陕西双王钠长石岩特征及金矿床形成期次分析  

CHARACTERISTICS OF GOLD-HOSTED STRATABOUND ALBITITE AND FORMING STAGES OF SHUANGWANG GOLD DEPOSIT IN SHAANXI PROVINCE

作　　者：梁华英[1] 王秀璋[1] 程景平[1] 

机构地区：[1]中国科学院广州地球化学研究所,广州510640

出　　处：《大地构造与成矿学》2000年第4期350-356,共7页Geotectonica et Metallogenia

基　　金：国家自然科学基金!"热水沉积钠长石岩型金矿床的形成机制"(项目编号 49772 114);科学院重点项目!(KZ95 2 - 5 1- 435 )资助

摘　　要：双王含金钠长石岩带主要为层状 ,产于泥盆系星红铺组粉砂质板岩中。钠长石岩带主要由层状钠长石岩及钠长石岩角砾岩组成。角砾岩角砾主要为层状钠长石岩碎裂形成。层状钠长石岩及钠长石岩角砾韵律纹层构造及条带状构造发育 ,矿物组合和热水沉积钠长石岩相同。钠长石岩主元素及微量元素特征表明钠长石岩具热水沉积的一般特征。角砾岩角砾棱角明显 ,具可拼接破裂构造或典型角砾状构造 ;钠长石岩角砾和早期胶结物矿物组成基本相同。胶结充填物中晶洞构造发育 ,显示同生液压致裂角砾的一般特征。据钠长石岩沉积特征构造及角砾特征 ,认为钠长石岩及金矿床主要是热水沉积 -隐爆作用形成的 ,可分为 4个形成阶段 ,金矿矿化主要和第 3、4阶段有关。The Shuangwang gold bearing albitite zone, which is composed of stratabound albitite, albitite breccia occurred conformably in the Xinghongpu Group, Devonian silt slate. Stratabound albitite and albitite rubble displaying a rhythmic layering of different color albitite and banded structure, have the same paragenetic association of minerals as typical hot water sedimentary albitite and locates on the hot water sediment region on the Fe-Mn-(Cu+Co+Ni)×10 diagram. The albitite breccia is characterized by matching rupture structure or typical brecciated structure with sharp edge albitite rubble; the albitite rubble shares the same mineral association as those of the second stage concret with miarolitic texture. The characteristics of albitite rubble and concret suggest that the albitite breccia is contemporaneous or penecontemporaneous breccia. It is concluded that the Shuangwang gold bearing albitite breccia owes its origin to hot water sediment and hot water explosion under the surface of hot water sediment. Four stages of hot water sediment and mineralization could be distinguished for the Shuangwang gold deposit and gold mineralization developed only in the third and fourth stages.

关 键 词：钠长石岩 热水沉积 金矿床 隐爆作用 沉积特征 

分 类 号：P618.510.1[天文地球—矿床学] P588.12[天文地球—地质学]