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目前对珠江口盆地中生代以来的演化过程及其与沉积环境演变的响应关系尚缺乏系统性认识.基于珠江口盆地中-新生代岩浆活动、断陷结构样式及其改造、典型构造变形样式、沉积中心的转换等特征的对比分析,将盆地中-新生代的构造演化划分为4个阶段、7个期次：（1）中侏罗世-晚白垩世早期（～170～90 Ma）为古太平洋板块俯冲主控的陆缘岩浆弧-弧前盆地演化阶段;（2）晚白垩世-始新世中期（～90～43 Ma）为太平洋板块俯冲后撤背景下弧后周缘前陆/造山后塌陷-主动裂谷演化阶段;（3）始新世中期-中中新世（～43～10 Ma）为华南挤出-古南海俯冲拖曳主导的被动陆缘演化阶段;（4）晚中新世以来（～10～0 Ma）为菲律宾板块NWW向仰冲主导的挤压张扭演化阶段.～90 Ma、～43 Ma、～10 Ma分别实现了由安第斯型俯冲向西太平洋型俯冲、由主动裂谷向被动陆缘伸展、由被动陆缘伸展向挤压张扭的转换.在此过程中,伴随着古南海和南海的发育-消亡,新生代裂陷期沉积环境由东向西、由南向北逐渐海侵,裂后期由南向北阶段性差异沉降,由陆架浅水向陆坡深水转换,这使得珠一/三、珠二、珠四坳陷的石油地质条件具有显著的分带差异性... 相似文献
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中国东南部侏罗纪—第三纪陆相地层沉积特征 总被引：19，自引：1，他引：19
系统分析、总结了中国东南部地区中新生代地层的分布状况、沉积作用、构造特征 ,反映出地层分布总体上具 NE走向、SE— NW的分带现象 ,现今盆地的面貌有五种不同类型及相应的几何形态。分析认为 ,中国东南部早、中侏罗世普遍为拉张裂陷沉积环境 ,在赣南、粤北、闽西一带发育双峰式火山岩 ;稍后可能受到区域性挤压 ,如皖南、浙西、赣东北等地有南东向北西逆冲的压性构造 ;早白垩世为火山喷发高峰期 ,研究区均不同程度发生了火山喷发 ,其中东南沿海发育大面积的火山岩 ;早白垩世以后华南全区转为拉张 ,发育大量中、小型断陷盆地等伸展型盆地 ;晚白垩世—第三纪地壳继续处于拉张松弛环境 ,形成以裂谷环境为主要特征的火山—沉积岩石组合。这些结果表明 ,早—中侏罗世受古特提斯构造域和太平洋构造域的共同影响 ,中侏罗世之后太平洋板块占主导 ,上述现象主要系太平洋板块在晚中生代不同阶段对中国东南部俯冲作用的方位、俯冲速率、俯冲角度有所变化所导致 相似文献
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中国东南部与日本中—新生代构造-岩浆作用对比研究 总被引：5，自引：1，他引：4
重点讨论了中国东南部和日本中、新生代火成岩的时空分布及其构造环境,总结了两者的异同性。印支期和燕山早期（190～170Ma）中国东南部和日本具有不同的岩浆活动演化史。在165～150Ma期间,中国东南部广泛分布有过铝和弱过铝的S型花岗岩,而170～130Ma则为日本岩浆活动沉寂期。燕山晚期,中国东南部和日本都发生大规模的火山-侵入活动,同是库拉-太平洋板块向欧亚大陆俯冲-碰撞及其后伸展-裂解的产物,日本开始时代晚（130Ma）,并一直持续到始新世（45Ma）。进入喜马拉雅期,在日本海打开之前（>15Ma）,中国东南部和日本同处于大陆伸展构造环境,在日本海打开之后（<15Ma）,中国东南部和日本进入完全不同的构造演化阶段。 相似文献
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胶东地区沉积-岩浆-构造-成矿事件序列的时空演化,是在侏罗纪-白垩纪时期受太平洋板块向欧亚大陆俯冲作用的影响,而造成的挤压-伸展构造交互转换环境中形成的,金成矿作用发生在挤压与伸展转换过程中的伸展阶段。这一挤压-伸展联合作用过程表现在:①构造方面,表现为四期六阶段不同力学性质和方向的挤压-伸展特征:第一期近S-N向挤压及NW-SE向挤压,第二期NE-SW向挤压与NE-SW向引张,第三期NW向引张,第四期近E-W向挤压与近S-N向引张。②地层方面,在胶东各断陷盆地内发育的莱阳群、青山群和王氏群,以区域不整合、沉积间断和正常地层单元交互出现展现出挤压-伸展的过程。