东秦岭-大别山钼成矿带赋矿地层分布规律

对东寒岭-大别山钼成矿带25个钼矿床赋矿地层及围岩进行统计观察，可清楚看出，所有钼矿床赋矿地层均为前寒武系老地层，无一例外。当成矿母岩侵入于寒武系及其以后地层中时均不形成工业矿床。然而，在前寒武系老地层中，不同的围岩岩性对钼矿床成矿作用产生的影响也不尽相同。主要反映在：1）前寒武系为地幔分异熔浆上侵时捕获有用组分钼的主要矿源层；2）作为成矿母岩的围岩，其岩性对矿床主要矿种组合有潜在的制约作用；3）围岩的物理力学性质，尤其是围岩的抗压抗剪强度，即岩石的破裂程度对成钼作用起着关键作用。围岩容矿裂隙的发育程度决定了矿石品位的高低，从而限制着矿床的规模。在东秦岭-大别山钼成矿带进一步寻找钼矿资源的主导思想方面，前寒武系尤其是元古界老地层可作为找矿区域首选，其次， 元古界岩石组合中的火山岩系列、大理岩及片岩系列构成成矿有利的围岩岩性，也是非常重要的地质因素。

THE DISTRIBUTION LAW OF BEARING ORE STRATUM IN EAST QINLING-DABIE MOUNTAIN MINERALIZATION BELT

Statisticing the stratum and mother rock of 25 molybdenum deposits bearing ore stratum in east Qinling-Dabie mountain mineralization belt,we can see clearly,all the molybdenum deposits stratum are old stratum of ex-Cambrian System,none exception.When ore-forming mother rock invade in Cambrian system and later stratums,all can't form industry mineral deposit.However,in the ex-cambrian system stratum,the different country rock,carry on different influence to ore-forming process.The main reflection is: 1)The ex-cambrian system is the main source bed when mentle differentiation magmatic melt invades up succeed in catching the useful element molybdenum;2)As country rock of the ore-forming mother rock,its lithology takes latent restrict action to main commodity combination of the ore bed.3)The physics mechanics property of the country rock,particularly its strength of antipresser and antishear,that is the broken degree of rock takes key action to molybdenum-forming.The development degree of contain ore cracks in the country rock decides grade of ore and thus limit the scope of mineral deposit.The predominant thought of looking for the molybdenum mineral resources in East Qinling-Dabie mountain molybdenum mineralization belt,the ex-cambria system,especially Yuangu erathem is the first to choose,and then volcanic rock series,marble and the schist series which constitute the beneficial country rock,is also the very important geology factor.