共查询到18条相似文献,搜索用时 0 毫秒
1.
2.
3.
丁家林-太阳坪金矿带与丁家林-太阳坪脆-韧性剪切带同位分布、同能源作用、同步生成,是脆-韧性剪切变形形成的石英脉型金矿,总体走向NE,主要由丁家林和太阳坪2个金矿床组成,分石英单脉、单脉密集带、复脉带3个亚型。丁家林以含Au石英复脉为主,太阳坪以含Au石英单脉为主;成矿物质来源于富含Si质的志留系黄坪组,成矿流体主要是构造水;内生成矿作用分脆.韧性剪切变形-构造分异热液期和韧-脆性剪切变形-构造分异热液期,与2期脆-韧性剪切变形相对应,第2期为主成矿期。其成矿机理是脆-韧性剪切变形动力成岩成矿。 相似文献
4.
5.
通过对德兴铜矿南山矿区矿石中伴生金的赋存状态及工艺性质的研究表明:矿石中的金主要以自然金、银金矿的形式存在;金矿物的粒度主要分布在0.016~0.128mm之间,其发布形式以包体金、粒间金为主;黄铜矿和黄铁矿是金的主要载体矿物。矿石破碎到入造粒度时,有45%以上的金矿物以裸露金的形式产出。矿区中不同地段、不同类型矿石中的金在赋存状态及工艺性质方面存在明显的差异。 相似文献
6.
7.
金窝子金矿属于岩浆热液型金矿床,金矿化类型有石英脉型和蚀变糜棱岩型.金多呈独立金矿物形式出现,少许呈分散状,以银金矿为主,次为自然金,平均成色782.金矿物以粒间金、裂隙金、连生金和包体金等形式嵌布于黄铁矿、石英、方铅矿及闪锌矿等主要载金矿物中,且黄铁矿、石英较金属硫化物中占优势,黄铜矿中未见金矿物.金矿物形态各样,粒度以中细粒为主.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,成矿作用与华力西、燕山期中酸性侵入岩有关.这与地质地球化学研究所获得的矿床成因认识相一致. 相似文献
8.
9.
10.
丁家林-太阳坪脆-韧性剪切带处于扬子地台、秦岭及松潘-甘孜褶皱带的结合部,出露长度大于10 km,走向40~50°,以密集的褶曲带、劈理带、石英脉带单独或组合出现为标志.主要经历了2期变形,第1期脆-韧性剪切变形分2个阶段.S1阶段茂县群地体发生低级变质并形成千枚理S1,分异石英脉q1;S2阶段分异q2并发生金矿化,形成S2.第2期韧-脆性剪切变形发育韧-脆性断层S3,分异q3,并发育擦痕和阶步及强烈金矿化.晚期韧-脆性剪切作用叠加在早期脆-韧性剪切变形之上.丁家林-太阳坪金矿带的2期内生成矿作用与变形作用同步进行,其控、容矿构造为脆-韧性剪切变形组构. 相似文献
11.
12.
甘肃阳山金矿是迄今为止中国发现的最大金矿。已发现的6个矿段均赋存于泥盆系中,矿石中金属矿物主要为黄铁矿和毒砂。黄铁矿有3种类型:微细粒浸染状、半自形颗粒集合体、自形单晶大颗粒;主要分布在千枚岩、花岗闪长岩、石英脉里,具有多期次多类型的特点。根据黄铁矿的特征,金矿化与石英脉体中细粒浸染状的一期黄铁矿有关。黄铁矿为重要的载金矿物之一,自然金(Au)主要以微细粒的形式赋存于黄铁矿晶体的裂隙内以及晶体与晶体的空隙间。黄铁矿赋存状态和分布特征的研究,对矿区进一步找矿具有指导意义。 相似文献
13.
黔西南地区是中国西南低温成矿域中卡林型金矿最重要的矿化集中区,由于该地区金的粒径极小,难以构成自然重砂异常,故不能直接运用自然金矿物来指示寻找黔西南的卡林型金矿。在贵州省矿产资源潜力评价项目的工作过程中,对黔西南地区的自然重砂矿物特征进行了较为系统的研究,发现采用细粒黄铁矿(载金矿物)、砷矿物(伴生矿物)、锑矿物和汞矿物的自然重砂组(综)合异常对寻找黔西南地区的卡林型金矿具有一定的指导作用和找矿意义。 相似文献
14.
The deposit under study is a hydrothermal filling-metasomatic vein type lead-zinc-silver deposit, in whichgold and silver can be recovered as by-products. These metals mainly occur as microgranular native gold,electrum, stephanite, acanthite, pyraragyrite, freibergite, and native silver. Gold minerals tend to be associatedwith galenobismutite, native bismuth and unnamed Bi_2Te. They are either enclosed in pyrite, marmatite,iron-bearing sphalerite and galens or fill the microfissures of these minerals. Silver minerals usually occur incleavages or fissures of galena, marmatite and pyrite, but are not associated with gold and bismuth minerals.Gold and silver mineralizations occurred later than lead and zinc, while the silver mineralization was precededby that of gold. 相似文献
15.
