地质学报2017，Vol.91Issue(2)：411-420,10.
钦杭成矿带南段粤西大金山地区的区域地球化学特征与成矿规律探讨
Geochemical Features and Metallogenic Regularity of the Dajinshan Area in the South Segment of the Qinzhou-Hangzhou Metallogenic Belt, Western Guangdong
摘要
Abstract
The Dajinshan area of Guangdong province,located in the Dajinshan rotating tectonic belt,is the important metallogenic prospect area for S,Ag,Pb,W,Sn and Au.This area contains many mines and mineralization types and wide distribution of metallogenic belt.The 1 ∶ 50000 stream sediment survey presents a ring-shaped composite anomaly which is 35 km long and 2～5 km wide and covers an area of about 220 km2.The elements found in this area are W,Sn,Bi,Mo,Pb,Zn,Ag,Au and etc.,being characteristic of complex element combination,large scale and high anomaly.The main mines surrounding around the Dajinshan tectonic belt contain the Dajinshan W-Sn ore field,the Dajingping pyrite ore field,the Gaocheng Ag-Pb-Zn ore field,the Jiuquling Sn ore field and the Shimentou Pb-Zn ore field.This paper,based on the geochemical anomaly and characteristics of typical deposits,yielded the following understanding.(1) With the dome as the center of the Dajingshan area,the ore-forming elements from the inside to the outside forms regular horizontal zoning:W,Sn,Bi→Sn→Sn,Pb,Zn,Ag→Ag,Pb,Zn(Au) →Au;(2) the vertical zoning of W-Sn and Pb-Zn deposits is clear;(3)W-Sn-Pb-Zn-Ag deposits formed in late Yanshanian.On the basis of the recognition above,the paper established the metallogenic model of the Dajinshan area.The shallow metamorphic rock series formed by Sinian submarine volcano plume(gas) activity provided the source material for the deposits;in early Yanshanian movement,the Dajinshan rotating tectonic belt was formed by sinistral rotation of two regional-scale northeast-trending faults;the late Yanshanian magmatic activity resulted in the expansion of the Dajinshan rotational tectonic belt and drove the deep-sourced hydrothermal fluids carrying part of ore-forming materials such W to dissolve the Sn,Pb,Zn and Ag elements of the Daganshan Formation,and finally these elements precipitated in the various fractures in the tectonic system.关键词
大金山地区/元素分带/矿床特征/分布规律/成矿模式Key words
Dajinshan area/element zoning/deposit features/distributions/metallogenic model引用本文复制引用
郭敏,曾钧跃,罗大略..钦杭成矿带南段粤西大金山地区的区域地球化学特征与成矿规律探讨[J].地质学报,2017,91(2):411-420,10.基金项目
本文为中国地质调查局地质矿产调查评价项目(编号1212011085405、1212011220816)资助成果. （编号1212011085405、1212011220816）
