内蒙古北山北带斑岩型矿床特征与成矿系统分析
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摘要
笔者运用成矿系统理论,从控制矿床形成保存的全部地质要素和成矿作用过程等一般矿床学研究入手,从宏观上将成矿时间、空间、物质、运动等要素有机结合,对内蒙古北山北带会聚型陆缘斑岩成矿系统进行了分析研究。
     通过对比研究认为,内蒙古北山北带为会聚型板块边缘,属于塔里木—哈萨克斯坦联合板块北部陆缘增生带。随着古亚洲洋板块消减于塔里木—哈萨克斯坦联合板块之下,古亚洲洋逐渐闭合,最终导致塔里木—哈萨克斯坦联合板块与西伯利亚板块发生陆陆碰撞造山。使北山北带成为了斑岩型矿床形成的有利地带。
     本文对小狐狸山斑岩型钼多金属矿床等3个典型矿床进行了剖析,对比研究了小狐狸山等矿床级别的斑岩型成矿亚系统,提出该成矿亚系统成矿作用过程由成矿物质供应子系统、成矿流体子系统、成矿能量子系统、成矿空间子系统、矿床形成变化保存的时间子系统等5个子系统有机结合而成。
     在剖析典型矿床的基础上总结了北山北带会聚型陆缘斑岩成矿系统各子系统的基本构成和总体特征;建立了北山北带区域性斑岩型矿床的成矿模式、区域矿化网络、区域成矿系统结构。
     研究发现,本区北西西向、北西向断裂构造与北东向断裂构造相互交切形成的网格状构造组合构成了内蒙古北山北带区域矿化网络的主体格架,各构造节点具有明显的控岩控矿作用,目前已发现的矿床(点)均分布于网络格架的节点附近。
     通过研究区域成矿规律和成矿区带的划分,总结了北山北带斑岩型矿床的六个找矿标志,初步建立了该类型矿床的找矿模型,确定了由面到点、由表里、由浅入深、循序渐进的找矿思路,提出了该地区寻找斑岩型矿床的技术方法组合。
     圈定了甜水井-流沙山钼、金、铜、铁找矿靶区、额勒根乌兰乌拉-乌珠尔嘎顺钼、铜、铁找矿靶区、高石山—小狐狸山铜、钼、金、铅、锌、稀有金属找矿靶区等3个找矿靶区,明确了各找矿靶区的主攻矿种主攻矿床类型。为内蒙古北山北带今后的找矿工作提供了参考意见,体现了成矿系统理论与生产实践的有机结合。
This paper guided by the theory of Metallogenic System, started with generalstudy of mineral deposit, which included the essential geologic factors of controllingdeposits formation to preservation and metallogenic process. By integrated theelements of mineralization time, space, material, and transport, the authorcomprehensively discussed the porphyry metallogenic system in north belt of theBeishan Mountain, Inner Mongolia.
     The north belt of the Beishan Mountain was convergent continental margin,which belonged to the northern margin accretion zone of Tarim-Kazakhstan joint plate.With the Paleo-Asian Ocean plate subducted to Tarim-Kazakhstan joint plate, thePaleo-Asian Ocean gradually closed, and eventual led to continent-continent collisionorogeny of the Tarim-Kazakhstan joint plate and the Siberian plate. This evolutionmade the north belt of the Beishan Mountain became a beneficial area ofporphyry-type deposits formation.
     The author analyzed three typical deposits included Xiaohulishan porphyrymolybdenum polymetallic deposits, contrasted study of the deposit-level porphyrymetallogenic system like Xiaohulishan deposit, proposed that the mineralizationsystem was organic combined by the five subsystem: the metallogenic material supplysubsystem, the ore-forming fluid subsystem, the ore-forming energy subsystem, theore-forming spatial subsystem, and the post-ore change-preservation temporalsubsystem.
     Based on the typical ore deposits study, the author summarized the basicstructure and general characteristics of each subsystem in the north belt of the BeishanMountain convergent continental margin metallogenic system, established theprospecting model, mineralization network, metallogenic system structure of theregional porphyry deposits in north belt of the Beishan Mountain.
     The study results showed that NWW-NW and NE faults cross-cut to form agrid-like structure constituted the main framework of regional mineralization networkin the north belt of the Beishan Mountain, Inner Mongolia. Each structure joint wasbeneficial lithology and ore controlling place. All the discovered mineral deposits (orore occurrences) are located near the network framework.
     After divided the regional metallogenic regularity and metallogenic belts, the author summed up six prospecting criteria of porphyry type deposits in north belt ofthe Beishan Mountain, preliminary established the prospecting model of this typedeposits, determined the“point to region, surface to depth, follow in proper sequence”prospecting idea, proposed the technical method in search of porphyry-type oredeposits in this area.
     The author delineated three prospecting targets: Tianshuijing-LiushanshanMo-Au-Cu-Fe area, Erlegenwulawula-Wuzhuergashun Mo-Cu-Fe area andGaoshishan-Xiaohulishan Cu-Mo-Au-Pb-Zn-Rare Metal area, confirmed the mainmineral resources and ore deposits in each prospecting target. This study offers veryuseful reference for future prospecting work in north belt of the Beishan Mountain,and reflects the organic combination of the Metallogenic System and prospectingpractices.
引文
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