鄂东南地区鸡笼山矽卡岩金矿床的矽卡岩矿物学特征及其意义  

Geological and skarn mineral characteristics of the Jilongshan skarn Au deposit in southeastern Hubei Province

作　　者：王建[1] 谢桂青[2] 余长发[3] 朱乔乔[2] 李伟[2] 杨庆雨[4] 

机构地区：[1]河北省地矿局探矿技术研究院,河北燕郊065200 [2]中国地质科学院矿产资源研究所,北京100037 [3]核工业北京地质研究院遥感信息与图像分析技术国家级重点实验室,北京100029 [4]中国黄金集团鸡笼山金矿,湖北阳新435232

出　　处：《岩石矿物学杂志》2014年第1期149-162,共14页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金(41372090);中央级公益性科研院所基本科研业务费资助项目(K1203);国土资源部公益性行业课题(201311136;200911007-18)

摘　　要：鸡笼山金矿是长江中下游鄂东南地区典型的矽卡岩金矿床,其矽卡岩矿物学特征研究较少。围岩为三叠纪大冶组灰岩和白云质灰岩,决定了该矿床发育丰富的矽卡岩矿物组合,主要包括石榴石、透辉石、硅灰石、绿帘石、金云母等。本文详细研究了不同阶段矽卡岩的矿物学特征,并对其进行了电子探针分析(EMPA)。结果表明石榴石属于钙铝-钙铁系列,辉石为透辉石,以钙铁榴石-透辉石共生的富金矽卡岩组合是在较高氧逸度和较低酸度条件下形成的,具有铜金矿的成矿专属性。伴随着流体的演化,矽卡岩与矿体在时空和成因上都具有密切的联系。结合矿区内发育有斑岩型矿体,暗示鸡笼山金矿床可能具有统一的斑岩-矽卡岩型成矿系统,深部具有很大的找矿潜力。The Jilongshan Au deposit is a typical skarn deposit in southeastern Hubei Province, but its skarn mineralogy research is insufficient. The Jilongshan skarn Au deposit is exposed within the dolomitic limestone of Triassic Daye Formation and the Yanshanian granodiorite porphyry. The metal minerals mainly include natural gold, chalcopyrite, pyrite, molybdenite, bornite, sphalerite, galena, orpiment, realgar, and magnetite, where- as the skarn minerals are mainly garnet, diopside, epidote, wollastonite and phlogopite. The authors studied in detail the skarn mineralogical characteristics of different stages and conducted the electron microprobe analysis （EMPA）. The results show that the garnet belongs to the calcium And-Gro series, the pyroxene is diopside, and the calcium-iron garnet-diopside gold-rich skarn combination was formed under the condition of high oxygen fugacity and relatively low acidity, with copper, gold metallogenic specialization. Along with the fluid evolu-tion, ore is asmciated with skarn in space, time and origin. In combination with the development of the por- phyry ore body, the authors hold that the Jilongshan gold deposit may have a unified porphyry-skarn mineraliza- tion system, and there exists great prospecting potential in the depth.

关 键 词：矽卡岩 矿物学 鸡笼山金矿 石榴石环带 

分 类 号：P588.312[天文地球—岩石学]