Geochemistry of Ore Fluids and Rb-Sr Isotopic Dating for the Wulong Gold Deposit in Liaoning, China   总被引：3，自引：0，他引：3  

WEI Junhao  QIU Xiaoping  GUO Dazhao  TAN Wenjuan Faculty of Earth Resources  Chinese University of Geosciences  Wuhan  Hubei  Institute of Geology  Chinese Academy of Geological Sciences  Beijing 《《地质学报》英文版》2004,78(6):1267-1274

On the basis of detailed geological studies of the Wulong gold deposit, three metallogenic stages can be identified. With quartz fluid inclusions as an object of study, the authors investigated phase characteristics, compositional variations, temperature and pressure changes, fluid evolution, Pb isotope tracing and Rb-Sr isotopic dating of fluid inclusions entrapped in the above three metallogenic stages. The results show that Na+ is decreased obviously with metallogenic evolution, while K+ and other cations and gas compositions (H2, CO, CH4 and CO2) are increased slightly, and that the temperature and salinity vary in a pulsating manner along with the metallogenic evolution. Inverse calculation of hydrogen and oxygen isotopes indicate that at the first metallogenic stage the fluids were magmatic water, at the second stage they were dominated by magmatic water with a minor amount of meteoric water involved, and at the third stage, i.e., the final stage of metallogenesis, the fluids were composed complete  相似文献   

当代生物多样性剧减与古-中生代之交生物绝灭的对比   总被引：1，自引：0，他引：1  

何卫红  殷鸿福  盛桂莲  周修高 《地球科学》2004,29(3):263-268,316

18世纪以来人类活动对环境造成了强烈破坏,给生物多样性带来了巨大损失.为了了解生物多样性的变化趋势,利用"绝灭物种统计法"、"种-区曲线法"和化石记录对400年以来的生物多样性和古-中生代之交的生物绝灭进行了分析.当代生物多样性剧减表现为物种的快速绝灭(从8×104种/Ma增大到1.2×106种/Ma),而属的绝灭几乎为0;古-中生代之交生物绝灭的初始阶段也表现为物种的快速绝灭(从40种/Ma增大到150种/Ma),并且这个阶段的属的绝灭速率远低于绝灭高峰阶段的相应值(即66属/Ma远小于465属/Ma),可见当代生物多样性剧减相当于二叠-三叠系之交生物绝灭的初始阶段.  相似文献   

累托石制备润滑脂的初步研究   总被引：6，自引：0，他引：6  

黄焱球  高广立 《矿物岩石》1999,19(1):88-91

累托石是一种具有独特的结构组成和性质的粘土矿物,其既具有象蒙脱石一样的阳离子交换性,吸水膨胀性,制浆性等,又具有象云母一样的耐高温性和光滑性等性能。经提纯和有机改性后的累托石吸油速度快,膨胀率高,是一种较好的稠化剂,用它制备的润滑脂滴点〉６３３．１５Ｋ,远高于膨润土润滑脂的指标要求,研究表明,累托石是制备润肖脂稠化剂的好原料,累托石润滑脂是一种新型高温润滑脂。  相似文献   

PTtD Path and Fluid Evolution of HighPressure Eclogites from the Dabie Mountains,Central East China     

ZHANG Zeming Institute of Geology  Chinese Academy of Geological Sciences  Beijing  China WEI Bize HAN Yujing YOU Zhendong China University of Geosciences  Wuhan  China 《Continental Dynamics》1999,(1)

１．Ｉｎｔｒｏｄｕｃｔｉｏｎ　ＴｈｅＱｉｎｌｉｎｇＤａｂｉｅｏｒｏｇｅｎｉｃｂｅｌｔｗａｓｆｏｒｍｅｄｂｙｃｏｌｌｉｓｉｏｎｂｅｔｗｅｅｎｔｈｅＮｏｒｔｈＣｈｉｎａａｎｄＹａｎｇｔｚｅｂｌｏｃｋｓ．Ｔｈｅｃｏｒｅｐａｒｔｏｆｔｈｅｏｒｏｇｅｎｉｃｂｅｌｔｃｏｎｓｉｓｔｓｏｆｓｅｖｅｒａｌｍｅｔａｍｏｒｐｈｉｃｒｏｃｋｇｒｏｕｐｓ,ｉｎｃｌｕｄｉｎｇｔｈｅＤａｂｉｅ（Ｔｏｎｇｂａｉ）ｃｏｍｐｌｅｘ,Ｈｏｎｇ’ａｎ（Ｓｕｓｏｎｇ）ｇｒｏｕｐ,ＳｕｊｉａｈｅｇｒｏｕｐａｎｄＳｕｉｘｉａｎ（Ｙａｏ…  相似文献   

