河南省罗山县陡坡花岗斑岩型钼矿床地质特征及成因探讨

陡坡钼矿床是一新发现的中型钼矿床,该矿床赋存于早白垩世灵山超单元岩体与围岩的接触带内侧,矿化类型主要为细脉浸染状。矿床中金属矿物主要为黄铜矿、辉钼矿、方铅矿、闪锌矿、黄铁矿、磁铁矿、赤铁矿,次为磁黄铁矿、斑铜矿等。灵山超单元花岗岩岩石类型属高硅富碱钙碱性(偏碱性)系列,SiO2含量72～77%,K2O+Na2O总量大于7.9%,K2O/Na2O大于1。矿床的围岩蚀变叠加组合主要为硅化——钾长石化——黄铁矿化组合、硅化——绿泥石化——黄铁矿化组合。该矿床属中高温热液斑岩型钼矿床,结合岩浆岩特征,成矿作用于与岩体关系密切,并可能受幔源岩浆混合作用的影响。

Geological Characteristics and Genesis of the Doupo Porphyry Mo Deposit,Luoshan,Henan Province

The Doupo mine is a middle-scal porphyry Mo deposit newly discovered. The deposit is generating unit of rock and wall rock in Early Cretaceous Lingshan contact with the medial. The mineralization type is mainly veinlet. Metal mineral deposits are mainly chalcopyrite, molybdenite, galena, sphalerite, pyrite, magnetite, hematite, pyrite, bornite time etc. Lingshan superunit granite rock type is high Guifu alkali calcium alkaline （alkaline） series. The SiO2 content of 72 - 77%, K20＋NazO is bigger than 7.9%, K20/Na20 more than 1. Wall rock alteration deposit variable combination mainly silicification -K-feldsparization, pyritization combination, Silicification, chloritization and pyritization combination.The deposit belongs to hydrothermal porphyry molybdenum deposit. Combined with the characteristics of magmatic rocks, Mineralization in close relationship with rock, Effect and may be affected by the mantle-derived magma mixing.