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1.
渤海海域晚更新世—全新世的活动构造 总被引:2,自引:0,他引:2
利用在渤海最新获得的约5 000 km的浅层地震资料,发现在渤海海域发育大量晚更新世—全新世断裂和褶皱,进而对其分布、浅层结构、运动学性质和活动性进行了研究,绘制了渤海海域活动断裂分布图。研究结果表明:渤海晚更新世—全新世活动断裂主要走向为北北东向、北西向和近东西向,东西向断裂数量最多;断裂的形成受区域应力场和早期断裂的控制,而褶皱则以背斜居多,通常沿早期断裂带发育;就分布密度而言,辽东湾内断裂密度远小于其他海域,而同一构造单元其边界部位断裂密度大于单元内部;具继承性发展的断裂多具有复杂的破裂结构,破裂带剖面上呈耙形或"Y"字型,晚更新世沉积层变形明显;受断裂错动地层的形成时代表明,多数断裂的最新活动发生在晚更新世中期-晚期,部分断裂在全新世发生过活动;多数断裂具有明显正断拉张作用,而郯庐断裂带和张家口-蓬莱断裂带内次级断裂还可能具走向滑移分量;渤海浅层断裂的活动性与现代地震震中的分布具有较好的相关性,这对于渤海地震危险性评价具有重要意义。 相似文献
2.
利用在渤海最新获得的约5 000 km的浅层地震资料,发现在渤海海域发育大量晚更新世—全新世断裂和褶皱,进而对其分布、浅层结构、运动学性质和活动性进行了研究,绘制了渤海海域活动断裂分布图。研究结果表明:渤海晚更新世—全新世活动断裂主要走向为北北东向、北西向和近东西向,东西向断裂数量最多;断裂的形成受区域应力场和早期断裂的控制,而褶皱则以背斜居多,通常沿早期断裂带发育;就分布密度而言,辽东湾内断裂密度远小于其他海域,而同一构造单元其边界部位断裂密度大于单元内部;具继承性发展的断裂多具有复杂的破裂结构,破裂带剖面上呈耙形或"Y"字型,晚更新世沉积层变形明显;受断裂错动地层的形成时代表明,多数断裂的最新活动发生在晚更新世中期-晚期,部分断裂在全新世发生过活动;多数断裂具有明显正断拉张作用,而郯庐断裂带和张家口-蓬莱断裂带内次级断裂还可能具走向滑移分量;渤海浅层断裂的活动性与现代地震震中的分布具有较好的相关性,这对于渤海地震危险性评价具有重要意义。 相似文献
3.
依据最新的高分辨率单道地震测网,结合前人研究成果,编制了渤海中西部海域中更新统、上更新统、全新统和中更新统以来的地层厚度图,揭示受到喜马拉雅造山运动的影响,区域应力场从岩石圈热沉降中的裂后弱伸展环境转变为北东东—东西向水平挤压应力场,第四纪以前以渤中凹陷和歧口凹陷中北部为沉降中心差异沉积,早更新世和中更新世,张家口-蓬莱断裂带与秦皇岛-旅顺断裂带沿NW向左旋走滑,发生显著差异沉降,沉降中心北移,并被秦皇岛-旅顺断裂所控制,等厚度线整体呈NW向。共轭NE向新生庙西北-黄河口断裂带发育活动并发生右旋剪切平移,郯庐断裂南段由于其北北东走向受到区域应力场的抑制至少在中更新世以前便失去整体活动性。晚更新世和全新世,区域受喜马拉雅造山运动影响显著减弱,以区域整体沉降和均衡沉降为主,断裂活动减弱,数量也大大减少。 相似文献
4.
