학술논문
广东潮安飞鹅山钨钼多金属矿床辉钼矿Re-Os 同位素定年 / Molybdenite Re-Os Isotopic Age of Fei’eshan Tungsten and Molybdenum Polymetallic Deposit in Chao’an,Guangdong
Document Type
Academic Journal
Author
李海立; 肖惠良; 范飞鹏; 陈乐柱; 刘建雄; 陈叙涛; LI Haili; XIAO Huiliang; FAN Feipeng; CHEN Lezhu; LIU Jianxiong; CHEN Xutao
Source
地质学报. 90(2):231-239
Subject
Language
Chinese
ISSN
0001-5717
Abstract
广东潮安飞鹅山钨钼多金属矿床是近年来在粤东地区新发现具有重要找矿远景的矿床之一。区内燕山期岩浆活动强烈，断裂构造活动频繁。飞鹅山钨钼多金属矿体主要赋存于燕山期花岗岩及云英岩中，主要矿床类型有石英脉型和云英岩型两种，石英脉型矿体主要受北东向及近南北向断裂构造控制，云英岩型矿体则主要受云英岩化蚀变控制。本次通过对该矿床矿体中6个辉钼矿样品 Re-Os 同位素测试分析，获得了 Re-Os 模式年龄为136．5～142．3Ma，187 Re-187 Os 等时线年龄为142．6±6．3Ma，MSWD 的值为1．9，加权平均年龄为139．4±2．2Ma，MSWD 的值为4．0。分析结果表明该矿床的成矿时代与区域成矿事件相吻合；Re／Os 比值（＞4）及 Re 同位素含量（0．07×10－6～0．12×10－6）指示了成矿物质来源于地壳，矿床为燕山早期第三阶段重熔花岗岩分异演化与期后热液共同作用的产物。
The Fei ’eshan tungsten and molybdenum polymetallic deposit located in the eastern region of Guangdong province is a prospecting potential deposit newly discovered.Intense tectonic and magmatic activities are frequent during Yanshanian in this area.The ore bodies occur mainly in granite and greisens, which controlled by faults of NE and SN and the types of deposit contain quartz vein type and greisens type.Re-Os isotopic dating of six molybdenite samples collected from the main ore body in Fei’eshan deposit show that a)the model age is from 136.5Ma to 142.3Ma,b)the isochron age is 142.6 ±6.3Ma, and c)weighted average of model age is 139.4±2.2Ma.It can thus be considered that the deposit formed in the third stage of Early Yanshanian and ore-forming age is consistent with the monzonitic granite in orefield.According to the rhenium content and the ratio of rhenium and osmium of molybdenum samples, origin of the ore-forming materials of the deposit derived from the crust.Besides,through combined with some isotopic ages of other deposits in adjacent area,it can be inferred that the metallogenic materials of the Fei’eshan deposit originated from the highly evolved melting type Yanshanian granite mass.
The Fei ’eshan tungsten and molybdenum polymetallic deposit located in the eastern region of Guangdong province is a prospecting potential deposit newly discovered.Intense tectonic and magmatic activities are frequent during Yanshanian in this area.The ore bodies occur mainly in granite and greisens, which controlled by faults of NE and SN and the types of deposit contain quartz vein type and greisens type.Re-Os isotopic dating of six molybdenite samples collected from the main ore body in Fei’eshan deposit show that a)the model age is from 136.5Ma to 142.3Ma,b)the isochron age is 142.6 ±6.3Ma, and c)weighted average of model age is 139.4±2.2Ma.It can thus be considered that the deposit formed in the third stage of Early Yanshanian and ore-forming age is consistent with the monzonitic granite in orefield.According to the rhenium content and the ratio of rhenium and osmium of molybdenum samples, origin of the ore-forming materials of the deposit derived from the crust.Besides,through combined with some isotopic ages of other deposits in adjacent area,it can be inferred that the metallogenic materials of the Fei’eshan deposit originated from the highly evolved melting type Yanshanian granite mass.