| 张庆松,魏宇,柳维.四川省冕宁县泸沽—喜德县冕山地区铁锡矿成矿规律分析[J].地质找矿论丛,2021,36(4):395-405 |
| 四川省冕宁县泸沽—喜德县冕山地区铁锡矿成矿规律分析 |
| Analysis of metallogenic regularity of Fe, Fe-Sn and Sn deposits in Lugu(Mianning county)-Mianshan(Xide county) area of Sichuan province |
| 投稿时间：2021-07-19 |
| DOI：10.6053/j.issn.1001-1412.2021.04.001 |
| 中文关键词: 铁锡矿床 成矿规律 矽卡岩型 云英岩型 冕宁县泸沽-喜德县冕山地区 四川省 |
| 英文关键词:Fe, Sn deposits metallogenic regularity skarn type greisen type Luhu (Mianning county)-Mianshan (Xide county) area Sichuan province |
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| 中文摘要: |
| 文章简述了四川冕宁县泸沽—喜德县冕山地区猴子崖铁锡矿、铁矿山铁矿、大顶山铁锡矿、下山堡—黑林子锡矿和拉克铁矿等矿床的成矿地质特征，分析了铁锡成矿与岩浆岩、地层及构造的时空关系，对铁锡矿的成矿地质背景、成矿作用和成矿过程进行了总结。壳源泥质岩类重熔形成的A型花岗岩体为成矿提供了Sn、W等成矿元素，泸沽花岗岩和中酸性火山岩的热能和挥发组分大量逸出形成成矿热液，并使幔源基性岩墙（脉）产生强烈蚀变，释放出大量的Fe质进入成矿热液，为铁锡矿的形成提供了主要的物质组分；中-新元古界登相营群的Fe元素丰度较高，在构造-岩浆活动中部分Fe元素被热液萃取，为成矿提供出部分成矿元素；区域性NNE向断裂、岩体构造、局部性褶皱（曲）构造、沿层和切层的滑动断裂（裂隙）带均可以控制矿床（体）的产出部位、形态特征和矿化类型；本区铁锡矿床包括矽卡岩型铁锡矿和云英岩型锡矿2种类型，分别受大理岩层与变质砂岩（或千枚岩）的岩性转换界面（钙-硅质岩界面）和变质砂岩（千枚岩）岩性界面（隔水界面）的控制。该区铁锡矿床为与新元古代复合岩浆热液作用有关的矽卡岩型-云英岩型铁锡矿床，具有成矿物质多源、成矿岩体多个、控矿构造多样、矿化多型（式）的特点。 |
| 英文摘要: |
| Metallogenic and geological characteristics of Houziya Fe-Sn, Tie Kuangshan Fe, Dadingshan Fe-Sn, Xiashanbao-Heilinzi Sn and Lake Fe deposits etc. in Lugu-Mianshan area and tempo-spatial relationship of the deposits to magmatic rocks, strata and geological structure are analyzed and the metallogenic processes and geological background of the deposits summarized in this paper. A-type granitic bodies derived from remelted argillaceous rocks in the crust provide ore elements of Sn, W for the deposits. Heat energy and volatile components escaped from the Lugu granite and intermediate-acidic volcanic rocks resulted in hydrothermal fluid which strongly altered the mantle-derived basic dykes and extracted a large amount of Fe from them for formation of the deposits. The Middle Cenozoic Dengxiangying group with higher Fe abundance occurs in the area and the fluid also extracted Fe from it during structural-magmatic activities. The regionally distributed NNE faults, granite bodies, local folds, slip fault (fracture) zones along or cross beds control morphology and ore types of the deposits. The deposit includes skarn type Fe, Fe-Sn and greisen type Sn deposit which are controlled by litgologically transitonal interface of carbonaceous-siliceous rocks, i.e., marble and meta-sandstone (phyllite) and water resisting interface of marble and meta-sandstone respectively. The deposits here are skarn-greisen type ones related to complex magmatic-hydrothermal metallogenic processes characterized by multi-sources of ore mterials, multi-metallogenic granite bodies, multi-ore controlling structures and multi-ore types. |
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