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1.
新生代以来南中国海的多幕旋回运动形成了其北部陆坡性质各异、演化有别的多个陆缘沉积盆地。依据各盆地新生界发育特征、主干地震剖面及钻井资料对南海北部的相对海平面变化与沉积环境进行系统分析,采用年代地层对比的方法探讨南海北部构造演化序列与海陆变迁规律的内在联系,再现了南海北部陆缘新生代的海陆变迁过程,从而建立了南海北部陆缘裂谷盆地、走滑拉分盆地和陆内裂谷盆地的构造—沉积充填一体化模式。新生代海平面整体呈上升趋势,古近纪各盆地以陆相河流、粗粒三角洲湖相沉积为主;而新近纪主要发育滨浅海及三角洲相,呈现出明显的早陆后海的规律。靠近陆地一侧的陆内裂谷盆地北部湾盆地海侵最晚,其古近系充填厚度明显大于新近系,以发育近源扇三角洲为特色;而靠近海域一侧的走滑拉分盆地(莺歌海盆地)则以新近纪海相沉积占优势;陆缘裂谷盆地(琼东南与珠江口盆地)古近纪陆相与新近纪海相相对均衡发育,发育大型三角洲与碳酸盐岩台地。不同盆地的沉积充填特征主要受构造运动与海侵规模控制,并由此奠定了不同盆地的资源前景。 相似文献
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The controls and development of early-post-rift, deep-water depositional systems are poorly understood due to their commonly deeply-buried nature. As a consequence, in the subsurface there is usually a lack of well penetrations and/or weak seismic imaging. At outcrop, early post-rift strata have commonly been deformed beyond reasonable recognition by later inversion tectonics. In contrast to these systems, the North Viking Graben shows a well-imaged Cretaceous early post-rift package with good well control and little effect from inversion. Therefore, this paper examines the early post-rift, deep-water depositional systems of the North Viking Graben to determine the controls on their stratigraphic position, geometry and evolution, and thus provide an analogue for comparable systems. Greater understanding of such systems will allow for the enhanced prediction of reservoir units in the subsurface and development of new play models since post-rift intervals are generally under-explored.The basin configuration inherited by the Cretaceous early post-rift in the northern North Sea was set up by Permo-Triassic and Late Jurassic rifting. In the North Viking Graben this established considerable along-strike variability, resulting in a northern basin segment surrounded by steep slopes and faulted-bounded structural highs and a southern basin segment margined by slopes with noticeably gentler gradients. Associated with the Cretaceous post-rift is an overall transgressional trend, which drowned local source areas, resulting in prevalent carbonate and hemipelagic mudstone deposition in the basins. In the North Viking Graben, the uplifted Oseberg fault-block provided the sub-aerial clastic source area until it was submerged in the early Upper Cretaceous.The early post-rift infill of the North Viking Graben was divided into four key seismic stratigraphic units (K1, K2, K3 and K4) using an integration of seismic and well data. Inside this stratigraphic framework, the depositional systems within each K-unit were resolved from characteristic seismic facies, amplitude anomalies, relationship with adjacent reflections, and geomorphologies. In the northern basin segment, the early post-rift stratigraphy contains basin-floor fans, a channel complex and a shoreline-like geometry, whereas the southern basin segment is solely characterised by hemipelagic and carbonate deposition. This spatial variability indicates that one of the dominant controls on the development of the early post-rift depositional systems in the North Viking Graben was the inherited syn-rift fault-controlled topography. The steep slopes bounding the northern basin segment aided the delivery of sediment from the sub-aerial Oseberg source area to the graben whereas the submerged, gentle slopes in the southern basin segment were relatively sediment-starved.Long- and short-term changes in relative sea-level also heavily influenced the evolution of the early post-rift basin stratigraphy. Short-term relative sea-level fall allowed basin-floor fan emplacement whereas short-term relative sea-level stand-still favoured deposition of a channel complex. Deposition of the shoreface-like geometry is associated with a short-term relative sea-level rise. This temporal difference in the style and scale of the depositional systems is also interpreted to reflect the gradual denudation and drowning of the Oseberg source area. Regional short-term trangressive and anoxic events in the northern North Sea further influenced the early post-rift strata, resulting in the deposition of stratigraphic units that can be correlated across the North Sea. 相似文献
