摘要
本文系统地介绍了武当山群的层序、分布、时代、岩石组合及常、微量元素地球化学特征,阐述了地层金银含矿性评价的地球化学准则,进行了武当山群金银含矿性的评价。研究表明武当山群挡鱼河组上亚组及杨坪组为有利金银矿化产出的地层,它们控制着区内的金银矿化。
The distribution, sequence, geological age, petrological combination and geochemical characteristics of major and trace elements of Wudangshan Group are discussed. And its gold (silver)ore bearing ability is systematically appraised, and the geochemical apprasial methods also has been explained in this paper. Wudangshan Group is chiefly composed of meta—basic volcanic rock,meta—feisic volcanic rock and meta—sedimentary rock. The meta—basic volcanic rock is comparatively rich in Fe_2O_3, Na_2O, Th, Y ,and poor in K_2O, FeO, TiO_2, Cr, Co, Ni, V, P; whereas, the meta—felsic volcanic rock is comparatively rich in Fe_2O_3, Th, Y, Ti, V, Mn, As, Sb, Bi, and poor in CaO,P_2O_5,Sr,Ba,La,Zr,Cu,Pb,Zn,Be,Nb,Rb. The meta—sedimentary rock of Yangping Formation of Wudangshan Group is comparatively rich in Ba,Th,Y,Ti,V,Mn,Cu,As,Sb,and poor in Sr,La,Pb,Zn,Be,Nb,Rb,Sn, Zr,and has similar characteristics to graywack in active coutinental margin. Factor combination of chemical elements of various formations of Wudangshan Group are corresponding to magrnatic evolution trend ,isomorphism and alteration. Because of higher abundance of gold and silver ,lower Xg/Xa, poly—peak skew distribution and logrithm normal or logarithm normal skew distribbution of silver, higher ratio of accessible gold and silver, forming special element combination(including gold and ssilver)being similar to mineralizing elements combination in the area. Yangping Formation and Upper Dangyehe Formation of Wudangshan Group can be regarded as favourable strata to gold and silver mineralizationin the area. In addition,the metallogenetic model of gold and silver of Wudangshan Group in the area also has been given in this paper.
出处
《地质找矿论丛》
CAS
CSCD
1991年第1期14-27,共14页
Contributions to Geology and Mineral Resources Research
