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研究区位于鲁西地区重要的东平—汶上铁矿带西侧,为低缓磁异常区。通过高磁测量、井中三分量磁测、钻探验证等手段,在梁山李官屯附近低缓磁异常区发现铁矿一处,矿床类型为条带状铁建造(BIF)型铁矿。该区下伏地层主要为新太古代泰山岩群山草峪组,岩性为黑云变粒岩,局部夹磁铁石英岩、磁铁角闪石英岩,矿石的主要组成矿物为磁铁矿、黄铁矿、黄铜矿。研究区山草峪组大面积分布,根据成矿时代、赋矿层位、含铁建造及岩石组合,结合成矿规律研究分析,梁山地区的大面积条带状分布的低缓磁异常区是寻找隐伏铁矿体的有利部位。 相似文献
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鲁西地区济宁汶上张楼铁矿床位于著名的汶上东平成矿带,广泛发育前寒武纪条带状铁建造( BIF),赋矿层位为泰山岩群山草峪组,岩性以黑云变粒岩为主,次为黑云角闪片岩,黑云斜长片麻岩、片岩,条带、条纹状磁铁石英岩,BIF与其形成均为新太古代晚期。矿床由4条矿带22个矿体组成,呈层状、似层状、透镜状产出,矿石的矿石矿物主要为磁铁矿,其次为少量的赤铁矿、褐铁矿、黄铁矿等,常见矿石的结构主要为粒状变晶结构,次为鳞片粒状变晶结构。类型归属海相火山沉积变质铁矿床类型中的变质铁硅建造铁矿,即鞍山式铁矿。 相似文献
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苍峄铁矿带是山东省重要的铁矿带之一,已开展了多年的地质勘探工作,但对成矿带缺少总体的地质认识。该文通过分析苍峄成矿带地质背景和矿区地质特征、构造特征、航磁异常特征,总结了成矿规律及找矿远景。研究表明:苍峄铁矿带新太古代泰山岩群山草峪组发育,以黑云变粒岩为主,夹斜长角闪岩、角闪岩、磁铁石英岩、磁铁角闪石英岩,属条带状石英型磁铁矿建造。区内形成了一系列紧密的复式褶皱,自北向南发育太白向斜、石阎背斜、辛庄向斜和后大窑北背斜等。铁矿带具有明显剩余重力高值异常,据此划分了5个铁矿带,分别为Ⅰ,Ⅱ,Ⅲ,Ⅳ,Ⅴ铁矿带,指出成矿带深部和航磁异常边部是新的找矿方向,为该区的找矿工作提供了借鉴。 相似文献
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单县铁矿是近年来在鲁西南地区查明的典型铁矿床之一;该铁矿位于巨厚覆盖层下,其地质特征、地球物理特征、矿床特征和矿体特征等方面均已查明,但成矿时代一直没有精确的定年数据支持。该次研究工作对单县含铁建造中的黑云变粒岩进行锆石SHRIMP U-Pb测年,测年结果显示该含铁建造形成于(2 503±6)Ma、(2 512±6)Ma,属新太古代晚期。通过与鲁西地区相关铁矿地质特征对比研究认为,单县铁矿与苍峄铁矿带、东平-汶上铁矿带的含矿建造相同,其赋矿地层为新太古代泰山岩群山草峪组,均属"苍峄式"沉积变质型铁矿。由于该山草峪组含矿建造在鲁西隆起区内广泛分布,通过对区内地质特征和物探异常的对比进行选区研究,利用单县地区铁矿的勘查经验并选取有效的勘查技术手段,有望在周邻地区的巨厚覆盖层下发现新的铁矿找矿靶区。 相似文献
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小闫庄铁矿位于鲁西苍峄铁矿带中部,属"鞍山式"沉积变质型铁矿床,矿体隐伏于地下90~403m,赋存于新太古代泰山岩群山草峪组地层中。矿床由2个矿体组成,矿体呈鞍状、似层状近平行产出,矿体的展布受石闫背斜控制,走向NW,倾向S或N,倾角33°~52°。含矿岩石为磁铁角闪石英岩及磁铁石英角闪岩,黑云变粒岩与黑云角闪片岩为矿体顶底板围岩,矿石工业类型为需选弱磁性贫铁矿石。在阐述小闫庄铁矿床地质特征基础上,总结出铁矿找矿标志,建立了预测找矿模型,探讨了矿床成因,为区域内寻找同类型铁矿具有一定借鉴意义。 相似文献
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鲁西南单县地区赋存沉积变质型铁矿,近年来,该地区铁矿找矿取得了较大的进展。为了更好地指导区内铁矿勘查工作,通过介绍单县地区铁矿地质特征、地球物理特征,剖析大刘庄铁矿床、龙王庙铁矿的矿床特征,建立找矿标志,并对今后铁矿找矿方向进行研究。单县大刘庄、龙王庙铁矿赋存于新太古代泰山岩群山草峪组中;铁矿体总体呈层状、似层状,局部呈透镜状,铁矿体产状与围岩一致。通过分析认为,区内的铁矿总体受山草峪组控制,构造、侵入岩对铁矿有破坏作用。经过对重磁测量成果分析,总体认为磁异常及其化极明显部位是区内铁矿勘查中最重要的指示标志,重力梯度带是铁矿赋存的重点位置。通过对以往勘查成果的综合分析认为,辛羊庙异常区应为今后铁矿勘查工作的首选地区。 相似文献
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程裕淇确定了泰山岩群雁翎关组、山草峪组、柳杭组地层划分,在斜长角闪岩中发现残存的变余杏仁状构造和岩流特征,正确区分了变基性熔岩流、变火山凝灰质岩和变基性脉体。原化马湾组黑云斜长片麻岩为新太古代早期条带状英云闪长质片麻岩。富山背斜的片麻状奥长花岗岩锆石SHRIMP U-Pb年龄(2 612±20)Ma,其侵入的具变余气孔状充填构造的斜长角闪岩属于雁翎关组;而李家庄倒转向斜核部的柳杭组含砾黑云变粒岩中最年轻的碎屑锆石SHRIMP U-Pb年龄(2524±7)Ma。 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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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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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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刘希林 《中国地理科学(英文版)》1995,5(3):275-287
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