矿床地质2011，Vol.30Issue(3)：385-402,18.
西天山查岗诺尔铁矿矿床地质特征及矿床成因研究
Geological characteristics and genesis of Chagannur iron deposit in Western Tianshan,Xinjiang
摘要
Abstract
The Chagannur iron ore district is located in the Boluohonu Mountain situated in northeast Ili Block in western Tianshan, belonging to the active continental margin on the northern side of the Middle Tianshan Plate. The iron deposit lies on the northwest fringe of the volcanic crater, and the attitude of the ore body is restricted by the volcanic dome structure. Wall rocks, mainly consisting of andesite and andesitic volcaniclastic rock, belong to Dahalajunshan Formation. The formation of the ore deposit can be divided into magmatic ore-forming period and hydrothermal metallogenic period, with the former being dominant. Cryptoexplosion occurred duringthe whole metallogenic period. Some kinds of ores were formed during the magmatic ore-forming period, such as scum ore, spotted ore, massive ore, injection and breccia ore and shadow ore. Lots of ores were formed in the hydrothermal metallogenic period, such as symmetrical banding ore, multi-breccia ore and network ore. The REE distribution patterns of the samples are similar to each other, showing obvious enrichment of light REE (LREE) and large ion lithophile elements (LILE) and evident depletion of Nb and Ta in the primitive mantle normalized spider diagrams. Ores and andesite have similar REE fractionation patterns and trace element frac-tionation patterns. Pb isotopic ratios of ores and andesite show linear correlation in the Pb isotopic ratio graph, and there are varying amounts of magnetite in andesitic volcanic rocks. These characteristics suggest affinity between ores and volcanic rocks. Oxygen isotopic data range of ores is consistent with the variation range of typical magmatic deposits. Hence, this iron deposit is mainly of polygenetic magmatic type and subordinately of hydrothermal type in genesis, with the andesitic magma as the primary magma关键词
地质学；地球化学；矿床地质特征；岩浆矿床；矿床成因；查岗诺尔铁矿；西天山；新疆Key words
geology/geochemistry/characteristics of iron deposit/magmatic deposit/genesis of ore deposit/Chagannur iron deposit/Western Tianshan/ Xinjiang分类
天文与地球科学引用本文复制引用
汪帮耀,胡秀军,王江涛,邵青红,凌锦兰,郭娜欣,赵彦锋,夏昭德,姜常义..西天山查岗诺尔铁矿矿床地质特征及矿床成因研究[J].矿床地质,2011,30(3):385-402,18.基金项目
本文得到中央高校基本科研业务费专项资金(编号：CHD2010JC089)、长安大学基础研究支持计划专项基金和中国地质调查局项目“西天山阿吾拉勒成矿带铁矿成矿条件、成矿规律与勘查示范研究(编号：资[2010]矿评01-03-26)”的联合资助 （编号：CHD2010JC089）
