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老挝他曲盆地钾盐矿床蒸发岩硫 同位素特征及成钾指示意义
投稿时间:2014-04-22  修订日期:2014-06-05  点此下载全文
引用本文:张华,刘成林,王立成,方小敏.2014.老挝他曲盆地钾盐矿床蒸发岩硫 同位素特征及成钾指示意义[J].地质论评,60(4):851-857
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作者单位E-mail
张华 中国地质科学院矿产资源研究所北京100037 zhhcdut@163.com 
刘成林 1)中国地质科学院矿产资源研究所北京100037 2)国土资源部成矿作用与资源评价重点实验室北京100037  
王立成 中国地质科学院矿产资源研究所北京100037  
方小敏 中国科学院青藏高原研究所北京100101  
基金项目:本文为国家重点基础研究发展计划973项目(编号2011CB403007)及“十二五”国家科技支撑计划(编号2011BAB06B06)的成果。
中文摘要:老挝含盐盆地白垩纪时期位于新特提斯域东南部,晚白垩世沉积了巨型钾盐矿床。其中,万象东南部的他曲盆地钻孔含盐系中硬石膏δ34SV CDT值集中分布在138‰~153‰,与同期海相蒸发岩δ34S值近似,表明石膏为海相成因。据此,也进一步证实老挝含盐盆地成钾物质大多来自于同时期的古海水,但同时也受到大陆水的掺杂。依据老挝含盐盆地与思茅盆地钾盐矿床沉积时代相近,同时结合勐野井组石膏硫同位素组成,笔者初步认为两盆地在硫同位素组成上具有相近的海源特征,推断它们在海侵期可能曾连通。
中文关键词:硫同位素  特提斯域  海水  钾盐  老挝他曲盆地
 
Characteristics of Evaporites Sulfur Isotope from Potash Deposit in ThakhekBasin,Laos,and Its Implication for Potash Formation
NameInstitution
Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing,100037;
1)Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing,100037; 2) Key Laboratory of Metallogeny and Mineral Assessment,Ministry of Land and Resouces, Beijing,100037;
Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing,100037;
Institute of Qinghai—Xizang(Tibetan)Plateau Research,Chinese Academy of Science, Beijing,100101
Abstract:The Laos’s salt bearing Basin was located in the southeast of new Tethys domain during Cretaceous and hosted huge potash deposit during late Cretaceous. δ34SV CDT of anhydrite from borehole of Thakhek basin located in the southeastern Vientiane with value of 13.8‰~15.3‰ is similar to that of contemporaneous marine evaporites that indicated these anhydrites were with marine origin. These evidences further prove that the potassium materials in both the Laos’s salt bearing basin sourced from Cretaceous seawater with the mixture of fresh water from land. Combining with the update data that the time of potash deposition in both the Laos’s salt bearing basin and Simao basin was approximated and sulfur isotopic composition of Mengyejing Formation,we inferred that the sulfur isotopic composition in both the Laos’s salt bearing basin and Simao basin were consistent with that of contemporaneous sea water and proposed a preliminary scenario that the two basins were possibly connected when marine transgression happened.
keywords:sulfur isotope  Tethys domain  seawater  potash  Thakhek Basin,Laos
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