广东省博罗县横河钠长石矿构造岩浆演化及成矿机理  

Tectonomagmatic Evolution and Mineralizing Mechanism of the Henghe Albite Mine in Boluo County,Guangdong Province

作　　者：李文辉 钟晓清 张苑平[2] 刘师先 

机构地区：[1]广东省地质科学研究所,广东广州510080 [2]湖南省遥感中心,湖南长沙410007

出　　处：《大地构造与成矿学》2010年第1期71-77,共7页Geotectonica et Metallogenia

摘　　要：通过对广东省博罗县横河超大型钠长石矿床、锡铌钽矿化带和金矿化带野外勘查和室内微观分析,发现岩浆随着构造演化而分异自交代成矿的特殊新颖现象。研究表明该矿区在不同的构造旋回中构造应力场的主压应力方向不同,持续构造压应力作用下发生不同构造序次,岩浆也随构造应力场的演化而分异。燕山构造旋回控制的早期第三阶段岩浆,结晶分异和气液分异导致强烈岩浆自交代形成超大型钠长石矿床;燕山构造旋回控制的晚期岩浆,随着构造演化产生云英岩化、石榴子石化等岩浆自交代而锡铌钽矿物结晶富集成矿;燕山构造旋回最晚期的北北西向、北北东向、北西向断裂,控制岩浆热液期的金矿化带。即本矿区经构造岩浆演化分异,发生岩浆自交代至热液蚀变演化系列成矿机理。Based on the field exploration and indoor microscopic analysis of a superlarge albite deposit,mineralized zones of Sn-Nb-Ta and Au in Boluo County of Guangdong Province,a new kind of special phenomenon that differentiation and autometasomatism of magma occurs along with tectonic evolution,has been discoveried.Researches indicate that the orefield＇s principal compressive stress direction of tectonic stress field in the orefield is not identical in different tectonic cycles,and it contains various tectonic orders under a continuous tectonic compressive stress,meanwhile magma differentiates along with the stress field evolution.Autometasomatism emerged from the 3rd Yanshanian magmas in early phases and formed a superlarge albite deposit by way of crystallization and pneumohydraulic differentiation.The Yanshanian magmas in late phases,gave rise to sericitization and garnetization,and then Sn,Nb and Ta were enriched due to magmatic-authometasomatism.Yanshanian NNW,NNE and NW faults,control mineralized zones of Au in the magmatic hydrothermal stage.In a word,the mine was formed with evolution and differentiation of tectonomagmatism,the mechanism of mineralization and evolutional series from magmatic autometasomatism to hydrothermal alternation have been determinated.

关 键 词：构造岩浆 演化分异 岩浆自交代热液成矿 

分 类 号：P542[天文地球—构造地质学] P581[天文地球—地质学]