从滇黔桂“金三角”区域地层地球化学演化特征探讨卡林型金矿的物质来源   总被引：3，自引：0，他引：3       下载免费PDF全文

周余国  刘继顺  王作华  欧阳玉飞  高启芝  刘德利  黄元有 《地学前缘》2009,16(2):199

选用滇黔桂地区东经103°～110°,北纬22°～26°,面积约20万km2,34幅1∶20万水系沉积物统计结果资料,全面系统地探讨本区及其邻近区域地层地球化学特征及其与成矿的关系。结果表明:(1)与华南地区相比,本区存在Sb、As、Au、Hg等低温元素矿集区的地球化学块体,金具有深源性,而砷、锑、汞则是区域性的高背景,本区金与砷、锑、汞的相伴,既有必然性,又有偶然性;(2)与基性岩浆活动有关的亲基性场元素、氧化物、矿化剂高背景的形成,是本区右江裂谷带、富宁—关岭南北向断裂带、文山—富宁逆冲推覆构造带,特别是峨眉地幔柱所产生的基性岩浆喷溢及火山碎屑浊流沉积的客观地球化学反映;(3)黔西南地区二叠纪峨眉山玄武岩喷发导致二叠系和三叠系金及大量亲基性场元素的突变,右江裂谷活动至少始于寒武纪,随着时间的推移,由桂西往黔西南逐渐裂开;(4)滇黔桂"金三角"地区卡林型金矿的物源与裂谷、特提斯和区域性深大断裂和峨眉地幔柱长期活动相伴的基性火成岩及火山碎屑浊流沉积有关。  相似文献   

中国南极陨石研究新进展          下载免费PDF全文

林杨挺  王道德  欧阳自远 《极地研究》2008,20(2):81-94

本文对我国南极陨石的收集、分类和研究工作进行了回顾和阶段性的总结。4次格罗夫山考察共发现陨石样品9834块,其中已完成和计划2008年完成分类的陨石共2431块。在正式公布的684块已分类陨石中,鉴定出2块火星陨石、2块灶神星陨石、6块橄辉无球粒陨石、5块中铁陨石、1块橄榄陨铁、1块铁陨石以及10块碳质球粒陨石等特殊样品,并对其中的部分样品开展了深入的研究。建议拓展南极陨石的收集,持续开展陨石的分类工作,并提出我国南极陨石研究的重点方向。  相似文献   

Element geochemistry of weathering profile of dolomitite and its implications for the average chemical composition of the upper-continental crust   总被引：1，自引：0，他引：1  

Hongbing Ji  Ziyuan Ouyang  Shijie Wang  Dequan Zhou 《中国科学D辑(英文版)》2000,43(1):23-35

Geochemical behavior of chemical elements is studied in a dolomitite weathering profile in upland of karst terrain in northern Guizhou. Two stages can be recognized during the process ofin situ weathering of dolomitite: the stage of sedentary accumulation of leaching residue of dolomitite and the stage of chemical weathering evolution of sedentary soil. Ni, Cr, Mo, W and Ti are the least mobile elements with reference to Al. The geochemical behavior of REE is similar to that observed in weathering of other types of rocks. Fractionation of REE is noticed during weathering, and the two layers of REE enrichments are thought to result from downward movement of the weathering front in response to changes in the environment. It is considered that the chemistry of the upper part of the profile, which was more intensively weathered, is representative of the mobile components of the upper curst at the time the dolomitite was formed, while the less weathered lower profile is chemically representative of the immobile constitution. Like glacial till and loess, the “insoluble” materials in carbonate rocks originating from chemical sedimentation may also provide valuable information about the average chemical composition of the upper continental crust.  相似文献   

Ionospheric Ne disturbances before 2007 Pu’er,Yunnan, China,earthquake     

欧阳新艳  张学民  申旭辉  刘静  钱家栋  蔡晋安  赵庶凡 《地震学报(英文版)》2008,21(4):425-437

Selecting three half orbits near the epicenter of Pu’er earthquake, we analyzed the Ne data recorded in their revis-ited orbits during a year before this earthquake, and extracted Ne precursors. The results show that: ① There are significant seasonal variations of ionospheric Ne in night time, which exhibit different shapes respectively in four seasons; ② There are three main shapes of Ne: single-peak, saddle-shaped and even-shaped, all of which may oc-cur in four seasons, but each season with its typical shape relatively; ③ Spatial images of Ne showed high values near the epicenter in 30 days before the earthquake, and there is a good correlation between anomaly and distribu-tion of earthquake in space and time, which reflects that these spatial anomalies were indeed concerned with the earthquake; ④There shows a certain similarity of the Ne curves among revisited orbits, which can provide back-ground information for distinguishing and identification of seismic anomaly.  相似文献   

