| 魏然,姚鹏,梅燕雄,滑少军,张文棠.康滇地轴泸沽式铁矿床地质特征及成因研究[J].矿产勘查,2024,15(11):2048-2059 |
| 康滇地轴泸沽式铁矿床地质特征及成因研究 |
| Study on geological characteristics and genesis of Lugu type iron ore deposit in Xikang Yunnan axis |
| 投稿时间：2024-10-30 修订日期：2024-12-07 |
| DOI：10.20008/j.kckc.202411007 |
| 中文关键词: 泸沽式铁矿 登相营群 泸沽花岗岩 成矿物源 成矿作用 |
| 英文关键词: Lugu type iron deposit Dengxiangying Group Lugu granite mineral source mineralization |
| 基金项目:本文受中国地质调查局项目“全国海陆矿产资源图件编制更新”（DD20221696）和全国危机矿山接替资源找矿项目“四川里伍铜矿、泸沽铁矿床成矿规律总结研究”（20089952）以及地调项目矿产资源国情调查与潜力动态评价（DD20230040）联合资助。 |
|
| 摘要点击次数: 92 |
| 全文下载次数: 33 |
| 中文摘要: |
| 本文简述了康滇地轴泸沽铁矿区大顶山、铁矿山等矿床的成矿地质特征，分析了铁矿与地层、岩浆岩及构造的时空关系，对铁矿的成矿作用和成矿过程进行了论述。对泸沽铁矿的成矿物质来源进行分析，认为铁质来源于登相营群浅变质（火山）-沉积含铁建造，硅的来源既来自于登相营群浅变质（火山）-沉积含铁建造，亦可来自于晋宁期泸沽花岗岩。对岩浆演化后期热液蚀变阶段的白云母测定所得Ar-Ar坪年龄为（725.5±3.7）Ma，与泸沽花岗岩体锆石U-Pb年龄（822.4±5.4）Ma相对应，说明重熔形成的铁矿浆是重熔花岗岩熔浆熔离后形成的。结合地层与矿体的空间关系，认为登相营群浅变质（火山）-沉积岩系和泸沽花岗岩体均为泸沽富铁矿的成矿地质体。前者为其提供成矿物源，后者与富铁矿同为深（重）熔作用形成的产物，铁矿浆运移通过正断层并最终在此处沉淀成矿。 |
| 英文摘要: |
| The article briefly describes the geological characteristics of the Lugu type iron deposit， including the Dadingshan and Tiekuangshan iron deposits in Xikang Yunnan Axis， analyzes the spatial and temporal relationships between the iron deposits and the strata， igneous rocks and structures， and discusses the mineralization background， mineralization process， and mineralization mechanism. It analyzes the source of the ore-forming material in the Lugu type iron deposit and the conclusion is that the iron originates from the Dengxiangying Formation epi-metamorphic （volcanic-sedimentary） iron-bearing formation， while the silicon comes from both the Dengxiangying Formation epi-metamorphic （volcanic-sedimentary） iron-bearing formation and the Lugu granite of the Jinning Period. The zircon U-Pb dating method was used to determine the age of the Lugu granite body， which is （822.4±5.4）Ma， indicating that the iron-rich pulp formed by the remelting is the result of the melting of the granite magma. The age of the biotite determined by the K-Ar dating method for the late stage of the hydrothermal alteration of the Lugu granite is （725.5±3.7）Ma. Combining the spatial relationship between the strata and the ore bodies， it is concluded that the Dengxiangying Formation epi-metamorphic （volcanic-sedimentary） iron-bearing formation and the Lugu granite body are both the mineralizing geological bodies for the Lugu rich iron deposit. The former provides the mineralizing source， while the latter， together with the rich iron deposit， is a product of deep （re）melting and formed by the same process. The iron-rich pulp migrated through normal faults and eventually precipitated into the ore deposit at this location. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |