| 北山地区金矿床金的赋存状态和金矿物特征 |
| |
| 引用本文： | 陈柏林,吴淦国,叶德金,刘晓春,舒斌,杨农.北山地区金矿床金的赋存状态和金矿物特征[J].矿物学报,2000,20(3):242-249. |
| |
| 作者姓名： | 陈柏林 吴淦国 叶德金 刘晓春 舒斌 杨农 |
| |
| 作者单位： | 1. 中国地质科学院地质力学研究所北京 100081
2. 中国地质大学北京 100083 |
| |
| 基金项目： | 原地质矿产部定向研究项目(地科定96-21)部分研究成果 |
| |
| 摘 要： | 甘肃北山地区金矿床主要有岩浆热液型金矿床和与韧性剪切带有关的金矿床，矿化类型为石英脉型和蚀变岩型。金多呈独立金矿物形式出现，少放许呈分散状；金矿物以银金矿为主，次为自然金，平均成色７７２；金矿物以粒间金、裂隙金、连生金、连生金和包体金等形成嵌布于石英、黄铁矿、方铅矿及闪锌矿等主要载物较为发育。金矿物特征反映出本区金矿床的成矿物质主要来源于变质岩，华力西－印支期中酸性岩浆活动是主要的动力源。
|
| 关 键 词： | 金矿物 赋存状态 金矿床 甘肃 |
| 修稿时间： | 1999年9月1日 |
MODE OF OCCURRENCE OF GOLD AND CHARACYERISTICS OF GOLD MINERALS IN GOLD DEPOSIIS, BEISHAN AREA, GANSU |
| |
| Chen Bailin\ \ Wu Ganguo\ \ Ye Dejin\ \ Liu Xiaochun\ \ Shu Bin\ \ Yang Nong\,..MODE OF OCCURRENCE OF GOLD AND CHARACYERISTICS OF GOLD MINERALS IN GOLD DEPOSIIS, BEISHAN AREA, GANSU[J].Acta Mineralogica Sinica,2000,20(3):242-249. |
| |
| Authors: | Chen Bailin\ \ Wu Ganguo\ \ Ye Dejin\ \ Liu Xiaochun\ \ Shu Bin\ \ Yang Nong\ |
| |
| Institution: | Chen Bailin\ 1\ Wu Ganguo\ 2\ Ye Dejin\ 3\ Liu Xiaochun\ 1\ Shu Bin\ 1\ Yang Nong\ 1 1. |
| |
| Abstract: | Gold deposits in the Beishan area, Gansu Province, belong to the magmatic hydrothermal type and ductile shear zone type, while the mineralization is classified as the quartz\|vein type and the altered rocks type. The mineral association of the ore is as follows: quartz, pyrite, chalcopyrite, galena, sphalerite, arsenopyrite and tellurobismuthite. Aurum occurs mainly as independent gold mineral, rarely as mechanical mixture, solid solution, and adsorbed matter in auriferous minerals. The essential gold mineral is electrum with 72.75% Au and 25.67% Ag \1000xAu/(Au Ag)=739\]; the auxiliary one is gold with 85.01% Au and 13.06% Ag \1000xAu/(Au Ag)=862\]. Gold mineral in the major Au\|carrying minerals (quartz, pyrite, galena and sphalerite) occurs in the inter\|granular, interlocking, crevice and enclosure forms. The contents and ratios of Au/(Au Ag) of gold minerals in quartz are higher than in the others, but there is not any gold mineral in chalcopyrite. Mainly being idiomorphic\|granular and hypidiomorphic\|granular and subordinately being veinlet, the gold minerals are commonly medium\|fine grained, measuring 0.02\|0.005mm in diameter, which account for about 43.75%. Tellurium minerals are developed well in the area, such as tellurium, hessite, vilynskite, tellurobismuthite and lead\|bearing tellurobismuthite. The Au/(Au Ag) ratios of gold minerals in the area are smaller than those in other deposits in greenstone belts, but higher than those of the volcanic hydrothermal\|type gold deposits (e.g. Zhilingtou gold deposit) in the east of China. These show that the source materials of the deposits were derived mainly from metamorphic rocks and that the metallization of gold is closely related with Variscan\|Indosinian intermediate\|acid intrusive rocks. The higher contents of Te indicate that metallization is also related with the magma. Although there are differences in country rock, ore\|body attitude and mineralization/alteration type among the gold deposits in the area, similar characteristics of gold minerals predicate that they resulted from different ore\|controlling structures, different ore\|bearing structures and different tectono\|dynamic conditions in a similar mineralizing setting with the same mineral source and the same mineralizing magmatic hydrothermal condition. All this is in good consistence with the data from the study on the deposit origin. |
| |
| Keywords: | mode of occurrence golden mineral gold deposit Beishan area of Gansu |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
