Geochemical speciation and spatial distributions of phosphorus in surface sediments from the basin of the Marcus-Wake seamounts in the western Pacific Ocean     

Chao Yuan  Fansheng Meng  Xuying Yao  Jianyu Ni 《海洋学报(英文版)》2022,41(4):80-90

The concentrations of five forms of phosphorus(P) including exchangeable or loosely adsorbed P(Ex-P), Febound P(Fe-P), authigenic P(Auth-P), detrital P(Det-P), and organic P(Org-P) from the basin among the Marcus-Wake seamounts(19.4°–24°N, 156.5°–161.5°E) in the western Pacific Ocean were quantified using a sequential extraction method(SEDEX) to investigate the distribution and sources of different P species.Concentrations of total P(TP) varied from 14.0 μmol/g to 44.1 μmol/g, with an average of...  相似文献   

Outlines of New Global Geochemical Mapping Program   总被引：3，自引：1，他引：2  

Xie Xuejing  Yao Wensheng 《《地质学报》英文版》2010,84(3):441-453

<正>Since 1988,great efforts and enthusiasm had been paid by applied geochemists in the implementation of global geochemical mapping through the International Geological Correlation Program's Projects 259 and 360,and the Task Group on‘Global Geochemical Baselines' established by the International Union of Geological Sciences(IUGS),in collaboration with the International Association of Geochemistry(IAGC).But how to use extremely low-density sampling to obtain a global picture of the distribution of most elements in the periodic table in a reasonably short time is still a great challenge faced by the applied geochemistry community.It will depend on the continuous development of new mapping concept,and the advisable and courageous innovation of methodology for searching other suitable sample media and sampling layout.Based on the encouragement results obtained from the representativeness study of delta sediments conducted at the mouth of Yangtze River,and at the mouths of its four major tributary,it is expected to broadly apply the geochemical fractal self-similarity nature to main rivers and their estuaries with catchments up to hundreds of thousands or over a million square kilometers in the world.With this new mapping concept,a new outlines of a Global Geochemical Mapping Program was advanced and the establishment of an International Research Center of Global Geochemical Mapping was also suggested to facilitate the programs implementations.  相似文献   

New Bradoriid Arthropods from the Early Cambrian Balang Formation of Eastern Guizhou, South China     

PENG Jin  Feng Hongzhen  Fu Xiaoping  Zhao Yuanlong  Yao Lu 《《地质学报》英文版》2010,84(1):56-68

The Early Cambrian Balang Formation is comprised of mudrock and shale, which was deposited in a shelf environment in the eastern part of Guizhou, south China. The Balang Fauna, which consists of seven phyla, occurs in the middle and upper parts of the Balang Formation. Arthropods are important constituents of the Balang Fauna and include a great number of trilobites, large bivalved arthropods, and newly-discovered well-preserved bradoriid fossils. The bradoriids present include three genera and four species : Comptaluta inflata (Cheng, 1974) emend Hou et al., 2002; Comptaluta kailiensis sp. nov., and Alutella elongeta sp. nov., Aluta sp. This faunal assemblage in the Balang Formation is distinguished from the Tsunyiella Chang, 1964, Songlinella Yin, 1978 and Kunmingella Hou, 1956 assemblage which occurs in the Niutitang and Mingxinsi formations of the Yangtze Platform in middle region of Guizhou and which is earlier than the Balang Formation in age. However, this assemblage resembles the Comptaluta pik, 1968 assemblage from the Early Cambrian Heilinpu Formation in Wuding County, Yuanan Province and from the Ordian Stage of the Cambrian of Australia. The great abundance of Comptaluta pik, 1968 and overall taxonomic diversity of the Comptaluta pik, 1968 assemblage set it distinctly apart from the Alutella Kobayashi et Kato, 1951 and Aluta Hou, 1956 assemblages of the Balang Formation. Alutella Kobayashi et Kato, 1951 and Aluta Hou, 1956 also occur in the Early Cambrian Niutitang Formation of the Yangtze Platform of Guizhou. Individual Bradoriids from the Balang Formation are characterized by large size (3 mm). The discovery of new Bradoriid assemblages not only expands the group’s geographical range and assemblage affinities, but also indicates that Bradoriids migrated eastward from shallow-water to deeper-water environments during the Early Cambrian, indicating that they were capable of life in deeper-water, and adaptation to a new ecological setting.  相似文献   

