TREND OF PRECIPITATION VARIATION IN HUBEI PROVINCE SINCE THE 1960S

1INTRODUCTIONOneoftheeffectsofglobalwarmingisthatprecipita-tionhasincreasedoversomeareasintheworld,andthegaugedataofprecipitation (excludingAntarctica)showthatglobalprecipitationhasincreasedslightlybyabout9mmforthe20thcentury, whichwas verysmallcomparedwiththeinterannualandmul-ti-decadalvariability(NEWetal.,2001).Butregion-ally,thereexisted agreatdealofdifferences,suchasinmostpartsofAfrica, Amazon,westernSouthAmerica,theweatherhasbecomedrier,andinmostpartsofEuropeandCanada,thereexisted…     

The Latest Research Progress on El Nino

Cold water in the deep Pacific can be drawn up to the surface (or west warm water drifts eastwards) because strong tide increases the mixing of seawater both in vertical and horizontal. In this way greenhouse effect is decreased or in-creased by means of absorbing (or releasing) CO2. Therefore, La Nina cold event (or El Nino warm event) may occur, which is caused by wanning - up or cooling - down air above the ocean. Volcanic action at sea bottom is also controlled by strong tide.     

Rogoznica Lake(Croatia),a Unique Euxinic Seawater System on the Adriatic Coast

正1 Introduction Rogoznica Lake is a typical example of euxinic saline lake,situated on the eastern Adriatic coast(43o32’N15o58’E).It is a karstic depression filled with seawater,     

菲律宾Zambales蛇绿岩套的再研究：对其特提斯来源的启示

A number of geological studies have already been conducted on the Zambales Ophiolite Complex (ZOC), a north-south trending complete ophiolite sequence exposed in the western portion of Central Luzon, Philippines. Previous works recognized the ZOC as being made up of two blocks, the Acoje and the Coto, acting as an arc-back arc pair sometime during the Eocene.     

Petrographic and Geochemicial Characteristics of the K?z?loren Formation (Upper Triassic-Lower Jurassic) in the Akp?nar (Konya, Turkey) Area

This paper describes the occurrence of dolomite and the mechanism of dolomitization of the Upper Triassic-Lower Jurassic K?z?loren Formation in the autochthonous Bolkardag? unit of the middle Taurus Mountains in south western Turkey. Dolomites were analyzed for geochemical, isotopic and crystallographic variation. Dolomites occur as a replacement of precursor carbonate and cement. The dolomite crystals range from <10 to ~1000 μm existing as both replacements and cements. Sr concentrations range between 84 and 156 ppm, and the molar Sr/Ca ratios of dolomitizing fluids are estimated to range between 0.0066 to 0.013 ratios. Dolomites are Ca-rich (with average CaCO3 and MgCO3 equal to 56.43 and 43.57 mol%, respectively) and they are non-stoichiometric, with an average Sr=116 ppm, Na=286 ppm, Mn=81 ppm, Fe=1329 ppm, and δ18O and δ13C ranges from –0.6‰ to –6.1‰ Pee Dee Belemnite [PDB], and +1.2 to +3.9‰ PDB. The North American Shale Composition [NASC]-normalized rare earth element (REE) values of the both limestone and dolomite sample groups show very similar REE patterns characterized by small positive Eu (mean=1.32 and mean=1.42, respectively) and slightly or considerably negative Ce (mean=0.61 and mean=0.72, respectively) anomalies and a clear depletion in all REE species. The K?z?loren Formation dolomites have been formed as early diagenetic from mixing zone fluids at the tidal-subtidal environment and at the late diagenetic from basinal brines at the shallow-deep burial depths.     

呼图壁地下储气库部分区域地表垂直形变机理研究

利用在呼图壁地下储气库开展的2013~2015年7期二等水准测量获得的高差数据,对受地表气井压力变化影响而发生的地下储气库地表垂直变形进行了分析。研究表明,呼图壁地下储气库区的地表变形除了构造成因引起的盆地下沉以外,其他成因有2个方面:一个是呼图壁地区的地下水超采影响着该地区的地表垂直变化;另一个是储气库集采气期间受井口压力变化影响的地表沉降,根据计算,储气库每MPa气井压力变化影响到的地表变化为0.625~1.125mm。     

Gastropods Associated with Fossil Traces from Yacoraite Formation(Maastrichtian-Danian),and its Paleoenvironmental Significance,Jujuy,Northwestern Argentina

Abstract: We present results tending to characterize the new records of invertebrates from the Yacoraite Formation (Maastrichtian-Danian). The fossils reported come from two stratigraphic sections exposed in the surroundings of Maimará and Jueya, province of Jujuy, northwestern Argentina. The selection was based on geological and paleontological evidence. The recovered fossils include gastropods and invertebrate fossil traces, including Planolites, Skolithos and Gastrochanoelites ichnogenus. As result of our review, we discussed the possibility of assigning the analyzed gastropods to the family Zygopleuridae (gene. et. sp. indet.), as an approximation to the taxonomic resolution of this fossil fauna. The trace fossils were assigned to the archetypical Glossifungites ichnofacies. The study of the fossil assemblage allowed us to define a shallow depositional environment, characteristic of a marine context with high-energy conditions.     

美国Cove Fort-Sulphurdale地热区地震震源机制和各向异性研究

Cove Fort-Sulphurdale位于美国犹他州中西部, 是一个地质特征独特的地热资源富集区． 为了有效开发地热资源, 有必要了解该地区的应力分布和裂缝分布． 本文在前人工作的基础上使用地震资料, 利用波形匹配、 P波极性和横纵波振幅比联合约束反演的方法, 研究该地区地震的震源机制解; 同时结合该地区的横波分裂分析研究, 确定该地区的应力分布和断层/裂隙走向． 波形反演结果显示, 实际数据与模拟数据的波形匹配度非常高, 且二者的P波初动极性和横纵波振幅比也都非常相近． 由震源机制分析得出的断层面走向大部分趋于南北向, 与美国区域应力图显示的最大水平主应力指向(南北方向), 具有较好的一致性, 符合目前研究对该地区的构造认知． 横波分裂分析结果也表明如果各向异性主要是由该地区的断裂构造所引起, 那么该地区的主要断层或裂缝的方向可能为南北向．