投稿时间：2014-07-04
修订日期：2014-12-30
网络发布日期：2015-03-04
中文摘要:苏云河钼矿床位于新疆西准噶尔巴尔鲁克山西段,容矿岩石为二长花岗岩和二长花岗斑岩。这些花岗岩具有类似的地球化学特征:富集Rb、Th、U和LREE,相对亏损Ba、P、Ti,属于高钾钙碱性I型花岗岩系列,局部经历过强烈的分离结晶作用。LA-ICPMS锆石U-Pb定年结果显示苏云河钼矿区的成岩年龄为309.3~310.2 Ma,这表明与成矿有关的岩浆活动发生于晚石炭世。黑云母的Ti温度计表明Ⅰ号和Ⅲ号岩体的结晶温度相近,为695~728℃;而Ⅱ号岩体的结晶温度较低,为642~668℃。同时根据角闪石-斜长石压力计获得Ⅰ号和Ⅲ号岩体的结晶压力为(3.0~3.9)×108 Pa。综合地球化学研究表明,苏云河钼矿区3个岩体均形成于岛弧环境。此外,以苏云河钼矿床为代表的巴尔鲁克山成矿带与哈萨克斯坦境内的巴尔喀什成矿带在岩石地球化学、成岩成矿时代等方面具有许多类似的特点,表明巴尔鲁克山成矿带可能是巴尔喀什成矿带在中国境内的延伸。
Abstract:The Suyunhe Mo deposit, located in western Barluk Mountain of West Junggar Basin, consists of three granitic stocks. These granites share similar geochemical fe atures. They are characterized by high content of Rb, Th, U, LREE, and relatively negative anomalies of Ba, P, Ti, suggesting I-type granites. Data from some sa mples indicate that the granites have undergone fractional crystallisation. The results of LA-ICPMS zircon U-Pb dating indicate that the magmatism in the Suyunh e Mo deposit occurred in Late Carboniferous (309.3~310.2 Ma), which was rela ted to the Mo mineralization. The biotite Ti thermometry suggests that the cryst al temperatures of stock Ⅰ and Ⅲ are 704~739℃, whereas the crystal temperatur es of stock Ⅱ (659~681℃) are lower. Meanwhile, the amphibole-plagioclase baro meter indicates that the pressures of stock Ⅰ and Ⅲ are (3.0~3.9)×108 Pa. Both mine ral chemistry and petrogenesis studies suggest that the three stocks formed in an is land-arc setting. In addition, the Barluk metallogenic belt, represented by the Suyunhe Mo deposit, is similar to Balkhash metallogenic belt in geochemistry and geochoronology, suggesting that the Balkhash metallogenic belt probably extends eastward to the Barluk metallogenic belt.
文章编号：
中图分类号：P618.75
文献标志码：
基金项目:本文得到中国科学院知识创新工程项目(编号:KJZD-EW-TZ-G07-1)、国家自然科学基金项目(编号:U1303293,41390441,41272109)和国家科技支撑计划305项目(编号:2011BAB06B01)的联合资助
引用文本：
钟世华,申萍,潘鸿迪,郑国平,鄢瑜宏,李晶.2015.新疆西准噶尔苏云河钼矿床含矿岩体地球化学和年代学[J].矿床地质,34(1):39~62ZHONG ShiHua,SHEN Ping,PAN HongDi,ZHENG GuoPing,YAN Yu Hong,LI Jing.2015.Geochemistry and geochronology of ore-bearing granites in Suyunhe Mo deposit, West Junggar, Xinjiang[J].Mineral Deposits34(1):39~62
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