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1.
《物探化探计算技术》2020,(4)
对采自雷州半岛48个表层土壤样品进行了常量组分地球化学特征分析,通过常量组分含量分布特征、富集与淋失系数、相关性分析等研究发现:表土中SiO_2、Al_2O_3、Fe_2O_3含量较高,占常量组分总量的88.13%;同时, Al_2O_3、Fe_2O_3、TiO_2富集,明显高于全国土壤元素均值,且Fe_2O_3显著高于UCC均值,具明显的富铁化,而K_2O、CaO、Na_2O、MgO显著低于全国和UCC平均值;受母岩影响,研究区SiO_2含量异常低值集中分布区域与基性火山岩出露区高度耦合,异常高值分布区则主要位于海成阶地、海积平原和花岗岩、砂页岩出露区;SiO_2与Al_2O_3、Fe_2O_3、TiO_2呈强烈负相关关系,Al_2O_3与Fe_2O_3、K_2O、CaO、MgO、TiO_2分布特征具有相似性,呈现良好的正相关关系。 相似文献
2.
莫来铁尖晶岩中的莫来石是首次发现的一种火山岩型莫来石。在全岩X射线粉晶衍射图上莫来石的d值(nm)为:0.5378(5),0.3428(9),0.3385(10),0.2693 (4),0.2545(5),0.2295 (2),0.1601 (2),0.1542 (4),0.1443 (2)。电子探针分析结果,莫来石的成分(%)为:SiO_2 28.96,TiO_2 0.53,Al_2O_3 67.13,FeO 3.06,MnO 0.05.MgO 0.02,Na_2O 0.21,K_2O 0.02,Cr_2O_3 0.05, NiO 0.02。这种莫来石是从玄武岩浆演化后期产生的富Al_2O_3、FeO(Fe_2O_3)和贫SiO_2的莫来铁尖晶岩浆中直接结晶而成的。 相似文献
3.
湘南界牌岭含锡花岗斑岩的岩石学特征 总被引：3，自引：0，他引：3
界牌岭含锡花岗斑岩是岩浆作用晚期强烈分异之产物。该岩体具有富硅(S1O_271.95～76.71％)和碱(K_2O4.25～6.92％),贫铁(Fe_2O_3+FeO为1.17～2.94％)和镁(MgO0.17～0.58％),富挥发分氟(F 0.013～3.38％)和成矿元素,分异指数(DI>85)高的特征,为陆壳重熔型花岗斑岩,且为成矿母岩。岩体围岩蚀变—矿化分带较明显,锡矿化主要集中在黄玉—萤石—云英岩化带内。界牌岭斑岩为陆壳重熔型含锡花岗斑岩。 相似文献
4.
用计算机选取地球化学找矿参数 总被引：1，自引：0，他引：1
前人总结的地球化学找矿参数,大多数是作者个人对该矿种地球化学特征的经验性总结,局限性较大。为了探索更有助于找矿的地球化学参数,我们以钾镁煌斑岩型金刚石矿床为例,用计算机对国内外已知含金刚石程度的17个岩体的30件样品中SiO_2、Al_2O_3、Fe_2O_3、FeO、MgO、CaO、NaO、K_2O、CO_2、MnO、P_2O_5、TiO_2共12个分析项目进行了任一组合方式的计算,然后对每一组合参数进行错判率检验,最终选出错判率小于6—10％的钾镁煌斑岩型金刚石矿床地球化学找矿参数为:MgO/MnO、CaO/TiO_2、SiO_2/(Na_2O+K_2O+CO_2)、K_2O/(CO_2+MnO),MgO/(MgO+CaO+K_2O+NO_2O)等22个 相似文献
5.
玻璃陨石发现于电白县小良乡的冲积层中,呈黑色—沥青黑色,相对密度为2.34—2.37,玻璃—沥青光泽,条痕无色,摩氏硬度为6—6.5。在偏光镜下观察为均质体,油浸法测得折光率约为1.503～1.506(t=14℃)。陨石表面布满了大小不等、形状各异的气孔,陨石本身的形状为圆形、长柱状圆形、扁豆状等。陨石的化学成分(平均值):SiO_2 74.956,Al_2O_3 12.486,(FeO+Fe_2O_3)4.346,CaO 1.934,MgO 1.872,MnO 0.072,TiO_2 0.7,K_2O 2.588,Na_2O 0.806。 相似文献
6.
应用陆地卫星 TM 资料对南盘江地区进行了烃类微渗漏蚀变信息检测研究。岩石土壤地球化学特征分析表明,该区不同程度地存在着“褪红”、“粘土矿化”、“碳酸盐矿化”等烃类蚀变异常现象。选择 FeO/Fe_2O_3作为褪红的成分因子;(K_2O+Na_2O+Al_2O_3)、(K_2O+Na_2O)/Al_2O_3、(K_2O+Na_2O+Al_2O_3)/S∶O_2和 K_2O/Na_2O 等作为粘土矿化的成分因子;CaO+MgO 和 CaO/MgO 作为碳酸盐矿化的成分因子。利用 TM1/TM3、TM1/TM4识别褪红蚀变信息,TM5/TM7、TM5/TM4用干识别粘土矿化和碳酸盐矿化蚀变信息。建立了地球化学—光谱—遥感图像三位一体的遥感找油气模式,根据油气遥感色调异常对南盘江地区进行了评价和分类。 相似文献
7.
