Middle Yangtze sea-basin over Paleozoic-Mesozoic transition     

Dinghua Huang  Yichun Duan  Bin Li  Lingqing Yao  Heng Zhang  Fan Zhang  Junhui Wang  Hao Guo  Hongfu Yin 《中国科学D辑(英文版)》2002,45(8):730-740

On the centimeter scale of lithologic change, we conduct poly-statistic analysis on the sedimentary behavior and dynamic features of the stratigraphic sequence from upper Dalong formation to lower Daye formation, which across the Permian-Triassic boundary in East Hubei. From the perspective of stochastically dynamic system, the depositional process of upper Dalong formation can be regarded as a stable Markovian process with weakly stratigraphie correlation and randomly lithologic alteration. Compared to it, the depositional process of lower Daye formation was unstable Markovian process with much closer stratigraphic correlation and ordered lithologic change. As for the replacement style of the sedimental cycle, the former was chaotic, while the latter was periodical. Otherwise, although the overall depositional process of the two formations was continuous, their dynamic characteristics were obviously different. So this P-T sedimental boundary can also be regarded as a dynamic limit. It was a kind of depositional reaction in response to a catastrophic alteration when the geological environment was in continuous change but came over a certain threshold state.  相似文献   

利用声谱分析方法对岩石破碎过程的研究——俄罗斯钻探过程研究的新方向   总被引：2，自引：0，他引：2  

汤凤林  段隆臣 《地质科技情报》2001,20(4):103-106

介绍了俄罗斯采用声谱分析方法研究岩破碎过程和钻探规程的情况和结果，讨论了岩石破碎与声波的关系，说明了钻进时如何测量声波，分析了孔底功率，碎岩声波和钻头胎体温度与钻探工况（抛光，正常钻进，烧钻）的关系。  相似文献   

C1相干算法及其在三维地震勘探解释中的应用   总被引：4，自引：0，他引：4  

闫德庆  庞留彦  仲其涛  李晋平  宋端智 《物探化探计算技术》2001,23(3):206-209,271

作者在文中详细讨论了二维和三维C1相干算法，根据三维C1相干算法的特点，结合二维地震数据体的特点，考虑到三维地震勘探在各大矿区的全面普及，针对三维地震资料开发出了一套实用的应用程序进行相干处理和解释，通过对实际三维地震资料的处理，分析结果表明，C1相干技术对三维地震资料的构造，岩性解释有明显的效果。  相似文献   

High-Frequency Sequence Stratigraphy Using Syntactic Methods and Clustering Applied to the Upper Limestone Coal Group (Pendleian, E1) of the Kincardine Basin, United Kingdom     

Taizhong Duan  Cedric M. Griffiths  Sverre O. Johnsen 《Mathematical Geology》2001,33(7):825-844

We define a distance between sedimentary successions to compare their dissimilarity formally. Distance definition is based on attributed syntactic representation. One-dimensional successions can be represented by a string of lithofacies symbols sequentially or vertically. Each symbol can also have a vector of attributes that can provide other information on lithofacies such as thickness. The distance of any two successions is then defined consisting of its syntactic and attribute subdistances. Syntactic distance measures difference of vertical lithofacies change between two successions and attribute distance measures difference of thickness of corresponding lithofacies. Clustering is used to test validity of distance definition and its potential application to analysis of cycle-dominated sedimentary successions. Example is from the Namurian-A succession in Kincardine basin, central Scotland. There are 56 cycles in intervals of about 300 m each in two boreholes. Recognition of intermediate cycles depends on correctly determining of types of these short cycles and their vertical stacking pattern. Intermediate cycles have better potential in high-resolution stratal correlation regionally. Syntactic clustering results show that 56 short cycles can be classified into four groups with distinctive geological interpretation, which further helps reveal hierarchical cyclic architecture of the whole succession.  相似文献   

云南降水正态分布特征的初探   总被引：7，自引：0，他引：7       下载免费PDF全文

陶云  段旭 《气象科学》2003,23(2):161-167

利用适合性检验方法，对云南省125个测站1961年一2000年40a逐月降水资料是否符合正态分布进行了检验，并对云南降水正态分布做了区划。研究结果表明，云南在雨季(5—10月)通过显著性检验的测站数明显少于干季(11一次年4月)通过显著性检验的测站数，其中8月份仅4站次通过显著性检验，而12月份高达97站次，占全省总站次的77．6％；即云南雨季降水多符合正态分布，而在于季多符合非正态分布，8月份几乎全省符合正态分布，而12月份大部份测站都不符合正态分布。云南降水量的正态统计分布一方面具有一定的区域性特征，另一方面又具有较强的局地性，不同的月份同一测站降水量的正态性不同。因此，在做有关降水量的分析预报时，很有必要考虑其正态性的统计分布特征。  相似文献   

