共查询到20条相似文献，搜索用时 78 毫秒
1.
矿床的原生晕通常形成在矿体周围,与蚀变矿物和矿石矿物同时形成。矿床原生晕的分带规律能够提供较为准确的找矿目标。一些金属矿床的原生晕具有示踪隐伏矿体的作用,从而为探测深埋矿体提供了重要的线索。老厂大型锡多金属矿床是个旧巨型锡多金属矿床的重要组成部分,以广泛发育夕卡岩化矿化为其特征。根据其空间分布夕卡岩矿化可分为两类:内夕卡岩矿化和外夕卡岩矿化。前者发生在侵入体内蚀变带,后者主要形成于侵入体附近的蚀变碳酸盐岩中。它们在地球化学特征上有以下异同:(1)内夕卡岩和外夕卡岩矿体的轴向分带序列(从矿体的头部到尾部)分别为Ag-As-Bi-Cu-F-Pb-Sn-Zn-B→Ba-Co-Cr-Ni-Sb-V→Be-Mo-W和F-B-Ba-W→Cu-Sb-Be-Cr→Sn-Pb-Zn-Ni-Ag→Co-Mo-Bi-As。这表明异常元素的种类具有高度一致性,但轴向分带序列存在很大差异。(2)统计分析表明内夕卡岩矿化具有三种主要成矿元素组合:(a)As-B-Be-Co-Sn组合代表发育在花岗岩内蚀变带的云英岩化有关的锡石-硫化物-电气石蚀变矿化组合;(b)Mo-W代表与高温夕卡岩化相关的辉钼矿-白钨矿矿化组合;(c)Ag-Pb-Cu-Zn代表后期叠加于内蚀变带角银矿-方铅矿-闪锌矿-黄铜矿矿化组合。(3)外夕卡岩矿化也具有三种主要成矿元素组合:(a)Ag-Bi-Sn-Cu代表发育在外夕卡岩带角银矿-辉铋矿-黄锡矿(锡石)-黄铜矿中低温矿化组合;(b)As-Zn-Pb代表发育在外夕卡岩带毒砂-闪锌矿-方铅矿中温硫化物组合;(c)F-Be-W-Mo代表靠近侵入体一侧萤石-绿柱石-白钨矿-辉钼矿高温矿化组合。上述表明矿化具有多期多阶段特点。最后,在原生晕轴向分带序列的基础上,分别建立了内、外夕卡岩带深部矿体预测模型,为深部成矿预测提供强有力工具。 相似文献
2.
玻利维亚多尔各市D铜矿地处安第斯褶皱带中段,西科迪勒拉构造带东侧南端。矿体主要赋存于多尔各组二段(E3t2)地层中。通过对多尔各市D铜矿矿物分带、主元素及微量元素组合分析,采用数理统计分析方法。研究结果表明:(1)粉砂岩型矿化(Ⅰ型矿化):近矿硅化增加,矿化范围叠加石膏脉,围岩泥质(脉)含量减少,方解石化(隐晶质)发育减弱;远离矿化硅化减弱,石膏脉消失,方解石化增强,泥化增强。(2)砂砾岩型矿化(Ⅱ型矿化):近矿硅化增加,矿化范围叠加石膏脉,围岩泥质(脉)含量减少,方解石化(隐晶质)减弱;远离矿化段,硅化减弱,石膏脉消失,方解石化增强,泥化增强。(3)石英脉型矿化(Ⅲ型矿化):内带主要发育矿化、硅化,最显著的特征为发育大量矿化脉及石英脉;外带发育泥质脉及石英脉。(4)Cu—Ag元素组合为矿区重要的矿化元素组合内带,Ca—Mn元素组合为矿区近矿围岩褪色蚀变元素组合中带,U—V元素组合为矿区含矿"红层"元素组合外带。通过矿物分带、地球化学元素分析,确定找矿靶区,并在靶区探获铜矿量770.08万吨、平均品位1.77%、金属量136304t。 相似文献
3.
4.
5.
山东招远界河金矿床矿化垂向变化特征研究 总被引：1，自引：0，他引：1
界河金矿床作为胶东地区典型的蚀变岩型金矿床,目前通过坑道工程揭露已经探明其矿体垂深达800m左右。从矿区浅部向深部,其矿化呈现出一定的规律性变化:矿化类型呈现出浅部以蚀变岩型矿化为主、深部以裂隙脉型矿化为主的分带规律;矿体规模逐渐变小,矿化强度逐渐减弱,矿体产状也逐渐变缓。此外,矿物组分、矿石组构、围岩蚀变以及微量元素特征等从浅部向深部也均呈现出规律性的变化。结合区域内石英脉型和蚀变岩型金矿化的垂向分带特征,初步建立了胶东地区金矿化在垂向上的"三段式"分带模式:浅部以石英脉型矿化为主,中部以蚀变岩型矿化为主,深部则以裂隙脉型矿化为主。 相似文献
6.