利用SEABAT8111多波束系统在南海西南部珊瑚礁区海域进行地形地貌探测,同时还进行了单道和多道地球物理调查。探测表明该区珊瑚礁礁体的活动断裂主要有NE、NW、SN向3组。NE向断裂主要分布在岛礁区内,是晚燕山期南海第一次海底扩张时形成的断裂系,强烈活动于晚白垩世—始新世,晚第三纪以来继承性活动,以张剪性断裂为主,现今活动性中等至弱。NW向断裂主要分布在曾母盆地,以张剪性断裂为主,切割至基底,强烈活动于渐新世至上新世,构成了曾母盆地的主要张裂期,第四纪仍有活动,均为弱活动断裂。SN向断裂主要有南海西部的滨海断裂带,它是南海SN向扩张时期的转换断层,具张剪性,为中活动断裂,是南海西南部珊瑚礁区活动性较强的断裂,该断裂带历史上曾有火山活动和地震活动的记录。 相似文献
5.
永昌南山位于河西走廊东段,北麓受丰乐断裂控制。丰乐断裂是祁连山东北缘冲断带的重要组成部分, 其晚第四纪活动地表行迹西起西大河东到西营河,2期普遍发育地貌面被错断并形成明显断层陡坎。用无人机对杜家团庄、周家庄、西营河河口3个地点进行航空测量,生成数字高程模型(DEM),提取各阶地和洪积扇的断层陡坎剖面,并对断层上下盘面进行线性拟合,计算得到了不同位置的垂直断距。在杜家团庄洪积扇T1和东大河阶地T3砾石层顶部采集黄土样品,用光释光方法测得年龄分别为(19.30±2.45)ka和(27.40±2.47)ka,结合前人测年结果,认为永昌南山北麓普遍发育的两期地貌面年龄分别为19.3~16.3ka和29.9~27.4ka,两期地貌面均形成于气候由冷变暖的过渡阶段。利用地貌面陡坎的位错量和年代数据,得到晚更新世以来丰乐断裂在杜家团庄处的垂直滑动速率为0.65~0.82mm/a,在周家庄处的垂直滑动速率为0.60~0.76mm/a,在西营河河口处的垂直滑动速率为1.99~2.56mm/a。 相似文献
6.
黄福林 《海洋地质与第四纪地质》1992,12(4):21-28
本文初步讨论了区内活动断裂的时空展布及一般特征,NNE—NE向继承性活动断裂是渤海海域及沿海大陆的主导构造,北黄海断裂活动与渤海相似,南黄海则以NEE向为主,苏北陆地及其近海兼有NNE—NE和NW向。资料表明,断裂的水平运动量大于垂直运动量,从各自的沉积厚度所估算的沉积速率说明早、晚第三纪和第四纪的构造强度是很近似的,因而华北和渤海区由走滑正断层反映的水平运动和差异升降运动仍处于十分活跃的发展阶段。 相似文献
7.
8.
渤海海域郯庐断裂带的地质构造特征 总被引:1,自引:0,他引:1
郯城-庐江断裂带纵贯我国东部,北起黑龙江省,南至安徽省并继续向南延伸,在我国境内长达三千余公里。本文主要讨论渤海海域中的一段,即北起辽宁营口,南至山东潍坊,长约五百公里。为了讨论的方便,我们将其称为营潍断裂带。该带完全被海水或第四纪地层复盖。对它的了解过去只是根据周边地质情况予以推断,自航磁工作开展以来,对此问题的认识有所深入,认为该断裂带自山东向北延入莱州湾属于深断裂性质,继续北延,虽仍为大断裂存在但由于无岩浆活动,而被认为属“干断裂”性质。随着海洋石油勘探事业的发展,近十几年来在渤海海域进行了重力、磁力、地震综合物探普查 相似文献
9.
