共查询到20条相似文献，搜索用时 945 毫秒
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航空重力、磁力测量是解决海陆过渡区地球物理资料不连续问题的有效途径,所获取的数据为进一步认识苏鲁造山带西段断裂展布、大地构造属性等基础地质问题提供了科学依据.基于最新高精度航空重磁数据,编制了日照-连云港地区1:25万重力、磁力异常图,结合区域地质资料,分析重、磁异常特征,在日照-连云港地区圈定了郯庐断裂带、桑墟-连云港断裂、东海-赣榆断裂、五莲-桃园断裂等基底断裂构造.研究认为苏鲁造山带南部边界为桑墟-连云港断裂（连黄断裂）,以该断裂为界,北侧基底为华北板块组成部分,断裂南侧为下扬子板块基底;以东海-赣榆断裂为界,苏鲁造山带可分为南部和北部,两部分在后期构造活动方面差异显著. 相似文献
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为满足1:25万海洋区域地质调查需求,解决海陆过渡区的基础地质问题,在统一编制1:25万重力异常图和磁力异常图的基础上,分析日照—连云港地区主要断裂的重磁异常特征。结合区域地质资料,探讨郯庐断裂沂水段、桑墟—连云港断裂、东海—赣榆断裂的重磁异常特征及其地质意义。结果表明: 昌邑—大店断裂是郯庐断裂沂水段的主断裂; 作为苏鲁造山带的南部边界,桑墟—连云港断裂控制了基底、地层和岩浆岩的分布; 东海—赣榆断裂将苏鲁造山带分割为南、北2部分。这些新认识为日照—连云港地区基础地质研究提供了重要参考。 相似文献
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比勒提地区位于新疆西南天山,以该区1∶50000高精度磁测数据为基础,采用解析延拓、方向导数等技术手段提取与断裂构造有关的磁异常信息,对区域内构造进行识别,结合标本物性参数统计,对引起磁异常的原因进行分析。对区域磁异常向上延拓及求一阶导数后进行对比,圈定4个特征异常带A1~A4,结合地质资料,识别出4条断裂构造FW1~FW4,FW1和FW2对应喀拉铁克断裂及其次级断裂,FW3为构造动力作用产生的强片理化带,FW4为隐伏断裂,表明高精度磁法测量在本区能有效识别断裂并反映其分布。 相似文献
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比勒提地区位于新疆西南天山,以该区1：50000高精度磁测数据为基础,采用解析延拓、方向导数等技术手段提取与断裂构造有关的磁异常信息,对区域内构造进行识别,结合标本物性参数统计,对引起磁异常的原因进行分析。对区域磁异常向上延拓及求一阶导数后进行对比,圈定4个特征异常带A1-A4,结合地质资料,识别出4条断裂构造FW1-FW4,FW1和FW2对应喀拉铁克断裂及其次级断裂,FW3为构造动力作用产生的强片理化带,FW4为隐伏断裂,表明高精度磁法测量在本区能有效识别断裂并反映其分布。 相似文献
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为验证低飞航磁技术在推断断裂带和预测成矿远景区中的应用效果,以江西朱溪矿区以往的地质构造、物化探工作为背景,对朱溪测区的低飞航磁数据进行向上延拓和梯度处理,即总梯度模、斜导数和垂向一阶导数计算。将计算后的多幅异常等值线图与测区的区域地质构造及江西矿区成矿特点相结合,在该地区共推断出地质断裂8条,构造走向为NE向、近EW向及NW向。其中,NE向断裂为该区域主要的深大断裂,形成于下扬子板块和上华夏板块之间由于推覆构造所产生的压挤作用,主要位于塔前—赋春断裂带和双田—石劈山断裂带附近;近EW向和NW向断裂为次生断裂,近EW向断裂可能由九江—德兴断裂带产生。同时,通过分析朱溪矿区矽卡岩矿床所具有的特殊磁梯度异常现象,共推断成矿远景区4个,主要位于断裂带附近。 相似文献
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1 区域地质概况大兴安岭地区南至华北地台北缘断裂,北界为蒙古-鄂霍次克褶皱系,东至北北东向的嫩江-白城断裂与松辽盆地为界,大兴安岭属东西向延伸的天山-兴蒙褶皱系的东段.在地形上大兴安岭西坡远比东坡宽缓.该成矿带由西伯利亚板块东南大陆边缘和华北板块北部大陆边缘组成. 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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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
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Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931. 相似文献
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正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.) 相似文献
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正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.) 相似文献
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正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.) 相似文献
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正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus., 相似文献
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正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an 相似文献
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正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of 相似文献