豫西杜关锰银矿田火山隐爆角砾岩特征及其形成机制

Features of Volcanic Crypto-Explosive Breccia and Its Formation Mecanism of Duguan Mn-Ag Ore-Field in Western Henan

豫西杜关锰银矿田火山隐爆角砾岩的形成主要与气液挥发分和超浅成的燕山期闪长岩及闪长玢岩有关,并受该地区近东西向深断裂的控制,而火山隐爆角砾筒又控制着杜关地区锰银矿床(点)的分布,豫西杜关锰银矿田由若干个矿床(点)构成,矿田内已发现多处隐爆角砾岩筒,这些火山机构均与成矿有密切的关系。本文介绍了两个主要火山隐爆角砾岩筒的地质特征,并论述了两类隐爆角砾岩的形成机制。原地棱角状火山角砾岩是由火山爆发震碎作用造成的,异地溶蚀状角砾岩是由流化作用造成的。

In Duguan Mn-Ag ore field, western Henan, consisting of several Mn-Ag deposits, several crypto-explosive breccia pipes have been found. There are close relations between crypto-explosive breccia bodies and deposits. The geological feature and ore-controlling processes of two crypto -explosive breccia pipes have been stated in this paper and the genetic mechanism of crypto-explosive breccia pipes has been summarized systematically.