论东秦岭秋树湾铜钼矿区扩大找矿的有利因素

On the Favorable Factors of Expanding Exploration in the Qiushuwan Copper-Molybdenum Ore Deposit of the East Qinling Orogenic Belt

作为东秦岭铜钼矿带上重要的铜钼矿区,秋树湾及其外围的找矿工作一直未取得重大突破,因此,明确秋树湾岩体形态及位置是扩大找矿的关键所在。本文通过分析成矿母岩、蚀变及矿化分带,结合遥感、地球物理探测技术,总结出研究区矿化蚀变分带模型,并利用钻孔验证,在秋树湾矿区先期取得了找矿突破。在理论和实践上指出:秋树湾斑岩体为本区的成矿母岩;埋深在1000m以下仍存在花岗斑岩体,深部斑岩体是重要的找矿方向;近南北向断裂为岩浆沿断裂从东向北西倾入提供了通道,岩体具有西浅东深的特点。

As an important copper -molybdenum deposit in the East Qinling copper -molybdenum belt, no major breakthrough has been made yet for ore prospecting in the Qiushuwan mine and its surrounding area. It is thus critical to determine the shape and position of the Qiushuwan rock body for ex- panding exploration. Through analysis of the ore -forming source rocks, alteration and mineralization zoning, in combination with remote sensing and geophysi- cal techniques ,this work suggested a mineralization alteration model for the study area. Then drill holes were deployed to validate the model ,and preliminary success in prospecting has been made in the Qiushuwan deposit. This paper shows that the Qiushuwan porphyry is the ore - forming source rock in this re-gion ,there arc still granitic poFphyries below the depth of 1000 m. Thus the deep - seated porphyries should be the future prospecting targets. The nearly NE - trending faults serve as conduits for magma migration from the east to the northwest ,and the burial rock bodies are shallow in the west and deep in the east.