学, 江西 南昌 330013 |
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| 基金项目： | 国家自然科学基金项目(41972092);第三次新疆综合科学考察项目课题(2022xjkk1303);国投新疆罗布泊钾盐有限责任公司科技项目 |
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| 摘 要： | 采用岩石薄片鉴定、X射线衍射分析、扫描电镜以及元素地球化学等分析测试手段，对罗布泊盐湖罗北凹地杂卤石的沉积和分布特征进行了研究。结果显示，罗北凹地杂卤石主要发育于含盐系中上部，或以质地较纯的层状杂卤石岩产出，或与钙芒硝/石盐/白钠镁矾共同产出。杂卤石有交代和原生两种成因类型：前者是罗北凹地杂卤石产出的主要类型，是罗布泊硫酸盐型盐湖自身蒸发析出产物，在盐湖演化中后期交代钙芒硝或者石膏形成；后者可能为富钙卤水补给富钾镁盐湖形成。罗北凹地杂卤石的分布具有在南北方向上南厚北薄、在东西方向上中间厚两侧薄的特点，对应的KCl含量也同样具有南高北低、中间高两侧低的特点，它们的分布特征明显受控于区域构造活动，构造导致的沉降区有利于杂卤石聚集成矿。本区杂卤石矿埋藏浅、规模较大，可作为后备钾盐资源。
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| 关 键 词： | 杂卤石 钾盐 盐湖 罗布泊 |
| 收稿时间： | 2023/6/19 0:00:00 |
| 修稿时间： | 2023/8/8 0:00:00 |
The sedimentary, distribution and genesis analysis of polyhalite in the Luobei Sag of Lop Nur Salt Lake |
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| MA Bao-cheng,ZHANG Hu,YAN Hui,JIAO Peng-cheng,LIU Cheng-lin,YANG Yu-ming,ZHAO Zhi,ZHAO Liang-liang,LI Dong-xing,YIN Hui-jing,YUAN Miao,ZHANG Fan-kai,YU Yong-mei,LI Wen-xue,WANG Jiang,WANG Lu-sha.The sedimentary, distribution and genesis analysis of polyhalite in the Luobei Sag of Lop Nur Salt Lake[J].Acta Petrologica Et Mineralogica,2023,42(5):679-690. |
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| Authors: | MA Bao-cheng ZHANG Hu YAN Hui JIAO Peng-cheng LIU Cheng-lin YANG Yu-ming ZHAO Zhi ZHAO Liang-liang LI Dong-xing YIN Hui-jing YUAN Miao ZHANG Fan-kai YU Yong-mei LI Wen-xue WANG Jiang WANG Lu-sha |
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| Institution: | Ministry of Natural Resources Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Xin Jiang Luobupo Potash Co., LTD, State Development and Investment Corporation, Hami 839000, China;Ministry of Natural Resources Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;China university of geoscience, Beijing 100083, China;Ministry of Natural Resources Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;State Key Laboratory of Nuclear Resource and Environment, East China University of Technology, Nanchang 330013, China |
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| Abstract: | The sedimentary and distribution characteristics of polyhalite in the Luobei Sag of Lop Nur Salt Lake were studied using section identification, XRD, SEM, and elemental geochemistry. The results show that polyhalite in the Luobei Sag mainly develops in the middle-upper part of the salt-bearing series. It occurs as either pure-layered polyhalite rocks or in association with glauberite, halite or blodite. There are two origin of polyhalite: replaced and primary. The former is the main type in the Luobei Sag and formed through evaporation of the Lop Nur sulfate salt-type salt lake during the middle and later stages of evolution, with replacement of glauberite or gypsum. The latter may be formed by the enrichment of potassium-magnesium salts due to the supply of calcium-rich brine. The distribution of polyhalite in the Luobei Sag shows a characteristic of thicker in the south and thinner in the north in the south-north direction, and thicker in the middle and thinner on both sides in the east-west direction. The corresponding KCl content also present a similar pattern with higher values in the southern and middle parts, and lower values in the northern and on both sides. These distribution characteristics are clearly controlled by regional tectonic activity, where tectonic-induced subsidence areas are favorable for polyhalite accumulation and mineralization. The shallow burial and large scale of polyhalite deposits in this area make them a potential reserve of potassium salt resources. |
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| Keywords: | polyhalite potash salt lake Lop Nur |
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