东秦岭东段新发现的沙坡岭细脉浸染型钼矿地质特征、Re-Os同位素年龄及其地质意义

豫西洛宁沙坡岭钼矿床位于华北克拉通南缘东秦岭钼矿带东段，是新近发现的赋存于太古宙太华群变质岩中的细脉浸染型钼矿床。本文对其地质特征进行了研究，并初步测定了1个辉钼矿样品的Re－Os同位素年龄，获得模式年龄为126.8±1.7Ma，表明沙坡岭钼矿形成于燕山期，接近金堆城、雷门沟钼矿的形成时代，Re同位素含量显示其地幔来源的特征。沙坡岭钼矿形成机制错综复杂，有待进一步研究，特别是深部钻孔工程验证工作，对于验证深部是否隐伏着与成矿相关的斑岩体、储量更大的斑岩型钼矿有着重要作用，找矿潜力巨大。

Geological Features, Re-Os Isotopic Dating and Its Geological Significance of Newly Discovered Shapoling Veinlet-Disseminated Mo Deposit in Eastern Part of the Eastern Qinling Mountains

The Shapolin Mo deposit in Luoning in western Henan Province, which is located in eastern part of the Eastern Qinling molybdenum ore belt in southern margin of the North China craton, is a veinlet-disseminated type molybdenite deposit newly discovered in the hypometamorphic rocks of Archean Taihua Group. With the research of geological features and the Re-Os isotopic dating of one sample, the results obtained show that the model age of molybdenite in the quartz veins is 126.8±1.7Ma. It shows that the Shapoling molybdenum deposit was formed mainly in the stage of Yanshan, similar to Jinduicheng and Leimengou Mo deposit. According to the content of Re isotope, the ore forming materials mainly derived from upper mantle. Considering the complication of formation mechanism of the Shapoling molybdenum deposit, further research is needed. Deep drilling is also necessary so that we can verify the existence of deep-concealed porphyry bodies and porphyry type of Mo orefield of larger reserves and the potential of prospecting and exploration is great.