湖南有色金属生产矿山扩大接替资源的对策     

戴塔根 《地质通报》2005,(Z1)

湖南省境内有色金属矿产十分丰富,享有“有色金属之乡”的美誉,但经过多年的开采,90%以上的矿山都面临储量危机的困难,而找矿难度日益增大,常规的找矿技术路线已很难打开找矿效果不佳的局面。因此,在找矿预测过程中,必须以新的理论为指导,采用新的思路,从新的成矿与控矿因素、新的矿床成因类型与成矿模式入手,结合有效的常规手段与新技术,进行系统而科学的研究,并深入分析前人已有成果和投入大量现场调查研究工作,才有可能实现储量危机矿山找矿预测的突破。  相似文献   

铜陵凤凰山铜矿区角砾岩特征及其成因分析   总被引：3，自引：0，他引：3  

毛政利  杨斌  赖健清 《矿物岩石》2004,24(1):29-32

凤凰山铜矿区矿体附近不同类型角砾岩的分形统计分析结果表明,其中角砾状花岗闪长岩的形成以化学作用为主,其颗粒大小分布的分维值达到了1．389,说明其在形成过程中经历了机械破裂过程,其破裂过程中的能量达到中等。角砾状矿石和角砾状大理岩均为水力致裂角砾岩,角砾状矿石的颗粒大小分布的分维值(1．526)大于角砾状大理岩(1．24),指示了角砾状矿石形成时的能量大于角砾状大理岩。  相似文献   

风沙流中沙粒浓度分布的实验研究   总被引：9，自引：0，他引：9  

王洪涛  董治宝  张晓航 《地球科学进展》2004,19(5):732-735

利用粒子图像测速技术（PIV）,在风洞内对与天然沙接近的石英沙风沙流沙颗粒浓度沿高度分布进行了研究。对 3种不同轴线风速研究结果表明,风沙流中沙粒浓度沿水平方向基本不变,而随高度呈指数衰减,而且其衰减速率与风速密切相关。风速越大,衰减速率越慢;风速越小,衰减速率越快。风沙运动一旦发生时,靠近沙床表面的沙粒浓度随风速变化很小,可以认为趋于稳定,达到最大值。  相似文献   

Calculation of the Model of Coesite Inclusions and Analysis of Their Retrometamorphic Paths     

MENG Dawei  DING Xiaokun  WU XiulingFaculty of Materials Science  Chemical Engineering  China University ofGeosciences  Wuhan  Hubei Testing Centre  China University of Geosciences  Wuhan  Hubei 《《地质学报》英文版》2004,78(1):166-169

The process and path of retrometamorphism of coesite have great significance to our understanding of the P-T tracks of the exhumation of ultrahigh-pressure metamorphic rocks. Most of the coesites in the eclogite from Shima, Anhui Province, the Dabie Mountains, China, are found degraded to quartz partly or wholly, with ruptures occurring in the shells, outside which include the coesite and quartz. According to the microscopic observation, the sample of coesite inclusion is composed of garnet, quartz and coesite, based on which we have built a three-shelled composite sphere model to compute the transition of coesite. Based on the crystal growth formulas and pressure conditions of the ruptures in the garnet, we have calculated the radius of the quartz sphere, which depends on temperature, and eventually drawn the different retrometamorphic paths for different retrometamorphism rates.  相似文献   

Intracontinental Collisional Orogeny During Late Permian-Middle Triassic in South China: Sedimentary Records of the Shiwandashan Basin   总被引：2，自引：0，他引：2  

LIANG Xinquan  LI Xianhua  QIU Yuanxi Guangzhou Institute of Geochemistry  Chinese Academy of Sciences  Guangzhou  Guangdong Geoscience Department  Zhongshan University  Guangzhou  Guangdong 《《地质学报》英文版》2004,78(3):756-762

Sedimentary response to an orogenic process is important for determining whether South China had compressional or extensional orogeny during the period from the Late Permian to the Middle Triassic besides the tectonic and magmatologic evidence. An intracontinental collision event took place between the Yangtze and Cathaysia blocks in the Late Permian. Beginning at the Late Triassic, the tectonic movement was completely changed in nature and entered a post-collisional extensional orogenic and basin-making process. This paper presents sedimentological evidence from the Late Permian to the Middle Triassic in the Shiwandashan basin at the southwestern end of the junction zone between the Yangtze and Cathaysia blocks.  相似文献   

