共查询到18条相似文献，搜索用时 968 毫秒
1.
2.
琼东南盆地新生代发育机制的模拟研究 总被引：5，自引：0，他引：5
琼东南盆地是南海西北陆缘上一个北东走向的伸展裂陷带,向西与北西走向的莺歌海盆地相接,因此其构造演化包含了较多红河断裂走滑活动的信息。综合地质分析与物理模拟实验,我们发现琼东南盆地的发育既受控于南海北部陆缘的南东向—南南东向伸展作用,而且受到红河断裂左行走滑作用的控制和影响。其中,中央坳陷带主要受控于南东至南南东向的伸展作用;南部坳陷带的发育主要受控于琼东南盆地的伸展及其沿北北西向边界断裂右行走滑作用的构造叠加;而北部坳陷带的发育主要受控于北西向断裂左行走滑作用。红河断裂左行走滑作用可能开始于晚始新世,晚于琼东南盆地的伸展裂陷作用,且早期走滑速率应小于琼东南盆地的伸展速率,早渐新世(T70)以后红河断裂左行走滑速率大于琼东南盆地伸展速率,导致琼盆西段的褶皱反转,以及一组北西—北北西走向张剪断裂的发育。 相似文献
3.
莺歌海盆地异常裂后沉降的动力学机制 总被引：1，自引：0，他引：1
为了理解莺歌海盆地形成与演化的动力过程, 用回剥法和应变速率反演方法对该区的钻井和地层剖面资料进行了研究.研究结果表明莺歌海盆地观测得到的裂后沉降和模拟预测的理论裂后沉降结果存在较大差异, 其中在西北部为300~500 m, 中部和东南部为900~1200 m, 其异常裂后沉降明显呈现向东南和向海方向递大的趋势.地幔对流模型预测的结果表明, 20 Ma以来南海北部边缘的动力地貌沉降量为300 m, 因此, 莺歌海盆地裂后异常沉降在300 m左右的地区可以用动力地貌沉降机理来解释, 但是盆地中部和东南部的巨厚的异常沉降远大于动力地貌沉降量, 它是自晚中新世以来盆缘断层的右旋走滑作用、裂后热回沉和动力地貌沉降共同作用的结果. 相似文献
4.
中国西南部红河断裂带的活动演化历史长期以来备受国内外学者的关注,该断裂从陆地向海域延伸进入莺歌海盆地,并对莺歌海盆地的形成和演化起重要的控制作用。目前,红河断裂带经历早期的左旋走滑运动和后期的右旋走滑运动已经得到公认,但对于其精细的构造演化历史及其左旋走滑向右旋走滑运动转换的时间还未能达成共识。本文利用构造控制沉积、沉积反映构造的思想,通过对莺歌海盆地三维地震资料的构造解析,从T27界面上下地层厚度存在"跷跷板"式的变化、沉积中心的迁移、沉积速率的变化、陆架-陆坡坡折带的出现、微小断裂的特征以及底辟构造等方面的研究,确定莺歌海盆地红河断裂带的左旋走滑运动停止于T40(10.5Ma);T40~T30(10.5~5.5Ma)是构造变形的平静期;T30~T27(5.5~2.4 Ma)为左旋走滑运动向右旋走滑运动转换时期;T27(2.4 Ma)以后右旋走滑活动开始,并控制坡折带(包括莺歌海盆地和琼东南盆地)和底辟构造等的形成;T20(1.9 Ma)以来,右旋走滑活动逐渐减弱。 相似文献
5.
天水盆地位于青藏高原东北缘高海拔挤压隆升区与鄂尔多斯低海拔伸展区的过渡部位,新构造活动强烈。然而,新构造活动对天水盆地的影响尚不清楚。通过对盆地的沉积环境、构造沉降、构造变形等方面的研究,结果显示:1盆地由风成堆积、洪积扇、河湖相与湖泊相沉积组成,代表沉积中心的河湖相与湖泊相沿控盆断裂(西秦岭北缘断裂、西和断裂与礼县-罗家堡断裂)分布;2盆地经历了16~14Ma、9.2~7.4Ma和3.6~2.6Ma三次加速沉降期;3控盆断裂在同沉积期为正断层。沉积中心沿断裂分布、快速沉降事件及生长正断层表明,天水盆地至少在中新世晚期受控于走滑伸展构造,记录了青藏高原向北东方向的构造挤出作用。 相似文献
6.