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This study examines the sedimentary response to a tectonically driven relative sea‐level fall that occurred in the Neuquén Basin, west‐central Argentina, during the late Early Valanginian (Early Cretaceous). At this time the basin lay behind the emergent Andean magmatic arc to the west. Following the relative sea‐level fall, sedimentation was limited to the central part of the Neuquén Basin, with the deposition of a predominantly clastic, continental to shallow marine wedge on top of basinal black shales. This lowstand wedge is called the Mulichinco Formation and consists of a third‐order sequence that lasted about 2 Myr and contains high frequency lowstand, transgressive, and highstand deposits. Significant variations in facies, depositional architecture, and internal organization of the sequence occur along depositional strike. These variations are attributed mainly to tectonic and topographic controls upon sediment flux, basin gradient, fault tilting, and shifting of the depocentre through time. These controls were ultimately related to asymmetrically distributed tectonic activity that was greater towards the magmatic arc in the west. The superposition of fluvial deposits directly upon offshore facies provides unequivocal evidence for a sequence boundary at the base of the Mulichinco Formation. However, the Mulichinco sequence boundary is marked by shallow, low erosional relief and widespread fluvial deposition. The surface lacks prominent valleys traditionally associated with sequence boundaries. This non‐erosive sequence boundary geometry is attributed to the ramp‐type geometry of the basin and/or rapid uplift that limited stratigraphic adjustment to base‐level fall. Significant along‐strike facies changes and a low‐relief sequence boundary are attributes that may be common in tectonically active, semi‐enclosed basins (e.g. shallow back‐arc basins, foreland basins). 相似文献
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This study documents sediment infill features and their responses to the tectonic evolution of the Sichuan Basin and adjacent areas. The data include a comparison of field outcrops, well drillings, inter-well correlations, seismic data, isopach maps, and the spatial evolution of sedimentary facies. We divided the evolutionary history of the Sichuan Cretaceous Basin into three stages based on the following tectonic subsidence curves: the early Early Cretaceous (145–125 Ma), late Early Cretaceous to early Late Cretaceous (125–89.8 Ma), and late Late Cretaceous (89.8–66 Ma). The basin underwent NW–SE compression with northwestward shortening in the early Early Cretaceous and was dominated by alluvial fans and fluviolacustrine sedimentary systems. The central and northern areas of the Sichuan Basin were rapidly uplifted during the late Early Cretaceous to early Late Cretaceous with southwestward tilting, which resulted in the formation of a depression, exhibited southwestward compression, and was characterized by aeolian desert and fluviolacustrine deposits. The tectonic framework is controlled by the inherited basement structure and the formation of NE mountains, which not only affected the clastic supply of the sedimentary basin but also blocked warm-wet currents from the southeast, which changed the climatic conditions in the late Late Cretaceous. The formation and evolution of Cretaceous sedimentary basins are closely related to synchronous subtle far-field tectonism and changes in climate and drainage systems. According to the analysis of the migration of the Cretaceous sedimentation centers, different basin structures formed during different periods, including periods of peripheral mountain asynchronous thrusting and regional differential uplift. Thus, the Sichuan Cretaceous sedimentary basin is recognized as a superimposed foreland basin. 相似文献
