利用ΔT异常反演居里面深度的一种新方法

多年来,国内外有关学者提出了多种反演居里面深度的方法,但都不同程度地存在着局限性。利用ΔＴ异常反演居里面深度的一种新方法是中国地震局和青岛海洋大学的专家经研究于近期提出的。该方法分为２个步骤：１．用多次插值切割法从总磁异常中分离出由居里面起伏引起的ΔＴ异常;２．用二维单一磁性界面深度的非线性反演的样条函数法对由居里面起伏引起的ΔＴ异常进行反演得到居里面深度。对较复杂的模型和南海沿１０°Ｎ纬线剖面居里面深度的反演均取得了较好的结果。指出南海居里面深度比莫霍面深度浅一些,二者的起伏形态有一定的一致性…     

关于磁性界面拟合反演公式及其推广

本文对Peters提出的用于磁性界面正反演的基本公式进行了严格推导。指出该公式只是一阶近似意义下的公式,并导出二阶近似、三阶近似意义下的公式。论述了该公式可用于分层反演;且不需要假定界面的起伏h(ξ,η)远远小于平均深度d;但侧边周界必须足够大。最后,将上述均匀且垂直磁化的公式推广到横向非均匀且任意方向磁化的情况。     

塔里木盆地老虎台—和田条带域深部构造研究

利用高精度航磁资料采用对应分析、图像处理、人机交互等新方法及各种常规处理手段，并结合地质和其它地球物理资料对研究区结晶基底的起伏状态、性质、居里面起伏变化特征以及深部断裂构造的展布格局等作了研究；计算了该条带域地壳磁层上、下界面深度；圈定了各类火成岩体的分布范围以及不同级次的断裂构造１１条；指明了基底岩相的分布特征；阐述了结晶基底以及居里面起伏变化特征，并对该条带域油气远景作出了评价     

塔里木盆地东部边缘区深部构造研究

利用高精度航磁资料,应用对应分析、图象处理、人机交互等方法以及多种常规处理手段（化极、上延、滤波、导数、视磁化率、基底和居里面深度等）,并结合地质和其它地球物理方法对研究区基底的岩相变化、基底和居里面的起伏状态以及深部断裂构造的展布格局等问题进行了研究     

塔里木盆地老虎台—和田条带域深部构造研究

利用高精度航磁资料采用对应分析，图像处理，人机交互等新方法及各种常规处理手段，并结合地质和其它地球物理资料对研究区结晶基底的起伏状态，性质，居里面起伏变化特征以及深部断裂构造的展布格局等作了研究，计算了该条带域的地壳磁层上，下界面深度，圈定了各类火成岩体的分布范围以及不同级次的断裂构造１１条，指明了基底岩相的分布特征，阐述了结晶基底以及居里面起伏变化特征，并对该条带域油气远景作了评价。     

气候变化对浅层地温测量影响的改正

实测的浅层地温受地表温度周期性日变和年变的影响,使得正常浅层地温发生畸变。为了改正其影响,对实测的离散温度数据进行离散富里叶变换,将地表温度转化为富里叶级数形式,可以得到富里叶振幅谱和相位谱,进而获得地表温度变化对地下温度场的影响深度和程度的数学表达式。地表温度变化周期长,且地下介质热扩散率大,则地温受影响的深度和程度大;反之则小。     

利用中梯装置实测曲线确定岩(矿)脉深度的实验公式

野外最常见的脉状地质体几何参数(长、宽、延深、倾角、走向等)多,其ρ_s或η_s的理论公式复杂,至今还没有导出求深度的理论公式.根据模型实验资料,我们总结出利用中梯装置测得的ρ_s曲线来确定高阻岩(矿)脉上顶深度h的实验公式,对公式的应用作了讨论,并将它推广应用于中梯装置η_s曲线的解释.     

长方体重力异常的近似计算法

长方体可以组合成各种不规则的三度体,下面的长方体重力异常公式常常成为解释方法中的基本公式: 其中R~2=(ξ-x)~2 (η-y)~2 (ζ-z)~2;x、y、z为测点坐标;ξ、η、ζ为长方体每个角点的坐标。这个公式精度虽高,但计算费时,造成在有些机器上某些解释方法不能实现。在区城重力资料解释中,为了加快计算速度,我们将上述公式简化为:     

基于重磁场的延边微板块地壳结构特征研究

延边地区位于多个微板块的结合部位,区内发育长白山活动火山群,地震活动频繁。本文通过重磁小波多尺度分解与莫霍面、居里面深度反演分析,研究延边地区的微板块地壳结构特征。其中敦化-密山断裂以东的胶辽地块地壳厚度最大,约38~40km,兴凯地块则最小,约34~36km,敦化-密山断裂以西的松嫩地块地壳厚度变化平缓,约36~37km;NE向敦化-密山断裂为延边地区的一级断裂,切穿莫霍面,为松嫩地块的东侧边界;NW向展布的富尔河-红旗河断裂、秋梨沟老头沟断裂与汪清-敬信断裂则属于胶辽地块与兴凯地块之间的缝合带,控制居里面分区及形态,而居里面隆起区及其边缘则多分布火山口,表明居里面的局部隆起与岩浆活动关系密切。     

解斜磁化水平圆柱体磁异常的JU变换法

目前，求解各种形体磁异常的富里叶变换法，特别是快速富里叶变换法，已被广泛应用；希尔伯特变换方法也已引入了磁异常的解释领域。笔者在学习特殊函数论时发现，建立一种正交于1     

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

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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