投稿时间：2016-12-16
修订日期：2017-05-20
网络发布日期：2018-02-28
中文摘要:川东北早中三叠纪具备成盐成钾条件，黄金口背斜地区发现深部富钾卤水已经有近40年的历史，但是尚无对深层杂卤石的系统研究。近年，四川省启动了新一轮的找钾工作，并在黄金口背斜地区施工了钾盐探井，文章依托钻孔编录及测井资料，对该孔含盐系地层沉积特征进行了研究，并系统采集了3500 m以深的杂卤石、石盐、硬石膏等蒸发岩样品进行了分析测试。该孔杂卤石主要赋存于嘉陵江组五段二亚段与雷口坡组一段一亚段含盐地层中，可细分为4个成盐旋回，共发现杂卤石矿层8层，累计厚度33.5 m。该孔杂卤石主要呈薄层状产于硬石膏中，部分呈斑点状、团块状、薄层状产于石盐中，镜下呈半自形-他形粒状、板状、柱状结构，结合粉晶X衍射及扫描电镜观察，初步认为该孔杂卤石为原生沉积成因。
Abstract:Northeast Sichuan had conditions for potassium formation in early Triassic, and potassium rich brine was found in Huangjingkou anticline area about 40 years ago. Nevertheless, there has been no systematic research on deep polyhalite. A new round of looking for sylvine in Sichuan basin was started not long ago, and an exploratory well was constructed in Huangjingkou anticline. The authors studied the sedimentation characteristics of salt-bearing formation, and systematically collected and tested polyhalite, halite and anhydrite evaporation samples from the place deeper than 3500 m. Polyhalite occurs mainly in the salt-bearing formation of T1j5-2 and T2l1-1, and can be divided into four cycles of salt-forming stage. There are 8 layers of polyhalite, with the total thickness being 33.5 m. The polyhalites in this well mainly occur in anhydrite in the thin-bedded form, and parts of them occur in halite in the spotted, lumpy and thin-bedded forms, characterized by subhedral-anhedral granular, platy and columnar textures under the microscope. Combined with the observation of the X-ray diffraction and scanning electron microscopy, it is tentatively considered that the polyhalite in this well is mainly of depositional genesis.
文章编号：
中图分类号：578.3+2
文献标志码：
基金项目:本文得到四川省地勘基金项目"四川省宣汉县黄金口钾盐普查"和中国地质调查局项目（编号：1212010011810）联合资助
引用文本：
仲佳爱,郑绵平,唐学渊,刘铸,王富明,蔡策,庞博.2018.川东北黄金口背斜三叠系深部杂卤石特征及成因探讨[J].矿床地质,37(1):81~90ZHONG JiaAi,ZHENG MianPing,TANG XuanYuan,LIU Zhu,WANG FuMing,CAI Ce,PANG Bo.2018.Sedimentary characteristics and genetic study of deep polyhalite in Huangjingkou anticline of northeast Sichuan[J].Mineral Deposits37(1):81~90
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