滇西保山核桃坪铅锌矿床辉绿岩地质特征、岩相学及意义

Geological and Petrography Characteristics of the Diabase in Hetaoping Pb-Zn Deposit,Baoshan County,Western Yunnan Province and its Implications

产于滇西保山古生代地块内的核桃坪铅锌矿床,是近年来在西南"三江"地区勘查发现的为数不多的以断控脉状矽卡岩赋矿为特征的大型铅锌(铜银)多金属矿床之一。至今未揭露相关岩浆岩体,仅见大量的辉绿岩。本文在对区内辉绿岩野外地质特征进行了详细调查的基础上、研究了辉绿岩岩相学特征,并结合前人的研究成果,表明辉绿岩侵位早于成矿,与矿石矿物不具物源的相关性。辉绿岩作为化学障,导致其附近矿化作用增强。作为物理屏障,导致流体运移受阻。辉绿岩矿化强弱可作为找矿标志。

The Hetaoping Pb-Zn deposit of BaoShan county is located in western Yunnan province.It is one of large-scale lead-,zinc-,copper-,silver-polymetallic deposits characterized of vein skarn-type deposits ore-bearing controlled by fracture in three river area of Yunnan province,southwestern China.discussing diabase petrography on the basis of field geological characteristics of diabase and combined with the results of previous studies is systematically studied.The results show that the diabase emplacement earlier than mineralization.There is no ore correlation between the diabase and ore minerals provenance.The diabase enhanced mineralization surround it as a chemical barrier and disrupted fluid migration as a physical barrier.The mineralization diabase strength can be used as prospecting indicators.