为探索蓬莱19-3油田西北斜坡带的勘探潜力,根据邻区已钻井和精细的地震资料解释,采用断裂几何样式分析及构造恢复方法对蓬莱19-3油田西北斜坡带的断裂成因、构造演化及其控藏作用进行分析。结果显示:在平面上主要发育NE(NNE)向及NW(近EW)向断层,其走向、倾向及垂向上的搭接关系主要受区域应力及地层厚度等因素控制,在不同构造部位体现不同的特征。揭示了3个关键期区域构造应力在本区的叠加,即早白垩世(燕山期中期)的拉张,始新世晚期的右行走滑及上新世—第四纪新构造运动的拉张。早白垩世发育的基底先存断裂控制了古构造脊的形成,为本区油气横向输导提供必要条件,上新世—第四纪新构造运动发育的贯通式切脊断裂是油气的垂向运移的有利通道,其活动期是渤海重要的成藏期,预示本区具有良好的勘探潜力。 相似文献
10.
渤海海域构造应力场演化及其在油气聚集中的作用 总被引:3,自引:0,他引:3
渤海海域位于渤海湾盆地东部,在盆地区域动力学背景下,形成了渤海海域特征的沉积和构造环境。渤海海域新生代具有早期断陷、后期拗陷的特点,断裂以NE-NNE走向为主,其次是EW走向,再次是NW走向。通过区域构造演化和沉积体系的深入研究,将海域新生代地质构造活动按构造应力的方向、大小和其他构造形变参数划分为4个期次:①古新世;②始新世-渐新世;③中新世-早更新世;④晚更新世至今。在一系列构造演化过程中,构造应力场的变化对海域内的3组主要断裂具有重要的影响。不同方向的断裂在不同阶段应力场的作用下,所表现的特征和对油气的控制作用是不同的,尤其是NNE-NE向断裂在构造演化过程中多次具有走滑活动,油气主要聚集在走滑作用所派生的局部圈闭或附近存在的构造弱化带中。 相似文献
11.
印支运动为现今渤海海域构造格局的形成奠定了基础,导致渤海海域内部发育3个主要逆冲带。渤海基底内部的先存断层与滑脱层在此过程中可能起到了极为重要的作用,但其如何影响渤海海域印支期的构造变形与分带特征的机制尚不清楚。为了解决上述问题,本文基于地震剖面数据,结合二维热力学数值模拟代码LaMEM对渤海海域印支期的构造变形展开了详细研究。模拟结果揭示,在先存断层存在的条件下,当基底内部无滑脱层或未呈阶梯式在渤海海域分布时,渤海海域内部不会形成相应的逆冲中心;而当基底内部的滑脱层呈阶梯状分布在渤海海域西南部、渤中坳陷以及辽东坳陷3个区域时,应力通过滑脱层在基底内部进行传导,使海域形成了3个逆冲中心,并导致渤海内部大规模的逆冲断层与褶皱变形的发育,与地震剖面具有较好的一致性。数值模拟实验结果证实,基底内部的先存断层与滑脱层是控制渤海海域构造分带性及构造变形特征的重要因素。同时,多逆冲中心演化模式也为解释现今龙门山和四川盆地的形成与演化过程提供了重要的借鉴。 相似文献
12.
Onshore and offshore seismic and geologic-morphologic evidence from the wider region of the ?anakkale Basin indicates that this area has been widely exposed to transpressional tectonism, which already commenced in the Pliocene. During this transpressional tectonism, the Gelibolu Fault and the Anafartalar Shear Zone on the Gelibolu Peninsula, as well as the Bozcaada-Biga Shear Zone on the Biga Peninsula were activated. As a consequence, the northern part of the Gelibolu Peninsula, and a broad zone between Bozcaada Island and the Karaburun Peninsula were uplifted to form the northern and southern boundaries of the ?anakkale Basin, respectively. This remained a low-elevation intermontane basin between these two highlands. The original morphology of the ?anakkale Basin may have developed as a coastal and shelf section of the large extensional Marmara Sea Basin at the end of the Late Miocene. This tectonic phase was followed in the Pliocene by the transpressional tectonism of the North Anatolian Fault Zone, which destroyed the initial morphology and formed the present V-shaped basin. The activity of the Gelibolu Fault and the Anafartalar Shear Zone along the northern boundary of the ?anakkale Basin ended in the late Pleistocene with the initiation of the northern segment of the North Anatolian Fault Zone. The tectonism along the northern boundary of the ?anakkale Basin thus shifted from a transpressional to a transtensional regime. Seismic data indicate that the Bozcaada-Biga Shear Zone continues to be active to the present day. 相似文献
13.
