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新疆可可托海3号伟晶岩脉成岩时代的限定:来自辉钼矿Re-Os定年的证据/New age constraints on Koktokay pegmatite No.3 Vein, Altay Mountains, Xinjiang: Evidence from molybdenite Re-Os dating[J]
Authors
LI Chao
LI Qiang
+11 more
LIU Feng
QU WenJun
ZHANG ZhiXin
中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室,北京,100037
中国科学院新疆生态与地理研究所新疆矿产资源研究中心,新疆乌鲁木齐,830011
刘锋
国家地质实验测试中心,北京,100037
屈文俊
张志欣
李强
李超
Publication date
1 January 2012
Publisher
Abstract
可可托海3号伟晶岩脉因其完美的岩浆结晶分异特征而闻名世界,但针对其年代学方面的认识仍存在较大分歧.本次工作采集到产于3号脉边部带中的6件辉钼矿样品.其产出地质特征显示属于3号伟晶岩脉边部带形成时与围岩的热液交代成因,形成时间应与边部带近于同时或稍晚.文章利用辉钼矿Re-Os测年技术进行的年代学研究结果表明,6件辉钼矿Re-Os等时线年龄为(208.8±2.4) Ma(MSWD=0.89)以及模式年龄为(209.9±1.3) Ma(MSWD=0.69),在误差范围内一致,可忽略辉钼矿Re-Os体系可能产生的失偶现象,代表了辉钼矿在流体中沉淀的时间.在研究前人年代学成果基础上,笔者认为3号伟晶岩脉的形成起始于209Ma左右,即中三叠世晚期
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Last time updated on 29/11/2016