Geochemical Information Indicating the Water Recharge to Lakes and Immovable Megadunes in the Badain Jaran Desert   总被引：1，自引：0，他引：1  

CHEN Jiansheng  ZHAO Xi  SHENG Xuefeng  Wang Jiyang  GU Weizu  and CHEN Liang State Key Laboratory of Hydrology-Water Resources  Hydraulic Engineering  Hohai University  Nanjing  Jiangsu  E-mail: jschen@hhu.edu.cn Institute of Isotope Hydrology Research  Hohai University  Nanjing  Jiangsu Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing 《《地质学报》英文版》2005,79(4):540-546

1 Introduction The Badain Jaran Desert, located in western Inner Mongolia, China, has a unique landscape containing 144 lakes (72 of which are still watery) with a total water area of about 23 km2, and the world’s highest stationary sand dunes with a height between 200 m and 500 m. Much attention has been paid to the water recharge of the desert in the past decade. Investigations on the resources of water system there have been performed continuously since the early 1990s, which lead to th…  相似文献   

“青藏高原南部空白区基础地质调查与研究”计划项目新成果、新进展          下载免费PDF全文

Chengdu Institute of Geology  Mineral Resources 《沉积与特提斯地质》2005,(Z1)

通过2 0 0 4年度各相关图幅的大力工作,在基础地质、矿产和资源等方面取得了大量实际材料,综合研究区域构造地层格架、青藏高原地质图和青藏高原南部火山岩及其地球动力学意义等,取得重要进展和新认识,在矿产资源、旅游和人文景观等方面也取得重要阶段性成果。  相似文献   

1∶25万吐错幅、江爱达日那幅、黑虎岭幅、多格错仁幅地质调查成果与进展          下载免费PDF全文

Chengdu Institute of Geology  Mineral Resources 《沉积与特提斯地质》2005,(Z1)

地层古生物方面,在原鲁谷组灰岩和火山岩层位之下新发现一套以类复理石沉积为主的深水沉积物,特别是“冰水杂砾岩”;解体了测区南部前泥盆系“戈木日群”浅变质岩系,大部分厘定为二叠系;新发现一套出露较完整的三叠系地层剖面;南羌塘新建3个组级岩石地层单位。构造方面,“中央隆起带”是龙木错双湖构造带的一部分;测区双湖构造混杂岩带的南北边界均为大型韧性剪切带所分割;新发现上三叠统若拉岗日群岛弧相火山岩;测区南北向新构造调查取得重要进展。油气资源方面,新发现较大规模的沥青脉和几处稠油、油页岩显示点。  相似文献   

关于成矿作用地球化学研究的几个问题   总被引：1，自引：0，他引：1  

张德会 《地质通报》2005,(Z1)

成矿作用地球化学是矿床地球化学的基础理论分支,属于应用基础类学科,以地球化学原理和方法研究造成元素沉淀富集形成矿床的地球化学作用的原因和机理。本文讨论了热液矿床成矿作用的几个问题。指出花岗岩与矿床类型之间是否存在相关性,即花岗岩是否具有成矿专属性仍然存在争论,需要继续探索。花岗岩类具有成矿潜力不等于这些花岗岩最终都能成矿。决定岩浆发生成矿作用的因素很多,其中岩浆分异作用过程和流体释放时间及其机制可能是决定成矿发生和矿床类型的关键,岩浆熔体中挥发组分及其行为可能是岩浆能否发生成矿作用的决定性要素,聚焦流体流动是成矿作用能否发生的关键环节,而自组织临界性和反馈作用决定了成矿效率和矿床的规模。  相似文献   

Oysters’ Impact on Water Quality in the Potomac River Estuary     

Lynton S. Land 《Aquatic Geochemistry》2014,20(5):465-466

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The hydrogeology of the Sacramento Mountains and Roswell and Salt basins of New Mexico,USA: overview of investigations on dryland groundwater systems using environmental tracers and geochemical approaches     

Brent D. Newman  Lewis Land  Fred M. Phillips  Geoffrey C. Rawling 《Hydrogeology Journal》2016,24(4):753-756

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Structure Refinement of Cs-rich Na-Li Beryl and Analysis of Its Typomorphic Characteristics of Configurations     

LIU Yan  DENG Jun  LI Guowu  SHI Guanghai  State Key Laboratory of Geological Processes  Mineral Resources  China University of Geosciences  Beijing Key Laboratory of Lithosphere Tectonics  Lithoprobing Technology of the Ministry of Education  China University of Geosciences  Beijing Laboratory of Single-Crystal X-Ray Diffraction  China University of Geosciences  Beijing 《《地质学报》英文版》2007,81(1):61-67

