【作者】 舒广龙；

【导师】 刘继顺；

【作者基本信息】 中南大学 ， 矿产普查与勘探， 2004， 博士

【摘要】 本文以斑岩成矿理论为指导，着重研究了湖北丰山矿田的成矿地质背景、新近发现的微细浸染型（卡林型）金矿及斑岩成矿系列。在大量野外调查和前人工作成果基础上，通过室内综合研究，建立了斑岩成矿模式，总结了成矿规律，并指出了进一步找矿的方向。取得的新认识主要有： （1） 通过地质调查和资料综合分析，对矿田成矿地质背景有了新的认识。认为早三叠世末该区发生推覆造山，由推覆形成的多层次、多级别推覆构造所造成的构造薄弱面控制了燕山期岩浆一成矿作用。通过综合编图发现，丰山岩体形态并非如前人所认为的简单蘑菇状，其边缘岩脉也并非系倒灌形成。地质和地球化学研究及大地电磁测深、遥感和钻探初步验证结果表明，矿田侵入体为壳幔混源型同源岩浆产物，且具有“二层结构”。上层为受叠瓦状断层控制的岩枝、岩株，在钻孔剖面上表现为围岩与岩体呈“层状”形态，下层为由它们连接而成的受主干断裂构造控制的隐伏大岩体。发现赋矿地层中的黑色纹层状炭泥硅灰质岩石普遍褪色，残留的这种黑色岩石富含显微球状黄铁矿(δ³⁴S-7.33～-7.39‰)和有机碳等成矿有利物质。稀土元素、同位素和微量元素研究结果表明，该类岩层是为成矿提供部分金属元素（尤其是金）的矿源层。 （2） 发现并肯定两条微细浸染型金矿化带。基本查明了该类型金矿的地质和地球化学特征，总结出了找矿标志，并估测了这类金矿的找矿前景。首次详细论述了热液脉型多金属（金）矿的地质特征，并结合生产实际查明金的赋存状态。 （3） 把矿田视为一个斑岩成矿系统，通过H、O、Pb、S同位素、稀土元素、微量元素和包裹体成分等测试分析数据，研究了丰山铜矿矿床地球化学特征，并以此论证矿田成矿流体主要来源于大气降水，成矿物质既来源于上地幔或下地壳，也来源于矿源层。认为成矿流体可在岩浆提供的热能驱动下对流循环，萃取、富集成矿物质。 （4） 论述矽卡岩型、斑岩型、热液脉型和微细浸染型矿床的时空演化和成因联系，用以说明它们为斑岩成矿系列，并建立斑岩成矿模式。 （5） 根据矿田成矿规律，指出李家湾与鸡笼山之间推覆构造发育地段及鄂东—赣西北的其它一些地段具有良好找矿前景，丰山与鸡笼山之间的地段具有大型金铜矿床找矿前景。在对丰山南山找矿靶区的解剖研究中，发现两条与丰山南缘矿带相平行的金铜矿化蚀变与物化探异常带，7勘探线的验证孔已经打到富而厚的金铜工业矿体，证实了我们的研究成果。更多还原

【Abstract】 Guided by porphyry metallogenic theories, This paper emphaticlly studies the metallogenic geology background, micro-disseminated (Carlin-type) gold deposits recovered recently and porphyry metallgenic series of Fengshan orefield in Hubei. Based on the mass field on-site survey and the work of predecessors? with laboratory comprehensive study, the paper established the pophyry metallogenic model, summed up the metallogenic regulation, and pointed out the direction of further prospecting . The main new views obtained are as follows :(1) Based on geological survey and comprehensive analysis of data, new views on the metallogenic geology background were gained. At early Triassic end, nappes orogeny occurred in the area formed nappe structure. The structural planes of fracture made by nappe faults controlled intrusion-metallization of Yanshanian magma. By drawing composite map, it is discovered that the shape of Fengshan intrusive body dosent like the shape of a mushroom, which was recognized by predecessors. Geological and geochemical researches conclude that orefield instrusions are products of homologous magma most of which derived from upper mantle. Magneto-telluric, remote sensing and driling data suggest the intrusive body have "two layer constructions".The upper layer instrusions are controlled by relaxed main fracture and dimbricate fault,and the lower layer is hidden instrusion controlled by relaxed main fracture.In ore-host strata,the black carbo-naceous,argillaceous and siliceous carbonatite faded universally, the relic black rocks contain a lot of micro orbicular and micro-fine disseminated pyrites (δ 34S-7.33~-7.39%) and organic carbon wich are benificious to minerallization.The data of REE, isotope and trace elements illustrate that the strata are ore-beds that suply metallic elements (special Au) for metallization.(2) Two micro-disseminated gold metallogenic belts are discovered and affirmed. Basicly finded out the geological and geochemical characters of this type gold ore, generlized its significance for prospecting and estimated its prospective reserves. Expounded the geologial characters of hydrothermal vein-typ gold polymetal deposits for the first time, and the gold occurrence of the mine is ascertained for the mining requirment.(3) Regarding orefield as a porphyry metallogenic system, studied the geochemical characters of Fengshan copper deposit with data of H,O,Pb,S isotope , REE, trace elements and compositions of the inclusions. The results of the study indicated that the metallogenic fluid mainly derived from meteoric water, and that the ore-forming resources not olny from the upper mantle and lower crust but laso from ore-beds. The fluid of convective circulation drived by thermal energy from magma extracts, transports and releases the metallogenic resources from ore-beds.(4) Demonstrated the temporal and spatial evolution of the skarn deposit, porphyry deposit, hydrothermal vein-type deposit and micro-disseminated deposits in the orefield and genetic relations between them for explaining that they are porphyry metallogenic series and establishing pophyry metallogenic model of the orefield.(5) According to the orefield metallogenic regulation summarized, pointed out that the sectors between Lijiawan and Jilongshan and some districts else of easterm Hubei and northwestern Jiangxi are all faverable for prospecting deposits and the sector between Fengshan and Jilongshan with a prospect for exploring large-scale Au-Cu deposit. On exploring the the southern mountain of Fengshan, two zones of geophysical and geochemical anomalies were discovered, the zones with mineralized alteration rocks parallel the southern minerallize belt of Fengshan deposit. Industrial ore bodies riched in Au-Cu and thick in width has been discovered in the first drill hole on the 7th exploratory line, this verified our revewer.更多还原