The Jinjiazhuang gold deposit occurs in the Zhangjiakou gold field,Northwest Hebei.The ore bodies are mostly hosted in Xiaozhangjiakou ultrabasic rocks dominated by diopsidite.Electron microprobe analyses indicate that the deposit is characterized by the enrichment of some platinum group elements in principal metallic minerals such as chalcopyrite,galena,sphalerite and pyrite,and the presence of millerite,Stable isotope studies show that carbon,sulfur and most of the metallogenic elements were probably derived largely from the host Xiaozhangjiakou ultrabasic rocks and that it is possible that the ore-forming fluid was predominted by meteoric water. 相似文献
16.
系统的矿相学研究表明,太阳山金矿矿石矿物主要为黄铁矿、磁黄铁矿、含银自然金、闪锌矿、黄铜矿;矿床围岩蚀变种类较多,主要有硅化、绢云母化、钾长石化、石墨化。矿石结构包括自形—半自形粒状结构、假象结构、压碎结构、包含结构、错断结构等,矿石构造包括浸染状、微脉浸染状、脉状、网脉状构造。金主要以包裹金、粒间金、裂隙金、赋存于石英、黄铁矿、磁黄铁矿中。矿区内常见的是碎裂岩和糜棱岩化岩石,很少见到糜棱岩,不存在超糜棱岩、构不成糜棱岩系列。本矿床地质特征与典型的破碎带蚀变岩型金矿山东焦家金矿极为相似。因此,太阳山金矿属于典型的破碎带蚀变岩型金矿。 相似文献
17.
桂西那弱银金矿床矿物组合特征及银和金的赋存状态研究 总被引:2,自引:1,他引:1
广西天峨那弱银金矿床以银矿为主,共/伴生金及铅、锌、锑等金属,矿物组合在右江盆地内为首次发现。矿体受那弱背斜及其轴向断层控制,赋矿层位为中三叠统百逢组含钙质浊积岩系。矿石矿物以硫锑铅矿、铁闪锌矿、黄铁矿、毒砂和方铅矿为主;脉石矿物主要有石英、方解石、绢云母等。主要矿石矿物由早到晚的生成顺序为:毒砂→黄铁矿→铁闪锌矿→硫锑铅矿→方铅矿。单矿物化学分析显示硫锑铅矿含Ag最高,其次为闪锌矿;黄铁矿含Au相对较高。EPMA测试结果表明Ag于方铅矿中含量最高,其次为硫锑铅矿;主要矿石矿物中毒砂含Au相对较高,其余矿物中Au含量均偏低。因矿石中的铅矿物主要为硫锑铅矿,可以认为那弱银金矿床的Ag主要赋存于硫锑铅矿中,Au主要赋存于毒砂与黄铁矿中,二者均以显微-次显微状态赋存于载体矿物中。根据矿物组合及其相互交代、切割关系等特征,将矿床划分为2个成矿期共4个成矿阶段。其中,第一成矿期为金的成矿期,矿物组合为黄铁矿和毒砂,由于后期成矿作用的叠加,仅保留一个成矿阶段;第二成矿期为银铅锌成矿期,矿物组合为方铅矿-闪锌矿-硫锑铅矿;包含第二至第四共3个完整的成矿阶段。该矿床Ag、Au共生是不同期次成矿作用叠加的结果。 相似文献
18.
G.N. PHILLIPS 《Journal of Metamorphic Geology》1987,5(3):307-322
Abstract Pelitic assemblages from all major Witwatersrand gold fields record metamorphic conditions of the greenschist facies, with minimal regional grade changes over at least 200 km strike length. Diagnostic metamorphic assemblages are less common in the volumetrically dominant quartzites, the actively-exploited auriferous conglomerates and some of the regionally persistent metapelitic horizons. Bulk rock composition has been a major control on assemblage development.
Key metapelitic assemblages include pyrophyllite, chloritoid, chlorite and muscovite in each gold field, with less common metamorphic biotite. Accessory minerals are pyrite, tourmaline, rutile and zircon. The abundance of chloritoid and pyrophyllite in thin shaly units, together with their minor, but widespread, distribution in quartzites and conglomerates, indicate that metamorphic temperatures reached 350°C ± 50°C in all the gold fields. Pressures are less-well constrained, 1–2 kbar being inferred. Outside the gold fields, higher grades are indicated by andalusite and kyanite near granitoid domes and later intrusions.
The temperatures during peak metamorphism and the abundance of pyrite provide ideal conditions to (re)mobilize gold and may explain its secondary textural features. 相似文献
Key metapelitic assemblages include pyrophyllite, chloritoid, chlorite and muscovite in each gold field, with less common metamorphic biotite. Accessory minerals are pyrite, tourmaline, rutile and zircon. The abundance of chloritoid and pyrophyllite in thin shaly units, together with their minor, but widespread, distribution in quartzites and conglomerates, indicate that metamorphic temperatures reached 350°C ± 50°C in all the gold fields. Pressures are less-well constrained, 1–2 kbar being inferred. Outside the gold fields, higher grades are indicated by andalusite and kyanite near granitoid domes and later intrusions.
The temperatures during peak metamorphism and the abundance of pyrite provide ideal conditions to (re)mobilize gold and may explain its secondary textural features. 相似文献