A Simple Monte Carlo Method for Locating the Three-dimensional Critical Slip Surface of a Slope   总被引：2，自引：0，他引：2  

XIE Mowen Institute of Environmental Systems  Kyushu University  Hakozaki --  Higashi Ku  Fukuok  Japan College of Resource Engineering  the University of Science  Technology Beijing  Xueyuan Ro  Haidian District  Beijing  China 《《地质学报》英文版》2004,78(6):1258-1266

Based on the assumption of the plain-strain problem, various optimization or random search methods have been developed for locating the critical slip surfaces in slope-stability analysis, but none of such methods is applicable to the 3D case. In this paper, a simple Monte Carlo random simulation method is proposed to identify the 3D critical slip surface. Assuming the initial slip to be the lower part of a slip ellipsoid, the 3D critical slip surface is located by means of a minimized 3D safety factor. A column-based 3D slope stability analysis model is used to calculate this factor. In this study, some practical cases of known minimum safety factors and critical slip surfaces in 2D analysis are extended to 3D slope problems to locate the critical slip surfaces. Compared with the 2D result, the resulting 3D critical slip surface has no apparent difference in terms of only cross section, but the associated 3D safety factor is definitely higher.  相似文献   

《地质学报》(英文版)、《地质学报》(中文版)、《地质论评》第40届编委会在京成立     

编辑部 《地质论评》2019,65(1):65010014-65010015

正2018年12月22日,中国地质学会主办的《地质学报》(英文版)、《地质学报》(中文版)和《地质论评》第40届编委会成立大会及进一步提升三刊质量讨论会在北京召开。中国地质学会常务副理事长兼秘书长李金发,三刊主编杨文采院士、侯增谦院士、杨经绥院士,三刊第40届副主编及编委金之钧院士、郝芳院士、李家彪院士等,三刊编辑部编辑以及中国地质学会秘书处工作人员等共120余人出席会议。中国地质学会副理事长兼常务副秘书长朱立新主持了三刊  相似文献   

UPPER PALAEOZOIC FORMATIONS AND FAUNAS OF YAOLING,CHENHSIEN,S.HUNAN.     

朱森 《地质学报》1928,7(1):61-84

STRATIGRAPHY Yao Ling (瑤林) lies 40 li southeast from Chen Hsien city (郴縣), about Long. 112°30′E., Lat. 25°40′N., and is halfway between Chen Hsien city and the well known wolfram mining district, Yao Kang Sien (瑤崗仙). On the  相似文献   

信息科学与矿产预测     

杨中宝  彭省临  银霞  李朝艳 《化工矿产地质》2004,26(1):41-44

矿产预测实质上就是对成矿系统演化过程精确性表达的探索,现代信息科学的发展为理解成矿系统的非线性特性以及信息运动过程提供了必要的理论基础。通过信息与成矿信息、虚拟现实技术与成矿预测可视化和信息模型与成矿系统三个方面探讨信息科学的发展与矿产预测之间的紧密联系,预测未来成矿预测将向定量化、精细化的方向发展,对矿的定位预测从以分析为主向分析与综合相结合方向发展。  相似文献   

Numerical Simulation of Abnormal Wave Height Change Induced by Excavated Waterway with Boussinesq Equation     

Zhang Yonggang  Li Yucheng Associate Professor  Dept. of Mechanic Engineering  Shanghai Jiao Tong University  Shanghai Professor  Dept. of Civil Engineering  Dalian University of Technology  Dalian 《中国海洋工程》1998,(1)

A nonlinear numerical model has been set up by use of Boussinesq Equation with finite differ-ence method,and has been applied to the simulation of the abnormal change of wave height induced by ex-cavated waterway.Numerical results demonstrate that the abnormal change of wave height is due to theadding of the reflected wave height induced by excavated waterway to the incident wave height.Becausethe angle between the incident wave and the axis of the waterway is smaller than the critical angle,the re-flected wave produced by the waterway may propagate to the breakwater and may be added with the inci-dent wave,then the abnormal change of wave height before the breakwater may be caused.So the wave re-flection caused by the change of water depth cannot be neglected.  相似文献