红旗营子群研究——冀北铅锌银矿床的矿源层   总被引：2，自引：0，他引：2  

任耀武 《华北地质矿产杂志》1997,12(1):44-51

红旗营子群主要分布于康保－赤峰深断裂以南，尚义－平泉深断裂以北，大致相当于内蒙地轴范围内，冀北主要铅锌银矿床均分布于该地层中，本文主要论述了作为矿源导的红旗营子群岩石学、地球化学及成矿地质特征，据此提出了“三位一体”找矿标志。  相似文献   

Thermodynamic Modelling of Ore-Forming Mechanism of the Changkeng Gold-Silver Deposits in Guangdong Province     

Zhang Sheng  Li Tongjin  Wang LiankuiGuangzhou Institute of Geochemistry  Chinese Academy of SciencesWushan  Guangzhou 《《地质学报》英文版》1997,71(4):433-445

The Changkeng gold-silver deposits consist of a sediment-hosted, disseminated gold deposit and a replacement-type silver deposit. The mineralizations of gold and silver are zoned and closely related to the silicification of carbonate and clastic rocks, so that siliceous ores dominate in the deposit. The mineralizing temperature ranges mainly from 300 to 170℃, and K+, Na+, Ca2+, Mg2+, and Cl- are the major ions in the ore-forming fluid. Calculations of distribution of metal complexes show that gold is mainly transported by hydrosulphide complexes, but chloride complexes of silver, iron, lead, and zinc, which are transformed into hydroxyl and hydrosulphide complexes under neutral to weak-alkaline circumstances in the late stage, predominate in the ore-forming solutions. Water-rock interaction is confirmed to be the effective mechanism for the formation of silver ores by computer modelling of reaction of hydrothermal solution with carbonate rocks. The solubility analyses demonstrate that the precipitation  相似文献   

24位地震数据采集器时间格式转换的实现     

孙宏志  孟凡强  李茂林  王淑辉 《东北地震研究》2004,20(2):44-47

应用C语言编写四字节24位采集器时间编码与七字节时间编码间的相互转换程序，并可在单片机上运行。为24位采集器与计算机和外界设备间建立透明时间编码通道。  相似文献   

多相地貌单元场地勘察中基岩与卵砾石、孤石的鉴别     

沈振  李成旺  沈飞 《城市地质》2004,16(4):26-28

在多相地貌单元场地勘察中，基岩与卵砾石的鉴别难度较大。应利用初步感性认识、钻进状态、岩样特征等多手段对基岩与卵砾石进行判别，以提高判别率。  相似文献   

华南石炭纪岩关-大塘界线期牙形石地层分带   总被引：4，自引：0，他引：4  

田树刚  M.科恩 《地质通报》2004,23(8):737-749

系统采集不同沉积相区和连续沉积的剖面，即浅海台地相广西柳江龙殿山剖面、台缘缓坡相云南施甸鱼硐剖面和台内盆地相广西柳州碰冲剖面，运用数理统计方法，研究了华南岩关一大塘界线过渡期牙形石的产出丰度和相分布，在恢复生物演化序列的基础上，对各剖面首先详细分带，再进一步综合成系统的5个牙形石带，即Gnathodus typicus—G．cuneiformis带、Gnathodus typicus—Protognathodus cordiformis带、Scaliognathus anchoralis—Gnathodus pseu-dosemiglaber带、Gnathodus praebilineatus带和Paragnathodus horrtopunctatus带。以生物系统发生为标准，严格限定各带的界线，并与北美、西欧同期地层进行精确对比，为建立杜内阶一维宪阶界线的全球层型(GSSP)提供可靠依据。  相似文献   

Sedimentary environment and development controls of the hydrocarbon source beds:Middle and Upper Proterozoic in northern North China     

BAO Zhidong  CHEN Jianfa  ZHANG Shuichang  Zhao Hongwen  Zhang qinghai  LI Yan 《中国科学D辑(英文版)》2004,47(Z2)

