The Sequence Architecture of Volcanic Basin Fillings- An Example From Xujiaweizi Faulted Depression In Songliao Basin     

Cheng Rihui  LIU Wanzhu  SHAN Xuanlong  WANG Pujun  CHEN Shumin  QU Yongbao 《世界地质(英文版)》2001,4(2)

The basin filling geometric pattern of volcanic eruptive rocks depends on both of the eruptive locations in a basin and structural styles of fault terraces. It is divided into three types by eruptive locations and occurrences of eruptive rocks, including the pattern of eruption along fault and occurrence (PEAFO), the pattern of eruption on footwall of a fault and occurrence (PEOFO) and the pattern of eruption on hangingwall of fault and occurrence (PEOHO) in Xujiaweizi fault depression of Songliao basin, Northeast of China. Those basin filling patterns of volcanic eruptive rocks are of specific geometric characteristics controlling or affecting sedimentation, geometry of sedimentary body and sequence architecture during a sequence evolution. The study shows that the volcanic rocks developed at different stages of lowstand, transgressive and highstand can give different controls or affects on the sequence architecture.  相似文献   

Simulating the impacts of climate variation and land-cover changes on basin hydrology: A case study of the Suomo basin   总被引：3，自引：0，他引：3  

CHEN Junfeng    LI Xiubin & ZHANG Ming . Institute of Remote Sensing & GIS  Peking University  Beijing  China  . Institute of Geographical Sciences  Natural Resources Research  Chinese Academy of Sciences  Beijing  China 《中国科学D辑(英文版)》2005,48(9):1501-1509

1 Motivation In the summer of 1998, areas along the middle and lower reaches of the Yangtze River suffered a damag- ing flood. Causes of the flooding became a hot topic on mass media after the disaster. Deforestation on the upstream areas was widely blamed as the major reason for the flooding. Some scientists, however, disproved the point of view. They believed that the impact of land use and land cover changes (LUCC) was over- stated[1]. Actually, the controversy over forest hydrol- ogy h…  相似文献   

Zr/Rb ratio in the Chinese loess sequences and its implication for changes in the East Asian winter monsoon strength   总被引：2，自引：0，他引：2  

Jun Chen  Yang Chen  Junfeng Ji  Youbin Sun 《Geochimica et cosmochimica acta》2006,70(6):1471-1482

The long-term dust accumulation sequences on the Chinese Loess Plateau (CLP) provide a valuable opportunity to study the evolution of East Asian winter monsoon strength. Grain size of bulk samples of loess deposits, though widely used, is a modified measure of the strength of winter monsoon wind due to modification by post-depositional weathering and pedogenesis. This study proposes a new and reliable geochemical climate proxy that records the variability of the East Asian winter monsoon on the CLP. Six loess-paleosol sections on the Plateau were selected for measuring concentrations of the trace elements Zr and Rb as well as grain size. Variations of the Zr/Rb ratio in all the sections encompassing the last 130 ka display a generally similar pattern to that of mean grain size of bulk samples (MGSB). Though a positive correlation exists between the Zr/Rb ratio and MGSB, the correlation coefficient decreases in southern and eastern sections where intense pedogenesis occurred in the relatively warm and humid climates. Long-term Zr/Rb variation in the Lingtai section exhibits amplitudes and frequencies similar to those in MGSB and the mean grain size of quartz particles (MGSQ, accepted as a more reliable proxy than MGSB) in the upper loess-paleosol sequence over the past 2.6 Ma. However, for the underlying Red Clay formation, in the interval from about 7-2.6 Ma B.P., the MGSB record is relatively stable, whereas both the Zr/Rb ratio and MGSQ show distinct variability and display amplitudes similar to those observed in the overlying loess-paleosol sequence. These results demonstrate that the Zr/Rb ratio reflects original eolian grain size and may serve as a reliable index of the strength of East Asian winter monsoon winds.  相似文献   

Regional fractures and denudation of gold ore deposits in Gangdise block,Tibet: Evidence of Ag/Au values     

Li  Shengrong  Deng  Jun  Hou  Zengqian  Xiao  Run  Yuan  Wanming  Feng  Xiaoliang  Zhao  Zhidan  Shen  Junfeng  Zhou  Su 《中国科学:地球科学(英文版)》2001,44(1):121-127

Mapping with Ag/Au ratios of mineralized rocks and ores as a parameter reveals that the deep fractures in the Gangdise block control the distribution of the high value regions which may represent the shallow zones of strongly mineralized areas. The variance gradient regions with large Ag/Au ratio may represent the boundaries between strongly mineralized areas and weakly mineralized areas. In the middle part of the Gangdise block, gold and silver mineralization centers mainly distribute along the NW extending Coqen-Xigaze region, NE extending Yangbajain region and E-W extending Lhasa-Gongbogyamda region. The gold and silver mineralized rocks and ores may have been slightly denuded in the west of the middle Gangdise block, and the denudation in the east, however, may be stronger. The primary gold and silver prospect in the west may be better than in the east.

