| 方维萱,李天成,郭玉乾,李建旭,王磊.电气石隐爆角砾岩的蚀变构造岩相序列、形成机制和金属成矿[J].矿产勘查,2025,16(8):1791-1824 |
| 电气石隐爆角砾岩的蚀变构造岩相序列、形成机制和金属成矿 |
| Altered tectonic lithofacies sequence of tourmaline cryptoexplosive breccia and their formation mechanism and metal mineralization |
| 投稿时间：2025-05-19 |
| DOI：10.20008/j.kckc.202508001 |
| 中文关键词: 电气石隐爆角砾岩 解剖建相 构造岩相模型 形成机制 超临界流体 |
| 英文关键词: tourmaline cryptoexplosive breecia anatomical facies fusion modeling formation mechanism su-percritical fluid phase |
| 基金项目:本文受国土资源公益性行业科研专项项目(201511016-1)、国家科技支撑项目(2006BAB01B09)、科技部转制科研院所专项资金项目(2008EG115074、2011EG115022)、云南省企业基础研究应用基础研究联合专项(202101BC070001-015)联合资助。 |
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| 中文摘要: |
| 电气石隐爆角砾岩筒是钨锡多金属矿床、锡石-硫化物矿床、锑金矿床和 IOCG矿床的成矿-储矿构造岩相，具有重要矿产勘查意义。在以往构造岩相学解析建相和实验填图基础上，将富电气石岩浆-热液体系相序结构划分为 7种分型结构模型:①岩浆高温流体期与多孔状电英岩相系(M型)→②电气石岩浆隐爆期与电气石岩浆隐爆角砾岩相系(Ybr型)→③气成高温热液隐爆期与电英质热流体隐爆角砾岩相系(GTbr型)→④富电气石高温热液期与赤铁矿-电气石-高级泥化相(HTm)→⑤电气石中低温热液期与赤铁矿-电气石-中级泥化相(MTbr)→⑥少电气石低温热液期与针铁矿-黄钾铁矾-电气石-中级泥化相(脉)(LTm)→⑦含B异常青磐岩化相。它们作为构造岩相学独立填图单元，主要受侵入岩体(岩滴、岩凹、岩突、岩羽、岩株，岩枝、岩墙、岩脉)和穹顶构造控制。在热流体侵位机制上，似层状和平缓状电气石岩浆隐爆角砾岩筒，以热流体侧向隐爆作用为主；近直立电气石岩浆隐爆角砾岩筒为热流体垂向隐爆作用为主。浆-气-液-固四相隐爆作用和五相多重耦合结构模型共有 4种分型结构模型和形成机制，分别是超临界流体相与熔浆-固体相变分离作用、超临界流体与侵入岩体耦合结构、超临界流体与蚀变构造岩相耦合结构、超临界流体与断裂带的耦合协同结构。提出了电气石岩-电气石隐爆角砾岩的划分新方案，为多源信息融合建模、深部探测和找矿预测提供了理论依据。 |
| 英文摘要: |
| Tectonic lithofacies of tourmaline magmatic cryptoexplosive breccia are the tectonic facies of ore-forming-hosting for W-Sn-polymetallic, cassiterite-sulpide, Sb-Au, and IOCG-type deposits with very importantmineral exploration significance. Base on the previous anatomical facies and experimental mapping of tectonic litho-facies, lithofacies sequence patterns of tourmaline-rich magmatic hydrothermal fluid system may be classified into7 types of parting structureal models, respectively, ① phase of magmatic high-temperature fluid and porous tour-malite(M-type)→② phase of tourmaline magmatic cryptoexplosive breccia and lithofacies series of tourmalinemagmatic cryptoexplosive breccia(Ybr type)→③ phase of pneumatolytic high-temperature fluid and thermal-fluid cryptoexplosive tourmalite breccia(GTbr type)→④ phase of tourmaline-rich high-temperature fluid and hematite-tourmaline-advanced argillation facies(HTm)→⑤ phase of tourmaline-rich middle to low-temperature fluid and hematite-tourmaline middle argillation facies(MTbr)→⑥ phase of tourmaline-poor low-temperature fluid and goethite-jarosite-tourmaline middle argillation facies(LTm)→⑦ B anomaly-bearing proplitic facies. They are in-dependent mapping unit, which are controlled by plutons such as droplet, cove, convex-plume, stock (apophysis,dyke), and dome-like structure. Stratiform-like or gentle pipes of tourmaline magmatic cryptoexplosive breccia maybe formed by lateral cryptoexplosive mechanism of thermal-fluid, however, suberect pipes of tourmaline magmaticcryptoexplosive breccia may be formed by vertical cryptoexplosive mechanism of thermal-fluid. Four facies-mixingcryptoexplosion of magma-gaseous phase-liquid phase-solid phase and five facies multiple coupling structure pat-tern are of four parting models and formation mechanism, correspondingly, supercritical fluid phase and phase tran-sition separation of the melt-soild phases, coupling model of supercritical fluid phase and plutons, coupling modelof supercritical fluid phase and alatered tectonic lithofacies, and coupling model of supercritical fluid phase andfaults. New classification scheme of hyalotourmalite-tourmaline cryptoexplosive breccia have been proposled,which provides theoretical basis for multi-source information-fusion modeling in order to innovate ore exploration. |
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