郯庐断裂带自南而北穿越渤海东部,自中生代中期至新生代中期表现裂谷发育特征。裂谷发育经历两个旋回,各旋回的裂谷发育演化、盆地分布格局,沉积相带,沉积补偿速度等均受断裂带的断裂活动的强烈控制。 相似文献
14.
渤海新构造运动对渤海东部油气性质的影响 总被引:1,自引:0,他引:1
郯庐断裂带控制了渤海东部凹陷、凸起的形成、演化,也控制了烃源岩、储盖层及圈闭的展布,进而影响了渤海东部地区油气的性质。郯庐断裂带在渤东地区的强烈构造作用,使得该地区油气勘探变得很复杂,同时也使得油气性质变得更加难以进行分类。因此,准确分析该地区的构造作用方式(特别是渤海新构造的晚期运动方式)以及断裂带对该地区地层油气的影响方式,有助于准确分析郯庐断裂带在渤海湾地区对油气成藏的影响,有助于今后的油气勘探。 相似文献
15.
红河活动断裂带在南海西北部的反映 总被引:6,自引:0,他引:6
红河断裂带是一条走滑的活动断裂带,它控制着南海西北部的构造活动,也控制着莺歌海盆地的形成和演化。根据南海西北部中穿过莺歌海盆地的地震剖面和历史资料进行解释,结果表明,莺歌海盆地的形成可分3个阶段:自50MaB.P.开始,沿红河断裂带的左旋错动和在印支地块的顺时针旋转的应力作用下,形成了莺歌海盆地的雏形;24MaB.P.之后在左旋压扭应力场作用下,形成了盆地西北部的反转构造;5MaB.P.之后发生了右旋错动,盆地内快速沉降,发育巨厚沉积层。根据盆地内最老和最新的沉积中心之间的距离,推测沿红河断裂带的左旋位错约200km。该断裂带发展到现代,其活动性大为减弱,曾发生10次小于5级地震。 相似文献
16.
The North Anatolian Fault crosses the Sea of Marmara from east to west. Tectonic features of the Sea of Marmara were studied
using multi-channel deep seismic reflection data. The northern branch of the North Anatolian Fault is active as a right lateral
strike-slip fault zone and indicates both negative and positive flower structures. The North Anatolian Fault splays into two
faults at the Sea of Marmara as a northern branch and north segment of the southern branch. The northern branch named the
Main Marmara Fault extends in a complicated manner from the north of the Kapıdağı Peninsula to westward in the Sea of Marmara.
The north segment of southern branch extends between the Gemlik and Bandırma gulfs in the south of the Sea of Marmara. In
addition, uplift areas arose by compression and a push-up style in between the Kapıdağı Peninsula and the Main Marmara Fault.
The North Anatolian Fault is characterized by a negative flower structure in basins and push-up style in uplift areas in the
Sea of Marmara. An uplift area arose between the north segment of the southern branch and the northern branch of the North
Anatolian Fault. The north segment of the southern branch of the North Anatolian Fault is a strike-slip fault and displays
a pull-apart style in the seismic reflection data. 相似文献
17.