《地质科技情报》1991,(2)
早川与释迦坑矿床的铜铅锌矿化作用特征,集中表现在单位矿脉的构造、矿物组合、矿化阶段以及矿脉中石英和母岩氧同位素组成等方面.早川与释迦坑的矿床中,存在着黄铜矿—黄铁矿—黝铜了—方铅矿—伴有闪锌矿的石英脉(铜铅锌石英脉)以及方铅矿—伴有闪锌矿的石英脉(铅锌石英脉.铜铅锌石英脉较铅锌石英脉更早期形成.铜铅锌石英脉的矿物组合为黄铜矿、黄铁矿、黝铜矿—砷黝铜矿、方铅矿、闪锌矿、硫砷铜矿、车轮矿、板硫锑铅矿、碲银矿、黄锡锌矿、砷等轴硫钒铜矿、Cu-Fe-Zn-Sn-S系矿物、硫碲铋铅矿、硫铜铋铅矿、石英以及磷灰石.铅锌石英脉的矿物组合为方铅矿、闪锌矿、黄铁矿、黄铜矿、黝铜矿、银金矿及石英.随着矿化作用早期向晚期过渡,闪锌矿中的FeS含量有所减低.黝铜矿—砷黝铜矿的单一颗粒中,Sb与As之间的化学组成出现明显的非均质性. 相似文献
7.
黄沙窿铜矿区热液矿床原生晕,严格受南北向与近东西向两组构造控制.与赤铁矿化、白云石化等围岩蚀变有密切关系。区内矿化蚀变与原生晕组分,有明显的垂直分带特征。其中Ⅱ矿带元素分带序列从上至下为Sb—As—Ag—Pb—Cu—Bi—Zn—(As)—Sn。据此可作为前缘与尾缘异常的评价依据。当地表矿体引起的原生异常中,包含明显的Sb、Ag异常,且Sb/Sn>0.3;蚀变以白云石化、赤铁矿化为主,矿石矿物主要为辉铜矿时,说明该矿体向深部尚有较大的延深,延深距离可用文中提到的线性方程来判断。笔者根据前缘异常评价指标,推测ZK_(13)与ZK_(24)间有盲矿存在。 相似文献
8.
矽卡岩型金属矿床的形成与构造活动是密切相关的。本文以安徽铜山矽卡岩型铜矿床为研究对象,通过对岩体侵位特征、矽卡岩矿化分带特征、和矿物组合变化规律的研究,系统分析了断裂、褶皱、不整合、接触带等构造活动对本区矽卡岩型铜矿床的成矿控矿意义以及对于矽卡岩矿化的影响。研究表明,构造运动贯穿岩浆上侵、就位、岩浆热液流体活动、接触交代、成矿等整个地质过程;岩浆侵位和矿体的赋存主要受不整合面控制;垂向上矽卡岩矿化分带不同,浅部矿体主要产于石炭-二叠系(C-P)灰岩与燕山期花岗闪长岩体形成的矽卡岩接触带上,而深部矿体则是由于岩浆热液流体的灌入式侵位,发生接触交代、矽卡岩化而成矿的;断裂-接触带共同控矿导致反向矽卡岩矿化分带。 相似文献
9.
玲珑金矿田矿物组合与地球化学分带及矿体定位预测意义 总被引：9，自引：0，他引：9
详细讨论了玲珑金矿田矿物组合和元素的空间分带，二之间的一致性说明矿物组合的空间分带是宏观的元素地球分带，且具有远程有序和短程无序的特点。同时在矿田水平方向上，由于SE→NW金属矿物的种类和含量呈增加的趋势，由少硫化物蚀变岩型向多金属硫化物石英脉型变化。由于不同矿物组合的矿脉赋矿标高具有较大的差异，这为矿体的定位预测提供了矿物学依据；另外矿物组合的垂向分带，对判定矿体的剥蚀深度和延深也具有重要的参考价值。 相似文献
10.
甘孜丘洛成矿带金矿的流体包裹体研究 总被引：2，自引：0，他引：2
本文研究金矿石矿物中流体包裹体的特征,成矿流体的性质(成分、盐度和密度)以及矿石形成时的温度和压力,结合金矿化的元素和矿物组合,确定本区金矿化的垂直分带规律。 相似文献
11.
Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
12.
Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
13.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
14.
15.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
16.
正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
17.
正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
18.
正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
19.
正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
20.
正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献