东营凹陷下第三系层序地层格架及盆地充填模式     

Feng Youliang 《地球科学》1999

  相似文献   

Geospatial Information Service Based on Digital Measurable Image——Take Image City·Wuhan as an Example   总被引：1，自引：0，他引：1  

LI Deren  SHEN Xin State Key Laboratory of Information Engineering in Surveying  Mapping  Remote Sensing  Wuhan University  Luoyu Road  Wuhan  China 《地球空间信息科学学报》2010,(2)

LBS (location-based service) is a remarkable outcome of the development from GIS to geospatial information service. Faced by the requirements of geospatial information from the masses and the opportunity provided by the next generation Internet and Web 2.0, a new model of geospatial information service based on DMI (digital measurable image) is presented. First, the concept of LBS and the opportunities of Web 2.0 are introduced, then the characteristic of DMI is discussed. Taking the Image City·Wuhan as an ...  相似文献   

Simulation of Stress Distribution around Tunnels and Interaction between Tunnels Using an Elasto–plastic Model     

Muya M S  何波  王靖涛  李国成 《中国地质大学学报(英文版)》2007,(1)

This article presents a computer simulation of stress distribution around tunnels and interaction between tunnels using an elasto-plastic model. A finite element method using ANSYS software has been used for the analyses of one and two tunnels at different overburden depths with different separating distances between the tunnels. The results of numerical analyses indicate that stress distribution and stress concentration around the tunnels vary with the overburden depths. It is found that the coefficients of stress concentration for elasto-plastic medium are smaller than those for elastic one by 1.9%. Furthermore, the interaction between the two tunnels rapidly decreases with the increase of separation distance between them. In addition, for quantitatively describing the interaction between the two tunnels, a critical separation distance is introduced. The critical separation distances between the two tunnels at different overburden depths are 8 m, 12 m, and 14 m respectively. This fact is very important and essential for the design of mining tunnels and to ensure safety in tunnel engineering.  相似文献   

A Review on the Global Stratotype Section and Point of the Permian-Triassic Boundary   总被引：6，自引：0，他引：6  

YIN Hongfu  TONG Jinnan  ZHANG Kexin Lab of Biological  Environmental Geology  China University of Geosciences  Wuhan  Hubei  State Key Lab of Geological Process  Mineral Resources  China University of Geosciences  Wuhan  Hubei 《《地质学报》英文版》2005,79(6):715-728

1 Introduction The Global Stratotype Section and Point (GSSP) of the Permian-Triassic Boundary (PTB) has been ratified by IUGS in 2001 (Yin et al., 2001). It is defined at the base of the Hindeodus parvus horizon, i.e. the base of Bed 27c of Meishan Section D, Changxing County, Zhejiang Province, South China. The PTB is important because it is not only an erathem boundary but also a great turning point of geological history symbolized by profound global changes and the strongest …  相似文献   

基于多尺度边缘约束的重力场信号的向下延拓   总被引：27，自引：9，他引：18       下载免费PDF全文

宁津生  汪海洪  罗志才 《地球物理学报》2005,48(1):63-68

利用多尺度边缘检测理论,研究改善重力场信号向下延拓稳定性的新方法,简要介绍了小波多尺度边缘检测的基本原理,以EGM96重力场模型为例分析了地球重力场的多尺边缘。提出了基于多尺度边缘约束的向下延拓方法,并给出了模拟算例。计算结果表明,利用多尺度边缘约束改善向下延拓的稳定性是可行的,在观测值信噪比较差的情况下该方法的效果尤为明显。  相似文献   

基于树形结构的地震数据库系统设计方法   总被引：2，自引：0，他引：2       下载免费PDF全文

王喜珍  滕云田  高孟潭  陈步云  姜慧 《地震学报》2005,27(1):96-101

地震观测数据的大量增长给数据管理提出了新的要求. 本文将树形结构引入到数据库设计中, 提出了基于树形结构设计关系数据库的方法. 该方法简单、 直观、 易于数据的组织, 可以简化数据库的设计过程. 在ldquo;长江三峡工程诱发地震监测系统地震监测总站数据库rdquo;设计中应用了该方法, 并取得了良好的效果.   相似文献