南海的形成演化与新特提斯在南海的重新活化          下载免费PDF全文

蔡周荣  张毅  刘维亮  万志峰  刘平 《沉积与特提斯地质》2008,28(3):21-24

南海位于印度板块、欧亚板块和太平洋板块之间,是世界上最大的边缘海,其构造位置处于太平洋构造域和特提斯构造域,地质构造复杂.关于南海形成演化的动力学机制存在有多种不同观点,其中最重要的一个观点是印度板块与欧亚板块的碰撞致使华南地块和印支地块地幔物质沿东南方向蠕动,从而导致南海的海底扩张.从特提斯的演化规律,以及新特提斯的闭合过程来看,南海并不是特提斯洋的残留海,而是新特提斯在闭合过程中配合印度板块与欧亚板块碰撞导致华南地块和印支地块地幔物质东南方向蠕动的动力学机制下,在南海重新活化的结果.  相似文献   

基于MapInfo的住宅小区物业管理信息系统研究   总被引：1，自引：0，他引：1  

张萍  陈清国  赵文光 《地理空间信息》2008,6(6):19-22

对GIS在住宅小区物业管理中的应用进行了研究,并以武汉南湖花园为实例,以Mapinfo为开发平台,以VB6．0为开发工具,建立了南湖花园物业管理信息系统,该系统基本实现了物业管理的各种基本功能。  相似文献   

GIS内涵的发展     

黄杏元  黄平 《测绘与空间地理信息》2008,31(1):58-59

根据GIS30多年的发展历程,总结了GIS的三个主要发展阶段及其内涵特点,说明了GISystem、GIScience和GIService的主要研究内容,最后提出了基于GIS内涵的三点初步认识。  相似文献   

云南东川因民铜矿金矿化特征及成因初探     

史文胜  曹新志  蔡志超  连永牢 《化工矿产地质》2008,30(1):23-27

因民铜矿发育两种金矿化类型:一是铜矿的伴生金;二是热液构造蚀变岩型。化探样品分析结果显示,金矿化主要赋存于金箔箐断层上、下盘的角砾状蚀变岩内,空间上受岩性和断裂构造的双重控制。邻区拖布卡金矿的成矿地质背景与本区相似,在成矿地质年代上作以类比推测,认为喜马拉雅期是主成矿期。另外通过对光片镜下和化探原生晕样聚类分析研究,发现构造蚀变岩型金矿化具明显的多期多阶段性及热液特征。  相似文献   

The Research on the Tertiary Sedimentary Facies in the Well Sha 6,Southwest Qaidam Basin     

HU Wangshui  ZHOU Ping  XIAO Chuantao  ZHAO Guozhu 《四川地质学报》2008,28(3)

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柴达木盆地西南部砂6井第三系沉积相研究   总被引：1，自引：1，他引：0  

胡望水  周萍  肖传桃  赵国柱 《四川地质学报》2008,28(3):169-173

结合前人的研究成果,运用野外地质剖面、测井相标志的研究方法,对柴达木盆地西南第三系沉积相进行了较全面、系统的研究,描述了柴达木盆地砂6井第三系主要发育的三种沉积相及发育的主要类型,指出了研究区内有利于油气生成和储集的沉积相类型。  相似文献   

北京农田生态系统土壤重金属元素的生态风险评价   总被引：9，自引：0，他引：9  

丛源  郑萍  陈岳龙  侯青叶 《地质通报》2008,27(5):681-688

2005-2006年期间,分别采集了北京农田生态系统的大气干湿沉降、灌溉水和化肥3种外源输入的样品,共计63件。3种来源样品的年输入通量的定量计算和对比表明,不同地区不同输入途径的重金属元素的年输入通量差异较大,研究区农田土壤中重金属元素的主要输入途径是大气干湿沉降。如果不考虑农田生态系统的外源输出量,按照目前的污染速度,50年后怀柔和大兴地区表层土壤中cd的含量可突破国家土壤环境质量碱性土壤的二级标准。污染情况比较严重,应引起足够的重视。其他地区的外源输入在相当长的一段时间内不会引起表层土壤重金属元素的含量发生质的变化。  相似文献   

