蓝田县灞源张家沟一带地球化学特征及找矿远景

在1∶1万土壤地球化学测量基础上,对元素的分布特征、组合特征、地球化学特征与地质背景关系、单元素异常特征、组合异常特征、综合异常特征进行分析研究,发现蓝田县灞源张家沟一带金、铅、锌、钨及铌钽铷元素土壤地球化学测量异常特征明显,具有良好的成矿前景。     

面向人工智能识别的岩浆岩断面形态特征研究

为了研发手机识别岩石的软件,以岩浆岩基础数据库的建立为重点,开展岩浆岩断面外部特征的基础研究.根据可直接用于人工智能识别外部特征的标准,即能够直接被手机摄像头识别、计算机量化和获取特征的标准,筛选出6个具有人工识别意义的外部形态特征,分别是颜色特征、结晶程度、相对粒度、绝对粒度、构造特征和断口特征.根据每种特征不同的量...     

煤层反射波特征及其岩性解释

利用煤层反射波的初至特征、相位特征、振幅特征、频率特征和波组特征的变化,可以解释煤层缺失,分析煤层沉积环境,对比煤层分叉,确定构造断裂和预测煤层厚度变化趋势等。      

平武-松潘地区水系沉积物地球化学特征及找矿方向

依据1∶5万水系沉积物测量资料,分析研究了平武-松潘地区水系沉积物元素背景特征、不同地质体的地球化学特征、单元素异常特征、元素共生组合特征、综合异常特征等,并优选了找矿远景区,指明了找矿方向。     

平武-松潘地区水系沉积物地球化学特征及找矿方向

依据1∶5万水系沉积物测量资料,分析研究了平武-松潘地区水系沉积物元素背景特征、不同地质体的地球化学特征、单元素异常特征、元素共生组合特征、综合异常特征等,并优选了找矿远景区,指明了找矿方向。     

论冰碛石的形态特征及其与泥石流石的区别

长期以来流行的球度和圆度概念不足以刻画冰碛石及其他成因砾石的细微特征,需要在其基础上进一步挖掘有判别价值的标志性特征.针对冰碛石与泥石流石辨识的疑难问题,提出外接圆特征、粗糙度特征、圆度-体积特征以及混杂堆积砾石形态构成特征等几个概念.通过这些特征研究,结合真实的冰川擦痕、颤痕等标志,可更加准确地进行冰川沉积物与其他成...     

四川汉源县瓦板山磷矿矿体及矿石特征

在介绍瓦板山磷矿含磷层特征的基础上,进一步阐述了矿体厚度、品位、形态特征及矿石结构、构造、矿物组成、化学组分、风化特征、矿石类型等矿石特征。     

四川汉源县瓦板山磷矿矿体及矿石特征

在介绍瓦板山磷矿含磷层特征的基础上,进一步阐述了矿体厚度、品位、形态特征及矿石结构、构造、矿物组成、化学组分、风化特征、矿石类型等矿石特征。     

原平市东餐食铝土矿地质特征及找矿标志

通过对山西东餐食铝土矿含矿岩系特征、矿体特征、矿石质量特征、矿石类型(品级)和矿床成因研究,得出了该区铝土矿的地质特征及分布规律,提出了找矿标志。     

吉林省安图县旭阳屯金矿地质特征及成矿规律

文章结合区域成矿地质背景,以旭阳屯金矿地质勘查成果资料为依据,对矿区地层、构造、变质作用、地球物理特征、地球化学特征、矿体特征、矿石特征等进行了论述,分析矿床成因、控矿因素,总结成矿规律,探讨找矿方向及找矿潜力。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

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.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

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.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

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).     

HYDROGEOLOGY

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     

METAMORPHIC PETROLOGY

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),     

SERIALS

正~~     

GEOPHYSICAL EXPLORATION

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-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

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-     

PETROLEUM GEOLOGY

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.)     

GEOCHEMISTRY

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