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在大量的区域地质调研和野外露头观测资料基础上,详细研究了西藏羌塘盆地东部中生代不同构造单元的沉积充填序列、地层发育特征与接触关系、构造界面性质、沉积体系配置和沉积相分布等,阐述了盆地沉积与周缘构造带演化之间的耦合关系,重建了研究区中生代不同时期的构造古地理面貌。研究表明,羌塘盆地是一个大型叠复式盆地,盆地东部中生代有海相、海陆过渡相和陆相3个沉积体系组、9个沉积体系和多个沉积（亚）相。盆地内部包括南羌塘坳陷、北羌塘坳陷、唐古拉山隆起带,以及不同时期的次级凸起与断凹等构造单元。其中,多玛断凹是以前石炭纪构造片岩为基底的侏罗纪-早白垩世早期被动大陆边缘陆表海盆地,早白垩世晚期转换为前陆盆地,晚白垩世以来与索县-左贡断凹联合为一体,在陆内造山过程中经历了压陷型盆地充填演化阶段。索县-左贡断凹是在晚三叠世班公湖-怒江沟-弧-盆体系基础上发展起来的前陆盆地。北羌塘坳陷是以华力西期开心岭-杂多隆起带为基底,经过晚三叠世昌都前陆盆地沉积、早侏罗世断陷盆地火山-沉积作用之后,于中侏罗世与索县-左贡断凹联合为一体,形成北羌塘-昌都巨型坳陷型盆地。白垩纪北羌塘陆块和昌都陆块处于隆升剥蚀状态。 相似文献
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J. J. Veevers 《Australian Journal of Earth Sciences》2013,60(2):87-96
From north to south, the sedimentary basins of Western Australia change from broad platforms of wholly marine strata that span the entire Phanerozoic (Bonaparte Gulf and Canning Basins) through the intermediate Carnarvon Basin to rifts of nonmarine Permian and Mesozoic strata (Perth Basin). These contrasts in age, facies, and structure reflect different positions of the basins in Gondwanaland: the Bonaparte Gulf and Canning Basins have lain at the continental margin facing an open ocean during the entire Phanerozoic, whereas the Perth Basin lay in the interior of Gondwanaland until India and Australia moved apart in the Cretaceous. The Eucla Basin came about by events connected with the dispersal of Antarctica and Australia in the Eocene. The northwest part of the Australian Block (Timor and the Timor Sea) was deformed in the Miocene when Australia collided with southeast Asia. 相似文献
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Rory Mortimore 《Proceedings of the Geologists' Association. Geologists' Association》2011,122(2):232-297
Inversion tectonic episodes are identified in the Upper Turonian - Lower Coniacian, Santonian - Lower Campanian and later Lower Campanian Chalk. It is suggested that episodic tectonism created the seabed topography on which sea levels and erosional currents acted. Marked differentiation into linear belts of local basins and swells with a greater variety of sediments is present in the Santonian and Lower Campanian. During this same period the locus of sedimentation shifts westwards from the southern margin of the Weald to Wessex as Weald Basin inversion increases. Tectonic episodes also produced synsedimenary fracturing of the Chalk and evolution of vein networks and stylolytes. Upper Cretaceous tectonic and sea-level events also affected the platform of Europe, the Carpathians and the Syrian Arc where sedimento-tectonic scenarios provide analogues for the Chalk. Linking sea-level oscillations and tectonic episodes with microtectonic studies suggests a frequency of events within the range of 0.35-1.5 Ma. 相似文献
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北美东部被动大陆边缘是世界上最古老的完整被动大陆边缘之一,是研究被动大陆边缘发育演化的天然实验室。本文在大量国外研究成果的基础上,应用盆地构造解析方法,深入研究了北美东部被动大陆边缘盆地群的地质结构和构造演化特征,并揭示了盆地群的油气地质规律。研究认为,北美东部盆地群沉积充填和不整合面发育具有明显的分段性和差异性。以区域不整合面为界,不同段盆地可划分为不同的构造层:南段盆地可划分为两套构造层;中段南部盆地可划分为3套构造层;中段北部盆地可划分为4套构造层;而北段盆地可划分为5套构造层。盆地群整体经历了陆内裂谷—陆间裂谷—被动大陆边缘的演化过程,但不同段盆地的构造演化具有明显的分段性和迁移性:晚三叠世沉降中心位于南段盆地;早侏罗世初期迁移至中段盆地,南段大陆开始裂解;中侏罗世逐渐迁移至北段盆地,中段大陆开始裂解;早白垩世晚期,北段大陆开始裂解。受持续的抬升剥蚀及大西洋岩浆活动省的联合作用,南段盆地和中段大多数盆地缺乏油气保存条件;斯科舍盆地和大浅滩盆地是主要的含油气盆地,以上侏罗统烃源岩为主,主要发育断层—背斜圈闭和盐体刺穿圈闭,整体表现为“自生自储”和“下生上储”的特征。 相似文献
