辽西紫都台-于寺盆地膨润土矿岩石矿物学特征研究  

A study of the rock and mineralogy characteristics of bentonite deposits in Zidutai-Yusi Basin in western Liaoning

作　　者：刘殿鹤 张雪花 王春连[1] 张华[1] LIU Dian-he;ZHANG Xue-hua;WANG Chun-lian;ZHANG Hua(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;School of Earth and Space Sciences,Peking University,Beijing 100871,China;Liaoning Nonferrous Metals Investigation and Research Institute Co.,Ltd.,Shenyang 110013,China)

机构地区：[1]中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京100037 [2]北京大学地球与空间科学学院,北京100871 [3]辽宁有色勘察研究院有限责任公司,辽宁沈阳110013

出　　处：《岩石矿物学杂志》2021年第1期65-75,共11页Acta Petrologica et Mineralogica

基　　金：中央级公益性科研院所基本科研业务费专项(KK2005);中国地质调查局地质矿产调查评价专项(DD20190606);辽宁省地质勘查基金(辽国土资项发[2009]4号、[2010]26号、[2011]88号)。

摘　　要：对紫都台-于寺盆地内二道河、哈尔套、北窝棚及下扎兰波罗等膨润土矿床进行了系统采样、处理,开展与矿床相关的赋矿岩系岩石学及矿物学特征研究。通过基本分析、XRD、化学全分析、阳离子交换量等手段对样品进行测试,研究结果表明沉凝灰岩、流纹质熔结凝灰岩、砂砾质凝灰岩等富含火山玻璃的岩石更易于水解形成膨润土矿。膨润土总体呈碱性,矿物组成以蒙脱石为主,其次为石英、斜长石等伴生矿物。XRD及阳离子交换量表明盆地北部二道河及哈尔套膨润土矿发育钙基及钠基膨润土,并呈现上部钙基膨润土、下部钠基膨润土的分层特征,对盆地南部下扎兰波罗及北窝棚膨润土矿的深部寻找钠基膨润土矿具有指导意义。Systematic sampling and processing of such bentonite deposits as Erdaohe,Hartao,Beiwopeng and Xiazhalanboluo deposits in Zidutai-Yusi Basin were carried out,and petrological and mineralogical characteristics of ore-bearing rock series related to the deposit were investigated.The samples were analyzed and tested by means of basic analysis,XRD,chemical analysis and cation exchange capacity.The results show that rocks rich in volcanic glass,such as sedimentary tuff,rhyolitic ignimbrite and sandy tuff,are easier to hydrolyze to form bentonite ore.Bentonite is generally alkaline,and its mineral composition is mainly montmorillonite,followed by associated minerals such as quartz and plagioclase.XRD and cation exchange capacity show that calcium-based bentonite and sodium-based bentonite are developed in Erdaohe and Hartao bentonite deposits on the north side,showing layered characteristics of upper calcium-based bentonite and lower sodium-based bentonite.The results obtained by the authors are of guiding significance in search for sodium bentonite deposits in the deep part of Xiazhalanboluo and Beiwopeng bentonite deposits in the south of the basin.

关 键 词：膨润土 岩石矿物学特征 紫都台-于寺盆地 辽宁西部 

分 类 号：P578.967[天文地球—矿物学]