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泰国—老挝境内的呵叻高原马哈萨拉堪组钾盐矿床是世界上最大的钾盐矿床之一。综合研究表明,马哈萨拉堪组赋钾蒸发岩形成于晚白垩世,其成盐物质来自海水。该含盐建造很可能形成于陆相环境中,为“海源陆相”沉积。在蒸发岩沉积过程中及沉积后,一直伴随着水—岩(盐)作用的发生,钾盐沉积之后往往受到该作用的改造。溢晶石的出现是该地区“异常”蒸发岩的表现特征之一,它的形成很可能与海水的变质作用有关,但其形成机制尚未得到合理解释。兰坪—思茅盆地勐野井组与呵叻高原马哈萨拉堪组联系密切且具有共同之处,但二者在时代、成盐期次对比等问题上存在较大争议。最后,针对今后该地区钾盐研究提出了一些新的研究思路与方法。
Thailand - Nakhon Ratchasima Plateau, Lao PDR Mahakala Ketai Potash Deposit is one of the largest potash deposits in the world. Comprehensive studies show that the Mahasalakan group K-evapotranspiration was formed in the Late Cretaceous and its salt-forming substance came from seawater. The salt formation is likely to be formed in the continental environment for the “marine terrestrial” deposition. During and after the deposition of evaporites, the water-rock interaction has been followed. After the deposition of potassium salts, it is often modified by this action. The occurrence of anaerobic sphene is one of the characteristics of “anomalous” evaporites in the area. Its formation is likely to be related to the metamorphism of seawater, but its formation mechanism has not been properly explained. The Lanping-Mengmai Formation in the Simao Basin is closely related to the Mahasalakan Formation in the Nkrat Plateau. However, there is much controversy over such issues as the times and the comparison of salt-forming periods. Finally, some new research ideas and methods are put forward for the future research on potash in the area.