蠎西寺沟斑岩-矽卡岩型钨钼矿物化探异常特征及找矿模型

Geophysical and Geochemical Anomaly Characteristics and Ore Prospecting Model for the Sigou Porphyry-Skarn Type Tungsten-Molybdenum Deposit in Mangxi Area

北秦岭地区是我国重要的钼金多金属成矿区,区内寺沟钨钼矿为斑岩-矽卡岩型矿床,是蟒岭岩体西缘地区发现的首个隐伏钨钼矿床,其矿床规模达到中型,目前仍在勘查中。利用地质、地球化学、地球物理多学科综合信息找矿方法,很大程度上避免了单一地质勘查方法的多解性和局限性,提高了异常解译精度和可靠性。本文在合理运用多种勘查技术方法,充分总结矿区找矿标志的基础上,建立了一套综合找矿模式:(1)借助15万水系沉积物测量初选找矿靶区;(2)大比例尺土壤地球化学测量缩小找矿靶区;(3)利用岩石地球化学剖面,配合槽探工程查明地表及浅部矿(化)体特征;(4)通过物探测深剖面布设,探索深部成矿有利空间;(5)深部钻探验证并预测找矿远景,同时利用钻探地质信息反向约束物探解译,提高解译精度并指导后续勘查工作。以寺沟钨钼矿为典型矿床,在总结地质、化探、物探等找矿标志的基础上,建立了本区斑岩-矽卡岩型钨钼矿床的地质-地球化学-地球物理综合找矿模型。该模型在矿区深部验证及外围靶区预测中取得了良好的应用效果,目前外围靶区正在进行工程验证,找矿前景良好。

The Sigou tungsten-molybdenum deposit is a porphyry skarn type deposit in the north Qinling area.It is the first concealed tungsten-molybdenum deposit discovered in the western margin of the Mangling rock mass.The deposit is medium-sized and still under exploration.The multi-disciplinary comprehensive information prospecting method of geology,geochemistry and geophysics avoids the multi-solution and limitation of single geological exploration method to a large extent,and improves the accuracy and reliability of anomaly interpretation.In this work,a set of comprehensive prospecting model was established on the basis of rational use of various exploration techniques and methods and full summary of prospecting indicators in the mining area:(1)Primary prospecting target area was determined by 150000 stream sediment survey;(2)large-scale soil geochemical survey was adopted to reduce the prospecting target area;(3)The characteristics of surface and shallow ore bodies were determined by using geochemical profiles and trough exploration;(4)Through the layout of geophysical sounding profile,the favorable space for deep mineralization is explored;(5)Deep drilling verifies and predicts prospecting prospects,and at the same time using drilling geological information reverse constraints geophysical interpretation,improve interpretation accuracy and guide subsequent exploration work.Taken the Sigou tungsten-molybdenum deposit as a typical deposit,a comprehensive prospecting model of porphyry skarn type tungsten-molybdenum deposit was established based on geological,geochemical and geophysical exploration criteria.This model has achieved good application effect in deep verification and prediction of peripheral target area.At present,the peripheral target area is undergoing engineering verification and has a good prospecting prospect.