滇西梁河县新发现的那俄铍矿是一含绿柱石岩浆热液伟晶岩脉型铍矿床,矿体产状多数为北东-南西向延伸,延伸走向长50～1220 m,厚度0.36～3.70 m,品位0.045%～1.79%,并伴生有铌钽铷等多种稀有金属。该矿床围岩主要为二长花岗岩、石英二长闪长岩等。二长花岗岩类SiO_2=65.02%～73.65%,Al_2O_3=13.27%～16.80%,K_2O/Na_2O=1.18～2.07,A/NCK=1.05～1.15,表现出高硅、富碱、低镁铁的特点;石英二长闪长岩(花岗闪长岩)类SiO_2=51.03%～65.88%,Al_2O_3=15.97%～18.56%,K_2O/Na_2O=0.57～0.86,A/NCK=0.83～1.10;花岗伟晶岩SiO_2=75.16%,Al_2O_3=13.52%,K_2O/Na_2O=1.39,A/NCK=1.08,δEu=0.13～0.36,分异指数85,与围岩差异较大,认为那俄铍矿为岩浆热液演化晚期分异结晶形成。研究区所在的勐养岩体锆石U-Pb年龄127.9±1.0～115.2±1.1 Ma,均为早白垩世。通过对研究区的区域大地构造演化、岩石地球化学和U-Pb年代学特征研究认为,那俄地区在早白垩世经历了早期陆内应力调整期、中期构造活跃期、晚期岩浆热液成矿期三个差异明显的构造-岩浆阶段,而那俄铍矿的形成则是晚期岩浆热液作用的结果。 相似文献
8.
镁铬质耐火材料是建材工业上很有发展前途的一种耐火材料,主要由尖晶石类矿物和方镁石按一定比例烧制而成。由于烧制过程中生成了MgO、FeO、Al_2O_3、Cr_2O_3、Fe_2O_3组成的多元固熔体,因而具有耐高温,抗酸碱等性能,分析中分解试样较难。本文试验了试样的最佳分解条件并初探了分解机理。拟定不分离铬,一次取样测定耐火材料中SiO_2,Al_2O_3、Fe_2O_3、TiO_2、MgO、CaO、Cr_2O_3、K_2O、Na_2O的分析流程,用于镁铬质耐火材料分析,分析结果与常规分析方法相吻合。 相似文献
9.
黑云母热光性的研究 总被引：1，自引：0，他引：1
一、概述本文研究的黑云母(少铁黑云母Meroxen),颜色为黑褐色,折射率Ng=1.6112,光轴角(-)2V=4°,色散V>γ.其化学成分(重量%)如下:SiO_2 36.95,Al_2O_3 16.69,Fe_2O_3 1.94,FeO6.37,MgO 20.22,CaO 0.14,Na_2O 0.45,K_2O 9.63,H_2O~+ 3.96,H_2O~- 0.68,TiO_2 2.38,P_2O_5 0.12,MnO O.12,F 0.62,总和为100.27.晶体化学式为:(K_(0.90)Na_(0.06)Ca_(0.01))_(0.97)(Mg_(2.21)Fe_(0.39)~(2+)Fe_(0.11)~(3+)Mn_(0.01)Ti_(0.13)Al_(0.15))_(3.00)(Si_(2.71)Al_(1.29))_(4.00)O_(10)(O_(1.23)OH_(0.62)F_(0.15))_(2.00).从常温到1500℃,每隔100℃,在高温炉内加热一个样品,恒温一小时后取出淬火.对加热后的样品分别作了肉眼及光性鉴定,其中折射率用油浸法,光轴角用弗氏台干涉图法测定. 相似文献
10.
K_2O/(Na_2O+CaO)--SiO_2/Al_2O_3:一个用于推断复理石形成时板块构造背景的判别图 总被引：1，自引：0，他引：1
沉积岩中的主要氧化物:SiO_2,Al_2O_3,K_2O,Na_2O,CaO的丰度及其SiO_2/Al_2O_3,K_2O/(Na_2O+CaO)值的变化与物源区类型和板块构造背景密切相关。因此,利用砂岩的化学成分可以判断其形成时的板块构造背景。笔者重点研究了造山带中重要且分布广泛的复理石中杂砂岩的化学成分及其与板块构造背景之间的关系,绘制了用于推断复理石形成时的板块构造背景的SiO_2/Al_2O_3——K_2O/(Na_2O+CaO)双变量判别图。经对15组不同时代复理石的180个化学成分进行投影分析,能有效地分开不同板块构造背景下的复理石。 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.
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
15.
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
16.
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
17.
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
18.
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
19.
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
20.
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