③侵入岩方面,分为三个侵入岩浆构造幕和四次岩浆侵入事件:第一幕(早期)为晚侏罗世玲珑片麻状二长花岗岩组合, SHRIMP锆石U-Pb年龄值集中在160～150 Ma,是区域构造挤压导致地壳增厚引起地壳重熔的产物,其后的伸展引张形成了各种密集分布的脉岩群;第二幕(中期)是早白垩世早期郭家岭花岗闪长岩组合,SHRIMP锆石U-Pb年龄集中在130～126Ma,之后的沉积岩建造组合代表构造应力体制由挤压为主向伸展为主转换;第三幕(晚期)包括两次岩浆侵入事件,一是伟德山花岗岩组合,指示了挤压向伸展转换环境,二是崂山A型晶洞过碱性正长花岗岩组合,形成于典型的后造山伸展构造环境。④火山岩方面,分为三个喷发亚旋回和七个喷发期,各亚旋回间均具有较长的时间间隔,代表了区域性挤压环境;各期次之间虽有短暂喷发间隔,但总体表现为伸展环境,火山喷发事件显示了挤压-伸展不同构造环境的交替发生。⑤岩石学方面,玲珑花岗岩中的片理、片麻理构造和郭家岭花岗闪长岩中的钾长石旋转眼球体、σ构造、S-C组构、压力影构造等,代表了挤压剪切的构造环境下形成的岩石特征;而崂山晶洞碱性正长岩组合,则反映了典型的伸展构造环境。晚侏罗世-早白垩世胶东地区地层沉积、岩浆侵入、火山喷发建造、构造活动及成矿作用过程所表现出的挤压-伸展相互转换过程,构筑了手风琴式构造-岩浆-成矿作用方式,这是胶东地区形成大型、超大型金矿的动力学条件。根据胶东金矿的产出环境和有关年代学资料,将金矿成矿划分为早期成矿事件、主成矿期和晚期叠加成矿事件。 相似文献
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古太平洋板块的俯冲、回卷（rollback）及俯冲方向的转变对中国黄海及邻近地区盆地的发育有着重要的影响.综合利用野外剖面、钻井岩心和地震剖面等,对比分析不同盆地间沉积充填历史,识别出不同时期应力场方向的变化和主要构造变形样式,对主要断裂进行界定,为关键时间节点提供证据,并恢复了侏罗纪-白垩纪的构造演化过程.结果表明：（1）在古太平洋板块俯冲作用背景下,受郯庐断裂带F1和朝鲜半岛西部断裂带F2两个主控断裂带共同的控制作用,盆地经历了多期“伸展”和“挤压”的构造应力场的转变,性质各不相同;（2）构造演化可划分为6个阶段：莱阳期近南北向拉伸,发育被动裂谷;125±1 Ma阶段,热隆挤压造成轻微构造反转,形成隆起区的角度不整合;青山期近东西向滑脱伸展形成主动裂谷性质的火山弧盆;87.5±2.5 Ma挤压阶段,经历了大规模左旋走滑,形成区域角度不整合;王氏期热沉降,形成带走滑拉分性质的大面积坳陷;50±5 Ma挤压阶段,主要在F1、F2断裂经历右旋走滑;（3）估算了挤压阶段的走滑量,对伸展阶段的伸展率、沉降率进行了计算.首次恢复了中国黄海及邻近地区晚中生代挤压构造幕演化之前的构造格局和盆地原型... 相似文献
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重点讨论了中国东南部和日本中、新生代火成岩的时空分布及其构造环境,总结了两者的异同性。印支期和燕山早期（190-170Ma）中国东南部和日本具有不同的岩浆活动演化史。在165-150Ma期间,中国东南部广泛分布有过铝和弱过铝的S型花岗岩。而170-130Ma则为日本岩浆活动沉寂期。燕山晚期,中国东南部和日本都发生大规模的火山-侵入活动,同是库拉-太平洋板块向欧亚大陆俯冲-碰撞及其后伸展-裂解的产物,日本开始时代晚（130Ma）,并一直持续到始新世（45Ma）。进入喜马拉雅期,在日本海打开之前（〉15Ma）,中国东南部和日本同处于大陆伸展构造环境,在日本海打开之后（〈15Ma）,中国东南部和日本进入完全不同的构造演化阶段。 相似文献
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黑龙江漠河盆地构造特征与成盆演化 总被引：25，自引：0，他引：25
对漠河盆地的地层层序、构造特征和构造单元、盆地演化过程等进行了研究。漠河盆地盖层主要为侏罗纪陆相煤系地层及白垩系火山岩，属典型的二元结构。晚侏罗世中期由于蒙古—鄂霍茨克洋的关闭，额尔古纳微板块与西伯利亚板块碰撞，使盆地西部产生逆冲推覆构造，地层缩短量在64km以上。晚侏罗世晚期到晚白垩世，盆地进入西太平洋构造域演化阶段，处于拉张环境，在盆地中部和东部发生了三期大规模的火山活动，形成火山断陷盆地。因此，漠河盆地经历了蒙古—鄂霍茨克洋和西太平洋两种不同构造域的演化阶段，具有西部挤压推覆、中部和东部拉张断陷构造特点。 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