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本文在野外地质勘查及系统分析前人工作、资料的基础上,对吉林敦化意气松南山橄榄石宝石矿成矿地质背景、控矿因素等进行了归纳总结。对宝石级橄榄石品级的划分方法进行了探讨。 相似文献
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本文在野外地质勘查及系统分析前人工作资料的基础上,对吉林省橄榄石宝石矿床区域分布及勘查开发现状进行归纳总结。吉林省橄榄石宝石矿主要分布在吉林省东部,已发现的橄榄石宝石矿床均赋存于新生界新近系上新统船底山组玄武岩中。严格受敦化-密山岩石圈断裂及其次级断裂控制。在找矿方向上应扩大已有矿区勘查范围,加大勘查力度及对省内船底山组玄武岩分布地区做重点勘查工作部署,力求在橄榄石宝石矿找矿方面取得更大的突破。同时对橄榄石宝石矿业发展远景进行探讨。 相似文献
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对河北大麻坪宝石级橄榄石物理化学及宝石学特征进行研究后,初步提出矿床成因模式,对于相似地区的碱性玄武岩地区的橄榄石宝石矿床的勘探有指导意义。 相似文献
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90年代以来,我国宝石学进入了一个新的发展阶段。在宝石资源与宝石矿物、宝石鉴定、人工合成宝石和宝石优化处理技术等各方面,都有了很大的进展。本文从宝石资源与宝石矿物研究、现代宝石学研究重点和未来宝石学研究发展趋势三个方面,论述了我国宝石学10年发展的概况。 相似文献
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宝石及中国宝石资源开发(2)李家珍《矿产与地质》编辑部宝石是大自然赐予人类的一种天然的矿物单晶体,具有鲜艳的色彩、透明度好、硬度高和稀罕的特征,经琢磨成形,用来镶嵌装饰,具有鉴尝、使用和珍藏的价值。宝石种类繁多,世界五大珍贵宝石有钻石、蓝宝石、红宝石... 相似文献
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橄榄石宝石属橄榄石(Olivine)族矿物,化学组成:(Mg、Fe)2SiO4,镁、铁之间为完全类质同象,宝石级橄榄石的化学组成为富镁端元的镁橄榄石和贵橄榄石,含微量Mn、Ca、Al、Ti、Ni等元素。斜方晶系,晶体沿C轴呈柱状或短柱状,完好晶形者少见,一般多呈粒状。通常为中—深草绿色(亦称橄榄绿 相似文献
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吉林省蛟河橄榄石宝石矿床地质特征及成矿条件研究 总被引:2,自引:0,他引:2
吉林省蛟河橄榄石宝石矿床是我国少数几个重要的有色宝石矿床之一。该矿床主要受新生代NE向敦密断裂带以及次级NW向超壳断裂控制,是第三纪船底山期火山喷发的产物。矿石主要为橄榄岩包体。地幔深处的富粗晶橄榄岩,超壳深断裂带,岩浆的快速上升构成了成矿的基本条件。 相似文献
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世界宝石资源开发已有上万年的历史,文明古国的中国开发历史更加悠久。随着世界经济的发展,当今宝石日益被人们所注目。目前世界宝石资源产量有限,珠宝市场供需矛盾突出;中国宝石资源相当短缺,中、高档宝石稀少。今后地矿部门有必要加强宝石资源地质工作,探索新的找矿领域,迎接面临的世界珠宝市场的挑战。 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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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 Lozach 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
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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
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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
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正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献