共查询到20条相似文献，搜索用时 93 毫秒
1.
丝光坪锡矿与次火山岩有关.在相对开放的钙硅酸盐环境下,形成高—中温锡石—硫化物型及中低温锡石—蛋白石型复合叠加锡矿床.文中并提出了找矿标志和找矿前景. 相似文献
2.
溆浦砂锡矿床床赋存在第四系冲积层中、锡石主要富集在度部砂砾石层。矿体呈层状，平均厚０．９２－１．６６ｍ，锡石平均品位６３２－１２２９ｇ／ｍ＾３。伴生锆石、独居石。本砂锡矿床与白马山风岗岩风化壳密切有关。矿床成因属第四系全新统冲积－堆积型细谷砂矿。 相似文献
3.
腾冲-梁河地区锡矿床是富亲石元素地壳在板块会聚碰撞作用下与再生花岗岩浆活动有关的地球化学旋回中形成的。成矿期前的富集,发生于花岗岩上升侵位、分异演化过程中。由于早期硅酸盐结晶不相容,锡及相关元素逐渐向花岗岩演化序列晚阶段聚集,最终富集于残浆中。残浆在高蒸气压驱动下,向岩基顶部或近侧围岩压力释放带侵位,发生减压沸腾。含矿气-液流体与硅酸盐分离,在非平衡结晶分异条件下,锡及相关元素进入流体相,形成岩浆期后成矿流体。岩浆期后含矿气-液锡的沉淀富集机理决定于成矿流体活动的物理化学场性质。构造封闭岩体内,矿石沉淀富集作用主要由对同源母岩早期晶出的矿物碱交代作用和流体温度压力改变引起的热化学参数变化所形成,产出含锡(钨)-稀有金属变花岗岩型和内云英岩型矿床。构造开放岩体外.成矿流体迁移到长英质围岩断裂-裂隙带中,矿石沉淀富集受减压沸腾和气-液、酸-碱分离作用的制约,并有异源组分加入,产出锡石外云英岩型、富硫化物锡石-石英型矿床。富碳酸盐沉积围岩的物理化学场是以与异源物质交代平衡为主要沉淀富集机理。除接触交代矽卡岩中有部分钙硅酸盐含锡外,随成矿流体与碳酸盐平衡交代进程中流体物理化学条件下的变化,可发生一系列多阶段矿物共生组合,主要有:云英岩化矽卡岩型,含锡硼镁铁矿磁铁矿型,锡石-多金属硫化物型,含锡硫盐-方解石型。在梁河丝光坪尚产出一种以高、低温矿物共生为特点的锡石-木锡石-蛋白石绢英岩型浅成高温热液锡矿床。 相似文献
4.
溆浦砂锡矿床赋存在第四系冲积层中，锡石主要富集在底部砂砾石层。矿体呈层状，平均厚０．９２－１．６６ｍ，锡石平均品位６３２～１２２９ｇ／ｍ３。伴生锆石、独居石。本砂锡矿床与白马山花岗岩风化壳密切有关，矿床成因属第四系全新统冲积─堆积型细谷砂矿。 相似文献
5.
来利山锡矿床是滇西锡矿带西亚带的一种主要的矿床类型。本文根据该矿床的矿体产状、矿石成分、矿石矿物微量元素、成矿溶液成分等方面所反映出锡矿化与黄铁矿化间的密切关系,认为该矿床虽有两种类型—多金属硫化物云英岩型和锡石-石英黄铁矿型,前者见于已有资料和文献,而主体部分则应属于后者,即岩浆期后热液成因的锡石-硫化物型大类的锡石-石英黄铁矿亚型。 相似文献
6.
文章在介绍贵州梵净山标水岩锡钨矿床地质特征的基础上,论述了锡钨矿的赋存与富集是受白云母花岗岩、辉绿岩、构造和围岩蚀变的多重控制。认为成矿元素锡钨铜来源于下伏白云母花岗岩,将矿床工业类型列为含锡石、白钨矿电英岩脉型-云英岩脉型矿床;鉴于矿石内既有白云母、黄玉等气成标型矿物,又有电气石、锡石、黑钨矿等高温热液标型矿物,因此将矿床成因类型划属岩浆期后气成-高温热液型锡钨矿床。标水岩锡钨矿床与湖南、云南等锡钨矿床类比,成矿物质均来自花岗岩,控矿因素大同小异,但是形成时期却不相同,前者形成于武陵期,在国内实属少见,后者大都形成于燕山期,两者各具特色。 相似文献
7.
运用现代分析研究法第一次阐明了顿聂茨克和司雷姆别特矿床含矿带内稀有元素和金的聚集水平,仅发育在花岗岩和沉积－变质岩内含矿体的重要特征是金,锑,铪,钽的富集水平,钽和钪在两个矿床的锡石中高度富集,顿颞茨克矿床的含矿带划分出轻稀土而言的重稀土元素更大的富集,介绍在花岗岩内的沉积－变质岩内的含矿带分别进行的评价,指出了沙雷克组沉积的高的区域含矿性。 相似文献
8.
论宁镇地区层断热液型铅锌矿床 总被引：1，自引：0，他引：1
系统研究了宁镇地区栖霞山，大凹山，老人峰等铅锌矿床，该类矿床经历了成矿物质的初步富集期，构造改造富集期及热液叠加矿床富集成型期三个时期。因而、称为层断热液型矿床。 相似文献
9.
文章研究了我国一些铁锰矿床、铜矿床及铅锌硫化物矿床矿石及矿物中铟的含量变化特点 ,发现In在不同类型的铅、锌、铜、铁、锰等矿床中并不大量富集 ,在这些矿床中矿石平均wIn大都低于 10× 10 -6;在锡石硫化物矿床和富含锡的铅锌多金属矿床中 ,矿石中wIn平均可达 80× 10 -6以上 ,这类矿床中铟的工业储量可达数百吨甚至数千吨 ,80 %以上的铟都富集在闪锌矿中。研究结果表明 ,铟的富集成矿具有矿床类型和矿物专属性 ,这种专属性对铟资源的寻找与利用具有重要意义 相似文献
10.
四川岔河锡矿地质地球化学特征及成因分析 总被引：1，自引：0，他引：1
岔河锡矿产于晋宁期摩挲营花岗岩与前震旦系会理群天宝山组大理岩及其顶板变辉绿岩接触带中，属岩浆气成－高中温热液成因的矽卡岩型锡石硫化物矿床，地球化学特征表明，是成矿物质来源于地层和花岗岩的最古老锡矿床之一，文章介绍了矿床的地质地球化学特征，讨论了矿床的成因模式。 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.
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
15.
正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
16.
正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
20.
正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献