湘西北地区铅锌矿床成矿规律及找矿方向   总被引：9，自引：2，他引：7  

杨绍祥  余沛然  劳可通 《国土资源导刊(湖南)》2006,3(3):92-98

湘西北地区以盛产层控型低温热卤水铅锌矿床著称。矿床赋存于早寒武世晚期至早奥陶世早期分别受台地边缘相、台前斜坡相和局限台地相控制的碳酸盐地层中。矿体主要呈层状、似层状且具多层性,局部可切层,少数呈脉状。其产出受岩石的原生孔隙和容矿层内构造如虚脱—滑动空间、破碎带及裂隙系统等多因素控制。深大断裂带为主要导矿构造。容矿层不是矿源层,铅锌矿不存在同生沉积特征或痕迹。铅同位素年龄晚于赋矿地层年龄。矿质主要来源于碳酸盐建造以下的一大套碎屑岩建造,部分来自深部和造山带。矿床无围岩蚀变则无铅锌矿化,矿化富集强度与多类型围岩蚀变强度及层内构造空间发育程度呈正相关关系。该地区成矿地质条件优越,在划分出的4个找矿远景区内,许多低工作程度区和找矿空白区里仍具有巨大的找矿潜力,可望找到新的矿床。  相似文献   

河北井陉“雪花山组”的腹足类化石及其地层意义     

李云通  李子舜 《地质学报》1980,54(4)

本文记述了井陉雪花山组的腹足类化石群,共7属,19种,其中7个新种,3个未定种。根据化石群的特点,将雪花山组的时代重新厘定为中新世。  相似文献   

泌阳凹陷北部斜坡带构造特征及油气圈闭有效性   总被引：1，自引：0，他引：1       下载免费PDF全文

钟俊义  李桂林  葛辉  丁艳红  吴跃通 《地质找矿论丛》2003,18(3):149-154

泌阳凹陷北部斜坡带断裂极为发育，主要发育NE向和NWW向两组正断层。NE向断层断距大，延伸距离远；NWW向断层断距相对较小，延伸较短。斜坡带由于构造破碎，断层发育，圈闭类型多为断块、断鼻及断层 岩性复合型圈闭。因此，对北部斜坡带断层的展布和交切规律的研究，是识别该区圈闭的关键。  相似文献   

层序地层学研究及隐蔽油气藏预测--以南阳凹陷古近系为例   总被引：2，自引：0，他引：2  

程学峰  于群达  吴跃通  孙峥嵘  杨春红 《新疆地质》2003,21(2):206-209

高精度层序地层学已被证明是寻找隐蔽圈闭行之有效的理论方法．运用该理论对南阳凹陷进行了研究，对地震剖面中反射界面的追踪，在古近系中识别出了各级别的层序界面，结合周缘露头、钻井、测井等资料，分析了主要目的层序内体系域的构成及高频单元变化规律，建立了层序地层模式，在此基础上预测南部陡崖式断坡带和北部缓坡式弯折带是低位域砂体和隐蔽岩性油气藏形成的有利区带．  相似文献   

截渗墙(防渗墙)质量检测技术研究进展     

冷元宝  黄建通  王锐  朱文仲 《地球物理学进展》2003,18(3):404-409

截渗墙是堤坝整治的重要手段，但由于截渗墙施工质量不易控制，并且具有隐蔽性等特点，截渗墙的质量检测非常重要且存在不小的难度。本文首先简要介绍了近年来得到研究与实践的一些截渗墙质量检测技术，并对各种检测技术的特点进行了分析，最后推荐了截渗墙(防渗墙)质量检测的技术方案。  相似文献   

广东茂名地区二叠以状硅质岩成因地球化学特征及其沉积环境意义   总被引：2，自引：0，他引：2  

徐跃通 《西安地质学院学报》1997,19(3):27-33

在广东茂名地区二叠系地层中存在地导整合产生的层状硅质岩。硅质岩富Ｆｅ，Ｍｎ，相对贫Ａｌ；富集Ａｓ，Ｓｂ，Ｂｉ，Ｇａ等微量元素，稀土元素总量低，Ｃｅ弱负异常，重稀土相对富集，δ＾３０Ｓｉ值变化范围为０．０００３～０．０００７，。δ＾１８Ｏ值变化范围为０．０１４８～０．０２２３，均具热水沉积硅质岩的地球化学特征，在Ａｌ－Ｆｅ－Ｍｎ－（Ｎｉ＋Ｃｏ＋Ｃｕ）三角图上，本区硅质岩均属于典型的热水积硅质岩，硅质  相似文献   

