投稿时间：2014-02-12
修订日期：2015-03-10
网络发布日期：2015-05-06
中文摘要:新疆琼河坝位于准噶尔成矿带东段, 是一个潜在的以铁、铜、金为主的矿集区。区内铁矿床(点)众多, 以往的找矿和研究工作大多聚焦于矽卡岩型富铁矿, 对其他类型的铁矿床缺乏足够的重视。为了拓宽琼河坝地区铁矿床勘查思路, 需要对区内铁矿床的类型和成矿特征进行系统归纳。文章在野外调查和室内测试分析的基础上, 依据矿床(点)的产出地质环境、矿体及矿石矿物成分特征, 结合铁矿石主要矿物的主量、微量及稀土元素特征, 将琼河坝地区铁矿床划分为矽卡岩型、火山岩型、岩浆分异型、火山间歇期沉积型和湖相沉积型5种类型。矽卡岩型、火山岩型、岩浆分异型和火山间歇期沉积型铁矿赋存在晚古生代泥盆纪—石炭纪火山岩中, 湖相沉积型铁矿床赋存于中侏罗统湖沼相含煤碎屑沉积岩中。火山间歇期沉积型铁矿床是在琼河坝地区首次发现的新类型, 矿体赋存部位、矿石颗粒磨圆度及胶结成分特征均显示了该类铁矿成矿作用的特殊性。从找矿角度分析, 目前主攻方向为矽卡岩型铁矿, 而火山岩型铁矿是下一步找矿研究的重点。
Abstract:Xinjiang Qiongheba area is a potential Fe-Cu-Au ore concentration area located in the eastern section of Junggar metallogenic belt. There are many iron ore deposits or occurrences in this area, yet previous prospecting and research mostly focused on high-grad skarn type iron ore deposits, as well as lack of sufficient attention to other types iron ore. In order to widen the thought of iron ore exploration in this area, systematic induction on the types and mineralization characteristics of iron ore must be carried out. In this paper, we have conducted field survey and laboratory tests, and analyzed the characteristic of geological environment, ore bodies and ore mineral composition, and combined with the characteristic of the major elements, trace elements, rare earth elements of iron ore. These iron ore deposits can be divided into five types: skarn type, volcanic type, magmatic differentiation type, detritus sedimentary type, lacustrine sedimentary type, The first four iron deposit types occur in the Devonian and Carboniferous volcanic rocks, and the last type occur in clastic sedimentary rocks, which formed in coal-bearing lacustrine environment during the Middle Jurassic period. The detritus sedimentary type is a new type of first discovered in Qiongheba, whose ore body location, psephicity of ore particles and agglutinates show the special mineralization. From ore prospecting perspective, the skarn type with great economic value is the main prospecting direction at present. Besides, volcanic type iron ore is the key type for further exploration.
keywords:geochemistry iron deposit type mineralization characteristics metallogeny detritus sedimentary type Qiongheba Xinjiang
文章编号：
中图分类号：P618.31
文献标志码：
基金项目:本文得到中国地质调查局地质矿产评价项目(编号: 1212011085024)、新疆维吾尔自治区地质勘查基金项目(编号:A11-3-XJ4)和"十一五"国家支撑计划项目(编号: 2006CB412600)联合资助
引用文本：
孟贵祥,严加永,杨岳清,赵金花,邓震,吴建,李高峰.2015.新疆琼河坝地区铁矿床类型及其成矿特征[J].矿床地质,34(2):361~378MENG GuiXiang,YAN JiaYong,YANG YueQing,ZHAO JinHua,DENG Zhen,WU Jian,LI GaoFeng.2015.Iron deposit types and metallogenic characteristics in Qiongheba area, Xinjiang[J].Mineral Deposits34(2):361~378
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