METALLOGENIC STRUCTCTURAL PLANE CHARACTERISTICS AND ITS PROSPECTING IMPORTANCE FOR THE MAKENG TYPE IRON DEPOSITS IN SOUTHWESTERN FUJIAN PROVINCE
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摘要: 马坑式铁矿位于闽西南晚古生代坳陷盆地内,是福建省境内最主要的矽卡岩型铁-多金属矿床。矿体主要受岩性界面及构造结构面控制,尤以硅钙面控矿作用显著。马坑式铁矿主矿体定位于林地组(C1l)石英砂岩与经畲—栖霞组(C2j—P2q)碳酸盐岩的岩性界面(硅钙面)。通过对马坑式铁矿硅钙面的基本特征进行分析,划分了五类主要的成矿结构面类型:林地组与经畲组—栖霞组、经畲组—栖霞组与文笔山组、经畲—栖霞组内部碎屑岩与灰岩、经畲组—栖霞组与花岗岩类以及推覆(滑脱)界面。研究认为马坑式铁矿主矿体受不同的物理化学岩性界面(硅钙面)控制,这种界面在构造活动及流体参与过程中容易形成扩容空间,构成成矿地球化学障,有利于成矿物质的沉淀富集。在以上认识基础上,建立了以硅钙面为主要成矿作用标志的马坑式铁矿成矿模式,认为运用硅钙面控矿理论指导闽西南地区找矿预测的具有重要的找矿指导意义。Abstract: Located in the Late Paleozoic depression of southwestern Fujian, the Makeng type iron deposits are the main skarn iron polymetallic deposits. The major ore bodies are generally controlled by lithologic boundaries and tectonic structural planes, especially the interface between silica and calcareous bed, and they are located above the quartz sandstone of the Lower Carboniferous Lindi formation(C1l)and below the carbonate rocks of the Upper Carboniferous Jingshe formation-Upper Permian Qixia formation(C2j-P2q). In order to reveal the genesis and mineralization mechanism of the Makeng type iron deposits, the Si/Ca surface ore-controlling theory was used to discuss the metallogenic structctural plane characteristics and its ore-controlling mechanism. Five types of metallogenic interfaces were divided according to their features in this research. We deemed that the main ore bodies of Makeng type iron deposits were controlled by the physical and chemical differences between these Ca/Si surfaces, and it is easy to form expansion space and geochemical barrier near the surfaces in the process of tectonic and fluidic activities. Based on the understanding above, the metallogenic model of the Makeng type iron deposits was built using the Si/Ca surface ore-controlling theory. This work is thought to be meaningful to conduct prospecting research of iron polymetallic deposits in southwestern Fujian Province.
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图 2 马坑式铁矿床地质剖面图(据文献[22])
Q—第四纪沉积物;P2w—中二叠统文笔山组;P2t—中二叠统童子岩组;P2q—中二叠统栖霞组灰岩;P1c—下二叠统船山组灰岩;C2j—上石炭统经畲组灰岩;C1l—下石炭林地组石英砂岩;Pt2-3l—中上元古界马面山群龙北溪组;γ—花岗岩;γπ—花岗斑岩;br—构造角砾岩;βμ—辉绿岩;SK—矽卡岩;FeM—磁铁矿;Zn—锌矿脉
a—马坑铁矿61线;b—洛阳铁矿南段6线;c—潘田铁矿8线;d—德化阳山铁矿S72线Figure 2. Geological sections of Makeng type iron deposits(after [22])
图 7 马坑矿区不同地层氟氯元素平均含量曲线[22]
Figure 7. Curves of average content of fluorine and chlorine elements from different strata of the Makeng ore area
表 1 闽西南地区铁矿顶底板岩性比例
Table 1. Lithologic proportion of top and bottom plates of iron deposits from southwestern Fujian Province
岩石类型 顶板 底板 灰岩、大理岩 28.19% 4.59% 石榴石透辉石矽卡岩类 54.9% 51.38% 酸性侵入岩 7.58% 11.38% 中基性岩体 3.5% 2.76% 沉积碎屑岩 5.82% 29.89% 表 2 闽西南地区相关岩石中含铁性统计一览表[44]
Table 2. Iron content of different rocks from southwestern Fujian Province
岩石名称 岩石地层单元 全铁含量/% 采样地点 分析样品数 碳质板岩 童子岩组 5.0 阳山 2 板岩 文笔山组 4.99 阳山 4 粉砂质泥岩、粉砂岩 经畲组 3.01~7.39 中甲剖面 6 粉砂岩 林地组 4.76~7.25 21 细砂岩 林地组 1.76~5.47 中甲、上园、连城等剖面 11 石英砾岩和粗砂岩 林地组 1.01~1.61 14 砂岩、粉砂岩 桃子坑组 6.75 桃子坑剖面 7 变质粉砂岩 奥陶—志留纪 3.68~6.91 中甲101孔 11 花岗岩 燕山期 1.3~2.5 区内各矿区有关花岗岩总平均数 -
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