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This paper presents a model of facies distribution within a set of early Cretaceous, deep‐lacustrine, partially confined turbidite fans (Sea Lion Fan, Sea Lion North Fan and Otter Fan) in the North Falkland Basin, South Atlantic. As a whole, ancient deep‐lacustrine turbidite systems are under‐represented in the literature when compared with those documented in marine basins. Lacustrine turbidite systems can form extensive, good quality hydrocarbon reservoirs, making the understanding of such systems crucial to exploration within lacustrine basins. An integrated analysis of seismic cross‐sections, seismic amplitude extraction maps and 455 m of core has enabled the identification of a series of turbidite fans. The deposits of these fans have been separated into lobe axis, lobe fringe and lobe distal fringe settings. Seismic architectures, observed in the seismic amplitude extraction maps, are interpreted to represent geologically associated heterogeneities, including: feeder systems, terminal mouth lobes, flow deflection, sinuous lobe axis deposits, flow constriction and stranded lobe fringe areas. When found in combination, these architectures suggest ‘partial confinement’ of a system, something that appears to be a key feature in the lacustrine turbidite setting of the North Falkland Basin. Partial confinement of a system occurs when depositionally generated topography controls the flow‐pathway and deposition of subsequent turbidite fan deposits. The term ‘partial confinement’ provides an expression for categorising a system whose depositional boundaries are unconfined by the margins of the basin, yet exhibit evidence of internal confinement, primarily controlled by depositional topography. Understanding the controls that dictate partial confinement; and the resultant distribution of sand‐prone facies within deep‐lacustrine turbidite fans, is important, particularly considering their recent rise as hydrocarbon reservoirs in rift and failed‐rift settings. 相似文献
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塔里木盆地西部白垩纪—古近纪发生了大规模的海侵事件,形成一个喇叭状向西开口的海湾,该海湾属于东特提斯洋的一个分支。该地区白垩纪—古近纪海相地层记录了东特提斯洋演化和一系列重大地质事件,具有重要的研究价值,但对其地层的研究仍相对薄弱,对重大地质事件的研究还不够深入。本文拟通过详细的岩石地层、生物地层和其他地层方法,完善地层划分与对比框架,并在此基础上讨论Cenomanian/ Turonian界线大洋缺氧事件(OAE2)、白垩纪/古近纪界线(K/Pg)、古新世—始新世极热事件(PETM)、特提斯海进与海退等一系列重大地质事件。塔里木盆地白垩纪—古近纪海相或海陆过渡相地层自下而上为克孜勒苏群、库克拜组、乌依塔克组、依格孜牙组、吐依洛克组、阿尔塔什组、齐姆根组、盖吉塔格组、卡拉塔尔组、乌拉根组和巴什布拉克组,上述地层中含有丰富的有孔虫、介形虫、钙质超微、沟鞭藻、孢粉、双壳类、腹足类等化石,以及少量菊石、腕足类、海胆和鲨鱼牙齿等化石。综合的生物地层和年代地层研究表明,克孜勒苏群的时代为早白垩世Barremian-Albian期,库克拜组—依格孜牙组的时代为晚白垩世Cenomanian-Maastrichtian期(Cenomanian/Turonian界线可能位于库克拜组三段),吐依洛克组的时代为白垩纪—古近纪过渡期;阿尔塔什组的时代为古新世早中期,齐姆根组为古新世晚期—始新世最早期,盖吉塔格组—乌拉根组的时代为中始新世中晚期,巴什布拉克组的时代为晚始新世,但不排除最上部进入渐新世早期。塔里木盆地的海侵开始于克孜勒苏群中上部沉积期(Albian晚期—Aptian早期),但规模很有限,大规模的海侵始于晚白垩世Cenomanian早期;从晚白垩世—古新世,共经历了5次大规模的海侵—海退事件;大约41 Ma前后,海水退出盆地南部的昆仑山山前,34 Ma前后,海水退出盆地北部的天山山前。上述海侵—海退事件可能受构造和全球海平面变化的双重影响,但构造事件对海侵的启动和结束可能更具决定性的影响。阐述了塔里木盆地西部白垩纪—古近纪海相地层所记录的OAE2、K/Pg界线、PETM和特提斯海侵—海退等事件,其中笔者及团队第一次在塔里木盆地西部齐姆根组中所发现和报道的PETM事件,将有助于揭示全球近岸地区PETM的特征和生物-环境响应。在未来的研究中,需要进一步厘清塔里木盆地西部地层序列,建立更加精细的生物地层和年代地层框架,加强对PETM和特提斯海侵—海退等重大地质事件的研究。 相似文献
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南海南沙海域沉积盆地构造演化与油气成藏规律 总被引：2，自引：0，他引：2
据钻井、地震剖面、区域地质及磁异常条带分析解释,南沙海域及其邻区的主要沉积盆地的形成演化受裂谷起始不整合面和破裂不整合面分隔,可分为前裂谷期、裂谷期和后裂谷期3个构造阶段。大中型油气藏相关数据的统计表明,南沙海域及邻区大中型油气藏的成藏要素和油气田发育受构造阶段控制。(1)烃源岩发育具有分期、分区特征,礼乐盆地发育前裂谷期、裂谷1幕烃源岩;万安、曾母、西北巴拉望盆地发育裂谷2幕烃源岩,文莱-沙巴盆地发育后裂谷期烃源岩。(2)储层发育具有分期、分带特征,表现为外带老(裂谷2幕)、内带新(后裂谷期)。(3)圈闭类型包括构造、岩性地层圈闭及构造-岩性地层等因素形成的复合圈闭,大致具有内带以地层圈闭为主,外带以构造圈闭为主的特征。(4)大中型油气田分布具有外带砂岩富油气、内带碳酸盐岩富气特点。(5)南沙海域及邻区发育两个后裂谷期主含油气区,即东部巴兰三角洲砂岩背斜油气区和西部卢卡尼亚碳酸盐台地气区。其中,大中型气田的成藏要素组合为裂谷2幕烃源岩、后裂谷期碳酸盐岩储层和地层圈闭;大中型油气田则为后裂谷期烃源岩、砂岩储层和背斜圈闭。 相似文献
13.
