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黑龙江省大地构造单元划分及特征 总被引：5，自引：0，他引：5
以板块理论为指导，对黑龙江省区域大地构造单元进行了划分，提出黑龙江省属古亚洲构造域，由亲西伯利亚陆块群和古中华陆块群两大板块的增生带组成。额尔齐斯-佐伦-黑河缝合线为两大板块的分界线，并进一步划分为4块3带，即额尔古纳地块、大兴安岭造山带；小兴安岭-松嫩地块、伊春-张广才岭造山带；布列亚-佳木斯-兴凯地块、扎兰屯地块和完达山造山带。在黑龙江省区域地质志的基础上，对Ⅰ、Ⅱ级大地构造单元的归属做了较大调整，对Ⅲ、Ⅳ级构造单元部分做了修正。 相似文献
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华北克拉通以北的中国东北地区古生代构造单元是地块还是造山带,是地质界近年争论的重要地质构造问题.通过对已有资料的综合研究,简要总结和讨论了各个"地块区"的地质特征,认为这些所谓的地块中,额尔古纳是新元古代晚期至古生代初期存在的地块,从寒武纪开始转变为造山带;其余所谓的古地块都是由古生代蛇绿岩、具有活动陆缘亲缘性的岩浆岩、增生杂岩和少量前南华纪岩石组成的古生代陆缘增生造山带或岛弧造山带.在此基础上,对该区地质历史上古老变质岩与地块关系、佳蒙地块是否存在、构造单元构造属性随时间变化等问题进行了初步讨论. 相似文献
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塔里木地块西南缘上古生界古地磁学研究 总被引：5，自引：0，他引：5
本文简要报道塔里木地块西南缘上古生界古地磁学研究的初步成果,并运用这些成果对研究区一些基本地质问题作了相应的解释,进一步从古地磁学角度证实塔里木地块与华北地块直至晚二叠世时仍是两个彼此分离、相距甚远的大地构造单元。 相似文献
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从鉴别陆块(地块)、结合带边界断裂入手,将滇西北大地构造划分为10个二级单元。根据地质体属性及重要断裂,在二级单元内划分出25个三级大地构造单元。结合西藏、滇西南部地区资料,归并为3个一级大地构造单元。二级大地构造单元自西向东为:独龙江弧盆系、丙中洛地块、莫得结合带、崇山地块、澜沧江火山弧、兰坪地块、云岭陆缘弧、金沙江结合带、香格里拉地块、甘孜-理塘弧盆系。分界断裂自西向东为:高黎贡山断裂、棒当断裂、福贡断裂、碧罗雪山断裂、吉岔断裂、德钦-雪龙山断裂、羊拉-东竹林断裂、金沙江断裂、香格里拉断裂、三江口断裂。该划分方案较为全面地反映了滇西北区域地质调查和科学研究的新进展,对前人划分方案进行了有依据的修改调整,二级、三级大地构造单元的划分尺度统一,厘定了各级大地构造单元的边界断裂。 相似文献
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加利福尼亚中生代弧－盆－沟系的构造和演化模式一向为世人所重视，作者应邀有机会对加州内华达岛弧地块、弗兰西斯科杂岩和大谷弧前盆地进行了实地地质考察。本文仅就这３个岩性－构造单元的一些独特地质征和地质景观作一简介。 相似文献
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大别造山带变质岩和花岗岩的钕同位素组成及其地质意义 总被引：21，自引：7，他引：21
大别造山带８个变质岩和４个花岗岩样品的Ｓｍ－Ｎｄ分析结果表明，大别地块不同构造单元的岩石有不同的钕同位素模式年龄。总体上，北大别地块变质岩的钕模式年龄较老；南大别超高压地块的较年轻，但变化范围大。侵人于大别地块不同构造单元的花岗岩与北大别地块变质岩有相同的Ｎｄ（１２２Ｍａ）值范围，表明它们有相似的物质来源。南大别地块是覆盖在具有古老物源的变质岩之上的一个构造岩片。 相似文献
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利用板块构造理论,依据近年来1：5万区域地质调查及相关科研成果,对辽宁地壳发展演化进行了分析研究,提出辽宁地壳发展可暂划分为早前寒武纪大陆增生构造体制和中元古宙以来的板块构造体制.中太古代-古元古代发现了绿岩地体和古元古宙裂谷,因此将早前寒武纪视作原始板块,中元古代-古生代视作古板块,中生代以来视作现代板块.在此基础上对辽宁大地构造单元进行了划分.辽宁Ⅰ级构造单元为塔里木-华北板块.Ⅱ级构造单元为天山-赤峰陆缘活动带和华北陆块.Ⅲ级构造单元5个,分别为建平-西丰华力西陆缘造山带、冀辽地块、铁岭-清原微地块、辽吉地块及下辽河-辽东湾新生代裂谷.Ⅳ级构造单元16个.为清楚地了解辽宁地壳发展演化特点,对5个Ⅲ级构造单元地质特征进行简要阐述. 相似文献
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福安—南靖断裂带特征及其地质意义讨论 总被引：1，自引：0，他引：1
通过对沉积建造、岩浆活动、构造变动以及地球物理和地球化学综合研究,在全国统一的一、二级构造单元划分框架下,以反映早古生代末构造格局为主,福建省大致以福安—南靖断裂构造带为省内一级构造单元为边界划分西部华夏地块、东部闽浙沿海火山侵入杂岩带2个三级构造单元,讨论了福安—南靖构造带特征及其地质意义。 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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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献