基于多源空间数据的塔里木河下游湖泊变化研究     

阿布都米吉提⋅阿布力克木  阿里木江⋅卡斯木  艾里西尔:库尔班  曼孜然:吐尔逊 《地理研究》2016,35(11):2071-2090

利用历史图件、地形图及遥感数据监测塔里木河下游诸多湖泊水域面积并分析近一百多年的变化情况。根据湖泊水域及其变化,该区湖泊在100多年内变化过程可以分为3个时间段：① 20世纪60年代以前,该区水文条件较好,19世纪末20世纪初湖泊总面积超过2000 km²;20世纪60-70年代至20世纪末,随着水利设施的陆续兴建,湖泊水域缩小,甚至某些湖泊彻底干涸;21世纪随着塔里木河流域综合治理与下游生态输水工程的实施,该区水文条件有所好转,干涸多年的一些湖泊重新形成水域,2013年湖泊水域总面积达760 km²。② 根据湖盆成因及水域变化把该区湖泊分为：河道西侧的风成湖,河道网之间及东侧的河成湖及河道末端的构造湖等三类。③ 初步总结风成湖演变过程,发现该区风成湖与河成湖在形状、深度、水质、形成时间等方面有较大差异。④ 近代人为因素对湖泊水域变化的影响高于自然因素。  相似文献   

New Tapejarid Pterosaur from Western Liaoning, China   总被引：6，自引：1，他引：5  

Lü Junchang  YUAN Chongxi Institute of Geology  Chinese Academy of Geological Sciences  Beijing  E-mail: tmcpl@yahoo.com 《《地质学报》英文版》2005,79(4):453-458

A new tapejarid pterosaur Huaxiapterus jii gen. et sp. nov. is erected based on a nearly complete skeleton with a skull. The skull morphology of Huaxiapterus jii gen. et sp. nov. appears transitional between the skulls of Sinopterus and Tapejara. The skull morphology （low crest） of Huaxiapterusjii indicates that Huaxiapterus is more closely related to Sinopterus than to Tapejara, which has a high crest. The relatively long and shallow skull of Sinopterus indicates that it is a primitive form. Huaxiapterus is more derived than Sinopterus but more primitive than Tapejara.  相似文献   

Geochemical Characteristics and Genesis of the Luxi-Xianrenzhang Diabase Dikes in Xiazhuang Uranium Orefield, Northern Guangdong Province   总被引：4，自引：0，他引：4  

LING Hongfei  SHEN Weizhou  DENG Ping  JIANG Shaoyong  JIANG Yaohui  YE Haimin  PU Wei  TAN Zhengzhong State Key Laboratory of Mineral Deposit Research  Department of Earth Sciences  Nanjing University  Nanjing  Jiangsu  E-mail: hfling@icpms.nju.edu.cn Research Institute No.  CNNC  Shaoguan  Guangdong 《《地质学报》英文版》2005,79(4):497-506

The Luxi-Xianrenzhang diabase dikes were emplaced into the eastern part of the Guidong composite granitoids in northern Guangdong Province at the end of the Early Cretaceous. They show tholeiitic features, enrichment in large ion lithophile elements, slight enrichment in light rare earth elements, depletion in Zr and Hf, and basically no depletion in Nb and Ta and no Eu anomaly. They are similar to intraplate basalt in terms of trace element characteristics. They have high εNd（t） values （3.6-4.9）, initial ^87Sr/^86Sr ratios （0.70530-70641） and δ^18O values and Dupal anomaly of Pb isotope compositions. Their Sr-Nd, Pb-Sr, Pb-Nd and Pb-Pb isotopes plot between DMM and EMII, with Pb similar to EMII, Nd relatively close to DMM and Sr in between. This profile suggests that the diabase dikes studied were derived from partial melting of a mantle source that had been subjected to metasomatism by fluids originated from a subduction zone under a tectonic environment of crustal extension and lithosphere thinning in the late Yanshanian.  相似文献   

Coalbed Methane-bearing Characteristics and Reservoir Physical Properties of Principal Target Areas in North China   总被引：5，自引：0，他引：5  

TANG Shuheng  SUN Shenglin  HAO Duohu  TANG Dazhen China University of Geosciences 《《地质学报》英文版》2004,78(3):724-728

