东秦岭大别山段中酸性小岩体成矿规律研究

Research on Minerogenesis Law of Neutral-Acid Small Rock Mass in Dabieshan Sector of Eastern Qinling Mountains

东秦岭大别山段矿化中酸性小岩体集中分布在秦岭钼(钨)成矿带东段,是我国重要的钼(钨)矿带之一。矿化中酸性小岩体多是受北北西向和北北东向断裂构造控制的复式杂岩体。不同形成环境从浅成-超浅成-深成相,Mo元素丰度由高-低,分为浅成-超浅成斑岩钼(铜)矿化、中-深成斑岩-矽卡岩型钼(钨、铜)矿化和浅成斑岩型钼矿化三种类型。指出了小岩体主导的钼(铜)矿床具有明显的金属(元素)或矿物组份分带,表现为各带间金属元素含量递变及不同矿物组合按序析出,成矿物质主要来源于下地壳。

Mineralized neutral-acid small rock mass in Dabieshan Sector of Eastern Qinling Mountains is distributed in the eastern sector of molybdenum （tungsten ） metallogenic belt of Qinling Mountains. The metallogenic belt is one of important molybdenum （tungsten ） ore belts in our country. The mineralized neutral-acid small rock mass is complex rock mass controlled by faulted structure of north-north west and north-north east. Formation environment is different： from supergene phase-ultra-supergene phase-hypogene phase. Abundance of Mo element is from high to low and there are three types. mineralized supergene-ultra-supergene porphyry molybdenum （ copper）, hypogene medium-hypogene porphyry-skarn molybdenum （tungsten, copper ） and mineralized supergene porphyry molybdenum. The small rock mass mainly containing molybdenum （copper） deposit has obvious metal （ element） or mineral constituent zonings. It shows that contents of metal elements in zonings change gradually and different mineral constituents separate out orderly. Minerogenesis materials mainlv come from lower earth crust.