玄武岩类岩石大地构造环境的Th、Nb、Zr判别   总被引：53，自引：0，他引：53  

孙书勤  汪云亮等 《地质论评》2003,49(1):40-47

本文通过研究Th、Nb、Zr的地球化学性质和判别机理，根据世界上典型大地构造环境区玄武岩类的Th、Nb、Zr数据，研究了Th、Nb、Zr判别玄武岩大地构造环境的地球化学机理，发现大同构造环境区玄武岩系的Th、Nb、Zr特征具有显著差异，其比值特征能将玄武岩形成的大地构造位置很好地划分出来，提出了判别玄武岩大地构造环境的Nb/Zr-Th/Zr双对数判别图，试图能较好地区分出大洋板块发散边缘，板块汇聚边缘，大洋板内，大陆板内及地幔热柱形成的玄武岩，得出了玄武岩大地构造环境判别的标志，指出了用Th、Nb、Zr判别玄武岩大地构造环境的方法。  相似文献   

鲁中寒武系馒头组震积岩的发现及初步研究   总被引：25，自引：4，他引：25  

田洪水万中杰  王华林 《地质论评》2003,49(2):123-131

近几年在鲁中不同地区发现馒头组石店段中均有震积岩产出。震积岩形成于干燥的潮坪泻湖环境，发育在下寒武统的上部。它们具有记录强地震事件的泄水构造（地震成因泥晶脉）、液化卷曲变形、阶梯状小断裂、层内错断和液化网状裂纹等层内构造的特征。本文通过地层综合对比，论证了不同地区震积岩的等时性。认为：鲁中早寒武世末有一个地震活跃期；地震序列属乔秀夫（1994，2001a)提出的碳酸盐岩振动液化地震序列的原地系统；震积岩分布范围是约在510Ma前，以古郯庐带为震中的强地震之7－11度烈度区。为区别于张增奇（1996）提出的鲁中新元古代石旺庄期地震事件层，将此地震成因地层名之为馒头期地震事件层。  相似文献   

Geochemistry, Geochronology and Genesis of Gold Mineralization in Nurt of Northern Altay, Xinjiang: A Case Study on the Aketishikan Gold Deposit   总被引：1，自引：0，他引：1  

YUAN Feng  ZHOU Taof  TAN Lugui  LUO Xianrong  YUE Shucang School of Resources  Environment Engineering  Hefei University of Technology  Hefei  Anhui 《《地质学报》英文版》2004,78(2)

Gold deposits such as the Aketishikan, Togetobie, Tasbig-Kokeydlas, Kums and Hongshanzui gold deposits in the Nurt area in Altay of Xinjiang were found in Member 3 rhyolite tufflava, fragmental lava and ignimbrite of the Carboniferous Hongshanzui Group. Trace and rare earth elements, sulfur, lead, oxygen and hydrogen isotopes, and geochronological studies indicate that the ore-forming material was mostly supplied by the Carboniferous volcanic rocks through water-rock interaction under a low-to-moderate temperature, and the hydrothermal ore-forming fluid came from meteoric water with some magmatic water input evolved from the granitic magmas. Gold deposits in the Nurt area as well as in the northern Altay might form in multiple stages, and the Yanshanian mineralization period should be paid more attention besides the Variscan mineralization period.  相似文献   

生态足迹理论在区域可持续发展评价中的应用及改进   总被引：59，自引：1，他引：59  

熊德国  鲜学福  姜永东 《地理科学进展》2003,22(6):618-626

综述了生态足迹理论及其在全球及区域可持续发展系统中的应用成果,发现生态足迹理论在用于区域可持续发展评价时遇到了困难,主要表现为其对区域发展可持续性的评价结果与可持续发展理论所阐述的基本原则不一致,认为这主要是将基于全球生态系统的生态足迹理论不适当地用在了区域可持续发展系统所导致的,而根本的原因是生态足迹概念本身的定义不够确切。本文将生态足迹区分为消费性生态足迹和生产性生态足迹,对传统的生态足迹理论进行改进,并以生产性生态足迹作为评价区域可持续发展的指标,以期更真实地反映区域发展的可持续性;通过比较全球生态赤字和区域人均消费性生态赤字可以对区域发展公平性做出评价。  相似文献   

The Grouping of the Strike-Slip Offset Data and Its Relation With the Seismicity Along Middle Segment of the Xiaojiang Active Fault     

