四川岔河地区水系沉积物地球化学特征及找矿方向  

Geochemical characteristics of stream sediments and prospecting direction in Chahe area of Sichuan Province

作　　者：徐云峰[1,2] 郝雪峰 秦宇龙[1,2] 王显锋 熊昌利[1,2] 李名则 武文辉[1,2] 詹涵钰 XU Yun-Feng;HAO Xue-Feng;QIN Yu-Long;WANG Xian-Feng;XIONG Chang-Li;LI Ming-Ze;WU Weng-Hui;ZHAN Han-Yu(Sichuan Geological Survey Institute,Chengdu 610081,China;Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resource Key Laboratory of Sichuan Province,Chengdu 610081,China)

机构地区：[1]四川省地质调查院,四川成都610081 [2]稀有稀土战略资源评价与利用四川省重点实验室,四川成都610081

出　　处：《物探与化探》2021年第3期624-638,共15页Geophysical and Geochemical Exploration

基　　金：中国地质调查局项目“四川会理县岔河—天宝山地区铅锌锡多金属矿矿产地质调查”(DD20190159-12);四川省地质调查院博士后研究站(科创平台)联合资助。

摘　　要：岔河锡矿是四川省最大的锡矿床。为寻求岔河地区锡矿找矿突破,对其开展了1∶5万水系沉积物测量。通过测试数据特征分析及因子分析等,研究元素组合特征,结果表明:Ag-Pb-Zn、Bi-F-W-Sn、Cu-Ni 3组主成矿元素分别具有相似的富集规律,其中Sn、W等中高温元素富集规律极为明显,元素异常空间分布叠合性较好。通过累积频率法、迭代法综合分析确定异常下限值,在此基础上编制元素异常图,并圈定9个综合异常。通过开展异常综合评价,优选出岔河和方家综合异常区为成矿远景区。通过成矿地质条件分析及矿产综合检查,在岔河成矿远景区新发现矽卡岩型钨锡矿脉一条,在方家成矿远景区新发现石英脉型钨矿脉十数条,其地质特征与钨矿床"五层楼+地下室"找矿模型具一定的相似性,具有较好的钨、铜、铅、钼等多金属矿找矿前景。The Chahe deposit is the largest tin deposit in Sichuan Province. In order to gain a prospecting breakthrough, the authors conducted 1∶50 000 stream sediment survey, studied the characteristics of element combination of this area by feature analysis and factor analysis of the measuring results. The results show that the three main ore-forming element groups of Ag-Pb-Zn, Bi-F-W-Sn and Cu-Ni have similar enrichment rules, in which the enrichment regularities of W, Sn and other medium and high temperature elements are extremely significant, and the overlapping features of the spatial distribution of the element anomalies are good.The lower limit values were determined by methods of cumulative frequency and iteration. The authors compiled the element anomaly maps and delineated nine comprehensive anomalies. By comprehensive evaluation of the anomalies, the authors consider that the Chahe and Fangjia composite anomalies are the prospective areas. The authors analyzed the geological condition for mineralization, carried out mineral inspection, and discovered a new skarn type tungsten-tin vein in the Chahe prospective area and more than ten new quartz-vein type tungsten veins in the Fangjia prospective area. The Fangjia prospective area, with a certain degree of similarity in geological characteristics with the "five-story+basement" prospecting model for tungsten deposits, has a favorite prospect in the search for polymetallic deposits such as tungsten, copper, lead and molybdenum.

关 键 词：岔河 水系沉积物测量 钨锡矿 地球化学特征 

分 类 号：P632[天文地球—地质矿产勘探]