Problem on development control of marine source bed hold in Chinese petroleum industry progression. The Hongshuizhuang Formation,Tieling Formation and Xiamaling Formation in the Middle and Upper Proterozoic are important hydrocarbon source beds in northern North China, and investigation of their sedimentary environments and the controls has great significance for petroleum exploration in North China. Based on sedimentology (sequence stratigraphy), palaeoecology, sedimentary geochemistry, and sedimentary palaeogeography, their development pattern is discussed. All these studies indicate that the development controls of the hydrocarbon source beds include a favorite palaeogeographic location, exceeding propagation of biomes in low and middle latitudes, anoxic environments, enrichment of phosphorus element and the adsorption of clay minerals during the preservation of organic matter in the marine carbonates.  相似文献   

A hybrid method for size characterization of coarse subsurface fluvial sediments     

Stephen P. Rice  Judith K. Haschenburger 《地球表面变化过程与地形》2004,29(3):373-389

This paper introduces and evaluates a novel method for ascertaining the grain‐size distribution of subsurface sediments that involves profoundly less sampling effort than standard methods. It is based on hybrid sampling principles previously applied to the construction of synthetic surface grain‐size distributions. The method is developed from an empirical demonstration of the approximate similarity of surface and subsurface grain‐size distributions when compared over a common range of sizes. Subsurface hybrid models are found to provide good facsimiles of grain‐size distributions de?ned using standard criteria and to yield distribution percentiles with millimetre accuracy. The technique is presented as an expedient alternative to standard methods for large, perennial gravel‐bed rivers. As this is a new technique, prudent application is advised in lieu of further investigation. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Comparison of hydraulic geometry between sand‐ and gravel‐bed rivers in relation to channel pattern discrimination     

Jiongxin Xu 《地球表面变化过程与地形》2004,29(5):645-657

A comparison has been made between the hydraulic geometry of sand‐ and gravel‐bed rivers, based on data from alluvial rivers around the world. The results indicate a signi?cant difference in hydraulic geometry among sand‐ and gravel‐bed rivers with different channel patterns. On this basis, some diagrams for discrimination of meandering and braided channel patterns have been established. The relationships between channel width and water discharge, between channel depth and water discharge, between width–depth ratio and water discharge and between channel slope and water discharge can all be used for channel pattern discrimination. The relationship between channel width and channel depth can also be used for channel pattern discrimination. However, the accuracy of these relationships for channel pattern discrimination varies, and the depth–discharge relationship is a better discriminator of pattern type than the classic slope–discharge function. The cause for this difference has been explained qualitatively. To predict the development of channel patterns under different natural conditions, the pattern discriminator should be searched on the basis of independent or at least semi‐independent variables. The relationship between stream power and bed material grain size can be used to discriminate channel patterns, which shows a better result than the discriminator using the slope–discharge relationship. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

塔河油田卡拉沙依组砂组沉积相与储层研究     

樊怀阳  陈文  刘百春 《新疆地质》2004,22(4):417-421

卡拉沙依组砂岩是塔河油田石炭系重要储层，从上到下分为4个砂组，即Ⅰ砂组、Ⅱ砂组、Ⅲ砂组及Ⅳ砂组，根据岩石组合特征、岩石粒度、分选性、以及沉积构造等特征，可得出Ⅰ砂组为较典型的扇三角洲沉积环境；Ⅱ-Ⅳ砂组为潮坪环境，其中Ⅲ砂组沉积时的古环境水动力相对最强，以潮间带下部为主，储层砂体最发育，单个砂体的厚度也最大，为纵向上最好储层段。  相似文献   

曲线铁路路基下沉病害检测与分析     

杨新安  陈春安  温国春 《岩土力学》2004,25(9):1397-1400

以阐明曲线铁路路基下沉病害检测、基床强度评估和病害成因分析方法为目标，采用轻便动力触探试验和土工试验方法对沪宁线下行k55 450-k55 500曲线路基下沉病害段进行了试验测试，根据轻便动力触探和土工试验结果，计算出曲线路基基床承载力，与曲线线路路基中总应力进行比较，评估了基床强度状况，分析出该段曲线铁路路基病害产生的成因。  相似文献