共查询到20条相似文献，搜索用时 687 毫秒
1.
地质统计学在山东焦家金矿床深部含矿性预测中的应用 总被引：1，自引：0，他引：1
焦家金矿床位于胶东西北部招掖成矿带内,西,临著名的郯庐大断裂。矿体位于北北东—北东向延伸的破碎蚀变带中,受控于断裂构造,围岩蚀变以钾长石化(红化)、黄铁绢英岩化、硅化、碳酸盐化为特征。本文运用地质统计学方法,对焦家金矿床的金品位、品位厚度乘积进行了系统研究,研究结果表明：焦家金矿Ⅰ、Ⅱ、Ⅲ号矿体的变程依次减小,反映其矿化连续性依次减弱;在垂向方向上三个主要矿体的连续性强弱交替出现。 相似文献
2.
试论市场经济条件下圈定矿体的4项品位指标 总被引：10，自引：0，他引：10
阐述了在我国市场经济条件下，圈定矿体和划分不同储量／资源量的方法。提出了圈定矿体的4项品位指标的概念和确定方法。这4项品位指标依次为边界品位、边际品位、经济品位和矿床平均品位。利用前3项品位指标可以分别圈定矿体边界、次边际的资源量、边际经济的储量、经济储量。利用矿床平均品位可以衡量矿床是否具有投资价值。 相似文献
3.
4.
基于三维模型的矿床地质统计学研究,可以准确反应矿体的空间结构变化和品位的空间变化规律,在矿床评价中具有不可替代的作用。本文在已有的钻探工程数据基础上,借助三维建模软件以地质统计学思维对澳大利亚某矿床铅锌品位的空间分布特征及内在规律进行了揭示,通过对矿体铅锌品位在走向、倾向和厚度三个方向的理论变异函数的拟合,表明矿体呈明显的各向异性,在走向方向变程值较大,连续性较好,倾向方向次之。对矿体块体模型空间赋值,并进行投影分析,结果表明矿体沿走向向东矿化范围和强度均有扩大趋势,且在815800E线以东深部倾向方向铅锌品位逐渐增强,高品位矿化断续出现。因此矿区下一步勘查重点应该在矿体走向东部和815800E线以东的倾向延伸方向。 相似文献
5.
通过对西峡金红石矿床的矿体形态、厚度、品位及其变化，矿化连续性及矿体复杂程度的综合分析，进行多方案的计算对比，确定该矿床宜以露天－地下兼用的方式开采．露采是低工业品位１．６％，边界品位１．３％；露天－地下兼用的开采方式最低工业品位１．８％，边界品位１．４％。 相似文献
6.
7.
新疆鄯善小草湖硝酸盐矿床,近地表半裸露产出,具席状矿化特点。矿体形态简单,矿层平均厚度仅0.41m,NaNO_3平均品位为4.17%;矿区楔状盐溶裂隙发育,使矿体连续性遭到破坏。通过运用数理统计方法对矿体产状、矿层厚度、矿石品位、矿体连续程度等的分析,确定出合理的勘探面积、网度和储量级别。针对有异于一般矿床的某些特点,在勘探工程布置、取样及使用“含矿率”参数等方面采用了适当的处理方法。这对同类矿床的勘探工作,具一定的参考价值。 相似文献
8.
9.
喀英迪铅锌矿主要产于早石炭世阿克沙克组及其与晚奥陶世呼独克达坂组的接触带上。通过普查工作共圈定15个铅锌矿体。其中主要矿体4个,Ⅰ-4矿体处于晚奥陶世呼独克达坂组灰岩与早石炭世阿克沙克组的不整合接触面上及其两侧,工程控制总长度为523m,最大斜深100m。倾向70°～100°,倾角一般20°～50°,连续性较好。该矿体铅单工程厚0.86～5.64m,平均2.86m,厚度变化系数为70.57%;锌单工程厚0.80～5.64m,平均1.81m,厚度变化系数为93.97%,属于变化较稳定型矿体。铅单工程品位0.62%～16.47%,平均4.53%,品位变化系数114.34%;锌单工程品位0.53%～12.37%,平均3.78%,品位变化系数57.47%。属于有用组分分布较均匀型矿体。通过对矿床地质特征的研究,认为该矿床属沉积岩容矿的、层控的、构造控制非岩浆型低温热液矿床。 相似文献
10.
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