吉林省梨树县杏山膨润土矿地质特征及成因分析

Geological features and genesis analysis of Xingshan bentonite deposit in Lishu County,Jilin Province

在总结梨树县杏山膨润土矿地质特征的基础上,对矿床成因进行了分析。矿床赋存于下白垩统泉头组含砾粉砂岩、细砂岩、粉砂岩、粉砂质泥岩、中细粒砂岩、泥质粉砂岩中。燕山晚期泉头期火山喷发期间,大量火山碎屑物及陆源老火山岩、火山碎屑岩等成矿物质搬运到松辽湖盆地的杏山地区中沉积。在碱性水介质条件及相对稳定的水动力条件下,经分解蚀变形成了膨润土矿床,矿床的成因类型为湖泊相沉积型。

On the basis of summarizing the geological features of Xingshan bentonite deposit in Lishu County,the genesis of the deposit is analyzed.The deposit occurs in pebbly siltstone,fine sandstone,siltstone,silty mudstone,medium and fine-grained sandstone and argillaceous siltstone of Quantou Formation of Lower Cretaceous.During the late Yanshanian Quantou volcanic eruption,a large number of pyroclastic materials,terrigenous old volcanic rocks,pyroclastic rocks and other ore-forming materials were transported to Xingshan area of Songliao lake basin for deposition.Under the alkaline water medium conditions and relatively stable hydrodynamic conditions,the bentonite deposit was formed through decomposition and alteration.The genetic type of the deposit is lacustrine sedimentary type.