论文部分内容阅读
华县桃园钼矿位于华北地块南缘秦岭造山带后陆逆冲断褶带-小秦岭逆冲推覆构造系。前人通过1:5万的地质题图和化探扫面工作对该矿床的异常特征和成矿规律有了较好的认识,但对关系矿床后期扩大和开采的地质特征和成因存在许多不同的认识。采用野外钻探、室内分析测试和岩矿鉴定等手段对该区的地质特征及成因进行分析。得出该矿床受北西向和北东向断裂带交汇形成的“构造框”控制,由含钼酸性岩脉组成,矿脉发育钾长石化、硅化、黑云母化等高温蚀变。含矿岩脉与辉绿岩、偏碱性正长斑岩、黑云(角闪)正长斑岩相伴,且穿切基-碱性岩脉,沿基底断裂带分布的基性-碱性岩浆活动有关,属高温热液斑岩型钼矿床。
The Taoyuan molybdenum deposit in Huaxian County is located in the Qinling orogenic belt of the northern part of North China Block and possesses the Houlu thrust belt - the Xiaoqinling thrust nappe structure system. The predecessors have a good understanding of the anomaly characteristics and metallogenic regularity of this deposit through 1: 50000 geological map and geochemical scanning work, but there are many differences in the geological characteristics and causes of late extension and mining of related deposits Understanding. The geological characteristics and causes of this area are analyzed by means of field drilling, indoor analysis and testing and identification of rock and mine. It is concluded that the deposit is controlled by the “structural frame” control formed by the intersection of the NW and NE faults and is composed of molybdic acid-bearing dykes. The veins develop high-temperature alteration of potassium feldspar, silicification and biotitization. Ore-bearing veins are associated with diabase, anorthosite-positive plagioclase, biotite (hornblende) orthorhombic, and cut-base-alkaline veins along the basement distribution of the basement-alkaline Magmatic activities related to a high temperature hydrothermal porphyry type molybdenum deposit.