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1.
浪贝儿地区金(锑)矿位于中铁断裂—切木曲断裂一带,两条断裂是区域上对金成矿的最有利的构造,次级构造发育,已发现的金矿化就受该断裂的控制。从地质环境分析,具备了区域上所有对金矿形成有利的地质条件,且已发现较强的矿化蚀变,因此认为该地区是区域上最具找金远景地段之一。  相似文献   

2.
雷山排则锑矿赋存于番召组二段的浅变质碎屑岩中,矿体受区域上的北北东、北东向构造控制,呈陡脉状、透镜状矿化;锑矿化与硅化关系最为密切;矿体就位于背斜和断裂交汇的次级北东向断裂构造中。  相似文献   

3.
黄君振 《大众科技》2008,(6):129-130
对凤凰山银矿地质特征进行总结和分析,认为银矿成矿主要受层位及断裂构造双重因素控制,地层提供了矿源,构造提供了进一步富集的动力条件和成矿空间,在对矿床的地质特征和主要控矿因素分析的基础上,对进一步寻找银矿体的勘查方向进行了探讨。  相似文献   

4.
锡坪钼铜锡矿床属火山——沉积变质热液叠加型矿床和斑岩型矿床,文章从矿床地质特征、不同类型围岩蚀变及成规律的研究,认为围岩蚀变属于岩浆期后热液交代作用形成。受断裂构造带影响,形成不同的蚀变带,对钼铜锡的富集成矿起到了一定的作用。  相似文献   

5.
浅议焦家金矿田构造控矿规律及进一步找矿方向   总被引:1,自引:0,他引:1  
焦家金矿田是我国著名的金矿集中区,在焦家金矿田内,岩体的接触带控制断裂构造,断裂构造控制着金矿床的产出,断裂的产状变化,展布规律控制了矿体的形态、产状和富集规律,受主控矿断裂的控制,矿床表现有等间距性;受次级断裂控制,矿体表现有等间距性,斜列性,侧伏性,侧列性等规律据此,推测焦家金矿田的北段和南段仍有较好的找矿远景。  相似文献   

6.
龙山煤矿总体为一向斜——龙山向斜,井田内断裂、褶曲均较发育,本文围绕地质构造与煤矿安全生成的关系进行分析与研究,阐述地质构造对煤矿安全生产中各种因素的影响,为煤矿安全生产提供依据。  相似文献   

7.
邢静 《内江科技》2012,(3):51+60
东辛浅层勘探范围包括东营穹窿背斜构造和辛镇长轴背斜构造以及二者接合部。东营构造在平面上表现为放射状和环状断裂体系,辛镇构造是被两条二级断层切割,近东西向长条状的地堑。该区断层活动时间长,在油气大规模运移的馆陶-明化镇组沉积时期,深部油气通过断层、不整合面、储集层运移到浅层,聚集成藏。该区浅层成藏受宏观构造背景控制,大的油源断层附近油气易于富集,尤以反向屋脊断块最为有利,局部受岩性控制。断裂组合制约油气富集程度。实践证明,东辛浅层具有很大潜力。  相似文献   

8.
小南沟-通峪沟金矿区是中国黄金总公司嵩县金牛公司重要采矿区之一,矿区位于华北地台、华熊台隆南侧的区域性壳幔型深大断裂-马超营大断裂北侧的万岭断裂组内,是一受断裂、岩浆活动和蚀变带控制的蚀变岩型金矿床。矿体严格受断裂破碎带控制,F59断裂破碎带为主要导矿、次级断裂带为容矿构造。金的富集主要是由岩浆及构造多次叠加及热液蚀变、强烈糜棱岩化形成的。对矿床地质特征及控矿因素的研究表明,今后找矿的重点应在F39一级导矿及其旁侧的二级容矿断裂破碎带及其周边5KM的热变质圈内和化探异常发育地段。  相似文献   

9.
杜文  张霄宇  葛冰 《科技通报》2019,35(11):193-200,213
锑是一个可长距离输送的全球性有毒元素,但锑在河口不同环境要素中的迁移、转化以及其地球化学行为特征最近才引起国际社会的关注。为了揭示锑元素在长江口及其邻近海域的富集程度、物质来源及其潜在生态环境影响,本次研究以长江口及邻近海域29. 5°~32. 5°N,121°~124. 5°E区域内表层沉积物样品为研究对象,基于沉积物全样Al、Ca、Si、Ni等主量元素,以及Cd、Cr、Cu、Pb、Sb、Sr、Zn等微量元素的含量检测分析,并采用地积累指数和潜在生态风险指数展开了锑元素在研究海域表层沉积物中累积程度和潜在生态风险。研究结果表明研究区内表层沉积物中的锑含量范围为0. 44~4. 41μg/g,平均值为1. 15μg/g;已达到了偏中度污染水平,并且具有着较高的潜在生态风险,尤其是在长江入海口南支与杭州湾内锑元素具有很高的潜在生态风险。通过主成分分析方法认为锑元素的主要物质来源为长江径流输入以及人为活动输入。  相似文献   

10.
熊建军 《科技风》2013,(12):6-7
采用"熔炼富集"工艺处理转炉渣,工业试验结果表明:在还原气氛下,在1100~1200℃熔炼富集转炉渣是可行的,熔炼金属产出率在40~50%左右,有价金属基本富集在合金中,富集2.5倍左右。铜、铅和锑的回收率在95%左右,铟的回收率在90%以上,锡的回收率75~80%。  相似文献   

11.
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said.  相似文献   

12.
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China's science enterprise by making S&T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party's Leading-member Group at CAS, which was held from 7 to 11 January in Beijing.  相似文献   

13.
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.  相似文献   

14.
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants."  相似文献   

15.
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.  相似文献   

16.
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction.  相似文献   

17.
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.  相似文献   

18.
Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.  相似文献   

19.
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment.  相似文献   

20.
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.  相似文献   

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