RECENT TECTONIC DEFORMATION ANOMALY AND EARTHQUAKES IN GANSU-NINGXIA-QINGHAI AREA     

Wang Shuangxu  Zhang Xi  Zhang Sixin  Xue Fuping 《大地测量与地球动力学》2003,23(Z1)

1　IntroductionAccordingtogeologicalstructure ,theGansu Ningxia Qinghaiareabelongstothenortheastmar ginofQinghai Tibetblock .Thisareahasbeenpaidmuchattentionby geo specialistsinChinaandabroadbecauseofitssignificanttectonicmovement,itsintensiveseismicity ,anditsimportanceinearth quakehazardmitigation .IntheDevelopmentPro gramonNationalKeyBasicResearchesundertheProject“MechanismandPredictionofContinentalStrongEarthquakes”,themechanismsofcontinen talstrongearthquakesarestudied ,usinghypo…  相似文献   

改进的能量守恒方法及其在CHAMP重力场恢复中的应用(英文)   总被引：1，自引：0，他引：1  

XU Tianhe HE Kaifei Xi’an Research Institute of Surveying  Mapping  Middle Yanta Road  Xi’an  China. 《地球空间信息科学学报》2008,11(3):168-173

An efficient method for gravity field determination from CHAMP orbits and accelerometer data is referred to as the energy balance approach. A new CHAMP gravity field recovery strategy based on the improved energy balance approach IS developed in this paper. The method simultaneously solves the spherical harmonic coefficients, daily Integration constant, scale and bias parameters. Two 60 degree and order gravitational potential models, XISM-CHAMPO1S from the classical energy balance approach, and XISM-CHAMPO2S from the improved energy balance, are determined using about one year＇s worth of CHAMP kinematic orbits from TUM and accelerometer data from GFZ. Comparisons among XISM-CHAMPO1S, XISM-CHAMPO2S, EIGEN-CGO3C, EIGEN-CHAMPO3S, EIGEN2, ENIGNIS and EGM96 are made. The results show that the XISM-CHAMPO2S model is more accurate than EGM96, EIGENIS, EIGEN2 and XISM-CHAMPO1S at the same degree and order, and has almost the same accuracy as EIGEN-CHAMPO3S.  相似文献   

Formation Dynamics and Quantitative Prediction of Hydrocarbons of the Superpressure System in the Dongying Sag   总被引：1，自引：0，他引：1  

SUI Fenggui  HAO Xuefeng  LIU Qing  ZHUO Qin’gong  ZHANG Shouchun 《《地质学报》英文版》2008,82(1):164-173

Based on the theory of formation dynamics of oil/gas pools, the Dongying sag can be divided into three dynamic systems regarding the accumulation of oil and gas： the superpressure closed system, the semi-closed system and the normal pressure open system. Based on the analysis of genesis of superpressure in the superpressure closed system and the rule of hydrocarbon expulsion, it is found that hydrocarbon generation is related to superpressure, which is the main driving factor of hydrocarbon migration. Micro fractures formed by superpressure are the main channels for hydrocarbon migration. There are three dynamic patterns for hydrocarbon expulsion： free water drainage, hydrocarbon accumulation and drainage through micro fissures. In the superpressure closed system, the oil-driving-water process and oil/gas accumulation were completed in lithologic traps by way of such two dynamic patterns as episodic evolution of superpressure systems and episodic pressure release of faults. The oil-bearing capacity of lithologic traps is intimately related to reservoir-forming dynamic force. Quantitative evaluation of dynamic conditions for pool formation can effectively predict the oil-bearing capability of traps.  相似文献   

CLIMATIC RECORDS FROM ANNUAL LAYERS AND STABLE ISOTOPES OF A STALAGMITE IN BEIJING OVER THE LAST 2300 YEARS     

Tan Ming Qin Xiaoguang Liu Tungsheng Laboratory of Speleothem  Paleoclimatology  Institute of Geology  CAS  Beijing People’s Republic of China 《地理学报(英文版)》1997,(3)

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GEOCHEMICAL CHARACTERISTICS OF GRANITES AND ITS STRUCTURAL GENETIC ENVIRONMENT IN THE NANDAN-HECHI METALLOGENETIC BELT, NORTHWEST GUANGXI   总被引：3，自引：0，他引：3  

GUANGXI CAI Minghai  LIANG Ting  WU Decheng  HUANG Huimin * 《大地构造与成矿学(英文版)》2004,28(2):128-141