包括苏北-南黄海地区在内的下扬子区海相古生界盆地,在中三叠世末以来的构造演化过程中,经历了3期不同性质构造作用的改造变形。(1)在中三叠世末-早、中侏罗世的印支运动期,发生了江南-雪峰基底拆离体由南东向北西方向(同时派生由南向北,由东向西方向)的逆冲推覆,以及后缘弹性松弛断陷构造作用的改造,使海相古生界盆地发生了第Ⅰ期的由强及弱、递进衰减的逆冲 褶皱变形。(2)在晚侏罗-早白垩世的燕山运动期,叠加了第Ⅱ期以郯庐断裂带为代表的NNE向大陆平移走滑构造的左行简单剪切,以及拉分断陷构造作用的改造变形。(3)在晚白垩世-古近纪的喜马拉雅运动期,下扬子区在由南向北的伸展拆离与多米诺式拉张断陷构造作用下,受到了第Ⅲ期的变形改造。这3期构造变形作用促使扬子板块海相油气的早期聚集、晚期热演化和再分配。文中将重点讨论下扬子区板内海相古生界盆地自中三叠世末以来所经历的3期不同性质构造作用的改造变形。 相似文献
14.
Jonathan D. Radley 《Geology Today》2006,22(3):109-118
The Wealden strata of southern England provide a range of evidence for Early Cretaceous non-marine environments and their inhabitants, and a climate of warm to hot, 'Mediterranean' aspect. Because of its exposure, and its range of facies, distinguishing a variety of sedimentary environments, the Wealden has long fascinated geologists intent on providing an environmental model. This article is one of two intended to give an overview of Wealden environments, providing the geological framework of these strata. In this article, the type-succession in the Weald Sub-basin of south-east England is summarized and briefly interpreted. 相似文献
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本文介绍了中国中东部白垩纪沙漠沉积的时空分布，探讨了时空分布规律，认为：（１）中东部白垩纪沙漠分布严格受气候带控制，其实际分布限于北纬２０—４０°的干旱带（横跨当时的副热高压带），主要分布于鄂尔多斯盆地、四川盆地、江汉盆地和苏北盆地之中；（２）各盆地沙漠发生的时间不同，鄂尔多斯盆地为早白垩世，四川盆地为中白垩世晚期，江汉盆地为晚白垩世早期，苏北盆地为晚白垩世中期，（３）沙漠发生的穿时性反映了各盆地进入干旱带的顺序，由北到南，由西及东；（４）造成这种顺序的原因是由于亚洲在白垩纪时其总体为顺时针旋转，因而使西北部鄂尔多斯盆地率先进入干旱带，其次是西南部的四川盆地，然后是中部的江汉盆地。晚白垩世的降温事件迫使干旱带南移而使其滞后的最东部的苏北盆地进入干旱带，（５）中国白垩纪沙漠的存在说明处于“温室效应”的大气环流不仅不会“呆滞”而且还有所增强，季风的存在也说明当时的气候并不均一。本文提出了气候带漂变（ｃｌｉｍａｔｉｃｚｏｎｅｄｒｉｆｔ）的概念，认为气候变化的表现形式为气候带漂变。漂变既有长周期和短周期漂变之分，又有相对和绝对漂变之别。中国中东部白垩纪沙漠的时空变迁就是干旱气候带漂变的结果。 相似文献
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沉积盆地的层序和沉积充填结构及过程响应 总被引：13，自引：4，他引：9