The coalbed methane (CBM) resources in North China amounts up to 60% of total resources in China. North China is the most important CBM accumulation area in China. The coal beds of the Upper Paleozoic Taiyuan and Shanxi formations have a stable distribution. The coal reservoir of target areas such as Jincheng, Yanquan-Shouyang, Hancheng, Liulin, etc. have good CBM-bearing characteristics, high permeability and appropriate reservoir pressure, and these areas are the preferred target areas of CBM developing in China. The coal reservoirs of Wupu, Sanjiaobei, Lu'an, Xinmi, Anyang-Hebi, Jiaozuo, Xinggong and Huainan also have as good CBM-bearing characteristics, but the physical properties of coal reservoirs vary observably. So, further work should be taken to search for districts with high pressure, high permeability and good CBM-bearing characteristics. Crustal stresses have severe influence on the permeability of coal reservoirs in North China. From west to east, the crustal stress gradient increases, whil  相似文献   

本刊加入万方数据(ChinaInfo)系统科技期刊群的声明     

为了实现科技期刊编辑出版发行工作的电子化  推进科技信息交流的网络化进程  我刊现已入网“万方数据 《地质通报》1999

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Structural Evidence for the in-situ Origin of the HP and UHP Eclogites in the Dabie-Sulu Orogenic Belt   总被引：3，自引：1，他引：3  

ZHONG Zengqiu  YANG Qijun  SUO Shutian  ZHOU Hanwen  YOU Zhendong China University of Geosciences  Wuhan  Hubei  E-mail: zqzhong@cug.edu.cn Hao Ziguo  Liu Xinzhu 《《地质学报》英文版》2003,77(3):304-310

Whether the HP and UHP metamorphic rocks of the Dabie-Sulu orogenic belt are of an "in-situ" or "foreign" origin is a long-standing dispute among geologists. Eclogites preserved today in the HP and UHP units constitute merely 5-10%, which are not isolated exotic bodies tectonically intruding into amphibolite facies gneiss, but remnants of once pervasive or widespread eclogite-facies terranes or slabs. The present spatial distribution and forms of the eclogites have resulted from polyphase and progressive deformation and strain partitioning of the HP and UHP slabs. From their formation in deep mantle to their exhumation to the surface, the eclogites have experienced long-term deformation with different strain regimes. The dominant regime responsible for the present spatial distribution and forms of the eclogites is the shear process. The deformation patterns of the eclogites and gneiss matrix also clearly show that the eclogites were metamorphosed in situ. The original distribution area of the eclogites  相似文献   

THE FRAGMENTS OF COMET HYAKUTAKE (C/1996 B2)     

Chen Dao-han Zhao Ai-di Wu Qin-di Song Yi Fan Yi-xin 《紫金山天文台台刊》1998,(2)

Several fragments of Comet Hyakutake were observed in March and April of 1996. This leads to the impression that the splitting of Comet Hyakutake on a small scale occurred frequently. Data analysis points to a rotation period of about 6.18hr if the fragments of Apr. 11 are the condensations within a jet.  相似文献   

征订启事     

本刊年征订工作业已开始。本刊委托天津市全国非邮发报刊《联订服务部》办理订阅事宜。定价每册.元  全年订价.元。凡需订阅者请将订刊款通过邮局或银行汇款至下列地址即可：　　邮政编码：　　地址：天津市大寺泉集北里别墅号户头全称：天津市河西区联合征订服务部帐 号：-　　开户银行：工商行天津市尖山分理处电 话： 《天文学进展》2000,18(3):191

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ECO-ENVIRONMENT CHANGE AND SOIL EROSION PROCESS IN THE RECLAIMED FORESTLAND OF THE LOESS PLATEAU     

ZHA Xiao-chun  TANG Ke-li 《中国地理科学(英文版)》2003,13(3):232-237

1INTRODUCTIONSerioussoilerosionhasmadetheeco-environmentfragileintheLoessPlateau.InthemodernsoilerosionoftheLoessPlateau,theman-madeerosionwasthedominanterosionpattern (TANGetal.,1993a,1993b).Manyhumanactivitiesacceleratesoilerosion,butthemostinfluentialactivitiesaretodestroyforestandgrass,eventodestroyallvegetation.Reclamationbydestroyingforestlandandgrasslandartificiallycouldrapidlyincreasesoilerosionintensityinshorttimeandenlargeerosionspacegradually,evenchangeerosiondirectionandwor…  相似文献   

省民族团结创建工作专项考核组来我厅考核民族团结进步创建工作     

韩青青 《青海国土经略》2018,(2)

正4月10日,全省民族团结第五考核组对我厅的民族团结进步先进区创建工作进行了考核,厅党组书记、厅长杨汝坤主持汇报会。各事业局班子成员,厅机关全体干部,直属各单位副处级以上干部120人参加了考核大会。按照会议议程,第五考核组组长王海德强调了我省创建民族团结进步先进区的重要意义,明确了考核内容,提出了考核要求。他指出,民族团结是各族人民的生命线,是实现我省"四个转变"发展战略的重要途径,  相似文献