润扬长江公路大桥三维地质分析     

方海东  施斌  吴振君 《上海国土资源》2001,(Z1):39-42

该文从三维地质建模的概念出发,探讨了其一般过程,包括地质变量预测、地质特征解译、空间分析等,并介绍了三维地质建模的体视化方法,最后以润扬长江公路大桥工程为例,运用切片级重建方法,建立地质模型,并进行了三维地质分析.实践表明,三维地质建模技术是认识复杂地质体的空间关系和特征的强有力的工具,具有广阔的应用前景.  相似文献   

Devonian Frasnian-Famennian Transitional Milankovitch Cycles and High-Resolution Stratigraphic Correlation     

GONG Yiming Faculty of Earth Science  China University of Geosciences  Wuhan  LI Baohua Laboratory of Marine Geology  Tongji University  Shanghai  WU Yi Guangxi Institute of Geology  Nanning 《《地质学报》英文版》2001,75(4):354-363

Four hierarchical cyclothems, superbundlesets, bundlesets, bundles and laminae, have been identified from the Devonian Frasnian-Famennian carbonate strata in Guangxi, South China. Their hierarchical structures, ratio relationships and sequence in conodont zones are continuous and stable and can be traced across different facies zones and sedimentary basins. Our data show that hierarchically organized superbundlesets, bundlesets, bundles and laminae correspond to the long eccentricity, eccentricity, obliquity or precession and sub-Milankovitch cycles respectively. Their periods were 400,000, 100,000, 33,333, 16,667 and 8,000-17,000 a, respectively. The ratios of long eccentricity to eccentricity, eccentricity to obliquity, and eccentricity to precession in the Devonian are 1:4, 1:3 and 1:6 respectively. Using these hierarchical Milankovitch cyclothems, chronostratigraphical division and correlation can be realized at a resolution of 100 ka or 10 ka at the Frasnian-Famennian transition. The time intervals  相似文献   

Indosinian Foreland Fold-and-Thrust Belt Bordering Yunnan and Guangxi, China   总被引：2，自引：0，他引：2  

WU Genyao Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing 《《地质学报》英文版》2001,75(4):391-397

Recent discoveries of ophiolites indicate that there must be a Palaeotethyan geosuture zone bordering China and Vietnam, which separates the Vietbac block from the South China subcontinent. The Indosinian foreland fold-and-thrust belt bordering Yunnan and Guangxi provided further evidence for the palaeotethysides. The oceanic crust was subducted southwestwards while the magmatic arc migrated northeastwards, and the continent-arc collision occurred in the Late Triassic with the thrusting being extended towards the north or northeast. The features of thrust-nappe structure are discussed, which proved the continental margin of the Palaeotethyan ocean there to be a complicated one. A face-to-face collision occurred first along the NW-striking segment and then along the ENE-striking segment accompanied by transpression or oblique thrusting occurring along the NW-striking one.  相似文献   

New Data of Daomanite and Hongshiite     

YU Zuxiang Institute of Geology  Chinese Academy of Geological Sciences  Beijing Fei Zhenbi 《《地质学报》英文版》2001,75(4):458-466

In 1974 the author preliminarily reported two new platinum group minerals-daomanite and hongshiite. The two minerals were accepted by the Commission on New Minerals and Minerals Names of the International Mineralogical Association in 1976 and 1982 respectively. Because of the conditions at that time, the work was preliminary, for example, there were only reflectance values of four wave bands. Recently the author again made measurements of reflectances, corrected cell parameters by the four-circle diffractometer and electron diffraction and supplemented their new occurrences and nomenclature.  相似文献   

Geochemical Characteristics of the Cenozoic Volcanic Rocks in Central Qiangtang, Tibet: Relation with the Uplift of the Qinghai Tibet Plateau     

TAN Fuwen  PAN Guitang  XU Qiang Chengdu Institute of Geology  Mineral Resources  Chengdu 《Continental Dynamics》2001,(1)

1. Introduction The uplift and evolution of the Qinghai Tibet Plateau has been the most important projects for studying the dynamic process of the plateau, and the uplift mechanism and history are the essential problems. Researches have been done extensively in terms of tectonics, sedimentology, geophysics, paleontology, paleoclimate and paleomagnetism for several tens of years. Many evolution models have been suggested but so far none of them have been explained perfectly. In recent years,…  相似文献   

A New Intergrowth Consisting of FeO and SiO_2 Phases from Lower Mantle   总被引：2，自引：0，他引：2  

BAI Wenji  Tao Shufeng  SHI Rendeng  YANG Jingsui  FANG Qingsong  YAN Binggang  ZHANG Zhongming Institute of Geology  CAGS  Beijing  China  Beijing General Research Institute of Mining & Metallurgy  China 《Continental Dynamics》2001,(2)

1. IntroductionIn order to confirm the presence or absence of diamonds in the Luobusa ophiolitic chromitite in Tibet, about 1500 kg chromitite sample was collected for separating its associated minerals, in which diamond, moissanite, octahedral pseudomorphic serpentine and chlorite, native silicon, native chromium, some alloys and other minerals were found. A wide variety of minerals, including about 70-80 types of mantle minerals from the Luobusa ophiolite, were identified by energy dispersi…  相似文献   

