粤东地区官田含铜碲黄铁矿矿床的火山热液成因

A Study of the Volcano-Hydrothermal Genesis of the Guantian Cu-Te-bearing Pyrite Deposits,Eastern Guangdong

本文从矿床成矿地质背景角度,讨论了粤东地区官田矿床地质地球化学特征及其与火山热液作用的成因联系。阐述了矿区矿化元素分带的原因。研究表明,火山热液是矿床形成的主导因素,它与复式杂岩体演化晚期气液相遇运移至断裂破碎带形成含铜碲黄铁矿矿床。在含矿热液运移过程中有大气降水加入,发生了强烈的水岩交换,产生大面积的黄铁绢英岩化。随着温度的降低,热液运移至金鸡群萃取了碎屑岩内的Pb、Zn元素,形成了湖洋坑铅锌矿床。

Starting with the study of geological background,the present paper deals with the Guantian Cu- Te-bearing pyrite deposit in East Guangdong in terms of its geochemical characteristics and relation to volcanic events, and eventually gives a clear idea of its zonation of mineralizing elements. The research reveals that volcanic hydrothermal solution was a key to the origin of the deposit when it was mixed with gas or liquid caused by late evolution of complexes and then moved into a series of faults. In the course of movement, the solution was joined by much meteorological water,leading to intensive pyrite-quartz sericitization,and extracted such elements as Pb,Zn,etc. from the bypassed detrital rocks with the decrease of temperature, promoting Pb-Zn mineralization in the north. Accordingly, zonation of mineralizing elements was created from south to north.