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塔克拉玛干沙漠风沙活动强度特征   总被引：22，自引：2，他引：20  

俎瑞平  张克存  屈建军 《地理研究》2005,24(5):699-707

通过风资料的统计和计算,对塔克拉玛干沙漠风沙活动强度特征进行了系统研究。结果表明,塔克拉玛干沙漠年平均风速较小,在沙漠内部年平均风速与温度变化呈现“风热同步”现象;有效起沙风作用时间存在明显区域差异,随着风速等级的增加,其出现的频率相应减少,基本上都集中在6.1～10.0m/s之间;输沙势和最大可能输沙量,除若羌地区外,整个沙漠属于低风能环境,且存在很大区域差异,对输沙贡献最大的风速以9.0～11.0m/s为主。  相似文献   

中国陆相复杂含油气系统的特征   总被引：2，自引：0，他引：2  

瞿辉  张明利 《地质力学学报》2000,6(2):11-16

含油气系统研究是当今石油地质界最为热门的研究课题之一,在油气勘探中日愈发挥重要作用。在中国陆相多旋回族合叠加型盆地背景下的含油气系统多表现为复杂的多源多灶多期生烃和成藏。这种复杂的含油气系统有３个较突出的特点：（１）多源多灶致系统叠置和交叉;（２）多阶段多期生烃、成藏和变动导致多源混生;（３）多个关键时刻。在复杂含油气系统的演化过程中,常有多期大规模的油气运移过程,因上顷研究过程中要重视过程的恢复  相似文献   

The simulated response of dimethylsulfide production in the Arctic Ocean to global warming   总被引：2，自引：0，他引：2  

ALBERT J. GABRIC  BO QU  PATRICIA MATRAI  ANTHONY C. HIRST 《Tellus. Series B, Chemical and physical meteorology》2005,57(5):391-403

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基岩冲刷的数值模拟   总被引：2，自引：0，他引：2       下载免费PDF全文

邓军  许唯临  杨忠超  曲景学 《水科学进展》2005,16(1):47-51

为了探索采用数值模拟的方法来研究基岩冲刷的可行性,对二维散粒体河床的冲刷进行了试验研究,并采用二维k-ε模型,在贴体非正交曲线坐标系中用控制体积法对散粒体河床的冲刷进行了数值模拟,计算的冲坑深度与试验结果符合很好,结果令人满意.选用相同的控制基岩冲刷的参数,对不同下游水垫深度、不同入射流速时基岩冲刷深度的正确模拟说明,在对基岩特性有了充分的了解后,用数值方法来模拟基岩的冲刷过程及估算冲刷深度是合理、可行的.  相似文献   

深基坑降水疏干过程中三维渗流场数值模拟研究   总被引：7，自引：0，他引：7  

骆祖江  刘昌军  瞿成松  罗建军 《水文地质工程地质》2005,32(5):48-53

运用潜水、承压水渗流理论和有限差分法,以及干湿单元、预处理共扼梯度算法,以上海环球金融中心塔楼深基坑降水为依托工程,对深基坑降水的三维非稳定渗流场的计算建模和降水疏干过程进行了数值模拟研究。利用5口井和8口井的群井抽水试验资料,对模型主要参数进行了校正及后继检验计算。在上述基础上对中心基坑水位降至-22m时井的布置方案进行了优化设计,同时分析了深基坑内外渗流场的变化,为深基坑降水设计和施工提供了依据。  相似文献   

湖北红安群的时代：变质花岗质侵入体U－Pb定年提供的制约   总被引：2，自引：0，他引：2       下载免费PDF全文

刘晓春董树文  李三忠薛怀民  刘建民曲 玮 《中国地质》2005,32(1):75-81

湖北红安群的原岩形成时代一直是个有争议的问题。笔者对红安群中两个不同类型的花岗质侵入体进行了锆石U-Pb定年,在位于红安群之下的双峰尖岩体中获得岩浆侵位年龄为(813±6)Ma,在侵入于红安群中的高格岩体获得岩浆侵位年龄为(638±142)Ma,高压变质年龄为(229±22)Ma。结合目前在扬子板块和大别造山带内部获得的一系列新元古代年代学数据,认为红安群变质杂岩中沉积地层的形成时代应限制在825～630Ma之间,是扬子大陆基底在新元古代裂解的产物。这套岩石在印支期(约230Ma)华北与扬子板块碰撞过程中经历了低温高压蓝片岩—榴辉岩相变质作用。  相似文献