~(40)Ar/~(39)Ar Age and Geological Significance of Lamprophyres in Pishan on the SW Margin of the Tarim Terrane, NW China   总被引：2，自引：0，他引：2  

Ariel BOVEN 《《地质学报》英文版》2003,77(1):36-43

The dike swarm of lamprophyres at Pishan on the SW margin of the Tarim terrane is composed of ultra-potassic lamprophyres that have intruded into the Proterozoic hornblende schists. 40Ar/39Ar dating data suggest that the isochron ages for phlogopite and whole rock separates of the lamprophyres are 231.7±0.3 Ma and 228.5±0.3 Ma, respectively. Geochemical data indicate that the dikes were derived from a subduction-related or metasomatized mantle. During the Middle-Late Triassic the western Kunlun area entered the post-orogeny period, and thus the occurrence of the dike swarm in the study area may have been controlled by underplating.  相似文献   

The observation and interpretation of geomagnetic variations in a small area of Hainan Province,China     

范国华  姚同起  顾左文  朱克佳  陈伯舫  冯戬云 《地震学报(英文版)》1997,10(3):329-337

ＴｈｅｏｂｓｅｒｖａｔｉｏｎａｎｄｉｎｔｅｒｐｒｅｔａｔｉｏｎｏｆｇｅｏｍａｇｎｅｔｉｃｖａｒｉａｔｉｏｎｓｉｎａｓｍａｌａｒｅａｏｆＨａｉｎａｎＰｒｏｖｉｎｃｅ，ＣｈｉｎａＧＵＯＨＵＡＦＡＮ１）（范国华）ＴＯＮＧＱＩＹＡＯ１）（姚同起）ＺＵＯ...  相似文献   

Stream Function Wave Derived by Unified Variational Principle of Water Gravity Wave     

Fu Yuhua Senior Engineer  China Offshore Oil Production Research Center  P.O.Box  Beijing 《中国海洋工程》1997,(2)

Based on the linear wave,solitary wave and fifth order stokes wave derived by use of the Uni-fied Variational Principle of Water Gravity Wave(UVPWGW),this paper derives stream function wavetheory by using UVPWGW.This paper will handle the Kinematic Free Surface Boundary Condition(KFSBC)and Dynamic Free Surface Boundary Condition(DFSBC)directly and give the optimum solu-tion,instead of the conditions ∑(Q_(av)-Q_i)~2=min,and the related equations of stational condition.When the wave height H,period T and water depth D are given,the original stream function wave willbe determined,and can not be adjusted if it does not agree with the real case;in the present method,the ad-justment can be done by adding several constraint conditions,for example,the wave profile can be ad-justed according to the condition of accurate peak position.The examples given in this paper show that forthe original stream function wave,the DFSBC can be fairly well satisfied,but the KFSBC can not;howev-er,the stream function wave derive  相似文献   

Estimation of JONSWAP Spectral Parameters by Using Measured Wave Data     

Fu Yuhua Senior Engineer  China Offshore Oil Development  Engineering Corporation  P. O. Box  Beijing 《中国海洋工程》1995,(3)

- This paper presents the method of determining JONSWAP spectrum by using measured wave data. If Hs, Tz and Tc are the measured significant wave height, average zero-up crossing wave period and average period between wave crests respectively and let y = T Z / TC; this paper provides equation to solve y fromf(y,y) = 0. From the solutions of this equation and by using LSM, the expression relating y as a function of y (for 2.54相似文献   

A numerical study of comparison of two one-state-variable,rate-and state-dependent friction evolution laws     

Jeen-Hwa Wang 《地震学报(英文版)》2009,(2):197-204

The two one-state-variable, rate-and state-dependent friction laws, i.e., the slip and slowness laws, are compared on the basis of dynamical behavior of a one-degree-of-freedom spring-slider model through numerical simulations.Results show that two(normalized) model parameters, i.e., Δ(the normalized characteristic slip distance) and β-α(the difference in two normalized parameters of friction laws), control the solutions.From given values of Δ, β, and α, for the slowness laws, the solution exists and the un...  相似文献   

Characteristics of Upper Mantle Activity in the South China Sea Region and the Indochina Mantle Plume   总被引：2，自引：0，他引：2  

WU Nengyou  ZENG Weijun  LI Zhenwu  CHEN Yizhong  WEN Xiwen  DU Deli  LI Guosheng Guangzhou Marine Geological Survey  MGMR  PO Box  Guangzhou 《《地质学报》英文版》1999,73(4):464-476

