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本文简要评述了可与中国地洼成矿对比的北美活化成矿,分三类成矿区(mineralized terrains)进行论述: (1)位于前寒武纪结晶基底之上,以产于主要由碳酸盐组成的地台内的“冷”(附近没有侵入岩体)铅锌、萤石和重晶石矿化为主的成矿区。这里常见几种矿石类型共生,合称“密西西比河谷型”。 (2)被块状断层切割的怀俄明前陆带多孔砂岩中的“冷”铀渗滤成矿区。 (3)大陆内部山脉和造山带内的“热”活化成矿区。这里有高定位的钙碱性到碱性小侵入体和不连续的火山岩覆盖区。 本文着重描述科罗拉多落基山脉的情况,对北美其它地区仅作简要列举。
This paper briefly reviews the North American activation mineralization that can be compared with the diagenesis in China and is divided into three types of mineralized terrains: (1) Located on the Precambrian crystalline basement, Salt formed within the platform of the “cold” (no intrusion of rock near the) lead and zinc, fluorite and barite mineralized mainly metallogenic zone. Several common ore types here symbiosis, collectively known as the “Mississippi Valley type.” (2) “cold” uranium percolation metallogenic zone in the Wyoming foreland porous sandstone cut by massive faults. (3) “hot” activation mineralization within the mainland’s interior mountains and orogenic belts. There are highly localized calc-alkaline to alkaline small intrusions and discontinuous volcanic cover. This article focuses on the situation in the Colorado’s Rocky Mountains and makes a brief summary of the rest of North America.