安徽庐枞盆地东北部火山机构与金的背景值关系研究

STUDES OF RELATION BETWEEN VOLCANIC STRUCTURES SND BACKGROUND CONTENTS OF GOLD IN THE NORTHEASTERN LUJINGG-ZONGYANG BASIN,ANHUI PROVINCE

安徽庐（江）枞（阳）火山岩盆地东北部地区金的背景值明显地受不同级别火山机构控制。矾山－黄屯－级火山机构形成的火山岩建造，其含金值均较低；盆地内小岭和钟子山二级火山机构形成的火山岩建造，其含金值明显很高。黄铁矿化、铁矿化和次生石英岩化有利于金的富集，二级火山机构均为隐爆角砾岩筒，岩浆热液活动强烈；一级火山机构为裂隙中心式喷发，热液活动很弱。岩浆热液活动的程度是导致不同火山机构控制的火山岩建造金的背景值明显差异的根本原因。

The hackground contents of gold are obviously con trolled by volcanic structures with different grade innortheastern Lujing- Zongyang volcanic basin,Anhui Province,Lower background contents of gold in volcanicformations were found in Fanshan-Huangton first-class volcanic structure,but in Xiaoling and Zhongzishan sec-ond-class volcanic structures in the basin ,the gold content in volcanic formations is very high.Pyritization,ironmineralization and quarizification benefit the enrichment of gold.Second-class volcanic structures are cryptoex-plosive breccia pipes with strongly magmatic hydrothe rmal activities with first-class volcanic structure beingeruption of fissure-central type with weakly hydrothermal activities.Intensity of hydrothermal activities being theessential reason of different background contents of gold in volcanic formations controlled by volcanic structureswith different grade.