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可地浸砂岩型铀矿床由于其上覆盖层较厚,地表异常信息十分微弱,找矿难度相当大。本文通过研究新疆伊犁盆地510、511、512等3个已知可地浸砂岩型铀矿床的航磁资料,发现这些矿床上方均存在微航磁异常,根据可地浸砂岩型铀矿的成矿地球化学机制,对微航磁异常的形成机理作了进一步探讨,结合试验区的实际预测成果,指出与氧化还原过渡带有关的可地浸砂岩型铀矿床上方存在微航磁异常,高精度航磁完全能探测到。微航磁异常是此类矿床的特征异常之一,可以作为一种重要标志信息运用于前期成矿预测。 相似文献
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砂岩型铀矿勘查中航放、航磁信息开发研究 总被引：1，自引：0，他引：1
本文以伊犁盆地南缘5个砂岩型铀矿床为研究对象，通过对已知铀矿床航放、航磁特征的研究，强调航放下测铀宽道Udw、上测铀窄道Uu、上测铀宽道Uuw和下测铀窄道Ud4种参数异常是砂岩型铀矿的直接指示标志；对航放信息相关性分析进行了探讨，认为航放相关性分析不适合层间氧化带砂岩型铀矿的预测，相关性分析圈定的Th、K元素负相关区带为古河道砂岩型铀矿床产出的有利部位；对弱磁异常进行了研究提取，首次提出用弱磁分布范围来圈定盖层氧化区（带）的观点；建立航放、航磁计算机预测模型，对整个盆地进行了砂岩型铀矿成矿预测，圈定远景区14片，便于进一步开展地面物探工作，继续扩大伊犁盆地的找矿成果。认为航放、航磁在可地浸砂岩型铀矿勘查中仍能发挥重要作用。 相似文献
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在中—新生代盆地区,受盆地盖层影响,砂岩型铀矿的航磁ΔT异常信息不明显,这直接影响利用航磁资料寻找砂岩型铀矿的应用效果。开展盆地内航磁微弱信息提取方法的研究,能充分发挥航磁资料在砂岩型铀矿勘查中的作用。本文总结了砂岩型铀矿形成微弱航磁异常的机理,分析界定了航磁微弱磁异常的定量范围,以1∶5万高精度航磁数据为基础,通过对内蒙古西部已发现的层间氧化带砂岩型铀矿床航磁特征进行分析研究,总结出一套利用高通滤波提取砂岩型铀矿上方航磁微弱信息的方法,使用该方法在内蒙古二连盆地某铀成矿带开展了航磁微弱异常提取实验,在3个已发现的氧化带砂岩型铀矿上方提取出航磁微弱异常信息,为利用高精度航磁测量方法在中—新生代盆地区寻找砂岩型铀矿探索出一条新途径。 相似文献
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俄罗斯砂岩型铀矿的新近研究进展 总被引：4，自引：0，他引：4
俄罗斯地质学家А.Б.哈列佐夫博士于2002年1月14－25日在核工业北京地质研究院讲学和交流，系统地介绍了俄罗斯近年来在铀矿地质领域，特别是可地浸砂岩型铀矿床普查、钻探、预测工作和地浸矿床开采工艺上的一系列研究进展，并以达尔马托夫矿床为例，详细地介绍了古河谷型铀矿床的分布规律和赋存特征，地浸方法开采的地质工艺特性；最后，前瞻性地预测了俄罗斯渗入型铀矿成矿前景。我国北方与俄罗斯相邻，有些地区的地质构造背景、成矿地质特征与俄罗斯相似，介绍这些内容可为我们进行新一轮砂岩型铀矿成矿预测、找矿勘探工作等方面提供参考。 相似文献
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高精度航磁测量相对简单,获得的信息丰富,是开展大面积成矿预测的有利工具。澳大利亚艾萨山选区地质资料较少,地面物探工作开展较难。利用高精度航磁资料,对该地区航磁数据进行了处理与解释,推断出断裂构造及岩体分布。结合区域成矿地质、构造环境和金属矿床时空分布特点,识别出成矿有利地区的航磁异常特征,划分了有利航磁异常分布带。在航磁有利异常分布图的基础上,结合矿床、矿点位置情况,进一步圈定出成矿远景区,为该地区成矿预测工作提供了依据。 相似文献
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滇西可地浸砂岩型铀矿特征,成因类型及成矿模式 总被引：7，自引：2，他引：5
文阐述了滇西新生代盆地可地浸砂岩型铀矿的矿床特征,讨论了铀矿床的成因类型,认为属“潜水顺层氧化带型”铀矿床。根据铀矿床的形成机制,对滇西地区新生代盆地的砂岩型铀矿成矿模式进行了探讨。 相似文献
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Inter-regional correlation of transgressions and regressions in the Cretaceous period 总被引：1，自引：0，他引：1
T. Matsumoto 《Cretaceous Research》1980,1(4):359-373
Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous. 相似文献
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The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism. 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
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正20140751 Guo Xincheng(Geological Party,BGMRED of Xinjiang,Changji 831100,China);Zheng Yuzhuang Determination and Geological Significance of the Mesoarchean Craton in Western Kunlun Mountains,Xinjiang,China(Geological Review,ISSN0371-5736,CN11-1952/P,59(3),2013,p.401-412,8 相似文献
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正20141058 Chen Ling(Key Laboratory of Mathematical Geology of Sichuan Province,Chengdu University of Technology,Chengdu610059,China);Guo Ke Study of Geochemical Ore-Forming Anomaly Identification Based on the Theory of Blind Source Separation(Geosci- 相似文献
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正20141334 Chen Kun(Institute of Geophysics,China Earthquake Administration,Beijing100081,China);Yu Yanxiang Shakemap of Peak Ground Acceleration with Bias Correction for the Lushan,Sichuan Earthquake on April20,2013(Seismology and Geology,ISSN0253-4967,CN11-2192/P,35(3),2013,p.627-633,2 illus.,1 table,9 refs.)Key words:great earthquakes,Sichuan Province 相似文献
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正20141624 Cai Xiongfei(Key Laboratory of Geobiology and Environmental Geology,Ministry of Education,China University of Geosciences,Wuhan 430074,China);Yang Jie A Restudy of the Upper Sinian Zhengmuguan and Tuerkeng Formations in the Helan Mountains(Journal of Stratigraphy,ISSN0253-4959CN32-1187/P,37(3),2013,p.377-386,5 illus.,2 tables,10 refs.) 相似文献
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正20142263Lü Shaojun(Geological Survey of Jiangxi Province,Nanchang 330030,China)Early-Middle Permian Biostratigraphical Characteristics in Qiangduo Area,Tibet(Resources SurveyEnvironment,ISSN1671-4814,CN32-1640/N,34(4),2013,p.221-227,2illus.,2tables,22refs.)Key words:biostratigraphy,Lower Permian,Middle Permian,Tibet 相似文献
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正20142560Hu Hongxia(Regional Geological and Mineral Resources Survey of Jilin Province,Changchun 130022,China);Dai Lixia Application of GIS Map Projection Transformation in Geological Work(Jilin Geology,ISSN1001-2427,CN22-1099/P,32(4),2013,p.160-163,4illus.,2refs.) 相似文献
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正20140692 Duo Tianhui(No.402 Geological Team,Exploration of Geology and Mineral Resources of Sichuan Authority,Chengdu611730,China);Wang Yongli Computer Simulation of Neptunium Existing Forms in the Groundwater(Computing Techniques for Geophysical and Geochemical Exploration,ISSN1001-1749,CN51-1242/P,35(3), 相似文献