【作者】 岳芳；

【导师】 胡祥昭；

【作者基本信息】 中南大学 ， 矿物学、岩石学、矿床学， 2008， 硕士

【摘要】 闽西南地区是我国东南部重要的成矿集中区,复杂多变的构造形变格局以及强烈的构造岩浆活动使区内蕴藏了铁、铜、钼等丰富的金属矿产。学堂坑钼多金属矿区位于福建省龙岩市适中镇三坑村,位于政和—大埔区域性大断裂和大洋岩体的内外接触带上,成矿条件优越,具有寻找钼多金属矿的良好前景。本文应用岩石学、岩石化学、地球化学以及矿床学等理论方法,同时通过与我国已有钼矿床的对比,对学堂坑钼多金属矿区的岩石学特征以及花岗岩与成矿之间的关系进行了系统深入的研究。研究区内的花岗岩岩体属于燕山早期第三次侵入的侵入岩,是大洋岩体的一部分,岩性主要为黑云母二长花岗岩,是高硅、富碱、贫镁铁、贫钙的超酸性岩体。通过与国内其他同类型矿床的对比,大洋岩体很有利于成矿物质集中,对形成钼矿很有利。通过研究认为,区内由于多次、频繁的构造运动,形成了一系列大的断裂。由于大洋岩体岩浆演化彻底、分异程度好,岩浆带来了大量含矿物质的富集,而岩性致密的花岗岩因为不易渗透,形成了很好的“隔挡层”,在挥发份F~-、Cl~-等的作用下,含矿热液在岩体与围岩的接触带及围岩的断裂裂隙中发育,形成了矽卡岩型钼矿床。因此,大洋岩体应该是学堂坑钼矿成矿的主要物质来源,是该钼矿体的成矿母岩。更多还原

【Abstract】 The west-south area of Fujian is an important metallogenic concentration zone in the east-south region of our country.The complex structure architecture pattern and intensive magmation contributed to the mineralization and ore-forming such as iron,copper and molybdenum mineral deposit.The Xuetangkeng molybdenum mineral deposit locates in Sankeng village,Shizhong town,Longyan city,Fujian province.As far as region is concerned,Xuetangkeng molybdenum mineral deposit sits on the contacting belt which is between Zhenhe-Dapu regional fault and the biotite granite mass.So it is superior in the ore-forming condition,and the foreground is of advantage in prospecting molybdenum poly-metal mineral deposit.Applying the multi-subject knowledge such as petrology,structure, gitology,geochemistry of trace elements and mineral deposit geochemistry and contrasting to the geological characteristics of exiting molybdenum mineral deposits,the relationship between lithology of granite and mineralization has been systematically studied.The granite mass in the district is the 3rd intrusion rock in early-Yanshanianand belongs to the Dayang granite mass.At the aspect of the lithology,it is mainly biltite monzonitic granite,and it is abundant of silicon and alkali but deficient of iron and calcium.Contrasting with the other molybdenum,this granite mass is convenient to the mineral enrichment,so the area has a good prospect.Based on the analysis,following conclusions have been induced. Firstly,because of the multi-time and frequent tectonic activities,a series faults had been formed.Secondly,because the magma of the Dayang granite mass got a thoroughly evolution and contributed to the enrichment of the metallogenic matters and the lithology of the granite is compacting, so it became a good "blocking bed".Accompany with the activities of volatile component such as F~-、Cl~-,the bearing mineral hydrothermal fluid developed on the contacting belt of rock mass and wall rock and the faults of the wallrock.As a result,a molybdenum mineral deposit of skam type was formed.Based on the analysis above,the metallogenic matters mainly originated from the Dayang granite mass and it is the matrix of the molybdenum mineral deposit.更多还原