中国火成岩化学元素的丰度与分布   总被引：19，自引：3，他引：19  

鄢明才  迟清华 《地球化学》1996,25(5):409-424

在中国各构造单元构选采了１０３６４件火成岩样品合成１１３１个分析样，采用仪器中子活化法，Ｘ射线荧光光谱法，原子吸收法，原子荧光光谱法，催化波极谱法和分光光度法等１５种可靠分析方法进行测试，对一些难测痕量元素采用了最新的分析研究成果，以同类国家一级标准物质监控分析质量。  相似文献   

Chemical composition of upper crust in eastern China   总被引：4，自引：0，他引：4  

Mingcai Yan  Qinghua Chi  Tiexin Gu  Chunshu Wang 《中国科学D辑(英文版)》1997,40(5):530-539

In an area of 3.3×10⁶ km² within eastern China, 28 253 rock samples were collected systematically and combined into 2718 composite samples which were analyzed by 15 reliable methods using national preliminary certified reference materials (CRMs) for data quality monitoring. The average chemical compositions of the exposed crust, the sedimentary cover and the exposed basement as well as the upper crust for 76 chemical elements in eastern China are given. A key basic geology projcct supported by Ministry of Geology and Mineral Resources of China.  相似文献   

中国近海海面地形的计算与研究   总被引：3，自引：1，他引：3       下载免费PDF全文

翟国君  赵明才 《水科学进展》1993,4(3):161-170

介绍了海面地形的研究现状,并根据几何水准求得了中国近海的海平面倾斜及其精度.给出应用水文资料计算中国近海海面地形的公式及其计算结果.探讨了由球函数模型计算中国近海海面地形的理论和方法,并对不同方法进行了比较,得出了一些有益的结论.  相似文献   

地质标准物质的回顾与展望   总被引：8，自引：0，他引：8  

鄢明才  王春书 《物探与化探》1995,19(2):96-103

我国地质物料化学成分标准物质的研究始于七十年代的后期.地矿部西北地质研究所等首先研制了超基性岩和铬铁矿标准物质,继后由物化探研究所和岩矿测试研究所牵头,在区域化探全国扫面的推动下,先后研制了水系沉积物、土壤和岩石三个系列标准物质.稍后核工业部、冶金部和化工部也着手研制了相应专业的地质标准物质.八十年代是地质标准物质研制的全盛时期,在这个阶段之后地质标准物质基本上形成了比较完整的体系.根据1992年国家技术监督局公布的国家一级标准物质目录^[1],在样品数量上冶金类标准物质居第一位,地质类标准物质居第二位,约占四分之一;依发布的标准值项目数计^[2],地质类标准物质居于首位,占50%以上.我国地质标准物质与外国相比,在数量、品种类型和系列性方面均占世界领先地位,在定值的元素和定值精度方面亦为国际先进水平.  相似文献   

深反射地震资料处理和解释的初步研究   总被引：3，自引：0，他引：3  

徐明才  高景华  胡振远 《物探与化探》1995,19(5):360-365,367,368

深反射地震资料处理的关键是从干扰背景中提取和增强深层弱有效信号,提高剖面的信噪比和分辨率.深反射地震剖面的解释要着眼于大的地质构造运动和成因,运用地质规律进行综合地质解释.在解释中,通过分析和研究某些相干干扰波的形成和特点,有助于对深反射地震剖面进行可靠的地质推断解释.  相似文献   

宝兴县城堤防工程灌注桩施工中的几个问题     

唐明才 《四川地质学报》2002,22(Z1):63-64

介绍在宝兴县城堤防灌注桩工程施工中，如何解决孔轴线倾斜、卡钻、坍孔、导管堵塞等技术难题。  相似文献   

Platinum-Group Element Geochemical Certified Reference Materials (GPt1-7)   总被引：2，自引：0，他引：2  

Mingcai Yan  Chunshu Wang  Tiexin Gu  Qinghua Chi  Zhong Zhang 《Geostandards and Geoanalytical Research》1998,22(2):235-246

Unlike the situation for other elements, few reference materials certified for the platinum-group elements are currently available. Therefore, the GPt1-7 series of PGE geochemical CRMs, prepared by the IGGE, represent an important addition and comprise a range of matrix types, including a soil, stream sediment, Mg-rich ultramafic rock, Fe-rich ultramafic rock, platinoid ore depleted in Cu, Ni and Fe, and a chromitite. The concentration of PGE in these samples ranges over 4-5 orders of magnitude and the samples were shown to have good homogeneity as assessed by a variance test. Analytical methods based on different principles were used in sample certification, including several fire assay and wet chemical procedures used for decomposition and preconcentration. Certified values for the elements Pt, Pd, Os, Ru, Ir, Rh and Au were determined by AAS, catalytic colourimetry (COL), catalytic polarography (POL), atomic emission spectrometry (AES), ICP-MS and NAA. Recently, the GPt1-7 samples were approved as national primary CRMs by the State Bureau of Technical Supervision of China.  相似文献   

环渤海地区1961—2007年极端强降水时空变化特征   总被引：2，自引：0，他引：2  

郭军  李明财  段丽瑶 《气候变化研究进展》2010,6(5):319-324

20世纪90年代以来,环渤海地区降水总量持续偏少,极端强降水和干旱缺水问题十分突出。利用环渤海地区60个台站1961—2007年逐日降水资料,应用百分位方法确定极端强降水阈值,分析了极端强降水量、降水强度和频率的空间分布及时间变化趋势。结果表明:环渤海地区极端降水强度大、频率高的地区与年降水量高值区相一致,说明极端降水量的多少影响年降水量;极端降水日数呈减少趋势,特别是京津冀中部地区减少显著;极端降水多发生在7月中旬到8月中旬,最高频次在7月下旬,近10年极端降水季节分配比较分散,很少出现每候25站次以上的极端强降水;间隔30d以上的极端强降水近年来增加明显。  相似文献   

The Sedimentological Knowledge Tree:Significance,Method and Progress     

LI Chao  HU Xiumian  HOU Mingcai  WANG Chengshan  YANG Jianghai  DDE Sedimentary Data Group 《《地质学报》英文版》2019,93(Z1):34-36

正On the platform of the Deep-time Digital Earth Program(DDE),sedimentary data are essential for achieving its scientific objectives.These data will take stratigraphic units as their core data carrier,for quantitative or qualitative data analysis.The DDE Sedimentary Data Group is responsible for the management of the sedimentary data on the DDE platform and has now developed into a group of nearly 40 disciplinary experts.This groups main tasks are constructing sedimentary knowledge  相似文献   

Sedimentological/Palaeogeographic Data as Fundamental Building Blocks of the DDE Project:Critical Underpinning of Reconstructing Deep-time Earth Systems     

MONTA?EZ P. Isabel  HU Xiumian  HOU Mingcai  WANG Chengshan  CHEN Jitao  DDE Sedimentology  Palaeogeography Groups 《《地质学报》英文版》2019,93(Z1):52-54

正1 Introduction Sedimentary rocks archive important information for understanding how the earth system operates and how life and environments have evolved through earth history.Properly identifying characteristics of sedimentary rocks,along with the subsequent interpretation of depositional processes and sedimentary environments in a basin or locality,are fundamental to inter-basinal correlation of sedimentary successions as well as to understanding and deconvolving regional and global processes  相似文献