河北承德大庙铁矿床地质构造特征与找矿预测
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

危机矿山接替资源找矿项目(编号:20089950)、地质调查项目(1212011220936、12120114032401)和公益性行业科研专项(编号:201011077)


Geological characteristics of the Damiao iron deposit, North China Craton and ore-prospecting
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    大庙斜长岩杂岩体位于华北克拉通北缘,是我国唯一岩体型斜长岩杂岩体,赋存了丰富的Fe-Ti-P矿床。对该杂岩体的岩石学、矿床成因研究已经较为深入,但是矿田构造研究较为薄弱。本文主要从大庙矿床地质特征分析入手,通过控矿构造分析和成矿期构造应力场的恢复,结合成矿特征分析,建立大庙矿床找矿预测模型,开展找矿预测。在大庙杂岩体内,先后找到了大庙、黑山、马营和罗锅子沟等中-大型矿区,它们都具有典型的岩浆矿床特征,具有岩浆熔离、分异和贯入式成矿特征;系统的野外地质调查和翔实的构造解析表明,大庙杂岩体的侵位受控于EW向隆化-平泉和大庙-红石砬子的断裂构造,杂岩体内NE和NW向两组断裂构造控制了杂岩体内铁-铁磷矿带的发育,NS向断裂则主要为成矿后构造,往往错断了铁矿体。在黑山矿区,野外观测发现含矿苏长岩利用了固结斜长岩中发育的节理,呈脉状贯入,在节理交汇部位铁矿体变大变富;通过节理和矿脉走向的详细测量和吴氏网统计分析,推测大庙矿区成矿期含矿苏长岩的侵位受控于区域上近似NS向的挤压应力作用。根据大庙杂岩体的岩浆侵位时代、岩相-矿体的接触关系、控矿构造和成矿特征,复原了大庙杂岩体的成矿-构造演化过程:最早期区域构造活动控制了斜长岩的侵位,没有发生矿化;苏长岩的侵位,伴随发生了早期的结晶分凝式矿化;块状苏长岩的侵位导致了晚期的熔离-贯入式矿化的形成;成矿期后,大庙杂岩体还经历了多期次的构造变动、抬升和剥蚀。在此基础上,建立了大庙铁矿床的找矿预测模型,并系统分析了大庙矿田不同矿区的深部和外围的找矿潜力,认为黑山和大庙矿区的深部、黑山矿区东侧和北侧、大庙杂岩体的东部边缘可能被中生届覆盖的区域等地段都具有很好的找矿空间,大庙矿区铁矿资源潜力巨大。

    Abstract:

    Damiao anorthosite complex, located at northern edge of the North China Craton, Chengde Hebei province, contains typical anorthosite–norite–mangerite association, and hosts abundant Fe–Ti–P oxide ores, and numerous geological, petrological and geochemical studies are available. However, ore-controlling structures analyses, tectonic stress field study and ore-forecasting model are poorly constrained, which are useful and critical to guide to further ore-prospecting. Damiao, Heishan, Maying, and Luoguozigou ore areas have been gradually discovered in the Damiao complex with middle to larger size ore-reservoir since 1928, all of which show typical magma type deposits. Field observation showed that the emplacement of the complex were controlled by EW-trending Damiao-Hongshilazi fault zones in south and Longhua-Pingquan fault zone in north, and iron ore-areas and ore-bodies within the complex were control by both NE and NW-trending faults. Nearly NS-trending fault formed and activated later than the mineralization, which cut and moved ore bodies. In the Heishan area, ore-bearing norite veins intruded into the consolidated anorthosite along conjugated joints. The occurance of joints and ore-bearing norite veins were detailed measured in the field and statistical results showed that the injection of ore-bearing norites during the metallogenic stage was mainly controlled by regional NS-trending compressional stress. SHRIMP dating of zircon, contact relations of different lithologies with ore-bodies in the complex, ore-controlling structures and ore-formation characteristics suggested that the process of magma intrusion and mineralization could be divided into three stages. Anorthosite magma most firstly intruded into pre-Cambrian gneiss at about 1.7Ga, and no mineralization took placed in this stage. During the second stage, norite magma intruded accompanied with the early stage mineralization, forming crystal-fractionation to protomagmatic deposits. And then, massive pegmatoid norite injected into anorthosite and earlier norite, forming differentiation to injection type iron bodies. The ore-forecasting model was finally established and favorable ore-prospecting areas were proposed, including the depth in the Heishan and Damiao, the northern and eastern parts of the Heishan, and the eastern edge of the complex probably covered by Mesozoic rocks, indicating that the ore-reservoir of the deposit should be very large in scale.

    参考文献
    相似文献
    引证文献
引用本文

陈正乐,陈柏林,李厚民,杜维河,李立兴,韩凤彬,王永,孙岳,吴玉,张文高.2014.河北承德大庙铁矿床地质构造特征与找矿预测[J].地质学报,88(12):2339-2350.
chen zhengle, Chen Bailin, Li Houmin, Du Weihe, Li Lixing, Han Fengbin, Wang Yong, Sun Yue, Wu Yu, ZHANG Wengao.2014. Geological characteristics of the Damiao iron deposit, North China Craton and ore-prospecting[J]. Acta Geologica Sinica,88(12):2339-2350.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2014-05-05
  • 最后修改日期:2014-09-28
  • 录用日期:2014-09-29
  • 在线发布日期: 2014-12-09
  • 出版日期: