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西藏谢通门展咱木部异常区铅锌找矿前景

     

摘要

The preliminary study of the lead-zinc exploration prospect in the Zhanzanmubu area, Xaitongmoin,Tibet is based on regional geology, surveys of stream sediments, and soil and high-precision magnetic measurements.The exposed stratum is mainly crystal tuff and andesite porphyrite of Tertiary Eocene Nianbo Formation.Exposed magmatic rocks are mainly Tertiary Eocene monzonitic granite and small area of granite-porphyry.Diagrams showing the elemental anomalies based on the stream sediment survey in the Zhanzanmubu area have disclosed that there are remarkable element anomalies of various scales, such as Pb, Zn, Ag, Au, Sb, Cu, Ba,Hg, Sn and As, especially those of Pb and Zn are relatively large.The soil profile in the Zhanzanmubu area shows that anomalies of Pb, Zn and Ag are more significant.The magnetic survey indicates that the anomalies of geochemical survey are nearby the magnetic anomalies.By qualitative analysis of magnetic anomalies, it is inferred that there are favorable for deep exploration prediction of these metal deposits.Magnetic anomalies indicate that it is favorable location for hydrothermal mineralization.By the combination relationship between elements from soil survey data, it is inferred that Pb, Zn and Ag, As, Sb, Cu are of the close.Combined with geochemical anomalies and geological characteristics, the lead-zinc deposits in the Zhanzanmubu area may be of volcanic rock type associated with lead-zinc polymetallic ore deposits.It follows that the study area is expected to be a prospective area for the lead-zinc (silver) polymetallic ore deposits related with volcanic rocks in the Zhanzanmubu area.%从区域地质、水系沉积物测量、土壤测量和高精度磁测等方面对西藏展咱木部地区的铅锌找矿前景做初步分析.出露地层主要为第三系始新统年波组的晶屑凝厌岩及安山玢岩,区内出露岩体主要为始新世花岗岩及小面积的花岗斑岩.利用1:5万水系沉积物测量编制异常图,发现区内Pb、Zn、Ag、Au、Sb、Cu、Ba、Hg、Sn、As等元素有不同规模的明显异常,且Pb、Zn异常规模较大.通过土壤剖面可以看出Pb、Zn异常更显著.高精度磁测结果显示,化探异常位于磁异常附近.磁异常的定性分析对这些金属矿的深部找矿预测可以提供有利证据.磁异常显示该区是热液成矿的有利部位.通过研究元素间组合关系发现,Pb、Zn与Ag、As、Sb、Cu的关系密切,结合化探异常和地质特征,推断区内可能存在与火山岩有关的铅锌多金属矿床类型.研究表明研究区内寻找与火山岩有关的铅锌(银)多金属矿有较好的找矿前景.

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