铅锌矿床类型划分评析

对铅锌矿类型的划分,主要有以成矿温度结合深度和典型矿物组合为基础、以围岩或含矿岩系为基础、以成因为基础、以综合矿床因素为基础、以含矿岩系结合矿床成因为基础的若干划分方案,各具特色,又有不完善之处。从反映客观地质规律和体现矿床内在差异和外在可把握的标志的原则出发,尝试将铅锌矿按成矿系统划分为岩浆、热液(水)、沉积、叠加改造4大类,再据成矿环境,围岩类型及蚀变,成矿时代,流体包裹体,铅、硫同位素,成矿条件等特征进一步划分出9个亚类。

ANALYSIS ON THE CLASSIFICATION OF LEAD-ZINC DEPOSITS

There are some different classification plans of Lead-Zinc deposits,which vary greatly from principles to methods and imperfect. Most of them are based on: ①combining ore-forming temperature with depth and typical mineral assemblages,②wall rock or ore-hosting rock formation,③genesis,④ deposit’s comprehensive factors ,⑤combining ore-hosting rock formation with genesis. Based on the principle of Lead-Zinc deposits classification ,which can reflect the external geological rules and reveal the inherent difference and exterior indicators of Lead-Zinc deposits,and the metallogentic system theory,Lead-Zinc deposits are divided into magma ,hydrothermal ,sedimentary and superimposition 4 supergroups . And then,according to the mineralizing environment ,wallrock type and alteration,metallogentic age,fluid inclusion ,lead and sulfur isotope and the metallogentic conditions,Lead-Zinc deposits are divided into 9 groups.