Metallogenic Regularity and Exploration Targets of Rutile Deposits in the Panxi-Huidong Area, Southwest China
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摘要:
攀西会东地区是我国重要的大型金红石矿集区。通过野外地质调查、岩相学研究，系统揭示金红石矿床地质特征及成矿规律，并提出勘查方向。研究表明，（1）矿体严格受前震旦系淌塘组下段（Pt3t）变质火山－沉积岩系控制，含矿建造以绢云千枚岩、绿泥绢云千枚岩为主，原岩钙碱性火山凝灰岩提供成矿物质基础；（2）金红石赋存状态具典型变质分异特征，定向分布于云母（001）解理面；（3）矿床成因属火山沉积－区域变质叠加型；（4）提出“地球化学－地球物理”找矿工作方法，优选复式背斜转折端、片理密集带及CSAMT低阻异常区为重点靶区，指出了下一步找矿工作方向。研究成果为扬子板块西缘前寒武纪钛成矿系统研究提供新范式，对深部找矿突破具有指导意义。
Abstract:The Panxi-Huidong Area in China is a significant large-scale rutile ore cluster, whose metallogenic mechanisms and resource potential are crucial for ensuring the supply of strategic titanium resources. This study systematically reveals the geological characteristics and metallogenic patterns of rutile deposits through field geological surveys and petrographic studies, while proposing exploration strategies. Key findings include: (1) Ore bodies are strictly controlled by the metamorphic volcanic-sedimentary rocks of the lower Tiantang Formation (Pt3t) in the pre-Sinian system, with sericite phyllite and chlorite-sericite phyllite as the main ore-bearing formations, derived from calc-alkaline volcanic tuff that provided the primary material source; (2) Rutile exhibits typical metamorphic differentiation characteristics, being directionally distributed along the (001) cleavage planes of micas; (3) The genesis of the deposits is attributed to a volcanic sedimentation-regional metamorphism superimposed type; (4) A "geochemical-geophysical" prospecting methodology is proposed, prioritizing hinge zones of composite anticlines, schistosity-dense zones, and CSAMT low-resistivity anomalies as key exploration targets. This research establishes a new paradigm for studying Precambrian titanium metallogenic systems on the western margin of the Yangtze Block and provides critical guidance for breakthroughs in deep mineral exploration.
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Key words:
- metallogenic regularity /
- prospecting direction /
- rutile /
- Huidong Area
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表 1 研究区金红石矿床控矿要素
Table 1. Ore-controlling factors of rutile deposit in the study area
成矿要素 描述内容 地质环境 岩石类型 绢（白）云母片岩、千枚岩、白云石大理岩夹变中基性凝灰岩 岩石结构 粒状鳞片变晶结构、半自形—它形柱粒状结构、变余凝灰结构、云雾状结构、镶边结构、眼球纹理状结构、包含结构、显微变晶结构等 成矿时代 晋宁期-澄江期 矿床成因 火山沉积—变质型金红石矿床 矿床特征 含矿岩系特征 淌塘组下段地层中，含矿岩石组合为绢（白）云母片岩、千枚岩、白云石大理岩夹变中基性沉凝灰岩 矿物组合 主要为金红石，少量白钛矿（金红石+白钛矿2%～6%）；脉石矿物主要为绢云母、石英、白云石、方解石、绿泥石、褐铁矿、钠长石；少量黄铁矿、白云母、黑云母、炭质；偶见电气石、磷灰岩、闪锌矿、锆石、兰晶石。 结构构造 粒状鳞片变晶结构、半自形—它形柱粒状结构、变余凝灰结构、云雾状结构、镶边结构、眼球纹理状结构、包含结构、显微变晶结构等。矿石构造主要有片状构造、千枚状构造、块状构造、条纹条带状构造、显微层纹状和变余层状构造 控矿条件 淌塘组下段地层控矿 
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