世纪之交的地球科学空前盛会———北京第30届国际地质大会综述     

童潜明 《湖南地质》1996,(4)

北京第３０届国际地质大会盛况空前。本文围绕大会主题进行的学术交流，综述了地质工作者们在矿产资源的可供性、地球环境的保护和减灾等方面取得的巨大成就及今后艰巨的任务，表明地质科学正处于一个崭新纪元的开端。面向未来，地质工作者们还有很多工作要做  相似文献   

新亚欧大陆桥中国段矿业发展战略构想与对策     

赵剑畏  高德云 《江苏地质》1996,20(2):72-77

我国大陆桥沿线矿产资源丰富，有６４种矿产的保有储量在全国名列第一，其中煤，钠盐，石膏，镍，铝土矿，钼，耐火粘土和玻璃硅质原料等主要矿产在全国具有举足轻重的地位，发展潜力大，开发前景好。新亚欧大陆桥的贯通，给我国沿桥地区矿产资源开发和经济发展提供了契机。应把握机遇，尽快将矿产资源优势转化为经济优势，实现经济增长方式由粗放型向集约型转变。根据沿桥矿业现状，市场需求和资源保证程度，应重点发展能源等矿业。  相似文献   

江苏溧水爱景山锶矿床技术经济评价及开发方案研究     

张福祯 《江苏地质》1996,20(2):120-122

溧水爱景山锶矿床小规模开发已十余年，１９９２年，该矿床全部勘探完毕，可大规模开发利用。文章对年产原矿１．７万吨，３，４肆吨，５．１万吨三个开发方案分别进行了静态经济效益和动态经济效益评价，并对三个方案的优劣进行了比较，最终优选出年产原矿３．４万吨的Ⅱ方案的最优方案。为合理开发利用该矿床提供了初步依据。  相似文献   

厦门市土地利用/覆盖动态变化的遥感检测与分析   总被引：15，自引：7，他引：15  

李天宏  韩鹏 《地理科学》2001,6(6):537-543

在分析1990年和1997年两个时相陆地卫星TM遥感图像的基础上，得到了厦门市土地利用/覆盖的动态变化信息，并对其数量变化和空间特征进行了分析。结果表明：1990～1997年，厦门市的城镇建设用地和开发用地显著增加，耕地被占用的现象比较突出，开发用地的重点也由厦门经济特区向近郊区转移。  相似文献   

西藏亚东淡色花岗岩Rb—Sr和Sm—Nd同位素研究——关于其年龄和源岩的证据   总被引：16，自引：1，他引：16       下载免费PDF全文

杨晓松  金振民 《地质论评》2001,47(3):294-300

对西藏亚东淡色花岗岩Rb-Sr和Sm-Nd同位素的详细研究表明,亚东淡色花岗岩Rb-Sr和Sm-Nd同位素组成十分不均匀,其初始Sr值和ε-(Nd)(13 Ma)分别介于0.756～0.775和-11.6～-16.3。由于存在着显著的同位素变异,而难以获得其全岩Rb-Sr等时线年龄。但研究获得了12.9±0.95Ma矿物—全岩Rb-Sr等时线年龄,其锶初始值为0.7744±0.0008,该年龄可以与高喜马拉雅带其他淡色花岗岩的年龄对比。Rb-Sr和Sm-Nd同位素组成显示亚东淡色花岗岩的源岩很可能是聂拉木群副变质岩。年龄统计分析表明,喜马拉雅淡色花岗岩是在地壳伸展和快速隆起背景下形成的,因此它的形成年龄是碰撞造山后地壳强烈活动和快速隆起的重要标志。  相似文献   

道马矿和红石矿的最新研究资料     

於祖相 《地质学报》2001,75(3)

道马矿与其他铂新矿物于1974年作了初步报道(於祖相等,1974)。1978年对道马矿的进一步工作成果又作了报道(於祖相等,1978)。本矿物在1982年获得国际新矿物与矿物命名委员会的批准(Bul-letin,1976,1982;Fleisher et al.,1976a,1976b)。由于当时条件所限,道马矿反射率仅有4个波段数值。现重进行测定以及对矿物的晶胞参数等用四圆衍射仪进行修正,并补充矿物新的产状以及矿物命名根据。  相似文献   