南海大陆边缘盆地构造演化差异性及其与南海扩张耦合关系 总被引：3，自引：0，他引：3
南海大陆边缘盆地由于边界条件的差异,不仅形成了不同类型的陆缘盆地,如离散型、走滑伸展型和伸展挠曲复合型,而且这些盆地构造演化存在明显的非同步性。这些陆缘破裂过程与南海扩张作用过程呈现明显不一致性。研究表明,南海扩张时期南海南、北大陆边缘均形成了一系列裂陷盆地,然而,南海南部、北部大陆边缘盆地裂陷作用结束时间不同,北部大陆边缘盆地裂陷作用结束于23 Ma或21 Ma,而南部大陆边缘盆地裂陷作用结束于15.5 Ma,显然北部大陆边缘盆地裂陷结束时间明显早于南部大陆边缘盆地。南海扩张停止后,南海南、北部陆缘仍表现出明显差异,北部陆缘仍以伸展作用为主,晚中新世以来出现快速沉降幕,而南海南部陆缘则以挤压作用为主,且其挤压时间及强度呈现南早北晚的特点,即南部曾母盆地明显早于南薇西盆地和北康盆地。南海南、北大陆边缘盆地形成演化的差异性,特别是构造转型差异变化,为新生代南海扩张的迁移性提供了有力的佐证,可以推断南海不同期次海盆扩张可能存在向南的突然跃迁。因此,本次研究梳理出的南海不同陆缘盆地张裂伸展的非同步性可为南海洋盆扩张演化过程解释提供新的证据。 相似文献
7.
红河断裂带大型右旋走滑运动定量研究的若干问题 总被引：8，自引：0，他引：8
通过卫航片解释、野外地质调查和相关年代学研究与综合前人已有资料分析,阐明了红河断裂带作为一个整体自中新世以来大规模右旋位错的地质依据,论述红河断裂带在几何学、运动学和年代学等方面的基本特征,探讨了红河断裂带后期大规模右旋走滑运动与青藏高原隆升间的某些相关性。研究表明:中新世以来,红河断裂带大规模右旋走滑运动在北段区主要表现为尾端拉张伸展——构成典型的滇西北裂陷盆地区,且自中新世经上新世至第四纪,伸展型盆地由西北向东南扩展;中段区为典型的右旋走滑变形区,燕山晚期花岗岩体、上新世煤盆及礼社江水系均显示为同步右旋位错。上新世以来右旋位错量达30～32km;南段带内由山前水系右旋位错和断裂谷内右旋“撕裂”变形为主要特征。从中新世经上新世至第四纪,与山体快速隆起相伴的断陷盆地有从东南向西北扩展的趋势。根据地质研究结果,并结合区内K-Ar、FT和SEM测年资料分析,可以初步认为,红河断裂带大型右旋走滑运动开始于8～7Ma,强烈活动于5Ma±。 相似文献
8.
渤海湾盆地莱州湾凹陷新生代盆地演化 总被引：15，自引：0，他引：15
利用莱州湾凹陷及其围区现有的地震、钻井等勘探资料,通过地层展布特点分析、构造恢复、单井埋藏史-沉降史分析等手段,对凹陷的新生代构造演化进行了详细研究。对地层与构造的研究分析发现,新生代存在两期构造应力场变革对莱州湾凹陷的形成演化起到至关重要的作用,即沙三期前后应力场转换(40Ma左右)与古近纪、新近纪之间的应力场转换(20Ma左右),其中前者与郯庐断裂由左旋转为右旋这一事件相耦合,而可能与之具有一定内在联系。对于盆地性质的分析认为,莱州湾凹陷并非典型的右旋走滑拉分盆地,而是受走滑作用影响的以伸展作用主控的裂谷盆地,其中沙三期之前可能为左旋走滑影响下的断陷盆地,而之后则为右旋走滑作用改造下的断陷-坳陷盆地。综合分析后,最终将凹陷在新生代的演化分为断陷期(孔店-沙四期—沙三期)、断拗期(沙二-沙一期—东营期)、坳陷期(东一期—馆陶期)、新构造活动影响期(明化镇期至今)4个阶段。 相似文献
9.
