| 东昆仑五龙沟金矿床成矿热历史的裂变径迹热年代学证据 |
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| 引用本文：袁万明,王世成,王兰芬.2000.东昆仑五龙沟金矿床成矿热历史的裂变径迹热年代学证据[J].地球学报,21(4):389-395. |
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| 基金项目:中国博士后科学基金，中国科学院核分析技术开放研究实验室资助 |
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| 中文摘要:本文将取自五龙沟地区3个金矿体(区)的锆石和磷灰石进行裂变径迹热年代学分析，实测锆石裂变径迹年龄为197.4～235.0Ma，实测磷灰石年龄为200.5Ma，磷灰石校正年龄为244Ma，这与已有的RbSr和KAr同位素年龄范围207.1～252.9Ma基本一致，代表了相应温度时的成矿时代。热历史模拟结果显示，矿区主要经历了2次升温和降温过程，不仅体现了成矿作用的长期性，而且体现了成矿作用多期次的特征，各矿体矿石中锆石的裂变径迹年龄相差较大亦是佐证，并且符合多期次成矿的地质特征。 |
| 中文关键词:裂变径迹热年代学 热历史 成矿时代 金矿床 东昆仑 |
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| Metallogenic Thermal History of the Wulonggou Gold Deposits in East Kunlun Mountains in the Light of Fission Track Thermochronology |
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| Abstract:The Wulonggou gold ore district lies in the northern part of Qinghai Tibet plateau.The investigation of the metallogenic thermal history and ore forming epochs of gold deposits is of great significance both in theory and in prospecting practice.This paper reports the analysis of fission track thermochronology of zircon and apatite from three gold deposits in Wulonggou area as a new method for studying mineralization.The measured zircon fission track ages range from 197.4 Ma to 235.0 Ma,an apatite fission track age is 200.5 Ma,whose corrected age,however,is 244 Ma.These fission track ages accord basically with the 207.1～252.0 Ma Rb Sr and K Ar isotopic ages of the ore deposits and reflect the metallogenic age in the corresponding temperature.Thermal history modeling results reveal that the gold district went through two events of ascending temperature and also two events of descending temperature,indicating both protracted nature of the metallogenesis and multiperiodic character of mineralization.There are obvious differences between zircon fission track ages of three gold deposits,which is confirmed by geological characteristics of the ore district. |
| keywords:fission track thermochronology thermal history metallogenic age gold deposit East Kunlun Mountains |
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