大别超高压榴辉岩高温高压下电导率实验研究   总被引：7，自引：0，他引：7  

朱茂旭  谢鸿森  赵志丹  郭捷  白武明 《地球物理学报》2001,44(1):93-102

为研究大陆中下地壳高导层成因及与物质组成之间的关系，用模拟实验的方法在不同的温度、压力条件下分别测定了干的和1mol/LNaCl溶液饱和的榴辉岩的电导率.结果表明，干榴辉岩平行线理方向的电导率比垂直于线理方向的高，但两个方向上的活化能相近.在中下地壳条件下，干榴辉岩的电导率比中下地壳高导层电导率值低几个数量级.常温下1mol/LNaCl溶液饱和的榴辉岩两个方向上的电导率对压力具有不同的依赖性；在中下地壳条件下，1mol/LNaCl溶液饱和的榴辉岩的电导率可达到一般高导层的电导率值.无论干的还是饱和的榴辉岩都不能解释大别山20-50km深处的高导层成因，因此，在该深度范围内榴辉岩不可能是主要的岩石组成.  相似文献   

二连盆地巴音都兰凹陷早白垩世构造岩相带特征及含油性   总被引：6，自引：4，他引：6       下载免费PDF全文

崔周旗  吴健平  李莉  王海潮 《古地理学报》2001,3(1):25-34

在系统观察岩心的基础上，从单井相分析入手，结合地震相和测井相模式，以及大量岩矿、粒度等分析化验资料，对巴音都兰凹陷下白垩统巴彦花群的物源方向、沉积体系、构造岩相带及含油性进行了研究。认为区内具有东、西两大物源区、五大水系控制着十一个砂体的平面展布，最终，划分了扇三角洲等五种沉积体系，总结出具平台型陡坡扇三角洲等六种构造岩相带，并着重对有别于典型单断箕状凹陷的三种构造岩相带的含油性进行了初步探讨。  相似文献   

新矿物——铊明矾   总被引：9，自引：1，他引：9  

陈代演  王冠鑫  邹振西  陈郁明 《矿物学报》2001,21(3):271-277

铊明矾 (lanmuchangite ,TlAl[SO4]2 ·12H2 O)是在贵州滥木厂铊 (汞 )矿床富铊矿体氧化带中发现的一种铊的硫酸盐新矿物。该矿物为产于氧化带的次生矿物 ,其共生矿物为水绿矾、镁铝矾、钾明矾、黄钾铁矾、石膏、自然硫、砷华及某些未知矿物。其矿物集合体大小一般为 2～ 10mm ,集合体多为致密块状 ,单晶呈他形粒状 ,4 0～ 90 μm ,偶见平行柱状集合体 ,半自形至自形柱状晶体 ,直径 15～ 65 μm。白色至淡黄色 ,玻璃光泽 ,透明 ,易溶于水。偏光显微镜下无色 ,均质体 ,实测折光率为 1.4 95。维氏硬度为 94～ 12 4kg/mm2 ,摩氏硬度为 3 .1～ 3 .4 ,实测密度 2 .2 2 g/cm3。平均化学成分 :Tl2 O =3 3 .2 5 % ,Al2 O3=8.0 7% ,SO3=2 5 .19% ,SiO2=0 .10 % ,K2 O =0 .3 5 % ,CaO =0 .0 8% ,MgO =0 .0 6% ,FeO =0 .0 4 % ,H2 O =3 3 .4 6% ,总和 10 0 .60 % ,除结晶水由热重分析 (TG)求得 ( 3件样品平均 )外 ,其余成分均由电子探针分析 ( 6点平均 )求得。化学式为(Tl1.0 0 K0 .0 5) 1.0 5(Al1.0 1Si0 .0 2 Ca0 .0 1Mg0 .0 1Fe0 .0 1) 1.0 6 [SO4]2 .0 2 ·11.86H2 O ,理论式为TlAl[SO4]2 ·12H2 O。X射线粉末衍射主要强线 [d(I,hkl) ]为 :0 .4 3 14 ( 10 0 ,2 2 0 ) ,0 .2 80 1( 70 ,3 3 1) ,0 .70 3 ( 5 4 ,1  相似文献   

鄂尔多斯地区晚古生代陆相沉积层序地层学研究   总被引：4，自引：0，他引：4  

侯中健  陈洪德  田景春  刘文均  张锦泉 《矿物岩石》2001,21(3):114-123

鄂尔多斯地区晚古生代陆相沉积占据了较长的时期，基于现代沉积学理论和层序地层学思想，本文从鄂尔多斯地区晚古生代沉积盆地的沉积特点出发，建立一套比较切合实际的层序地层划分方案，研究了该区晚古生代陆相沉积层序地层学，比较客观地反映了盆地沉积作用和构造演化历史。  相似文献