福建仙游园庄地区南园组新层型剖面的建立 及时代的重新厘定   总被引：4，自引：0，他引：4  

黄家龙  卢清地  张正义  聂童春  周国武  林敏  郑平 《地质通报》2008,27(6):785-792

在福建省闽侯县鹅宅-南园村层型剖面所划分的南园组被证实为早白垩世石帽山群后,原鹅宅-南园村割面已失去层型剖面的意义.通过125万周宁县幅、福州市幅、莆田市幅、泉州市幅的区域地质调查和系统研究,在福建省仙游县园庄建立了南园组的新层型剖面,重新厘定了南园组的地层层序和岩石组合,根据地层叠覆关系、同位素测年和古生物资料的系统研究结果,将南园组的时代重新厘定为晚侏罗世-早白垩世初期.  相似文献   

Climate changing characteristics of Zhangye City in Heihe River basin during 1968–2005     

Mingji Li  Yuxia Ma  Peiji Shi 《Frontiers of Earth Science》2008,2(2):243-248

At present, researches on climate change of the Heihe River basin mainly focus on the relationship between basin climate change and regional water resources, regional desertification and dynamic climatic seasons of sandstorm, but less on climate change of oasis region, where there are more intense and frequent human activities. Based on data of precipitation, temperature, strong wind and dust events frequencies obtained from the six meteorological stations of Zhangye region in Heihe River basin, the features of climate change during 1968–2005 were carefully studied. Results show that the regional temperature rise rate exceeded the average level of China. The annual precipitation changed a little, but the precipitation had a slowly increasing trend in spring and winter. Frequencies of strong wind and sandstorm days show obviously descending trends, which had a close correlation with the regional temperature rise and the precipitation increase in spring and winter. Meanwhile, further human economic activities and exploitations to the oasis in the inland valley of arid regions also affected the climate change of this region, which has a sensitive and fragile eco-environment. __________ Translated from Journal of Desert Research, 2007, 27(6): 1048–1054 [译自: 中国沙漠]  相似文献   

Octahedral-site Fe2+ quadrupole splitting distributions from Mössbauer spectroscopy along the (OH, F)-annite join     

D. G. Rancourt  J. Y. Ping  B. Boukili  J. L. Robert 《Physics and Chemistry of Minerals》1996,23(1):63-71

We have performed a detailed Mössbauer study of synthetic annites on the (OH, F)-join. Recently developed data treatment and spectral analysis methods were used to extract true intrinsic Fe²⁺ quadrupole splitting distributions (QSDs) that represent the most information that can be resolved from the spectra. The overall room temperature (RT) QSDs can be consistently interpreted in terms of four QSD contributions (or populations) centered at: QS_HH2.55 mm/s for Fe²⁺O₄(OH)₂ octahedra (cis and trans not resolved), QS_HF 2.35 mm/s for Fe²⁺O₄(OH)F octahedra (cis and trans not resolved), QS_cFF2.15 mm/s for cis-Fe²⁺O₄F₂ octahedra, and QS_tFF 1.5 mm/s for trans-Fe²⁺O₄F₂ octahedra. Each such contribution has a width ( 0.2 mm/s) caused by distortions of the octahedra. Minor contributions due to Fe²⁺O₅(OH) and Fe²⁺O₅F octahedra probably also contribute to the overall Fe²⁺ QSDs. The ferric iron spectral components were also characterized. Here, two distinct types of octahedral Fe³⁺ contributions are seen and interpreted as being due mainly to Fe³⁺O₅OH and Fe³⁺O₅F octahedra, respectively. Tetrahedral Fe³⁺ is seen only in the OH-annite end-member and the total Fe³⁺ content drops significantly on addition of F. On leave from: Department of Materials Physics, University of Science and Technology Beijing, 100083 Beijing, China  相似文献