According to computed results of the mantle traction field beneath the lithosphere based on satellite-modelled gravity anomalies of different degrees, it has been revealed that the three types of mantle convection on different scales existing in the South China Sea region is the key factor controlling the geodynamics. The mantle convection models on large and middle scales have been proved by natural seismic S-wave tomographic data and interpreted by using the present mantle plume concept In consideration of other relevant geological and geophysical data, the authors put emphasis on discussing the expression form, origin and age of the Indochina mantle plume and its important effect on the conversion of organic matter and hydrocarbon accumulation in Cenozoic basins.  相似文献   

TOF-SIMS Study of the Hydrocarbon-generating Potential of Mineral-Bituminous Groundmass   总被引：5，自引：0，他引：5  

DAI Shifeng  REN Deyi  YANG Jianye  ZHANG Weibiao  JIAO FangliBeijing Graduate School  China University of Mining  Technology  P.O. Box  D Xueyuan Ro  Beijing 《《地质学报》英文版》2000,74(1):84-92

  相似文献   

Pulsation Solution to the Equation of Earth's Gravitational Field (Main Outcome)     

JIANG Zhi Gold Headquarters  P.O.Box  Beijing 《《地质学报》英文版》2000,74(2):297-300

Using d'Alembert equation as the approximation of Einstein's equation, a solution is given in this paper to the time-dependent gravitational equation of the Earth in consideration of the Earth's features, which describes the characteristics of pulsation of the Earth and the structures of spherical layers of its interior, thus providing a theoretical basis for establishing the idea of mantle pulsation.  相似文献   

Integration of remote sensing and GIS in monitoring the dynamics of land cover in Oroba-Kibos catchment area, Kenya     

Were KO  Owenga PO  Wagate PN  Orlale R 《遥感学报》2011,15(3):595-603

Land cover in Kenya is in a state of fl ux at different spatial and temporal scales. This compromises environmental integrity and socioeconomic stability of the population hence increasing their vulnerability to the externalities of environmental change. The Oroba-Kibos catchment area in western Kenya is one locality where rapid land use changes have taken place over the last 30 years. The shrubs, swamps, natural forests and other critical ecosystems have been converted on the altar of agriculture, human settlement, fuel wood and timber. This paper presents the results of a study that aimed at providing spatially-explicit information for effective remedial response through (a) Mapping the land cover; (b) Identifying the spatial distribution of land cover changes; (c) Determining the nature, rates and magnitude of the land cover changes, and; (d) Establishing the drivers of land use leading to land cover changes in Oroba-Kibos catchment area. Bi-temporal Landsat TM imagery, fi eld observation, household survey and ancillary data were obtained. Per-fi eld classifi cation of the Landsat TM imagery was performed in a GIS and the resultant land cover maps assessed using the fi eld observation data. Post-classifi cation comparison of the maps was then done to detect changes in land cover that had occurred between 1994 and 2008. SPSS was used to analyze the household survey data and attribute the detected land cover changes to their causes. The fi ndings showed that 9 broad classes characterize the catchment area including the natural forests, swamps, natural water bodies, woodlands, shrublands, built-up lands, grasslands, bare lands and croplands. Croplands are dominant and accounted for about 65% (57122 ha) of the total land in 1994, which increased at the rate of 0.89% to 73% (64772 ha) in 2008, while natural water bodies has the least spatial coverage accounting for about 0.6% (561 ha) of the total land in 1994, which diminished at the rate of 3.57% to 0.3% (260 ha) in 2008. Climate, altitude, access and rights to land, demographic changes, poverty, political governance, market availability and economic returns are the interacting mix of proximate and underlying factors that drive the land cover changes in Oroba-Kibos catchment area.  相似文献   

Use of standard vocabulary services in validation of water resources data described in XML     

Jonathan Yu  Simon Cox  Gavin Walker  Paul J. Box  Paul Sheahan 《Earth Science Informatics》2011,4(3):125-137

The machine readable encoding language XML is used in water informatics to describe resources and observational data, such as the Water Data Transfer Format (WDTF). WDTF is part of an Australian initiative, established by the Australian Bureau of Meteorology in collaboration with CSIRO, to collate water resources data from multiple data providers into a national water information system. A common way of validating XML data is by defining a schema using XML Schema Definition language (XSD) and performing validation using standard XSD tools. However, XSD validation lacks the ability to perform content validation to assert context, domain and organizational rules such as soft-typing, co-constraints, and code-list or vocabulary checking, which is required in the validation of WDTF data. In this paper, we describe a validation service for validating water resources data encoded in WDTF, which combines structural and content validation. We also describe the use of a vocabulary service with the WDTF validation service to perform code-list and vocabulary checking.  相似文献