Geochronology and Geochemistry of the Middle Proterozoic Aoyougou Ophiolite in the North Qilian Mountains,Northwestern China     

Paul T.ROBINSON 《《地质学报》英文版》2001,75(1):41-50

The Aoyougou ophiolite lies in an early Palaeozoic orogenic belt of the western North Qilian Mountains, near the Aoyougou valley in Gansu Province, northwestern China. It consists of serpentinite, a cumulate sequence of gabbro and diorite, pillow and massive lavas, diabase and chert. Ages of 1840±2 Ma, 1783±2 Ma and 1784±2 Ma on three zircons from diabase, indicate an early Middle Proterozoic age. The diabases and basalts show light rare-earth element enrichment and have relatively high TiO2 contents, characteristic of ocean island basalts. All of the lavas have low MgO, Cr, Ni contents and Mg numbers indicating a more evolved character. They are believed to have been derived from a more mafic parental magma by fractionation of olivine, Cr-spinel and minor plagioclase. Based on the lava geochemistry and regional geology, the Aoyougou ophiolite was probably believed to have formed at a spreading centre in a small marginal basin. Subduction of the newly formed oceanic lithosphere in the Middle Proteroz  相似文献   

Fluid Inclusion Studies and Geochemistry of Rare Earth Elements of Hydrothermal Fluorites from Pohrenk, Kirsehir, Central Turkey     

Sükrü KOC  Ali RECBER 《《地质学报》英文版》2001,75(1)

Fluorite mineralization occurs along fractures and cracks of Middle Eocene and Pliocene limestones and marls in the north and northeast of the Pohrenk region (Qicekdagi, Kirsehir). Tb/Ca - Tb/La and Y/Ho ratios were obtained from REE contents of fluorites which have revealed that mineralization is of hydrothermal type. Negative Ce anomalies and positive Eu anomalies reflect that hydrothermal solutions once had high oxygen fugacity. Fluid inclusion studies indicate that homogenization temperatures of mineralization varied between 90℃ and 200℃, and hydrothermal solutions are composed of NaCl + KCl + MgCl2 + H2O. In addition, salinity measurements show that hydrothermal solutions were mixed with meteoric or rock formation water. Geologic setting, REE geochemistry and fluid inclusion studies suggest that mineralization was deposited from a solution generated by mixing of magmatic and meteoric water under epithermal conditions.  相似文献   

Geochemical Characteristics and Genesis of the Granitic Gneisses from the Southeastern Dabie Mountains   总被引：2，自引：0，他引：2  

XUE Huaimin  DONG Shuwen  LIU Xiaochun Chinese Academy of Geological Sciences  Beijing Nanjing Institute of Geology  Mineral Resources  Nanjing Institute of Geomechanics  Beijing 《《地质学报》英文版》2001,75(2):175-183

The granitic gneisses from the ultrahigh-pressure (UHP) metamorphic terrain of the southeastern Dabie Mountains encompass two types: monzonitic granitic gneiss and alkali-feldspar granitic gneiss, which are characterized by rich alkalis, poor CaO, high FeO/MgO, particularly high Ba, Rb, Th, Ta, REE (except Eu), Ga, Nb and Zn, and low Sr, Eu, Cr, Co and Ni. The gneisses, particularly the alkali-feldspar granitic gneiss, have typical chemical characteristics of A-type granites. They resulted from partial melting of crustal materials existing in the rift zone along the northern margin of the South China block during the Neoproterozoic. These gneisses might not have undergone UHP metamorphism during the late Triassic, but were involved into UHP rocks by the tectonic mixing process and kept the exhumation message of the UHP rocks from the middle and upper crust.  相似文献   

Rational Exploitation of Resources and Prevention of Geohazards in Karst Regions   总被引：1，自引：0，他引：1  

LU YaoruInstitute of Hydrogeology  Environmental Geology  Chinese Academy of GeologicalSciences  Zhengding  China 《《地质学报》英文版》2001,75(3):239-248

This paper discusses the rational exploitation of main resources and prevention of geohazards in karst regions. There exist relationship chains between natural disasters in the earth, which include the chain between geological hazards and climatic hazards, the chain between geological hazards and biogenic hazards as well as the one between geological hazards. Irrational exploitation of all resources will inevitably cause hazards. Therefore it is very important to discuss the problem related to prevention of geohazards by rational exploitation of resources.  相似文献