物理守恒律保真全球谱模式辐射—云—对流过程的改进

辐射—云一对流相互作用的正确和合理描述是改进湿物理过程描述和数值模式的重要方面.在一个物理守恒律保真的全球模式中引入描述更细致的云参数化方案和辐射参数化方案,对6个30天实时资料数值积分进行分析.结果表明,通过云参数化方案中云描述的细化,改进了模式对云分布、云量、以及云水、云冰不同相态的模拟;辐射方案中对这些云水物质的...     

河南省全新世环境演变研究概述

对全新世以来河南省环境演变研究进行了综述,勾勒了河南省近一万年来环境演变历史的总体轮廓.鉴于本地区相关研究的现状,未来应着重加强以下几个方面的研究:应加强对全新世气候演变机制的研究,尤其是气候突变事件的控制机制的研究;在研究手段上,应加强代用指标记录气候变化的机理研究和高分辨率、多指标的综合对比研究,以期定量/半定量的...     

西南大面积低温成矿域：研究意义、历史及新进展

我国西南大面积低温成矿域是目前世界上公认的2个大面积低温成矿域之一,其面积之大（约100万km^2）、包含的矿种之多（Au、Hg、sb、As、P、Pb—Zn、Ag以及萤石、冰洲石、水晶、分散元素等）、矿床组成和组合之复杂全球罕见,是我国重要的Au、Hg、sb、As、Pb—zn、Ag以及多种分散元素生产基地。国内外学者对该成矿域进行了近30年的研究工作,取得了大量高水平研究成果,同时也存在许多有待深人研究的科学问题。本文回顾了我国西南大面积低温成矿域的研究历史,总结了各研究阶段的主要研究内容、主要研究成果和存在的主要科学问题,同时介绍了近年来我国西南大面积低温成矿域研究新进展。     

辽西建昌碱性粗面岩的年代学及岩石成因研究

义县组火山岩在辽话分布广泛,研究区碱性粗面岩位于建昌地区义县组火山岩的顶部,详细的年代学及地球化学研究表明,锆石u—Pb年龄为（120．3±1．5）Ma,具有较高的SiO2：和碱含量,ω（SiO2）=63．52％～65．94％,ω（Na20＋K2O）=9．63％一10．15％,ω（Na20）／ω（K20）为0．96～1．08,属于高钾碱性岩系列,同时具有较低的ω（MgO）（0．75％～1．05％）,稀土配分模式为轻稀土富集,重稀土亏损的右倾型模式（La／Yb）n=8．96～12．02）,较弱的正Eu异常（δEu=1．07—1．16）,相容元素Cr（1．46×10^6～4．15X10^6）、c0（19．8X10^6。～45．9X10^6）和Ni（0．100x10^6～1．55×10^6）含量低。微量元素蛛网图显示明显的Ba和Pb正异常,以及Sr、Ti和Y负异常,此外,zr和Hf显示一定的正异常。认为碱性岩形成于拉张的构造环境,且来源深度较大,是壳幔相互作用的结果,研究区火山岩是经过强烈橄榄石、斜方辉石和单斜辉石结晶分异的富集地幔岩浆上升底侵至下地壳,并经历同化混染和部分熔融,然后沿着深大断裂喷发至地表。     

Anomalous Signals Prior to Wenchuan Earthquake Detected by Superconducting Gravimeter and Broadband Seismometers Records

Using 1 Hz sampling records at one superconducting gravimeter(SG) station and 11 broadband seismometer stations,we found anomalous signals prior to the 2008 Wenchuan(汶川) earthquake event.The tides are removed from the original SG records to obtain the gravity residuals.Applying the Hilbert-Huang transform(HHT) and the wavelet analysis to the SG gravity residuals leads to time-frequency spectra,which suggests that there is an anomalous signal series around 39 h prior to the event.The period and the magnitude...     

最可靠的非开挖地下岩体结构勘察方法——高精度超声波钻孔成像

主要通过超声成像测井在长江某穿越工程区勘察工程中的应用研究,类比常规勘察技术和其他钻孔成像技术,并结合超声测井在国内其他方面的案例,剖析新一代超声测井仪的优势所在：如在基岩风化带的描述、岩石质量指标RQD分析,特别是地下岩体裂隙、节理等地质结构信息的精确揭露上,具备其他勘察手段无法比拟的优势,可以提供大量有效可视的钻孔岩体定量数据,为工程设计的定量化分析提供了详细的数据资料。可以说在揭露地下岩体结构方面,高精度超声测井是目前为止最为有效可靠的手段。     

塔里木盆地上泥盆统一下石炭统东河砂岩沉积相与哈得逊油田的发现

哈得逊油田是塔里木盆地最大的整装油田之一,储量规模超过亿吨.在其发现过程中,东河砂岩的沉积相及其相变规律起了重要的指导作用.东河砂岩为晚泥盆世晚期至早石炭世早期海侵背景下沉积的一套海侵砂(砾)岩,主体为滨岸海滩相砂体,在全盆地范围内是一个明显的穿时沉积体.东河砂岩从古地貌低部位向高部位持续超覆变薄,以陆源碎屑滨岸-浅海...     

http://www.sciencedirect.com/science/article/pii/S1674987110000320

The self-similar is a common phenomena arising in the field of geology.It has been shown that geochemical element data,mineral deposits,and spacial distribution conform to a fractal structure.A fractal distribution requires that the number of objects larger than a specified size have a power-law dependence on size.This paper shows that a number of distributions,including power-function,Pareto, lognormal,and Zipf,display fractal properties under certain conditions and that this may be used as the mathemat...     

Otolith chemical signatures of spottedtail goby Synechogobius ommaturus in coastal waters of China

This study explores the potential existence of local stocks of Synechogobius ommaturus using otolith chemical signatures. The concentrations of 10 elements (K, Ca, Na, Mg, Sr, Pb, Ba, Mn, Co, Zn) in the otoliths from eight stocks (Dandong, Dalian, Tianjin, Dongying, Weihai, Qingdao, Ganyu and Xiamen) of S. ommaturus were measured by Inductively Coupled Plasma Mass Spectrometry and regressed against otolith weight. No significant correlation between otolith weight and concentrations of Na, Mg, Ca, Sr, Co, Ba, Zn and Pb were observed. Concentrations of K and Mn were correlated with otolith weight. Consequently, the residuals of the regressions were used instead of the original concentrations in subsequent analyses. Analysis of variance (ANOVA) showed no significant difference between males and females in otolith chemical signatures. Differences were found among the locations for K, Sr, Mn, Co, Ba, Pb, but not for Ca, Na, Mg and Zn. Residuals of the regressions of elemental concentrations against otolith weight that fitted the normal distribution and homogeneity were studied by discriminant analysis. The success of the discriminant function to predict the location of S. ommaturus capture ranged from 100% for Weihai and Xiamen stocks, to only 44.4% and 62.5% for Qingdao and Dandong stocks, respectively. The average prediction success was 80.3%.