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Discovery of agglutinated foraminifers from the Longzhaogou Group in eastern Heilongjiang Province

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Science china Earth Sciences 2004年第2期47卷 122-127页

作者： LI Gang & YU Shanmao1. state Key Laboratory of Paleobiology Stratigraphy, Nanjing institute of {2. and Paleontology, Chinese Academy of Sciences, Nanjing 2.0008, china 2.108th Coal-prospecting Team of Geological bureau, NE china and Inner Mongolia Coal Company, Jixi 158100, china Correspondence should be addressed to Li Gang (email: gangli@***) 1. state Key Laboratory of Paleobiology Stratigraphy Nanjing Institute of Geology and Paleontology Chinese Academy of Sciences 210008 Nanjing China 2. 108th Coal-prospecting Team of Geological bureau NE China and Inner Mongolia Coal Company 158100 Jixi China

The low diversity agglutinated foraminifers are recovered from the Qihulin Formation of the Longzhaogou Group in eastern Heilongjiang, china. The foraminiferal fauna consists of 9 species of 5 genera. The common members are Cribrostomoides nonioninoides (Reuss), Haplophragmoides concavus (Chapman), H. gigas minor Nauss. Although the diagnostic zonal taxa are absent in the agglutinated fauna, according to the global stratigraphic distribution of the above-mentioned species, and the associated Pseudohaploceras ammonite fauna, the foraminiferal fauna may be of a Barremian-Aptian (Early Cretaceous) age.

关键词： Early Cretaceous, agglutinated foraminifers, Longzhaogou Group, eastern Heilongjiang, china.

Preliminary Study on Two Newly-Generated Seismotectonic Zones in North and Southwest china

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Earthquake Research in china 1996年第4期10卷 78-86页

作者： Xu Jie,Han Zhujun,Wang Chunhua,and Niu Lanfanginstitute of geology{2.,Beijing 10002.,china

In previous seismotectonic studies,the emphasis was placed on the inherited active fault *** the recent tectonic stage that essentially keeps in step with the current regional geologic environment and the stress field,however,there are also some newly generated fault *** studying the seismicity in North and Southwest china,it has been known that the NE-trending Tangshan-Hejian-Cixian and NW-trending Tengchong-Gengma-Lancang seismic zones are just two newly generated fault *** distinguished from the inherited fault zones,they are called the newly generated seismotectonic *** paper deals with the existence of these two seismogenic zones from their seismicity and geological structures,gives a preliminary analysis of their characteristics,and shows their significance.

关键词： Newly-generated seismotectonic zone North china Southwest china

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储层裂缝发育程度的判别准则

石油学报 2004年第4期25卷 33-37页

作者：张流周永胜中国地震局地质研究所北京100029

实验研究表明 ,变形导致的岩石微破裂会使岩石产生扩容 (体积膨胀 )和非线性变形。当差应力达到岩石的屈服应力时 ,扩容和非线性应变开始。此外 ,随应力水平的增加 ,扩容和非线性变形呈幂函数形式增加。在围压低时 ,最大扩容量呈上升趋... 详细信息

实验研究表明 ,变形导致的岩石微破裂会使岩石产生扩容 (体积膨胀 )和非线性变形。当差应力达到岩石的屈服应力时 ,扩容和非线性应变开始。此外 ,随应力水平的增加 ,扩容和非线性变形呈幂函数形式增加。在围压低时 ,最大扩容量呈上升趋势 ,围压较高时呈下降趋势 ;非线性应变量随围压的增加而呈单调增加。这一结果可作为评价裂缝型油气藏裂缝发育密集程度的一种判别准则。与以往用破裂准则、应力和应变能大小等评价裂缝发育程度的方法相比 ,它更真实地反映了裂缝形成、扩展直至饱和阶段与应力的对应关系。扩容和非线性变形之间的差异在于扩容更偏重于张性裂缝 ,非线性变形更偏重于剪切裂缝。

关键词：裂缝型油气藏微裂缝发育程度判别准则扩容非线性应变实验研究

Characteristics of Large Earthquake Recurrence and Determination of Average Recurrence Interval Value

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Earthquake Research in china 2000年第1期14卷 90-100页

作者： Ran Yongkang and Deng Qidonginstitute of geology,{2. seismological bureau, Beijing 10002.,{2. institute of geology China Seismological Bureau Beijing 100029 China

Paleoearthquakes in the Yanqing-Huailai basin and on the Haiyuan fault are studied in *** result indicates that the recurrence behavior of large earthquakes is of a wide *** earthquakes show the behavior characteristics of the activity of most faults,butthey are of different grades,the recurrence interval of large earthquakes is of staged nature,and the interaction between faults has effects on the recurrence sequence of large ***,when the recurrence behavior of large earthquakes is staged in time or when thegradation of characteristic earthquakes has led to a sharp difference in recurrence intervalbetween paleoearthquakes of different intensities,for estimating the large earthquake risk bythe deterministic method and time-dependent probabilistic method,it is necessary to calculatethe recurrence interval value separately for each specific stage or grade in order that theaverage recurrence interval values of different stages can be determined.