1 Introduction Natural beryl is an accessory mineral mainly in pegmatite, partly in some highly diffractionated granite or metamorphic rocks, with the crystal shapes beingprismatic, or occasionally tabular. For tabular beryl found in pegmatite it is believed that the tabular configuration is connected with alkali metals (Bieus, 1960; Wang et al., 1981) and geneses of the tabular configuration have been reported before. In recent years, tabular beryl has been found in the Xuebaoding W-Sn-Be d…  相似文献   

Chronology and Geochemistry of Volcanic Rocks in the Cretaceous Suifenhe Formation in Eastern Heilongjiang, China   总被引：3，自引：0，他引：3  

JI Weiqiang  XU Wenliang  YANG Debin  PEI Fuping  JIN Ke  LIU Xiaoming College of Earth Sciences  Jilin University  Changchun  Jilin Bureau of Land  Mineral Resources of Jilin Province  Changchun  Jilin The State Key Laboratory of Continental Dynamics  Northwest University  Xi ''an  Shaanxi 《《地质学报》英文版》2007,81(2):266-277

Zircon U-Pb ages and geochemical data of volcanic rocks in the Suifenhe Formation in eastern Heilongjiang Province are reported, and their petrogenesis is discussed in this paper. The Suifenhe Formation mainly consists of basalt, andesite, and dacite. Zircon from andesite and dacite are euhedral in shape and show typical oscillatory zoning with high Th/U ratios (0.18-0.57), implying its magmatic origin. Zircon U-Pb dating results by laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS) indicate that the 206Pb/238U ages of zircons from andesite range within 105-106 Ma, yielding a weighted mean age of 105.5±0.8 Ma (n=14), and that 206Pb/238U ages of zircons from dacite are between 90-96 Ma, yielding a weighted mean age of 93.2±1.3 Ma (n =13). The volcanic rocks from the Suifenhe Formation are subalkaline series and show a calc-alkaline evolutionary trend with SiO2 content of 47.69%-65.47%, MgO contents of 1.42%-6.80% (Mg#= 45-53), and Na2O/K2O ratios of 1.83-3.63. They are characterized by enrichment in large ion lithophile elements (LILE) and light-rare-earth elements (LREE), depletion in heavy rare earth elements (HREE) and high field strength elements (HFSE) (e.g., Nb, Ta, Ti), and low initial 87Sr/86Sr ratios (0.7041-0.7057) and positiveεNd(t) values (039-4.08), implying that they could be derived from a depleted magma source. Taken together, these results suggest that the primary magma of the volcanic rocks might originate from partial melting of the mantle wedge metasomatized by fluids derived from subducted slab under a tectonic setting of active continental margin.  相似文献   

黔东南新元古界下江群甲路组沉积特征及其下伏岩体的锆石U-Pb年龄意义   总被引：4，自引：0，他引：4  

陈文西 王剑付修根  汪正江熊国庆 《地质论评》2007,53(1):126-131

黔东南地区的甲路组冲洪积相底砾岩为一套高角度不整合于四堡群变质岩系或侵入该变质岩系的花岗岩体之上的楔状地层。通过对该组大比例尺剖面实测与加密取样鉴定,确定了该地区新元古界下江群甲路组与四堡群变质岩系及刚边花岗岩体之间的沉积超覆关系,在此基础上建立了下江群的沉积演化序列。取自甲路组地层之下的花岗岩的高精度SHRIMP锆石U-Pb年龄为823±12Ma,这一年龄数据与已有的摩天岭花岗岩TIMS锆石U-Pb年龄825.0±2.4相一致,代表了黔东南地区裂谷系沉积超覆的起始年龄。而该区裂谷系沉积超覆的开启年龄略晚于这个时间,研究区内可能缺失1000～820Ma之间与拉伸系(Tonian)大致相当的地层。  相似文献   

新疆萨吾尔地区两类花岗岩Nd、Sr、Pb、O同位素特征   总被引：10，自引：0，他引：10  

袁峰  周涛发  杨文平  何立新  范裕  谭绿贵  岳书仓 《地质学报》2006,80(2):264-272

新疆西准噶尔萨吾尔地区森塔斯岩体和沃肯萨拉岩体为I型花岗岩,侵入于早石炭世末,具有偏碱性特点,形成于后碰撞阶段的伸展期或挤压—伸展转变期;阔依塔斯岩体和恰其海岩体为A2型花岗岩,侵入于早二叠世初,形成于后碰撞阶段伸展期张性构造环境中。I型花岗岩和A型花岗岩的Nd、Sr、Pb同位素特征相似,显示出幔源特征,它们是同源岩浆不同演化阶段的产物。两类花岗岩在O同位素以及稀土元素特征上存在明显差异。西准噶尔萨吾尔地区I型花岗岩(森塔斯岩体和沃肯萨拉岩体)以及A型花岗岩(阔依塔斯岩体和恰其海岩体)的发育,进一步证实了晚古生代区内地壳的垂向增生作用。对比研究表明,可以将西准噶尔萨吾尔地区的A型花岗岩归入东准噶尔乌伦古富碱火成岩带。  相似文献