On Magma-Genetic Characteristics of Skarn and Its Formation Mechanism     

Lin Xinduo Zhang Shuzhen Xu GuqjianChina University of Geosciences  Wuhan Zhang Chuanling  Yao Shuzhen  Zhang Dehui also participated in this study . 《中国地质大学学报(英文版)》1993

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Particle size truncation effect on the inference of effective particle diameter     

Liu Chunlei  Yao Keya 《大气科学进展》1997,14(3):350-354

The effective ice crystal particle diameter (De) of cirrus clouds can be inferred by comparing the measured radar / lidar backscattering ratio with the theoretically calculated one. The calculated ratios are based upon assump-tions of ice crystal particle density and size distribution, and it will be affected by the artificially assumed particle size ranges. This size truncation effect on the inference of effective particle diameter will be investigated theoretically by assuming the cirrus ice particle spherical and particle density of 0.9g / cm3. Results show that the truncation at large particle end has very small effect on the inference of De , but the truncation at the small particle end will have some ef-fect on the inference of De.  相似文献   

山东省昌乐蓝宝石矿地质特征     

周登诗刘继太  杨道荣张培强 《山东地质》2003,19(2):26-29

山东迄今发现的蓝宝石砂矿和原生矿位于昌乐地区。根据成因蓝宝石砂矿层分为冲积砂矿层、洪积砂矿层和残坡积砂矿层；洪积砂矿层中蓝宝石最富。蓝宝石原生矿赋存于新生代新近纪临朐群牛山组和尧山组的玄武岩中，与高钾碱性玄武岩关系密切。  相似文献   

南亚高压的季节变化与趋暖性   总被引：27，自引：3，他引：27  

Qian Yongfu  Zhang Qiong  Yao Yonghong  Zhang Xuehong 《大气科学进展》2002,19(5):821-836

利用NCEP／NCAR再分析资料，分析了南亚高压的季节变化，讨论了对流层中高层温度、整层大气视热源和非绝热加热率的时空变化对南亚高压季节变化的影响。结果表明，南亚高压存在两个季节平衡态，即夏半年的大陆高压和冬半年的海洋高压，大陆高压又可分为青藏高压和伊郎高压。加热场对南亚高压的季节变化有重要作用，南亚高压是一个暖性高压，其中心有“趋热性”，通常位于或趋于加热率的相对大值区。南亚高压的年循环过程，主要受南亚地区潜热和感热季节变化的支配。夏季北方地区和高压地区的强烈短波辐射加热对高压中心北移和维持也有作用，长波辐射的冷却作用则是高压减弱的重要原因。  相似文献   

DISCOVERY AND THE IMPLICATION OF A HYDROTHERMAL-METASOMATIC SKARN DEPOSIT IN GANGDISE TECTONIC ZONE,TIBET   总被引：3，自引：0，他引：3  

Yao Peng  Li Jingao WT  ”BX 《地学前缘》2000,(Z1)

DISCOVERY AND THE IMPLICATION OF A HYDROTHERMAL-METASOMATIC SKARN DEPOSIT IN GANGDISE TECTONIC ZONE,TIBET  相似文献   

A DEEP SEISMIC REFLECTION PROFILE ACROSS ALTUN FAULT BELT   总被引：1，自引：0，他引：1  

Gao Rui  Liu Hongbin  Li Qiusheng  Li Pengwu  Yao Peiyi  Huang Dongding 《地学前缘》2000,(Z1)

A DEEP SEISMIC REFLECTION PROFILE ACROSS ALTUN FAULT BELTtheNationalkeyfoundationresearchanddevelopmentplanfund(G19980 40 80 0 )  相似文献   

Effect of Soil Moisture-Energy Distribution and Melting-Freezing Processes on Seasonal Shift in Tibetan Plateau     

Yang Meixue  Yao Tandong  He Yuanqing  Toshio Koike WT  ”BX 《地学前缘》2000,(Z1)

EFFECT OF SOIL MOISTURE-ENERGY DISTRIBUTION AND MELTING-FREEZING PROCESSES ON SEASONAL SHIFT IN TIBETAN PLATEAUtheNational(G19980 4 0 80 0 )andCAS’sKeyProjectforBasicResearchonTibetanPlateau (KZ951 A1 2 0 4 ;;KZ951 A1 4 0 2 ;;KZ951 B1 2  相似文献