The Nandan-Hechi metallogenetic belt is the most important tin-polymetallic producing district in China, and is the location of the Dachang super-large tin deposit. Based on the detailed field investigation and isotopic data, the stages of magmatic activity in the Nandan-Hechi metallogenetic belt have been lined out in this paper. Through the study about the geochemical characteristics of different granites, and by using ω(Al2O3)-ω(SiO2), ω(TFeO)/[ω(TFeO) ω(MgO)]-ω(SiO2), AFM, ACF and Rb-Yb Ta, Rb-Y Nb,Ta-Yb, Nb-Y discrimination diagrams in combination with regional geological setting analysis, the authors carried out analyses about the structural environment for the formation of the granites, and discussed the structural environment and dynamic setting for the large scale mineralization in this area. Our study indicates that the majority of the granites in Nandan-Hechi metallogenetic belt belong to the POG type,while the later stage alaskite belongs to the RRG CEUG type. The granites were formed at the stage of structural transformation from postorogenic phase to intraplate setting. But the major structural environment is characterized by steady regional extension. The formation age for the granites coincides with the time for this transformation, and this translation environment is favored for large-scale metallogenesis.  相似文献   

Source time-function as discriminant using empirical Green’s function     

HE Yongfeng  & CHEN Xiaofei . Department of Geophysics  School of Earth & Space Sciences  Peking University  Beijing  China  . North-West Institute of Nuclear Technology  Xi’an  China 《中国科学D辑(英文版)》2005,48(12):2118-2122

Since the sign up of CTBT (Comprehensive Test Ban Treaty), the nuclear monitoring and distinguishing has gained great attention by the treaty countries. Seismology is one of the primary technical means available for monitoring compliance to a CTBT. However, there does not exist a single criterion, so far, that can effectively distinguish explorations from earthquakes. It has been known that source time function (abbreviated to STF) of an underground nuclear explosion contains important p…  相似文献   

The Characteristics and Its Geological Significance of Fluid Inclusions in Yingchengzi Gold Deposit, Heilongjiang Province     

CHAI Peng  SUN Jinggui  GU A’lei  ZHAO Keqiang 《《地质学报》英文版》2014,88(Z2):688-689

Please refer to the attachment(s) for more details  相似文献   

Complete mitochondrial genomes of two deep-sea pandalid shrimps,Heterocarpus ensifer and Bitias brevis:insights into the phylogenetic position of Pandalidae(Decapoda:Caridea)     

SUN Shao’e  CHENG Jiao  SUN Song  SHA Zhongli 《海洋湖沼学报（英文）》2020,(3):816-825

The mitochondrial genome(mitogenome)analysis is a significant tool for investigating the evolutionary history of metazoan animals.The family Pandalidae is a diverse caridean group containing mainly deep-sea species.Until May 302019,only two complete mitogenomes are available in GenBank.Here we present the complete mitogenome sequences of two deep-sea pandalid shrimps,Heterocarpus ensifer and Bitias brevis through Illumina sequencing.The mitochondrial genomes were determined to be 15939 bp and 15891 bp long,and both consist of 13 protein-coding genes(PCGs),23 transfer-RNA genes(tRNAs),two ribosomal-RNA genes(rRNAs),and one control region.The nucleotide composition is biased toward adenine and thymine.Overall,the gene contents and arrangements are consistent with the pancrustacean ground pattern.The alignment of the control regions of four pandalids reveals a conserved sequence block(CSB)(104 bp in length,average GC%=29.47%and 69.23%similarity).A phylogenetic analysis based on 51 Caridea complete mitogenomes revealed that the deep-sea pandalid shrimps are situated an intermediate lineage,with a tendency to originated from those living in shallow sea area.  相似文献   

Petrography，Zircon U-Pb Geochronology and Geochemistry of the Mafic-ultramafic Intrusion in Xiarihamu Cu-Ni Deposit from East Kunlun, With Implications for Geodynamic Setting     

WANG Guan  SUN Fengyue  LI Bile  LI Shijin  ZHAO Junwei  AO Cong  Yang Qi’an 《《地质学报》英文版》2014,88(Z2):318-319

Please refer to the attachment(s) for more details  相似文献   

Making and unmaking continental mantle: Geochemical and geophysical perspectives     

William L. Griffin  Suzanne Y. O’Reilly 《《地质学报》英文版》2018,92(Z1):249-250

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