Leo Armada Shu-Kun Hsu Chia-Yen Ku Wen-Bin Doo Wen-Nan Wu Carla Dimalanta Graciano Yumul Jr. 《Marine Geophysical Researches》2012,33(4):369-377
The Philippine Fault Zone, a system of left-lateral strike-slip faults traversing the length of the Philippine Islands, is associated with the oblique convergence between the Philippine Sea Plate (PSP) and the Eurasian Plate (EP). Although it is a major deformational structure within the diffuse PSP–EP convergent boundary, some of its segments, particularly its marine extensions, are not well studied. To investigate the crustal deformation in the marine prolongation of the Philippine Fault Zone offshore Luzon Island, multi-channel seismic (MCS) data, gravity data and centroid moment tensor solutions were used in this study. Focal mechanism solutions from the Global CMT catalog were inverted to determine the average principal stress directions and consequently understand the prevailing stress regime in the study area. The stress inversion results indicate that the direction of maximum compression (σ1) is 321°N, which coincides with the PSP–EP convergence direction. From the MCS profiles, the study area was subdivided into deformation zone and a relatively stable zone. Thrust faulting, folding and general uplift are observed in the deformation zone. This zone is further subdivided into the active and inactive segments. In the active segment, uplift is occurring in the submarine ridge. This deformation pattern can be related to the ongoing uplift in some regions bisected by the PFZ. The inactive segment, characterized by intense folding of the sequences and faulting of the basement and overlying sequences, is suggested as the precursor of the Philippine Fault Zone. Deformation appears to be recently shifted to the east as delineated by an uplifted N-NW trending submarine ridge offshore NW Luzon Island. 相似文献
18.
Neslihan Ocako?lu 《Geo-Marine Letters》2012,32(1):17-28
New (2009) multi-beam bathymetric and previously published seismic reflection data from the NE-SW-oriented Fethiye Bay and
the neighboring N-S-oriented Marmaris Bay off SW Anatolia were evaluated in order to interpret the seafloor morphology in
terms of the currently still active regional tectonic setting. This area lies between the Pliny Trench, which constitutes
the eastern sector of the subduction zone between the African and Eurasian plates in the Eastern Mediterranean, and the Fethiye-Burdur
Fault Zone of the Anatolian Plate. The bathymetric data document the very narrow shelf of the Anatolian coast, a submarine
plain between the island of Rhodes and Marmaris Bay, and a large canyon connecting the abyssal floor of the Rhodes Basin with
Fethiye Bay. The latter are here referred to as the Marmaris Plain and Fethiye Canyon, respectively. Several active and inactive
faults have been identified. Inactive faults (faults f1) delineate a buried basin beneath the Marmaris Plain, here referred
to as the Marmaris Basin. Other faults that affect all stratigraphic units are interpreted as being active. Of these, the
NE-SW-oriented Marmaris Fault Zone located on the Marmaris Plain is interpreted as a transtensional fault zone in the seismic
and bathymetric data. The transtensional character of this fault zone and associated normal faults (faults f3) on the Marmaris
Plain correlates well with the Fethiye-Burdur Fault Zone on land. Another important fault zone (f4) occurs along the Fethiye
Canyon, forming the northeastern extension of the Pliny Trench. The transpressional character of faults f4 inferred from the
seismic data is well correlated with the compressional structures along the Pliny Trench in the Rhodes Basin and its vicinity.
These observations suggest that the Marmaris Fault Zone and faults f3 have evolved independently of faults f4. The evidence
for this missing link between the Pliny Trench and the Fethiye-Burdur Fault Zone implies possible kinematic problems in this
tectonic zone that deserve further detailed studies. Notably, several active channels and submarine landslides interpreted
as having been triggered by ongoing faulting attest to substantial present-day sediment transport from the coast into the
Rhodes Basin. 相似文献
19.
渤海的地质演化与断裂活动 总被引:3,自引:0,他引:3
李延成 《海洋地质与第四纪地质》1993,13(2):25-34
本文将渤海的地质演化分为:前中生代、中生代和新生代三大时期,并论述各个时期的构造特征和地层分布。渤海的断裂系统主要有北北东—北东、近东西和北西向三组,每组断裂既有其各自的发生、发展规率,同时彼此之间又有一定的关联。 相似文献