江西省冷水坑银铅锌矿田地质特征及成矿预测

江西省冷水坑银铅锌矿田是武夷山多金属成矿带上重要的矿集区之一。为进一步查明矿田地质特征,结合区域成矿背景,以冷水坑矿区地质勘查成果为依据,通过深入分析典型矿体地质特征、矿石组构、围岩蚀变特征,划分了成矿期次,并对同位素地球化学特征进行了总结,提出了层-体耦合的成矿模式。在此基础上,综合矿田及其外围最新物化探资料,划分出了3处找矿预测区,即鲍家矿区深部预测区、麻地—碧山(燕山)和碧溪—洋泗坂预测区。研究表明:鲍家矿区深部特别是在斑岩型矿体下部具有寻找层控型矿体的较大潜力;麻地—碧山(燕山)预测区为预测隐伏于变质岩及火山岩的深层矿化体的重要靶区;碧溪—洋泗坂预测区为寻找深部隐伏斑岩型银多金属矿床和层控型铅锌银矿床的有利地段。上述分析对于进一步在冷水坑铅锌矿田及其外区开展铅锌矿找矿预测工作有一定的参考价值。

Geological Characteristics and Prospecting Prediction of Lengshuikeng Ag-Pb-Zn Ore Field,Jiangxi Province

Lengshuikeng Pb-Zn-Ag Ore Field is the one the important ore concentration area in Wuyishan polymetallic metallogenic belt. In order to identify the geological characteristics of the ore field,combing with the regional metallogenic geo-logical background,and based on the some related geological and exploration results in Lengshuikeng Ore Field,through deep analysis of typical ore-bodies geological characteristics,ore structures,wall rock alteration characteristics,the mineralization pe-riods are divided and the isotopic geochemcial characteristics is summarized,besides that,the layer-body coupling metallogenic model is proposed. Based on the above discussion results,the newly geochemical exploration results of the ore field and its ad-jacent areas are analyzed comprehensively,and three metallogenic prediction areas are divided,they area Baojia deep prediction area,Madi-Bishan ( Yanshan) prediction area and Bixi-Yangsiban prediction area. The metallogenic potential study results of the three prediction areas show that:the depth of Baojia mining area especially for the depth of the porphyry-type ore-bodies are the important prospecting target area of stratum controlling type ore-bodies;Madi-Bishan ( Yanshan) prediction area is the im-portant prospecting target area of the deep mineralization bodies buried in metamorphic rocks and volcanic rocks;Bixi-Yangsi-ban prediction area is the important prospecting target area of deep concealed porphyry type Ag-polymetallic and deep con-cealed stratum controlling type Pb-Zn ore-bodies. The above study results related to the geological characteristics and prospec-ting prediction of Lengshikeng Ag-Pb-Zn Ore Field can provide some reliable reference for the further prospecting and explora-tion works of Ag-Pb-Zn deposits in the ore field or its adjacent areas.