共查询到20条相似文献，搜索用时 734 毫秒
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淡水养殖珍珠的矿物组成特征 总被引：7，自引：1，他引：7
采用粉末X射线衍射分析及显微激光拉曼光谱对三角帆蚌养殖珍珠的矿物组成进行了研究。结果表明，浙江诸暨产三角帆蚌淡水珍珠的矿物组成主要为文石。在无商业价值的部分珍珠中存在六方碳钙石。其中具珍珠光泽的珍珠层一般呈半透明状，均为文石组成；无珍珠光泽的不透明层有时由文石组成，有时由六方碳钙石组成。三角帆蚌淡水养殖珍珠中不存在方解石，这与海水养殖珍珠中存在方解石明显不同。 相似文献
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西天山乌拉根大规模铅锌成矿中H_2S成因:菌生结构和硫同位素组成约束 总被引：1，自引：0，他引：1
乌拉根铅锌矿是中国西北地区目前探明金属量最大的铅锌矿床,但大规模成矿所需H2S的成因方式尚不清楚。在野外调查和矿相学观察基础上,论文通过场发射扫描电镜(FESEM)、能谱(EDS)和质谱(MS)观测分析表明,矿石中发育闪锌矿纳米莓球、丝/管状结构,它们由他形闪锌矿微晶集合而成,莓球直径30~700nm,丝/管状结构与莓球密切共生;常见与闪锌矿等矿石矿物共生的方解石纳米莓球结构,由他形方解石微晶集合而成,莓球直径20~800nm;也常见与矿石矿物共生的菱铁矿微米莓球、丝/管状结构,它们由他形菱铁矿微晶集合而成,莓球直径1~3μm,表面毛糙,丝/管状结构常出现在莓球周围并连接着莓球。这些纳/微米莓球在矿石中成群落不均匀分布,属细菌微生物成因,丝/管状结构为胞外聚合物的表现。矿石δ34SCDT变化大且显著偏负值(-27.9‰~15.0‰)。乌拉根大规模铅锌硫化物成矿所需H2S可能主要通过细菌硫酸盐还原(BSR)产生,盆地流体中烃类有机质催化下的细菌微生物硫酸盐还原反应是乌拉根铅锌大规模成矿的重要过程。 相似文献
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采用拉申指数和雷兹诺指数等指数判定法对四川省康定地热区4个地热井和3个温泉热水的碳酸钙结垢趋势进行计算和判定,并判定了硫酸钙和硅酸盐的结垢趋势,然后采用Na-K-Mg三角图解和WATCH程序进一步进行热储矿物平衡分析,结果表明:该区部分地下热水有结垢的可能性,主要结垢物是碳酸钙,引起结垢的矿物主要有方解石、滑石、温石棉。结果可为当地地热开发利用提供参考,也为同类研究提供一个实例。 相似文献
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为探究一种灰黑色砭石的矿物学特征及成因,采用X射线粉晶衍射(XRD)、扫描电子显微镜(SEM)、热重-微商热重分析(TG-DTG)及激光诱导离解光谱(LIBS)等分析方法对其矿物组成、结构特征、热力学性质及化学成分进行分析。结果表明,灰黑色砭石主要组成矿物为方解石(>98%),并含有少量石英、云母、长石、黄铁矿及微量石墨(<2%)。晶面尺寸测试及SEM分析结果显示,以上矿物单晶粒径大多处于纳米级别,砭石中矿物主要以块状、棒状及片状等3种集合体形式存在。微晶石墨呈分散态赋存在砭石中是灰黑色砭石致色的主要原因,而石英、云母、长石、黄铁矿及石墨等杂质的存在、纳米级的结构特征和类质同象导致砭石中方解石的热解温度远低于标准的纯方解石。砭石中纳米级方解石微球粒及石墨和黄铁矿微晶的存在,说明纳米级灰黑色砭石的形成可能与微生物的活动密切相关。 相似文献
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磬云石是产于灵璧地区震旦系张渠组地层中的一种微晶灰岩,以其色黑致密且敲击能发出青铜质的声音,而成为观赏名石和制作敲打乐器。磬云石主要矿物组成为微晶方解石,晶体自形程度较好,粒度均小于10μm,紧密镶嵌排列,富含有机质。在元素地球化学特征上,磬云石含有高的CaO含量,低的MgO、SiO2、Fe2O3、Al2O3含量,低的稀土元素含量,富集Sr、Cu、Mn、Ba等元素。通过与该套震旦系地层中产出的其他微晶灰岩对比研究表明,磬云石的矿物组成单一,颗粒大小均匀,颗粒排列紧密,颗粒间孔洞小且少,含有较高的有机质含量等特征,是其敲击能发出青铜质声音的主要原因。磬云石的形成与震旦纪时全球高的CO2浓度以及该区多发的地质事件有关,是震旦纪海水过饱和CaCO3的沉积环境与该区复杂的地质事件联合作用的结果。 相似文献
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国内应用的天然太物牙膏磨擦剂主要是方解石，方解石属三方晶系矿物，以菱面体，板状，柱状存在，因此，对牙齿的磨擦值波动较大。淡斜绿泥石属层状硅酸盐矿物，片状形态，硬度比方解石低，做牙膏的摩擦剂显然优于方解石。它不公对牙齿磨损小，而且具有洁齿，护齿性能。 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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Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931. 相似文献
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正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.) 相似文献
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正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.) 相似文献
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正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.) 相似文献
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正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus., 相似文献
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正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an 相似文献
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正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of 相似文献
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正20140582 Fang Xisheng(Key Lab.of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China);Shi Xuefa Mineralogy of Surface Sediment in the Eastern Area off the Ryukyu Islands and Its Geological Significance(Marine Geology Quaternary Geology,ISSN0256-1492,CN37 相似文献
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正20141810 Bian Yumei(Geological Environmental Monitoring Center of Liaoning Province,Shenyang 110032,China);Zhang Jing Zoning Haicheng,Liaoning Province,by GeoHazard Risk and Geo-Hazard Assessment(Journal of Geological Hazards and Environment Preservation,ISSN1006-4362,CN51-1467/P,24(3),2013,p.5-9,2 illus.,tables,refs.) 相似文献