Shen Jun  Wang Yipeng  Song Fangmin  Yu Weixian  Cao Zhongquan  Shen Xuhui  Hou Xueying  and Li ZhixiangInstitute of Geology  SSB  Beijing  ChinaInstitute of Earthquake Engineering  Seismological Bureau of Yunnan Province  Kunming  China 《中国地震研究》1998,(2)

The data of the strike-slip offset along the Xiaojiang active fault can be obviously grouped.The groups of small orders of magnitude data within 100 m show clear linear characteristics of increments between 8 m and 12 m,which indicates that the segments of the Xiaojiang active fault is of characteristic seismicity and the distribution of the values of each group indicates that there are smaller earthquakes and creep between two large earthquakes along each segment of the Xiaojiang active fault.The interval between two characteristic large earthquakes can be calculated with the increments for two groups of slip data and the slip rate of the fault.Furthermore,the frequency of smaller earthquakes can also be estimated by comparing the distributions of the displacements of the large earthquakes with the distributions of the values of each group of data.The groups of large slip displacements show that there is close relationship between the records of the displacements of the fault and the changes of the cli  相似文献   

A NEW APPROACH TO THE DESIGN OF A SYSTEM FOR FEATURE EXTRACTION BASED ON HUMAN-COMPUTER COLLABORATIVE TACTIC     

TAO Chuang LIN ZongjianTAO Chuang  Doctoral Candidate  School of Information Engineering  WTUSM  Wuhan  China   《地球空间信息科学学报》1998,(1)

We are involved in an embarrassing situation that the limited capa-bility of automated feature extraction in digital photogrammetric systems cannotsatisfy the increasing needs for rapid acquisition of semantic information for appli-cations.Facing this challenge,a new tactic,Human-Computer Collaborative（HCC）tactic,and a corresponding new method,Operator-Object Directed（OOD）method,are proposed for the design of a system for feature extractionfrom large scale aerial images.We hold that in almost all technical complex sys-tems,full automation will be neither technically feasible nor socially acceptable.The system should be designed to optimize through the cooperative operation withtwo agents in the system:the human and the computer.  相似文献   

A MORE GENERAL FORM OF ERROR DISTRIBUTION     

SUN Haiyan  Doctoral Candidate  School of Geo-sci-ence  Surveying Engineering  WTUSM  Wuhan  China   《地球空间信息科学学报》1998,(1)

This paper deduced a more general error distribution,the p-th pow-er norm distribution,based on the foundational properties of random errors.  相似文献   

OUTLIER DETECTION AND RELIABILITY OF ADJUSTMENT MODELS WITH SINGULAR COVARIANCE MATRICES     

WANG JinlingCHENG YongqiTAO BenzaoWANG Jinling  lecturer  school of Geo-science  Surveying Engineering  WTUSM  Wuhan  China   《地球空间信息科学学报》1998,(1)

Up to now,outlier detection and reliability theory are generallybased on the regular Gauss-Markov models,in which the covariance matrix of ob-servations is positively definite.For the adjustment models with singular covari-ance matrix,the statistics for outlier detection are derived by the authors.Thecorresponding reliability theory is developed.And the application of the theory isdemonstrated with a practical example.  相似文献   

Elemental Geochemical Anomaly in the Sinian Doushantuo Formation-Dengying FormationBoundary in Miaohe, Hubei     

YANG Jian Southwest Institute of Technology  Mianyang  Sichuan  DING Lianfang Xi''an Engineering University  Xi''an  Shaanxi 《《地质学报》英文版》1998,72(2):198-206

No research has been made on such a lower rank boundary as the Sinian Doushantuo Formation-Dengying Formation boundary in the eastern region of the Yangtze Gorges. Elemental geochemical determination has revealed anomalies of REE and other trace elements around the boundary, which have relatively high contents than those in its overlying and underlying beds. The authors therefore think that a catastrophic event once occurred in the Miaohe area at the end of the Doushantuoan Period, which caused the mass extinction of the Miaohe biota.  相似文献   

污染检测试井新图版及其应用     

冯文光 《矿物岩石》1998,18(3):58-62

本研究提出了考虑续流和污染类似于麦金利图版的新图版。这种新图版既适用于压降试井,又适用于压力恢复试井;既适用于具有高传导的垂直裂缝试井,又适用于致密低渗透储层试井分析;既适用于单一介质,又适用于双重介质。  相似文献