河北洞子沟银铜多金属矿床地质特征及成因分析

The Geological characteristics and genetic analysis of the Dongzigou silver (copper) polymetallic deposit in Hebei province

洞子沟银铜多金属矿床产于华北克拉通北缘长城系常州沟组地层中,受地层控制明显。通过对该矿床地质特征及矿石的稀土元素地球化学特征、矿物流体包裹体特征、硫氢氧同位素组成及U-Pb同位素年代研究表明:成矿物质来源于幔源;矿床形成于古元古代晚期华北克拉通吕梁运动后的伸展裂解过程中,在断陷盆地接受沉积的同时,有沿同生断裂上升的幔源热液、银铜金铅锌等成矿物质组分与常州沟组陆源碎屑一同沉积,形成洞子沟银铜多金属沉积层控型矿床。

Dongzigou silver(copper)polymetallic deposit is located in the stratum of Changzhougou Formation of Changcheng System at the north margin of the north China craton.It is a strabound ore deposit.Characteristics of the deposit,geochemical characteristics of REE of the ore,fluid inclusion characteristics,S-H-O isotopes and U-Pb chronology are studied.The results show that the ore materials are derived from mantle and the deposit is formed during the post Lvliang movement extension and splitting of the north China craton in the late palaeo-Proterozoic Era.The fault basin receive sediments and the mantle-sourced hydrothermal fluid move up along the syn-sedimentation fault and syn-sedimentation of Ag,Cu,Pb,Zn etc.and terrestrial materials take place and Dongzigou silver(copper)polymetallic deposit is formed.