| 全球风化淋滤型赤铁矿矿床形成条件的讨论——以几内亚西芒杜矿床（Ⅰ、Ⅱ区块）为例 |
| Received:August 08, 2024 Revised:October 27, 2024 点此下载全文 |
| 引用本文：WANGYongJi,LI LiXing,YAO ShunYi,LI LangTian,LIU JianQuan,HU JinCai,ZHANG Dan,XIA Bin.2024.Discussion on ore forming conditions of supergene high grade hematite ores from Simandou deposit (Ⅰ and Ⅱ region) in Guinea[J].Mineral Deposits,43(6):1280~1294 |
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| Author Name | Affiliation | | WANGYongJi | Central South Bureau of China Metallurgical Geology Bureau, Wuhan 430081, Hubei, China | | LI LiXing | MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | YAO ShunYi | Wuhan Huaze Science and Technology Development Co., Ltd., Wuhan 430205, Hubei, China | | LI LangTian | Central South Bureau of China Metallurgical Geology Bureau, Wuhan 430081, Hubei, China | | LIU JianQuan | Tianjin North China Geological Exploration General Institute, Tianjin 300170, China | | HU JinCai | Tianjin North China Geological Exploration General Institute, Tianjin 300170, China | | ZHANG Dan | Central South Bureau of China Metallurgical Geology Bureau, Wuhan 430081, Hubei, China | | XIA Bin | Central South Bureau of China Metallurgical Geology Bureau, Wuhan 430081, Hubei, China |
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| 基金项目:本文得到自然科学基金项目（编号：42072112）和地质调查项目（编号：DD20221695、DD20242072）联合资助 |
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| 中文摘要:条带状铁建造（BIF—Banded Iron Formation）上部发育的赤铁矿床（w(TFe) ＞ 62%）是全球最重要的铁矿资源，但对其成矿条件的认识仍然存在争议。文章以几内亚西芒杜赤铁矿矿床（Ⅰ、Ⅱ区块）为例，根据全球古板块（含BIF）漂移轨迹，并按成矿系统“五要素”（源、运、储、变、保）对全球风化淋滤型赤铁矿矿床的形成条件进行讨论。文章认为丰富的矿源层是形成赤铁矿床的基础；条带状铁建造出露地表，板块（含BIF）漂移穿过赤道和南、北回归线是必备条件；上亿年的热带环境和热带雨林生物及微生物的作用是脱硅的关键；富氧化铁矿石的后期改造提高矿石质量；赤铁矿矿体大部分得到保存能形成超大型矿床。 |
| 中文关键词:条带状铁建造 风化淋滤 赤铁矿富矿 成矿条件 西芒杜 |
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| Discussion on ore forming conditions of supergene high grade hematite ores from Simandou deposit (Ⅰ and Ⅱ region) in Guinea |
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| Abstract:Hematite deposits (w(TFe) > 62%) developed in the upper part of the banded iron formation (BIF) represent the most important iron ore resources in the world, but the ore-formation conditions remain debated. Taken the Simandou hematite deposit in Guinea as an example, and based on the drift trajectory of global ancient plates (containing BIF) and the “five elements” of mineralization system (including source, transport, storage, transformation, and preservation), this paper discussed the ore-forming conditions of the BIF-hosted high-grade hematite deposits in the world. We propose that abundant BIF layers are the basis for the formation of large-scale high-grade hematite deposits, the exposure of BIF layers to the surface and BIF-bearing plates drifting through the equator and Tropic of Cancer is a necessary condition, billions of years of tropical environment as well as tropical rainforest organisms and microorganisms is the key for desilicification, later alteration of hematite is favorable for increasing ore grade, and the preservation condition is also important for the formation of large-scale high-grade hematite deposits. |
| keywords:banded iron formation supergene process high-grade hematite ore ore-forming condition Simandou |
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