摘要
内蒙古碾子沟石英脉型钼矿床是一新发现的钼矿床,通过对主要钼矿体6件辉钼矿样品的Re-Os同位素分析,获得了150.2±2.2～154.4±2.2Ma之间、平均152.4±1.3Ma(2σ误差,MSWD=1.6)的同位素模式年龄,及一个相关性很好的等时线年龄154.3±3.6Ma(2σ误差,MSWD=1.9),表明碾子沟钼矿床形成于晚侏罗世,属中国东部燕山期大规模钼成矿期成矿,是中国东部中生代构造体制大转折背景下的产物。碾子沟钼矿床辉钼矿的铼含量介于12.6×10^(-6)～37.0×10^(-6),平均24.9×10^(-6),通过与其它钼矿床对比,初步认为碾子沟钼矿床成矿物质具有壳幔混源、偏壳源特征。
The Nianzigou Mo deposit, Inner Mongolia, is a recently discovered large-quartz veins type Mo deposit. Six samples of molybdenite for Re-Os isotopic dating are analyzed and the model ages obtained from 150.2 +/- 2.2 to 154.4 +/- 2.2Ma, averaging 152.4 +/- 1.3Ma(2 sigma MSWD=1.6), and a good isochronic age of 154.3 +/- 3.6Ma(2 sigma, MSWD=1.9). It is indicated that the Nianzigou Mo deposit was formed in the Late Jurassic which belongs to the large-scale Yanshan molybdenum metallogenic period, and the tectonic settings are Mesozoic tectonic regime transformation of eastern China. The Re contents of the molybdenite are 12.6X10(-6) to 37.0x10(-6), averaging 24.9X10(-6). According to the contents of Re in Nianzigou and contrasting with other molybdenum-bearing deposits, we consider the ore-forming materials of Nianzigou Mo deposit are derived from the crust-mantle mixed source and mainly from the crustal source.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第1期212-218,共7页
Acta Petrologica Sinica
基金
国家重点基础研究项目(2006CB403507)资助,
关键词
RE-OS同位素测年
碾子沟钼矿
西拉沐沦钼矿带
内蒙古
Re-Os isotopic dating
Nianzigou Mo deposit
Xilamulun molybdenum metallogenic belt
Inner Mongolia
