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通过对河南孙坡—管茅铝土矿含矿岩系特征、矿体特征、矿石质量特征、矿石类型及品级等分析研究,并对矿床成因进行了分析,最终提出找矿标志。即主要为中石炭统本溪组含矿岩系、中奥陶统马家沟组灰岩及矿体露头。 相似文献
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根据矿床地质特征、岩矿测试分析,及矿石结构构造研究,对艾沟金矿的成因及控矿进行论证,指出矿体严格受构造控制,矿体属中-低温热液成因。矿石类型为含硫化物石英脉及含重晶石石英脉。最后得出,目前所见的Ⅰ号矿体只不过是矿体的一小部分,最大最富的矿体在构造深部的交会部位。 相似文献
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文章阐述了广西靖西县新圩岩溶堆积型铝土矿含矿岩系、矿体特征及矿体空间分布特征的控制因素,分析了其形成机制,提出了第四纪发生的多次地壳周期性运动使成矿具有明显的多期性。 相似文献
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通过对杉木溪矿区雄黄矿的成矿物质来源、微量元素在地层中的富集与成矿关系、控矿因素、矿体成因的综合分析与研究;结合其矿区地质特征、矿体地质特征,对杉木溪矿区雄黄矿体进行找矿前景分析,为在矿区深部探寻雄黄矿体提供找矿思路。 相似文献
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通过冯家港铝土矿含矿岩系特征、矿体特征、矿石质量特征、矿石类型及品级等分析研究,并对矿床成因分析,最终提出找矿标志。 相似文献
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文章通过对龙滩锑矿的构造特征及矿体赋存富集规律的分析研究,认为断裂构造的级次、形态分别控制着矿体的赋存富集和成矿的阶段性。 相似文献
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通过下徐马-朱村铝土矿含矿岩系特征、矿体特征、矿石质量特征、矿石类型及品级等分析研究,分析矿床成因,最终提出找矿标志. 相似文献
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北江水铜矿床位于鲁西重要的铜多金属成矿带内,在分析区域成矿地质背景和矿床地质特征的基础上,着重从构造、地层、岩浆岩等方面分析了控矿因素和找矿标志。利用矿区内最新施工的钻孔资料及物化探资料,对区内矿体的成矿规律、分布特征进行了全面、系统的分析,认为矿床成因类型属于中低温热液型,铜矿体呈脉状严格受北江水断裂控制。区内铜矿体赋存岩性为黄铜矿化石英脉,矿体侧伏方向为NW 300°,矿体沿侧伏方向富集明显,且深部未封闭。区内NW向断裂是重要的导矿、控矿构造,受断裂构造控制的热液型铜矿床,一般具有延深大于延长的特点。认为该区具有良好的找矿前景,指出了找矿方向为研究区西北部及矿体深部。 相似文献
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王明远 《中国地理科学(英文版)》1993,3(4):376-380
We have made progress in medico-chemical geography as follows: the correlative law of organism with geochemical environment; the geochemico-ecological classification of chemical elements; the types of formative cause of biogeochemical provinces in China; the parabolic correlation between contents of iodine in drinking water and prevalence rate of endemic goiter; the discovery and proof of the low selenium zone in China; the successive discovery of endemic fluorosis of the types of pollution from burning coal, drinking high fluoride tea and high fluoride table salt from the year 1978; the study on chemical geography of schistosomiasis and the compilation of the Atlas of Endemic Diseases and Their Environments in the People's Republic of China. 相似文献
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We used long term monitoring data to evaluate changes in abundance and species dominance of small-jellyfish (collected with zooplankton net whose bell diameter was less than 5 cm) between 1991 and 2009 in the Jiaozhou Bay, China. Zooplankton samples were vertically towed with conical plankton net from near-bottom to surface, identified microscopically, and mapped in time-space using Grapher 7.0 and Surfer 8.0. Results show that the abundance of small-jellyfish throughout the bay had been increasing during 2001-2009 on average of 15.2 ind./m 3 , almost 5 times higher than that between 1991 and 2000. The occurrence of peak abundance shifted from spring to summer after 2000, and two peaks appeared in spring and summer, respectively, after 2005. Both the abundance and the frequency of blooms of small-jellyfish increased after 2000 in the bay. In addition, the biodiversity of jellyfish has increased significantly in recent years with a change in dominant species. Several new dominant species appeared after 2000, including Rathkae octopunctata in winter, Phialidium hemisphaericum in spring, summer, and autumn, Phialucium carolinae in spring, and Pleurobrachia globosa in summer and autumn, while some previous dominant species throughout the 1990s (Eirene ceylonensis, Zanclea costata, Lovenella assimilis, and Muggiaea atlantica) were no longer dominant after 2000. The abundance of small-jellyfish was positively correlated with the density of dinoflagellates, and the abundance of zooplankton. We believe that the changes in smalljellyfish abundance and species composition were the result of eutrophication, aquaculture and coastal construction activities around the bay. Concurrently, seawater warming and salinity decrease in recent decades promoted the growth and reproduction of small-jellyfish in the bay. 相似文献
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随着信息社会的发展,新技术和新媒体的出现必然影响学校现代教育的发展。通过阐述发展学校电化教育的应注意的问题,探讨了解决问题的方法。 相似文献
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刘希林 《中国地理科学(英文版)》1995,5(3):275-287
RECENTDEVELOPMENTSINDEBRISFLOWRESEARCHINITALYMarchiLorenzo;TeccaPiaR.(InstituteforPreventionofHydrologicalandGeologicalHazard... 相似文献