共查询到20条相似文献，搜索用时 62 毫秒
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查明蚀变和硫化物分带特征是建立斑岩-浅成低温铜金成矿系统的矿床模型与找矿预测的关键。?ukaru Peki铜金矿床是特提斯西段塞尔维亚Timok矿集区近几年新发现的超大型斑岩-浅成低温热液型铜金矿床(上部矿带资源量铜154万吨@2.45%,金86吨@1.37 g/t;下部矿带资源量铜1428万吨@0.83%,金295吨@0.17 g/t),矿体主要产于晚白垩世安山岩中。目前关于该矿床热液蚀变与矿化分带特征及其找矿方向的研究程度相对较低,本文根据钻孔编录信息,利用短波红外(SWIR)光谱技术、光学显微镜和电子探针分析技术,对典型剖面钻孔中的岩矿石样品开展研究,厘定了?ukaru Peki铜金矿床的热液蚀变和金属硫化物分带特征。研究发现该矿床具有垂向分带特征:下部斑岩铜金矿体、中部斑岩-浅成低温过渡铜金矿体和上部高硫型浅成低温热液铜金矿体。矿区热液蚀变分带特征明显,其中斑岩铜金矿体以岩体为中心,由内向外可划分为钾硅酸盐化带、青磐岩化带、绿泥石-白云母带和石英-白云母带,绿泥石-白云母带中的白云母SWIRAl-OH 2200nm吸收峰波长高于石英-白云母带;斑岩向浅成低温过渡铜金矿体发育硬水... 相似文献
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极限资源量模型与应用 总被引：1，自引：0，他引：1
矿床金属储量最大容量(即极限资源量)是确定矿床是否还具有找矿潜力的重要参考数据.以矿床中多个矿体资源量统计分形模型为基础,并假定矿体储量连续变化,建立了极限金属资源量(T)预测模型,其与矿体极限数(C)基本呈线性变化;与矿体储量规模分布分维值(D)呈显著非线性变化.利用极限资源量模型,分析了胶东蚀变岩型大尹格庄金矿床的极限金属储量;考虑到大型矿体存在深部延伸,储量仍在不断增加,同时小型矿体统计不全,以中型矿体的金属储量为主要参考,建立了统计分形模型,并估算其极限金属储量为1.35×105 kg,说明大尹格庄金矿床深、边部还存在较大的找矿潜力. 相似文献
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水银洞超大型金矿位于国家级南盘江-右江成矿区带北部,探明金资源量超过290 t,矿体埋深150 1 400 m,为隐伏金矿床。根据水银洞金矿中矿段成矿模式,开展东部大尺度找矿预测,实施深部钻探验证,实现贵州省金矿二度空间找矿重大突破,是理论指导找矿的典范。主要矿体呈层状、似层状及透镜状赋存于茅口组与龙潭组之间的构造蚀变体(SBT)和龙潭组生物碎屑灰岩中,矿床受构造控制明显,灰家堡背斜为主要控矿构造。背斜轴部平缓构造简单地段,矿体只产于SBT中;背斜轴线起伏、倾伏角变化、轴线转向突出、轴面倾斜、隐伏断裂发育等地段,在SBT、P3l、P3c、P3d、T1y1中均有矿体产出,层控矿体主要产出P3l中部,同时有断裂型矿体产出;特别是深部不协调过渡转折地段是金矿体集中产出部位。 相似文献
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《四川地质学报》2022,(2):223-227
满丈岗金矿是青海省近几年新发现的又一中型金矿床,累计圈定了金矿体30条(M1M30),其中工业矿体18条、低品位矿体12条。该矿床以石英脉型、蚀变凝灰岩型为主,局部见破碎蚀变岩型。其中石英脉型品位普遍较高,蚀变凝灰岩型次之,破碎蚀变岩型略低。矿体一般长度在275M30),其中工业矿体18条、低品位矿体12条。该矿床以石英脉型、蚀变凝灰岩型为主,局部见破碎蚀变岩型。其中石英脉型品位普遍较高,蚀变凝灰岩型次之,破碎蚀变岩型略低。矿体一般长度在275530m,厚度2.2530m,厚度2.24.02m,平均品位Au 3.314.02m,平均品位Au 3.315.83g/t,估算金资源量15.68吨。该文通过对矿床区域及矿区地质特征、矿体特征、围岩蚀变的分析,对矿床控矿因素、成因、成矿模式等进行了讨论,认为该矿床为中低温热液型金矿床。 相似文献
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特提斯成矿域发育多个世界级斑岩-浅成低温铜金矿床,Apuseni-Banat-Timok-Srednogorie(ABTS)斑岩-矽卡岩-浅成低温铜金成矿带位于特提斯成矿域西段。Timok矿集区位于ABTS成矿带中部,区内矿床成矿峰期主要集中在晚白垩世。Zlatno Brdo(以下简称ZB)金矿床是Timok矿集区近年新发现的金矿床(金资源量约30 t,平均品位1.11 g/t)。该矿床矿体受断裂控制,呈脉状产于晚白垩世斜长角闪安山岩中,其矿床类型和找矿潜力目前仍不清楚。本文对热液蚀变矿物和硫化物进行电子探针分析,发现ZB金矿床发育中硫化态的硫化物组合(黄铜矿+黝铜矿)、与金矿化相关的低铁闪锌矿(FeS摩尔比平均为5.8%, n=11)和富Mn碳酸盐(MnO百分含量平均为2.68%, n=46),以及矿石中含与热液重晶石共生的金碲化物。利用探矿者(MinESoft)三维建模软件,分别对蚀变带和矿体进行建模工作,结合区域地质特征,本文认为ZB金矿床为Timok矿集区首例中硫化型浅成低温热液金矿床,且该矿床北西方向具有较大的找矿潜力,热液重晶石可作为找矿标志之一。此外,同属于特提斯成矿域的... 相似文献
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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
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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
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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
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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
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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
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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
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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
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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
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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