Metallogenic Age of Dapinggou Gold Deposit in Northern Altun Area, Northwestern China

INTRODUCTION Metallogenicchronologyisthebasefromwhich weunderstandtheevolutionarypatternandorderofa metallogenicprovince(PeiandWu,1993).Research intometallogenicepochsisanindispensableareaof studyonmineraldeposits,regionalgeologyandtec tonics,andalsoaprer…     

Seismic Analysis of Shear-Wall Structures with Vertically Installed Dampers

Theapplicationofreinforcedconcrete(RC)shear wallbuildingsisquitecommoninseismicare as.Shearwalls,withlargerigidityandhigh strength,aretheprimarymembersforresistinghori zontalloadsinbuildingstructures.Butunderthe forceofasevereearthquake,shearwallsareprone…     

ABNORMAL GEOMAGNETIC FIELD RESPONSE AT INTRAPLATE TECTONIC BOUNDARY IN CONTINENT AND CONTINENTAL MARGIN IN SOUTHEASTERN CHINA

South China landmass is located at the southeastern end of Eurasia, adjoining Qinghai-TibetPlateau in the west, bordering Qinling-Dabie orogen in the north and the West Pacific in the east, andbeing connected to South China Sea in the south, hence the topography landscape shows transition froman inland type to a continental marginal type. Ever since Late Achaeozoic to Early Proterozoic,Cathaysia and Yangtze blocks has undergone multiple stages of splitting and amalgamation, and did notfi…     

An Efficient Procedure for Isolating Microsatellite DNAs from Sea Cucumber(Apostichopus japonicus)

1 Introduction Microsatellite DNAs, also called simple sequence re-peats (SSRs), are stretches of DNA, consisting of tan-demly repeating mono-, di-, tri-, tetra- or penta-nucleotide units. They are evenly distributed throughout the ge-nomes of most eukaryotic species (Tohn et al., 2000). Their high information content about the divergence of genome, which is directly related to the number of alleles at each locus, and the ease of PCR assays make them ex-cellent molecular markers (Powell …     

道路影响域的界定及其空间分异规律 ——-以纵向岭谷区为例

以纵向岭谷区道路网络为研究对象,考虑地形等相关因子,利用GIS 图形叠加分析得到区域道路影响域的范围,进一步统计道路影响域面积与区域面积的比例,探寻道路对区域影响的空间分异规律,并分析其与道路密度、人口密度、村庄数目、生态承载力、平均海拔高度等因素的相关性。结果表明：纵向岭谷区道路不同等级具有不 同的影响域范围,区域道路影响的空间分布存在差异,由省会昆明逐渐向周边辐射减小,红河流域高于澜沧江流域和怒江流域。在纵向岭谷区东部、北部、西南部部分地区道路影响呈现显著的空间集聚效应。影响因子的相关性分析表明,道路影响域比例与平均海拔高度不相关,与道路密度、人口密度、村庄数目、生态承载力相关显著。     

LA-ICP-MS U-Pb Zircon Dating for Felsic Granulite, Huangtuling Area, North Dabieshan: Constraints on Timing of Its Protolith and Granulite-Facies Metamorphism, and Thermal Events in Its Provenance

Information about the protolith of the Huangtuling granulite in North Dabieshan has been unavailable. The complex evolution history of the rock and its host basement must be further discussed. LA-ICP-MS U-Pb dating was conducted on three textural domains in zircon from a high-temperature, high-pressure felsic granulite in the Huangtuling area, North Dabieshan, Central China. The metamorphic growth-derived detrital zircon domain yields a 207Pb/206Pb age in the range of (2 493±54) -(2 500±180) Ma. The magmatic genesis-derived detrital zircon domain gives a 207Pb/206Pb age ranging from 2 628 Ma to 2 690 Ma, with an oldest 206Pb/238U age of (2 790±150) Ma. The metamorphic overgrowth or metamorphic recrystallization zircon domain yields a dicsordia with an upper intercept age of (2 044.7±29.3) Ma. Compositions of the mineral assemblage, major element geochemistry, and especially the complex interior texture of the zircon suggest that the prololith of the felsic granulite is of sedimentary origin. Results show that the protolith material of the granulite came from a provenance with a complex thermal history, i.e. ～2.8 Ga magmatism and ～2.5 Ga metamorphism, and was deposited in a basin not earlier than 2.5 Ga. The high-temperature and high-pressure granulite-facies metamorphic age was precisely constrained at (2.04±0.03) Ga, which indicates the granulite in Huangtuling area should be a relict of a Paleoproterozoic UHT (ultrahigh temperature) metamorphosed slab.     

阿尔金山国家级自然保护区基于GIS-生态位模型的野牦牛栖息地辨识研究

阿尔金山国家级自然保护区是青藏高原的特有种—野牦牛的三大保护区之一,客观地划分保护区内不同适宜度的栖息地及其功能分区,是保护野牦牛种群数量持续发展的有效途径。以生态位理论为指导,综合应用GIS技术和层次分析法,构建基于GIS的生态位模型,厘定野牦牛的适宜栖息地并划定相应的功能分区。结果表明:面积最大的高适宜性栖息地位于卡尔墩检查站周围区域,保护区北部沿阿尔金山存在着一条高适宜性廊道,面积较小的高适宜性栖息地零星分布在保护区西南部;高适宜性栖息地与中适宜性栖息地的面积总和为1.81×104km2,占保护区总面积的38.8%。在保护区功能区划上,应将所有的高适宜性栖息作为核心区;应将中适宜性栖息地及以高适宜性栖息地为中心周围5 km的缓冲地带作为缓冲区;保护区内的其他区域应作为实验区。     

3D CFD MODELING OF WATER AND SEDIMENT FLOW IN A HYDROPOWER RESERVOIR

１ＩＮＴＲＯＤＵＣＴＩＯＮＲｅｓｅｒｖｏｉｒｓｅｄｉｍｅｎｔａｔｉｏｎｉｓｒｅｃｏｇｎｉｚｅｄａｓｏｎｅｏｆｔｈｅｍａｉｎｐｒｏｂｌｅｍｓａｆｅｃｔｉｎｇｔｈｅｅｃｏｎｏｍｉｃｓｏｆｍａｎｙｗａｔｅｒｒｅｓｏｕｒｃｅｓｐｒｏｊｅｃｔｓ．Ｍａｎｍａｄ...