关键词： Paleoearthquake Earthquake recurrence Prediction of earthquake risk Recurrence interval

The structure features of stick-slip mechanism of the strike-slip earthquake generating structure in the interior of the Chinese mainland

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Acta Seismologica Sinica(English Edition) 1997年第3期10卷 2-9,11-12页

作者： WEN LIN HUAN XIAO DONG ZHANG ZHAO YI SONGinstitute of Geophysics, state seismological bureau, Beijing 100081,{2. 1. institute of Geophysics State Seismological Bureau 100081 Beijing China

This is the third one of the paper series on the strike slip earthquake generating structure in the interior of the Chinese mainland. The features of the tectonic stress field of strike slip earthquake generating structure were discussed in the first paper (Huan et al ., 1994), and the features of the deformation field of strike slip earthquake were presented in the second paper (Hun et al ., 1994). In the first section of this paper, through the analysis of the strike slip earthquake generating structure of several dozen large earthquakes with magnitude greater than 6.0, it is concluded that almost all strike slip earthquake generating faults are characterized by the oblique arranged distribution, and the barrier structure mode about the adhesive slip movement of strike slip is put forward; then in the second section, its four types, due to the different fracture form of the barrier at the ends, are also discussed; finally in the third section, the fracture terminating scale of the barrier of strike slip earthquake generating fault is also discussed.

关键词： the Chinese mainland stick slip movement barrier earthquake generating structure

THE REVELATION OF DYNAMIC CONTAMINATION ION SPECIES AND THEIR MASS CHARACTERISTICS IN ION MICROPROBE MASS ANALYSIS

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Chinese Science Bulletin 1982年第11期27卷 1209-1213页

作者：林卓然 institute of geology State Seismological Bureau Beijing

Ⅰ. INTRODUCTION As one of the fundamental problems in ion microprobe mass analysis the origin and mass characteristics of the interfering ion species due to dynamic contamination have long received attention but still not much been understood. In the case of metal and semiconductor, due to the present insufficient SIMS mass resolution, these

关键词： contamination understood SIMS DYNAMIC interfering insufficient suppress quartz unrelated 双比

Delineation of Potential Seismic Source Regions of Moderately Strong Earthquakes Without Seismogenic Tectonics

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Earthquake Research in china 1998年第2期12卷 78-84页

作者： Hu Yinlei and Zhang YumingDepartment of Civil and Structural Engineering, The University of Hong Kong, Hong Kong institute of geology,{2., Beijing, 10002., china

In this paper,approaches are developed to delineate the potential seismic source regions of moderately strong earthquakes that do not have clear seismotectonic *** on comprehensive analysis of regional tectonic backgrounds and seismicity,the data,such as isoseisrnals,spatial distribution of after shocks,regional tectonic stress field,and focal mechanisms,are employed for the delineation of the potential seismic source *** reliability of such potential seismic source regions is also discussed.

关键词： Moderately strong earthquakes without seismogenic tectonics Potential seismic source.

MICROSTRUCTURAL FEATURES OF DUCTILE SHEAR ZONE ON THE NORTHERN MARGIN OF HOHXIL,QING-HAI PROVINCE,china

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Scientia Geologica Sinica 1997年第1期 63-69页

作者： Bian Qiantao ( institute of geology, Chinese Academy of Sciences, Beijing {2. Lin Chuanyong and Shi Lanbin institute of geology, state seismological bureau, Beijing {2.

ＭＩＣＲＯＳＴＲＵＣＴＵＲＡＬＦＥＡＴＵＲＥＳＯＦＤＵＣＴＩＬＥＳＨＥＡＺＯＮＥＯＮＴＨＥＮＯＲＴＨＥＲＮＭＡＲＧＩＮＯＦＨＯＨＸＩＬ，ＱＩＮＧ－ＨＡＩＰＲＯＶＩＮＣＥ，ＣＨＩＮＡTXＭＩＣＲＯＳＴＲＵＣＴＵＲＡＬＦＥ...

ＭＩＣＲＯＳＴＲＵＣＴＵＲＡＬＦＥＡＴＵＲＥＳＯＦＤＵＣＴＩＬＥＳＨＥＡＺＯＮＥＯＮＴＨＥＮＯＲＴＨＥＲＮＭＡＲＧＩＮＯＦＨＯＨＸＩＬ，ＱＩＮＧ－ＨＡＩＰＲＯＶＩＮＣＥ，ＣＨＩＮＡTXＭＩＣＲＯＳＴＲＵＣＴＵＲＡＬＦＥＡＴＵＲＥＳＯＦＤＵＣＴＩＬＥＳＨ...

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Estimation of Potential Risk of Reservoir-Induced Earthquake for the Proposed Hydroelectric Project on the Yangtze Gorges

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Earthquake Research in china 1995年第4期9卷 42-51页

作者： Hu Yuliang,Zhao Meng,Hu Ping,Ma Wentao,Yang Qingyuan,and Chen Xiancheng institute of geology,{2. seismological bureau,Beijing 10002.,{6.

The proposed hydroelectric project on the Yangtze Gorges will be one of the largest power stations in the *** problem of induced seismicity to the project has attracted much attention throughout china and the world.A research program has been carried out by the state seismological bureau of *** on the size of the reservoir and the lithology,geological structure,permeability,stress {2.,and previous seismicity in the region,the potential risk of reservoir-induced seismicity has been *** results suggest that,after impoundment in the reservoir area,the possibility of induced seismicity cannot be completely ruled *** areas with potential risk may be in some gorges composed of karstified carbonate and plutonic granite around the dam ***,the magnitude is expected to be limited owing to the small dimension of the induced seismogenic faults.

关键词： seismic risk evaluation reservoir earthquake Yangtze Gorge project