汶川8级地震前的空间电离层异常现象     

张学民  申旭辉  蔡晋安  欧阳新艳  黄建平  刘静  赵庶凡 《国际地震动态》2008,(11)

基于四川汶川8级地震前震中上空DEMETER卫星记录VLF电场频谱数据,利用重访轨道分析了固定纬度点记录的VLF电场信号的背景频谱变化,发现每年的1～6月各频谱变化比较稳定,人工源VLF信号与其他频谱值的幅度相比也清晰可辨,但7～10月扰动比较剧烈,存在整体抬升上升或者快速下降现象,而且人工源VLF信号比较模糊,难以识别.  相似文献   

变质矿物生长的局部平衡体系——以贺兰山北段孔兹岩系为例   总被引：1，自引：0，他引：1  

刘建忠  卢良兆  李铁胜  欧阳自远 《矿物学报》2000,(1)

贺兰山北段孔兹岩系详细的岩石学和矿物学的研究表明 ,岩石中的特征变质矿物如石榴子石、堇青石等的成分与其周围相邻的同世代变质矿物具有很好的相关性 ,而与其寄生主岩成分的相关性较小 ,而贯通矿物如斜长石却与其寄生主岩成分的相关性较为密切 ,同时天然块状样品的脱水熔融实验的结果也显示 ,变质反应是在一个局部平衡体系中进行的。说明在变质作用过程中 ,变质反应的进行以及新矿物的形成是在一个局部平衡的体系下完成的 ,因此在矿物对温压计的使用上 ,应利用处于平衡状态的相邻变质矿物来计算。  相似文献   

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欧阳祖熙 《大地测量与地球动力学》2013,33(1):153-156

?????RZB??????????????????????????????????????????????в?????????????????????????????????????λ?????????????????λ??????????????RZB??????????????????????????????е????????????????????????????????淶??????????????????λ????????????REMA??????????????????λ???????????????????????????????????????±??????????????????  相似文献   

Relationships Between Water Table and Model Simulated ET     

Priyantha Jayakody  Prem B. Parajuli  Gretchen F. Sassenrath  Ying Ouyang 《Ground water》2014,52(2):303-310

This research was conducted to develop relationships among evapotranspiration (ET), percolation (PERC), groundwater discharge to the stream (GWQ), and water table fluctuations through a modeling approach. The Soil and Water Assessment Tool (SWAT) hydrologic and crop models were applied in the Big Sunflower River watershed (BSRW; 7660 km²) within the Yazoo River Basin of the Lower Mississippi River alluvial plain. Results of this study showed good to very good model performances with the coefficient of determination (R²) and Nash‐Sutcliffe efficiency (NSE) index from 0.4 to 0.9, respectively, during both hydrologic and crop model calibration and validation. An empirical relationship between ET, PERC, GWQ, and water table fluctuations was able to predict 64% of the water table variation of the alluvial plain in this study. Thematic maps were developed to identify areas with overuse of groundwater, which can help watershed managers to develop water resource programs.  相似文献   

Erratum to: Schumann resonance observation in China and anomalous disturbance possibly associated with Tohoku M9.0 earthquake          下载免费PDF全文

Xinyan Ouyang  Xuemin Zhang  A. P. Nickolaenko  M. Hayakawa  Xuhui Shen  Yuanqing Miao 《地震科学（英文版）》2014,27(3):353-353

  相似文献   

Erratum to:Schumann resonance observation in China and anomalous disturbance possibly associated with Tohoku M9.0 earthquake     

Xinyan Ouyang  Xuemin Zhang  A.P.Nickolaenko  M.Hayakawa  Xuhui Shen  Yuanqing Miao 《地震学报(英文版)》2014,(3)

正Erratum to:Earthq Sci(2013)26(2):137–145DOI 10.1007/s11589-013-0009-0In the published article,first author’s name was misspelt.The correct name appears in this erratum.  相似文献