东秦岭斑岩型钼(钨)矿床磁异常特征

CHARACTERISTICS OF MAGNETIC ANOMALIES OF PORPHYRY MOLYBDENUM( TUNGSTEN) DEPOSIT IN EAST QINLING MOUNTAIN

东秦岭斑岩型钼(钨)成矿带是中国重要的大型钼矿分布区之一,包括金堆城、南泥湖等6个超大型钼(钨)矿床和雷门沟等10余个中大型钼(钨)矿床。通过研究发现,这些钼矿床一般分布于重磁推断的隐伏岩体区及其附近,并与燕山期中酸性小斑岩体密切相关,矿体直接产于斑岩体上部、斑岩体与围岩的内外接触带及其附近。通过研究区域大岩基、典型矿集区隐伏岩体和成矿小斑岩体的磁场特征,建立了寻找小斑岩体的磁异常模型,分析了东秦岭地区寻找隐伏斑岩体的潜力,找矿潜力巨大。

The porphyry molybdenum(tungsten)metallogenic belt in eastern Qinling mountains is one of the most important large-scale molybdenum deposits in China,including six super-large molybdenum(tungsten)deposits such as Jinduicheng and Nannihu,and more than ten medium-large molybdenum(tungsten)deposits such as Leimengou.It is found that these molybdenum deposits are generally distributed in and near the concealed rock mass area inferred by gravity and magnetism,and are closely related to Yanshanian intermediate-acid porphyry.The ore bodies occur directly in the upper part of porphyry,the inner and outer contact zone between porphyry and surrounding rock and its vicinity.By studying the magnetic field characteristics of the regional large bedrock,the concealed rock mass and metallogenic porphyry bodies in the typical ore concentration areas,the magnetic anomaly model for searching for the small porphyry body is established,and the potential of searching for the concealed porphyry body in east Qinling mountains is analyzed.The prospecting potential is enormous.