三江北段成矿带区域化探工作进展及主要成果

摘要

The 1∶200 000 regional geochemical work with the area of 160 848 km2 is completed by the new general survey of land and resources work in northern section of the Sanjiang metallogenic belt in the southwest of our country,the southern region of Qinghai province is covered completely by the geo-chemical work,a large number of regional geochemical anomalies and metallogenic prospect areas are a-vailable for further work are obtained to provide detailed geochemical data for the mineral resources evalu-ation of the important metallogenic belts of the northern section of the Sanjiang metallogenic belt.By a-nomaly verification,the important Pb,Zn polymetallic deposits such as Dongmozhazhua,Duocaima,Mo-hailahen,Chuduoqu and a large number of prospecting information are obtained,the above Pb,Zn poly-metallic deposits with large and very large scale by verification.The Tuotuohe Pb-Zn geochemical blocks and Yushu Pb-Zn geochemical blocks are both with very large scale,they are delineated in the northern section of the Sanjiang metallogenic belt,besides that,they have the important prospecting significance. The scale of Pb,Zn polymetallic deposits such as Basihu,Nariniya,Quemocuo,Zhamuqu,Guocanglema, Zhalaxiageyong are found and magnified by conducting the subsequent exploration work in the area.The above polymetallic deposits area are becoming the important mineral exploration area in the northern sec-tion of the Sanjiang metallogenic belt.The analysis results of the regional chemical work and major a-chievements of the northern section of the Sanjiang metallogenic belt show that the regional chemical work play an important role for the prospecting work in the important metallogenic belts,the mineral resources survey and evaluation work in the northern section of the Sanjiang metallogenic belt are promoted.%新一轮国土资源大调查在西南三江北段成矿带完成了面积为160848 km2的1∶20万区域化探工作，实现了青海南部区域化探工作的全面覆盖，提供了大批可供进一步开展工作的区域地球化学异常和成矿远景区，为三江北段重要成矿带矿产资源评价工作提供了翔实的地球化学资料。经异常查证，区内已发现了东莫扎抓、多才玛、莫海拉亨、楚多曲等重要的铅锌多金属矿床及一批找矿信息，已证实具有大型—超大型规模。区内所圈定的规模巨大的沱沱河铅锌地球化学块体和玉树铅锌地球化学块体具有重要的找矿意义，在后续勘查工作中继续发现并扩大了巴斯湖、那日尼亚、雀莫错、扎木曲、郭仓乐玛、扎拉夏格涌等铅锌矿床规模，使之成为青海三江北段重要的矿产勘查区域。近年来三江北段成矿带的化探工作进展及找矿成果表明，区域化探工作在重要成矿带上对于矿床的发现具有重要作用，有力推动了三江北段成矿带矿产资源调查评价工作的开展。