对东亚夏季风与西北太平洋热带气旋频数关系的初步分析   总被引：27，自引：1，他引：27       下载免费PDF全文

孙秀荣  端义宏 《大气科学》2003,27(1):67-74

利用海陆热力差指数(ILSTD)、500 hPa位势高度场、向外长波辐射(OLR)资料及NCEP/NCAR月平均再分析数据集,分析东亚夏季风与西北太平洋地区(包括中国南海)热带气旋频数的关系,结果表明,在强夏季风年西北太平洋地区热带气旋频数偏多,而弱夏季风年同期热带气旋频数异常偏少而后期趋于正常,正常夏季风年热带气旋频数基本正常.并结合热带气旋形成的大尺度环流条件,对其动力机制作了初步探讨.  相似文献   

浙北富阳神功村二长花岗斑岩脉SHRIMP锆石U—Pb年龄及其地质意义   总被引：1，自引：0，他引：1  

王剑  包超民  高永华  李忠雄  T.Z.Duan 《地质通报》2003,22(9):729-732

浙北富阳神功村地区二长花岗斑岩脉侵入于中新元古界地层中,采自该岩脉样品的锆石离子探针(SHRIMP)U-Pb同位素年龄为117.7Ma±2.7Ma。这一数据表明本区二长花岗斑岩岩脉的形成年代为早白垩世中期,而不是1∶5万填图资料所认为的新元古代时期(晋宁晚期)。新获得的高精度年龄数据支持华南中生代末广泛的岩浆侵入作用始于早白垩世中期的观点。  相似文献   

娘子关泉群岩溶水系统西部子系统径流特征研究   总被引：1，自引：1，他引：1  

韩东亮周新河  段俭君 《中国煤田地质》2003,15(5):26-28

根据娘子关泉群系统西部控水构造、含水层段、水动力场等水文地质条件，重新划定了娘子关岩溶水系统西部边界(兴道-大方山-郭家沟-线构造带)，则东山区成为娘子关的一个补给径流区。在此基础上，对西部子系统岩溶水径流特征提出了新的见解。  相似文献   

Carbonate Platform Margin Slope Characteristics of Cambrian Chefu Age in Baojing-Fenghuang and Adjacent Areas, Western Hunan, China     

DuanYe LiJie LinQixiang 《中国地质大学学报(英文版)》2003,14(1):16-24

The Cambrian paleogeography in south China can be divided into Yangtze platform, plat-form margin slope (including upper slope and lower slope) and basin. The carbonate gravity deposits are well developed there, particularly in the Yangtze platform adjacent areas. This paper mainly deals with declivity fan characters of the Chefu age in Fenghuang acUacent areas, western Hunan Province. Accord-ing to their distribution and thickness, three main declivity fans have been divided in the study areas,namely, Dama ( ∈ c-dsf), Machong ( ∈ c-msf) and Huangheymm ( ∈ c-hsf) declivity fans. Each fan‘s characters are described in detail in this paper. Based on their distribution range, scale and fossiliferous layers, two peak periods (fair developmental period) are distinguished: (1) Linguagnostus reconditus Zone (time), and (2) Glyptagnostus reticulatus Zone (time). They were characterized by huge thickl imestone breccia layers (single layer 3--4 in thick) and dosely spaced spread. Besides, there are also two develolmaental periods: (1) Lej op yge laevigata- Proagnostus bulbus Zone (time), and (2) Agnos-ms inexpeetans-Proceratopyge protracta Zone (time) to Erixanium Zone (time) to Corynexochus plumula-Sinoproceratopyge cf. kiangshanensis Zone (time), while Glyptagnostus stolidotus Zone (time) was an interstitial period (without or rare limestone breccias). All these features may verify the relative movement of the earth crust and paleodimate variety of the Chefu age in the study areas.  相似文献   

Study on basement structures of the northeast Pamirs     

段永红  张先康  杨卓欣 《地震学报(英文版)》2002,15(4):395-401

1 Geologic setting and layout of the DSS observation network In the studied area there are three major tectonic units, which are referred to as Tianshan fold system, Tarim basin and West Kunlun fold system (Bureau of Geology and Mineral Resources of Xinjiang Uygur Autonomous Region, 1993). The Tianshan fold system is a polycyclic geosyncline on the north edge of Tarim basin, and an orogenic zone resulting from collision and convergence between Tarim block and the Junggar-North Tianshan…  相似文献