Sedimentary and Geochemical Characteristics of Yanshankou Salt Dome in West of Kuqa Depression,Xinjiang
The salt domes exposed on the surface in west of Kuqa depression can be a key focus of potassium salt investigation and research,but there is relatively little systematic research combining sedimentology and geochemistry on the surface salt domes.This article selects a local area of Yanshankou salt dome,analyzes its geological characteristics and potassium exploration potential through outcrop section observation,hand specimen and thin section identification,halite fluid inclusion and geochemical characteristics research,and further explores the ideas and methods of using surface rock salt as the research object for potassium exploration.Through observation of stratigraphic section,identification of thin sections,and study of halite fluid inclusions,this article believes that the study area has preserved many original sedimentary states and information such as original bedding,original clay-gravel,and original inclusions.The uniform temperature of halite fluid inclusions is significantly lower than that of long-term buried underground rock salt inclusions,indicating that the rock salt layer continues moving upwards shortly after its formation under the dual effects of salt dome buoyancy and tectonic compression.By analyzing the comprehensive geochemical indicators of K/water insoluble matter,Br,Rb×103/K,B×103/K,and Mn2+/Fe3+in clay,it is clearly recognized that in the development stage of relatively pure rock salt layers,saline brine has relatively concentrated characteristics.
sedimentologyhalite fluid inclusiongeochemistryYanshankou salt domeKuqa depression
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