川西观音桥地区土壤地球化学特征及锂矿找矿方向  

Soil geochemical characteristics and lithium ore prospecting direction in the Guanyinqiao area of western Sichuan

作　　者：李明 代鸿章 丁晓平 朱海洋 王学 杨天雨 LI Ming;DAI Hongzhang;DING Xiaoping;ZHU Haiyang;WANG Xue;YANG Tianyu(The 9th Geological Brigade of Sichuan,Deyang 618000,Sichuan,China;MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]四川省第九地质大队,四川德阳618000 [2]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

出　　处：《矿产勘查》2024年第8期1456-1465,共10页Mineral Exploration

基　　金：国家重点研发计划“战略性矿产资源开发利用”专项“我国西部伟晶岩型锂等稀有金属成矿规律与勘查技术”项目(2021YFC2901900);中国地质调查局项目“战略新兴产业矿产地质调查”(DD20230034);“锂铍铌钽等战略新兴矿产调查与潜力评价”(DD20230055);“松潘—甘孜成锂带锂铍多金属大型资源基地综合调查评价”(DD20190173)联合资助。

摘　　要：观音桥位于四川省阿坝州金川县内,地处可尔因重点勘查区西北,区内锂矿主要以锂辉石化赋存于花岗伟晶岩脉中,围岩蚀变主要为红柱石化、堇青石化和黑云母化等,目前该地区的化探异常以及找矿方向研究程度较低。为研究观音桥地区土壤地球化学特征,以此进一步指导找矿,本文对观音桥地区开展1∶10000土壤地球化学测量,选取了Li、Be、Nb、Ta、Th等11种元素进行测试,发现区内对Li矿具有指示作用的元素有Be、Nb、Ta等,与Th呈负相关。此次共圈定3处土壤地球化学组合异常,异常显示浓度分带好、浓集中心和异常峰值明显、各主成矿元素异常套合好,地质成矿条件优越。结合锂矿地质特征及HT2异常查证情况,新发现1处中型规模潜力锂矿床,取得找矿新进展。通过综合对比,推测在HT1组合异常带内也有望找到中型及以上规模锂矿床,为下一步区内锂矿找矿勘查工作指明了方向。Guanyinqiao is located in Jinchuan County,Aba Prefecture,Sichuan Province,and is located in the northwest of the Kelin key exploration area.The lithium deposits in the area are mainly spodumene-based granite pegmatite veins,and the wall rock alteration is mainly andalusite,cordierization and biotitization,etc.At present,the degree of research on geochemical anomalies and ore prospecting directions in this area is relatively low.In order to study the soil geochemical characteristics of the Guanyinqiao area and further guide mineral prospecting,a 1∶10000 soil geochemical measurement was carried out in the Guanyinqiao area,and 11 elements including Li,Be,Nb,Ta,and Th were selected for testing.It was found that the area elements that are indicative of Li ore include Be,Nb,Ta,etc.,which are negatively correlated with Th.A total of 3 soil geochemical combina⁃tion anomalies were delineated this time.The anomalies showed good concentration zoning,obvious concentration centers and abnormal peaks,good anomaly matching of major mineralization elements,and superior geological mineralization conditions.Combining the geological characteristics of lithium ore and verification of HT2 anomalies,a new medium-sized potential lithium deposit was discovered,making new progress in ore prospecting.Through comprehensive comparison,it is speculated that medium-sized and above-scale lithium deposits are also expected to be found in the HT1 combination abnormal zone,which points out the direction for the next step of lithium ore prospecting and exploration in the area.

关 键 词：锂矿 土壤地球化学测量 地球化学特征 找矿方向 观音桥地区 

分 类 号：P632[天文地球—地质矿产勘探]