| 宫贯乾,曹永强,杨爱远,王殿良,刘佩欣,张雯婧,赵宇田,伦辛涛.老挝他曲盆地固体钾盐矿床蒸发岩同位素特征及成矿指示意义[J].矿产勘查,2025,16(8):2038-2046 |
| 老挝他曲盆地固体钾盐矿床蒸发岩同位素特征及成矿指示意义 |
| Isotopic characteristics and metallogenic significance of evaporite of solid potassium salt deposit in Thakhek Basin, Laos |
| 投稿时间：2024-09-26 |
| DOI：10.20008/j.kckc.202508018 |
| 中文关键词: 他曲盆地 农波组 钾盐矿 同位素地球化学 物源示踪中图分类号:P59文献标志码:A文章编号:1674-7801(2025)08-2038-09 |
| 英文关键词: Thakhek Basin Nong Bok Formation potash deposit isotope geochemistry provenance tracing |
| 基金项目:本文受老挝甘蒙—沙湾拿吉省他曲—赛布里县固体钾盐矿普查项目(DK20230020)和老挝甘蒙省农波县农龙村地区固体钾盐矿详查项目(DK20230499)联合资助。 |
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| 中文摘要: |
| 老挝沙空那空盆地是世界上已知的最大的沉积型钾盐矿床之一，其中老挝中部他曲盆地在晚白垩世阶段沉积了完整的三层旋回型蒸发岩地层。本研究以沙空那空盆地东部他曲盆地内 ZKXX钻孔中农波组石盐岩、钾石盐矿、光卤石矿、石膏矿为研究材料，进行硼、锶、硫同位素组成特征分析，揭示了该地区钾盐矿的成因及其沉积环境。同位素分析结果表明，其中 δ11B、87Sr/86Sr、δ34S均与同期海相蒸发岩数据相近，表明老挝甘蒙地区钾盐矿为海相成因。此外，δ11B值表明在第二沉积阶段，海侵现象显著且持续时间较长，导致了较厚的含盐系地层的沉积。87Sr/86Sr比值的变化特征指示了陆源水的补给影响，反映出成矿过程中水体来源的复杂性。δ34S值表明这一时期的沉积环境可能处于氧化状态，进一步影响了矿物的种类和分布。通过对同位素组分的分析，本研究不仅为老挝沙空那空盆地钾盐矿的成因提供了重要的地质证据，也为理解其成矿环境和演化过程提供了新的视角，这些发现对未来的矿产资源勘探与开发具有重要的指导意义。 |
| 英文摘要: |
| The Sakon Nakong Basin in Laos is one of the largest known sedimentary potash deposits in the world, and the Thakhek Basin in central Laos deposited a complete three-layer cyclic evaporite stratum in the LateCretaceous stage. This study analyzes the boron, strontium, and sulfur isotope compositions of the ZKXX drill coresamples, which include halite, potash, carnallite, and gypsum from the Thakhek Basin, revealing the genesis andsedimentary environment of the region's potash deposits. The isotope analysis indicates that the δ11B, 87Sr/86Sr, and δ34S values are similar to those of contemporaneous marine evaporites, indicating that the potash deposit in the Ka-meng area of Laos are of marine origin. Additionally, the δ11B values indicate significant and prolonged marine trans-gressions during the second sedimentary phase, resulting in the deposition of thick saline strata. Variations in the87Sr/86Sr ratios imply the influence of continental water contributions, highlighting the complexity of water sourcesduring mineral formation. The δ34S values further suggest that the sedimentary environment during this period wasprimarily oxidative, which influenced the types and distribution of minerals. By analyzing these isotopic compo-nents, this study provides essential geological evidence for the genesis of the potash deposits in the Savannakhet Ba-sin and offers new insights into their formation environment and evolutionary processes. These findings hold signifi-cant implications for future exploration and development of mineral resources. |
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