南秦岭东段早寒武世黑色岩系金钒成矿特征与找矿方向——以夏家店矿床为例   总被引：3，自引：1，他引：3  

任涛  樊忠平  原莲肖  蒋蕊 《西北地质》2007,40(2):85-94

南秦岭东段广泛分布着寒武系黑色岩系,中村钒矿、银花钒矿、千家坪钒矿等大中型矿床产于其中。夏家店金钒矿床的发现与勘查,揭示钒矿具有鲜明的层控和岩控特征,矿体产在下寒武系水沟口组底部,沉积成矿与寒武系的缺氧事件有关,而金的成矿过程不但受其制约,重要的是受到造山后期构造的叠加形成。在勘查过程中注重综合找矿,北东向的断裂构造与黑色岩系的叠加部位,是找金的有利部位。  相似文献   

镶嵌玉受沁机理与镶嵌工艺的初步探讨     

王荣  冯敏  金普军  俞斐  王昌燧 《岩矿测试》2007,26(2):133-137

利用激光拉曼光谱、X射线衍射、X射线荧光光谱、红外光谱、扫描电镜等现代测试技术分析研究了一件先秦时期青铜器上的镶嵌玉。镶嵌玉表面覆盖的锈蚀产物分析表明，在长期的埋藏过程中，镶嵌玉除受到土壤、地下水等外部环境因素侵蚀外，还受到镶嵌本体——青铜器锈蚀产物侵蚀；通过对镶嵌玉周边以及黏结面的残留物分析，探讨了先秦时期玉器镶嵌铜器的结合工艺。  相似文献   

黑色页岩建造中的金-铜(英文)   总被引：2，自引：0，他引：2  

V. I. Starostin O.V. Yapaskurt 《地学前缘》2007,14(6):245-256

系统分析了岩性、岩相和古地理再造的概化结果以及不同金属矿化的显生宙高碳沉积建造的成因。文中还确定了金和铜矿化富集的决定性因素。  相似文献   

Mineral Components, Texture, and Forming Conditions of Hydrothermal Chimney on the East Pacific Rise at 9°-10°N     

郑建斌  曹志敏  安伟 《中国地质大学学报(英文版)》2007,18(2):128-134

To characterize the hydrothermal processes of East Pacific rise at 9o-10oN, sulfide mineral compositions, textural, and geochemical features of chimney ores were studied using ore microscope, scanning electron microscope, X-ray diffraction analysis, and electron microprobe techniques. Results show that there are three mineral assemblages for the hydrothermal chimney ores, namely: (i) anhydrite marcasite pyrite, (ii) pyrite sphalerite chalcopyrite, and (iii) chalcopyrite bornite digenite covellite. Mineral assemblages, zonational features, and geochemical characteristics of the ore minerals indicate that ore fluid temperature changed from low to high then to low with a maximum temperature up to 400 ℃. The chimney is a typical black smoker. The initial structure of the chimney was formed by the precipitation of anhydrites, and later the sulfides began to precipitate in the inner wall.  相似文献   

Burial Records of Reactive Iron in Cretaceous Black Shales and Oceanic Red Beds from Southern Tibet   总被引：1，自引：0，他引：1       下载免费PDF全文

HUANG Yongjian WANG Chengshan HU Xiumian CHEN Xi 《《地质学报》英文版》2007,81(3):463-469

One of the new directions in the field of Cretaceous research is to elucidate the mechanism of the sedimentary transition from the Cretaceous black shales to oceanic red beds. A chemical sequential extraction method was applied to these two types of rocks from southern Tibet to investigate the burial records of reactive iron. Results indicate that carbonate-associated iron and pyrite are relatively enriched in the black shales, but depleted or absent in red beds. The main feature of the reactive iron in the red beds is relative enrichment of iron oxides （largely hematite）, which occurred during syn-depostion or early diagenesis. The ratio between iron oxides and the total iron indicates an oxygen-enriched environment for red bed deposition. A comparison between the reactive iron burial records and proxies of paleo-productivity suggests that paleo-productivity decreases when the ratio between iron oxides and the total iron increases in the red beds. This phenomenon could imply that the relationship between marine redox and productivity might be one of the reasons for the sedimentary transition from Cretaceous black shale to oceanic red bed deposition.  相似文献   

2005年8月16日天津大暴雨成因分析   总被引：3，自引：4，他引：3  

李云  缪启龙  江吉喜 《气象》2007,33(5):83-88

运用FY-2C卫星资料和由NCEP/NCAR再分析资料计算的多种物理量场,初步分析了2005年8月16日天津大暴雨的成因：此次大暴雨发生在低槽冷锋前部,对流层中层低槽和副热带高压的维持、对流层低层切变线的出现、近地面层冷空气的扩散侵入、对流层中低层强盛的不稳定能量以及充沛而又深厚的水汽等天气条件的有效合理配置,造就了这次历史罕见的大暴雨。降水显著的中尺度特性与中尺度云团相对应。同时,对比分析了15日发生在河北东北部、京津地区的另一个降水较弱、对流天气强的对流云团,结果显示它们形成发展中存在差异,为今后两类天气的预报提供了一些线索。  相似文献   

Noble metals in black shales of the Sukhoi Log gold deposit (East Siberia): evidence from scintillation arc atomic-emission spectrometry     

I.E. Vasil’eva  E.V. Shabanova  E.M. Goryacheva  O.T. Sotskaya  V.A. Labusov  O.A. Nekludov  A.A. Dzyuba 《Russian Geology and Geophysics》2018,59(8):997-1009

Scintillation arc atomic-emission spectrometry (SAES) is used to study noble metals (NM), including Au, Ag, Pt, Pd, Ir, Os, Rh, and Ru, in black shales of the Sukhoi Log gold deposit (Irkutsk Region, Russia), with a focus on NM total contents in samples and on the compositions and sizes of NM-bearing particles. The estimated sizes of gold particles and their distribution are confirmed by results of scanning electron microscopy combined with energy dispersive X-ray microanalysis (SEM-EDX). The SAES results are in satisfactory agreement with earlier SEM-EDX data on NM species but reveal a much greater number and diversity of element associations.  相似文献   

东北黑土地中碳赋存形态分析方法研究     

安帅  陈鉴惠  赵任远  宋丽华 《地质与资源》2021,30(6):716

应用高频红外碳硫仪研究了东北黑土地中碳的赋存形态（全碳、有机碳）,实验优化了样品称样量、纯铁纯钨助熔剂加入量等测试条件.结果表明：当样品称样量在0.05 g、纯铁助熔剂加入量为0.5 g、纯钨助熔剂加入量为1.0 g时,黑土地中碳形态分析测试效果最佳.用该方法对有证土壤标准物质进行分析,结果均在不确定度范围内,测量值与标准值相对误差在-5.00%~+2.69%之间,相对标准偏差（RSD）小于6.29%.应用该方法与地质矿产行业标准方法（DZ/T0279.27-2016）对黑土实际样品进行比较分析,测试结果基本一致,此方法适合东北黑土地中碳的赋存形态分析研究.  相似文献   

东北地区黑土退化地球化学指示与退化强度   总被引：1，自引：0，他引：1  

戴慧敏  刘凯  宋运红  梁帅  张一鹤  刘国栋  杨泽 《地质与资源》2021,29(6):510-517

  相似文献   

东北黑土地地球化学调查研究进展与展望     

翟富荣  梁帅  戴慧敏 《地质与资源》2021,29(6):503

  相似文献