云南兰坪—思茅盆地勐野井钾盐矿床盐构造特征及成因机制

Salt Structural Features and Genetic Mechanism of the Mengyejing  Sylvite Deposit in Lanping-Simao Basin, Yunnan

中文关键词:  勐野井钾盐矿床  盐构造  成因机制  构造挤压  重力滑移  差异负载

英文关键词:Mengyejing sylvite deposit  Salt structure  Genetic mechanism  Tectonic compression  Gravity sliding  Differences in load1-6301683。

中文摘要:

      云南兰坪—思茅盆地南部勐野井钾盐矿床沉积了巨厚的钾石盐,岩盐层整体呈现盐构造特征,且发育较强,多期褶皱频出,与上覆碎屑岩之间呈不整合或假整合接触。在喜马拉雅运动造成的强烈挤压和差异负载作用及盆地升降过程中的重力滑移作用下,岩盐形成较为复杂的盐构造体系。研究表明勐野井钾盐矿床盐构造受多重作用影响,重力滑移作用是盐构造初始动力来源,之后在差异负载作用及浮力作用下,盐构造发育相对缓慢,强烈的区域挤压作用是盐构造快速发育的重要原因,并促进差异负载、重力滑移作用和浮力作用进一步发展,形成较为复杂的盐构造体系。盐构造的研究对于探寻钾盐矿体的成因、运动规律和成矿作用具有重要意义。

英文摘要:

      :The Mengyejing sylvite deposit in Lanping-Simao Basin, Yunnan consists of very rich potash. The potash layers, unconformable (or disconformable) with the overlying clastic sediments, present well-developed salt structure and multi-phase folds. The complex salt structure system formed due to the strong compression during the Early Himalayan Movement, differences in load, and the gravity sliding function in process of basin lifting and lowering. Researches show that the Mengyejing sylvite deposit was affected by multiple factors, of which the gravity sliding function was the initial power source. The following differences in load and buoyancy caused a relatively low rate of salt structure development. Then the intense regional compression significantly accelerated this process, which also caused further development of the differences of load, gravity sliding function and buoyancy, and consequently formed the complex salt structure. Researches on salt structures are significant to study the causes of formation, law of motion, and mineralization of the potash ore body.