基于矿物组成分析的昆特依盐湖杂卤石成因解析——以大盐滩矿区ZK3608孔为例
Genesis of Polyhalite in Kunteyi Salt Lake Based on Mineral Composition Analysis——Taking ZK3608 Borehole in Dayantan Mining Area as an Example
投稿时间:2018-12-10  修订日期:2019-01-11
DOI:
中文关键词:  昆特依盐湖,矿物组成,杂卤石,矿床成因,沉积环境
英文关键词:Kunteyi Salt Lake  mineral composition  Polyhalite  ore genesis  sedimentary environment
基金项目:国家自然科学(41672087),西部之光项目“柴达木盆地杂卤石矿层储集性能评价及最佳溶采区预测”。
作者单位邮编
张星 中国科学院青海盐湖研究所 810008
张西营 中国科学院青海盐湖研究所 810008
苗卫良 中国科学院青海盐湖研究所 
李雯霞 中国科学院青海盐湖研究所 
李俊 中国科学院青海盐湖研究所 
周同亮 中国科学院青海盐湖研究所 
吕学成 青海盐湖镁业有限公司 
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中文摘要:
      昆特依盐湖杂卤石储量丰富,是研究陆相成因杂卤石的良好载体。本研究对研究区ZK3608钻孔剖面进行矿物学分析,尝试从矿物组成及组合变化的角度揭示杂卤石的形成过程和机制。XRD结果表明,剖面中主要盐类矿物为石盐、石膏和杂卤石,此外还检测到六水泻盐、芒硝、无水芒硝、钾石盐、钾芒硝、菱镁矿等矿物。矿物组合及其剖面变化特征揭示,盐层中的杂卤石以原生沉积为主,碎屑层中则以交代成因为主。沉积环境分析表明,盐类沉积时为干冷的偏酸性氧化环境,碎屑沉积是为相对温湿的偏碱性还原环境。
英文摘要:
      Kunteyi Salt Lake is rich in polyhalite, which makes it a good carrier for studying continental polyhalite. Based on mineralogical analysis of ZK3608 core section in the study area, this study attempts to reveal the formation process and mechanism of polyhalite from the perspective of mineral composition and assemblage changes. The X-Ray diffraction results show that the main salt minerals in the profile include halite, gypsum and polyhalite. In addition, salt minerals such as hexahydrite, mirabilite, thenardite, sylvite, aphthitalite and magnesite were also detected. The mineral assemblages and their change characteristics with depth reveal that the polyhalites in salt beds are mainly primary deposits, while the polyhalite generated from metasomatism are mainly distributed in clastic layers. Sedimentary environment analysis shows that the salt deposits reflected a dry and cold acidic oxidation brine environment, while the debris deposits are formed in a relatively warm and humid alkaline reduction environment.
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