THE LIMITATION OF CLOUD-BASE MASS FLUX IN CUMULUS PARAMETERIZATION AND ITS APPLICATION IN A HIGH-RESOLUTION MODEL     

徐道生  陈子通  钟水新  温焰军  谢东东 《热带气象学报(英文版)》2015,21(S1):11-22

A large area of unrealized precipitation is produced with the standard convective parameterization scheme in a high-resolution model, while subgrid-scale convection that cannot be explicitly resolved is omitted without convective parameterization. A modified version of the convection scheme with limited mass flux at cloud base is introduced into a south-China regional high-resolution model to alleviate these problems. A strong convection case and a weak convection case are selected to analyze the influence of limited cloud-base mass flux on precipitation forecast. The sensitivity of different limitation on mass flux at cloud base is also discussed. It is found that using instability energy closure for Simplified Arakawa- Schubert Scheme will produce better precipitation forecast than the primary closure based on quasi-equilibrium assumption. The influence of the convection scheme is dependent on the upper limit of mass flux at cloud base. The total rain amount is not so sensitive to the limitation of mass flux in the strong convection case as in the weak one. From the comparison of two different methods for limiting the cloud-base mass flux, it is found that shutting down the cumulus parameterization scheme completely when the cloud-base mass flux exceeds a given limitation is more suitable for the forecast of precipitation.  相似文献   

水生动物来源的抗肿瘤活性肽作用机制研究进展   总被引：1，自引：0，他引：1  

张永进  林琳  姜绍通  陆剑锋 《海洋科学》2015,39(8):116-124

<正>生物活性肽能调节人体多种生理功能,有提高免疫、抗肿瘤、抗病毒和降血压等作用,而且肽类物质的结构类型十分丰富,有巨大的药物活性筛选潜力,是当前国际药品与保健品界最热门的研究对象和极具发展前景的功能因子[1]。在中国,生物活性肽开发利用的研究起步较晚,易杨华等[2]从棕色扁海绵(Phakellia fusca)中获得一个具有较好抗肿瘤活性的新型类环七肽的phakellistatin(Pro-Gly-Phe-ProTrp-Leu-Thr),这也是首次从产于中国海域的  相似文献   

Verification and Assessment of Real-time Forecasts of Two Extreme Heavy Rain Events in Zhengzhou by Operational NWP Models     

钟水新  庄妍  胡胜  陈子通  丁伟钰  冯业荣  邓涛  刘显通  张艳霞  徐道生  戴光丰  蒙伟光 《热带气象学报(英文版)》2021,27(4):406-417

In the present study, the performances of the NWP models on two heavy rainfalls on 20 July and 22 August 2021 over Henan Province were investigated. The impacts of the water vapor transport to the extreme rainfall were further discussed. The results showed that the regional model system in the Guangzhou Meteorological Service generally showed high scores on the extreme rainfall over Henan. The maximum 24h accumulative rainfall by the 24h forecasts by the CMA-GD reached 556 mm over Henan Province. The 24-h and 48-h Threat Score (TS) of heavy rainfall reached 0.56 and 0.64. The comparisons of the Fraction Skill Score (FSS) verifications of the heavy rainfall by CMA-GD and CMA-TRAMS at the radium of 40km reached 0.96 and 0.87. The water vapor transport to the extreme rainfall showed that the vertically integrated water vapor transport (IVT) of the whole layer before the occurrence of the heavy rainfall exhibited a double-eyes distribution in case 7 · 20. The north eye over Henan reached the same magnitude of IVT as the typhoon eye (Cempaka) over south China. The IVT over the lower troposphere (<500 hPa) showed an overwhelming magnitude than the upper level, especially in the planetary boundary layer (<700 hPa). More practical technical needs to be developed to improve its performances on the forecasting of extreme rainfall, as well as more experiments need to be conducted to examine the effects of the specific terrain and physical schemes on the extreme rainfall.  相似文献   

Assimilation of Polarimetric Radar Data Using an Ensemble Kalman Filter for the Analysis and Forecast of Tropical Storm Ewiniar     

黎慧琦  刘显通  肖辉  万齐林 《热带气象学报(英文版)》2021,27(2):94-108

This study explores the potential for directly assimilating polarimetric radar data (including reflectivity Z and differential reflectivity ZDR) using an ensemble Kalman filter (EnKF) based on the Weather Research and Forecasting (WRF) model to improve analysis and forecast of Tropical Storm Ewiniar (2018). Ewiniar weakened but brought about heavy rainfall over Guangdong, China after its final landfall. Two experiments are performed, one assimilating only Z and the other assimilating both Z and ZDR. Assimilation of ZDR together with Z effectively modifies hydrometeor fields, and improves the intensity, shape and position of rainbands. Forecast of 24-hour extraordinary rainfall ≥250 mm is significantly improved. Improvement can also be seen in the wind fields because of cross-variable covariance. The current study shows the possibility of applying polarimetric radar data to improve forecasting of tropical cyclones, which deserves more researches in the future.  相似文献