甘肃寨上金矿床的控矿因素  

Discussion on the Ore-controlling Factors of Zhaishang Gold Deposit in Gansu Province

作　　者：喻万强[1,2] 刘纲[1] 王晓军[1] 陈祥[1] 王治华[1,2] 

机构地区：[1]武警黄金地质研究所,河北廊坊065000 [2]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《黄金科学技术》2010年第3期46-50,共5页Gold Science and Technology

摘　　要：寨上金矿区主要出露中泥盆统和下二叠统,中泥盆统分为4个岩性段,下二叠统分为2个岩性段,北矿带分布于背斜北翼下二叠统第一岩性段中,南矿带分布于核部中泥盆统第一岩性段中。地层岩性差异控制矿脉的形成和分布,矿脉产于软硬岩性接触界面且靠近软性一侧地层中,其产状与围岩具有明显的继承性。矿区构造由背斜、主干断裂和容矿断裂3部分组成。扎麻树背斜具有北薄南厚、北缓南陡、北翼正常南翼倒转的特点,走向NW,向西转折为近EW向,呈反"S"形。主干断裂和容矿断裂受控于背斜,伴随背斜的二次变形而成。矿脉夹持于主干断裂之间,分布于背斜南北两侧转折应力集中部位,受地层、背斜和断裂三者联合控制。Zhaishang gold deposit exposes middle Devonian and lower Permian,the former divide into four lithologic segments and the latter divide into two lithologic segments.North ore belt distribute in the first lithologic segment of lower Permian,north wing of anticline,and south ore belt distribute in the first lithologic segment of middle Devonian,core of anticline.The formation and distribution of ore veins are controlled by lithologic differences,ore veins produce in the contact interface of soft and hard rock,the vein occurrence has obvious inheritance with wall rock.Structure is composition of anticline,main fault and contain ore fault.Zhamashu anticline has the characteristics of north thin,slow and north wing normal,and south thick,steep and south wing reverse,NW trend,turn west to nearly EW,show＂S＂shape.The main fault and contain ore fault are controlled by anticline,formation with the secondary deformation of anticline.ore veins clamp between the main fault,and distribute in the focus area of transition stress of north and south sides of anticline,and it is controlled by stratum,anticline and fault jointly.

关 键 词：寨上金矿 地层 断裂 背斜 控矿因素 甘肃省 

分 类 号：P618.51[天文地球—矿床学]