现代层序地层学的理论发展,把沉积过程纳入到地质演化的时空框架中并与地球的多旋回或节律演化结合研究,形成了一套带有革命性的、在等时地层格架中研究沉积作用的新方法,成为了油气资源等沉积矿产预测勘探的重要工具。沉积盆地的沉积充填可划分出与各级沉积旋回相对应的层序地层单元。追踪对比由不整合面或不整合面及其对应的整合面为界的高级别层序地层单元建立的区域性等时地层格架,对盆地构造古地理再造和油气勘探战略性研究至关重要;追踪四、五级等低级别层序地层单元和体系域建立的高精度层序地层格架,可为重点区域或区带的沉积体系和储集体的沉积构成和分布等的解剖提供精细的地层对比基础。依据沉积基准面的变化,从层序内水进到水退的沉积旋回中可划分出正常水退沉积、强制性水退沉积、水进沉积及垂向加积等成因沉积类型。海相或湖相盆地中三级层序地层单元内均可较好地划分出低位、水进、高位及下降体系域。盆地构造作用、气候变化、海、湖平面升降过程对层序发育的控制作用及沉积响应研究,一直是层序地层学或沉积地质分析领域的研究热点。沉积盆地的层序地层序列演化是盆地地球动力学过程的总体响应。层序地层学把盆地古构造、古地理的变迁纳入到统一的地球演化系统中研究,形成了与区域地球演化史或盆地动力学演化相结合的重要研究领域。多旋回盆地或叠合盆地中多期次的构造变革导致了多个区域性不整合面所分隔的多个构造层序的叠加。注重构造—层序地层的结合分析,揭示盆地的层序地层序列与多期盆地构造作用的成因联系,是构造活动盆地或大型叠合盆地沉积地质演化和油气聚集规律研究的关键。盆地构造作用,如前陆盆地多期次的逆冲挠曲沉降和回弹隆起的构造作用、多幕裂陷过程、多期构造反转等与重要不整合及区域性沉积旋回或层序的形成密切相关;而由气候变化引起的海或湖平面变化是控制高频沉积旋回或低级别层序发育的主要因素。在构造活动盆地中,构造坡折带对沉积体系域和沉积相的发育分布具重要控制作用。 相似文献
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南海南、北陆缘中生代构造层序及其沉积环境 总被引：1，自引：0，他引：1
新生代海底扩张,使南海陆缘分为南、北两部分。南部礼乐地块与南海北缘在扩张之前构成了统一的活动陆缘。通过对南、北陆缘的钻井研究和井旁地震剖面解释,发现二者的中生界均具有4 个地震层序及3 个构造层。南北陆缘构造层序及物源分析表明,早白垩世礼乐地块与南海北缘曾发生碰撞拼贴。早白垩世的南海北缘地区沉积环境由海陆过渡相向陆相演化,相应的礼乐地区是由浅海相向滨海相演化,二者反映出相同的向上变浅旋回,说明在南、北陆缘拼贴之后,两者具有了统一的构造沉积背景。到晚白垩世末,两区均隆升为陆,且遭受剥蚀; 南海北缘地区上白垩统部分被剥蚀,而距俯冲边界更近的礼乐地区上白垩统则被剥蚀殆尽。 相似文献
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Tertiary Sea Level Changes and Sequence Stratigraphic Framework in East China Sea Shelf Basin 总被引：1，自引：0，他引：1
ＴｈｅＥａｓｔＣｈｉｎａＳｅａｓｈｅｌｆｂａｓｉｎｉｓｓｉｔｕａｔｅｄｏｎｔｈｅｗｅｓｔｍａｒｇｉｎｏｆＰａｃｉｆｉｃｐｌａｔｅ（Ｆｉｇ．１）ａｎｄｉｓａｌａｒｇｅｈｙｄｒｏｃａｒｂｏｎ－ｂｅａｒｉｎｇｓｅｄｉｍｅｎｔａｒｙｂａｓｉｎｆｉｌｅｄｍａｉ... 相似文献
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覆盖区侏罗—白垩系分布、变形特征及构造演化对理解华北克拉通破坏过程具有重要意义。根据编制的地层分布图和地震资料解释,研究了渤海海域侏罗—白垩纪时期沉积、构造变形及演化特征。渤海海域燕山期构造变形与板块俯冲引起的地幔上拱有关。早-中侏罗世,库拉—伊泽奈崎板块北西向俯冲,地层展布继承了印支期古构造格局,呈近东西向,属于坳陷成盆期。晚侏罗—早白垩世,库拉—伊泽奈崎板块北北西向俯冲,火山活动强烈,为热拱断陷期。受郯庐断裂左行活动影响,地层展布具有明显分带性,多呈北东—南西向和北西西—南东东向。晚白垩世,太平洋板块北西向俯冲挤压,岩浆冷凝,进入萎缩隆褶期。 相似文献