利用莱州湾凹陷及其围区现有的地震、钻井等勘探资料,通过地层展布特点分析、构造恢复、单井埋藏史-沉降史分析等手段,对凹陷的新生代构造演化进行了详细研究.对地层与构造的研究分析发现,新生代存在两期构造应力场变革对莱州湾凹陷的形成演化起到至关重要的作用,即沙三期前后应力场转换(40Ma左右)与古近纪、新近纪之间的应力场转换(20Ma左右),其中前者与郯庐断裂由左旋转为右旋这一事件相耦合,而可能与之具有一定内在联系.对于盆地性质的分析认为,莱州湾凹陷并非典型的右旋走滑拉分盆地,而是受走滑作用影响的以伸展作用主控的裂谷盆地,其中沙三期之前可能为左旋走滑影响下的断陷盆地,而之后则为右旋走滑作用改造下的断陷-坳陷盆地.综合分析后,最终将凹陷在新生代的演化分为断陷期(孔店-沙四期—沙三期)、断拗期(沙二-沙一期—东营期)、坳陷期(东一期—馆陶期)、新构造活动影响期(明化镇期至今)4个阶段. 相似文献
10.
莺歌海盆地周边区域构造演化 总被引：42，自引：0，他引：42
莺歌海盆地周边新生代区域构造演化综合分析表明，该舅地形成和演化构造应力场分四个阶段：第一阶段，古新世末至早渐新世印支地块快速向南东方向挤出，同时伴随着地块的顺时针旋转运动。第二阶段，晚渐新世至早中新世印支地块向南东挤出运动逐渐减弱，华南地块整体仍然相对稳定。莺歌海盆地处于左旋剪切状态。第三阶段，中、晚中新世随着印度地块逐渐楔入欧亚板块内部，印支半岛的挤出运动进一步减弱。至中中新世末，华南地块整体开始挤出。第四阶段，上新世一第四纪印支地块相对稳定，华南地块挤出运动继续进行，两地块间的相对运动呈右旋剪切运动。莺歌海盆地新生代的构造应力场演化受太平洋板块、印度与欧亚板块之间相互作用控制。其中，印度与欧亚板块碰撞作用所导致的印支地块与华南地块的相对运动，是决定莺歌海盆地新生代构造运动应力场变化的主要因素。 相似文献
11.
Experimental evidence for the dynamics of the formation of the Yinggehai basin, NW South China Sea 总被引：1，自引：0，他引：1
The Yinggehai basin is located on the northwestern shelf of the South China Sea. It is the seaward elongation of the Red River Fault Zone (RRFZ). The orientation and rift shape of the Yinggehai basin are mainly controlled by NW-, NNW- and nearly NS-trending basal faults. The depocenter migrated southeastward when the basin developed. The depocenter trended northwest before about 36 Ma, then jumped southward and became nearly N–S trending and migrated toward the southeast up to 21 Ma; thereafter, the depocenter trended northwest again. Based on above and structural evolution in neighbor areas, it is believed that the Yinggehai basin formation was mainly controlled by the extrusion accompanied by clockwise rotation of Indochina. We set up analogue models (thin basal plate model and thick basal plate model) to investigate the evolution of Yinggehai basin. From the experiments, we consider that the basin evolution was related to the extrusion and clockwise rotation of the Indochina block, which was caused by the collision of the Indian plate and Tibet. This process took place in four main stages: (1) Slow rifting stage (before 36 Ma) with a NW-trending depocenter; (2) rifting stage formed by sinistral slip of the Indochina block accompanied by rapid clockwise rotation between 36 and 21 Ma; (3) rifting-thermal subsidence stage affected by sinistral slip of the Indochina (21–5 Ma) block and (4) dextral strike–slip (5–0 Ma). 相似文献
12.
EARTHQUAKE FOCAL MECHANISM AND ITS TECTONIC SIGNIFICANCE ALONG THE TWO SIDES OF THE RED RIVER FAULT ZONE 总被引：1，自引：0，他引：1
The Red River Fault Zone is a gigantic slide-slip fault zone extending up to 1000km from Tibet to South China Sea. It has been divided into the north, central and south segments according to the difference of the geometry, kinetics, and seismicity on the land, but according to the contacted relationship between the old pre-Cenozoic block in Indochina Peninsula and the South China block, the Red River Fault Zone was divided into two parts extending from land to ocean, the north and south segments. Since the Tertiary, the Red River Fault Zone suffered first the sinistral movement and then the dextral movement. The activities of the north and the south segments were different. Based on the analysis of earthquakes and focal mechanism solutions, earthquakes with the focus depths of 0-33km are distributed over the whole region and more deep earthquakes are distributed on the northeastern sides of the Red River fault. Types of faulting activities are the thrust in the northwest, the normal in the north and the 相似文献
13.
通过在红河两侧（大姚、景谷、江城、勐腊剖面）的早第三纪古地磁样品的研究，进一步证实了红河两侧由白垩纪古地磁研究所揭示的印支地块相对于华南地块存在的左旋相对运动。这一结果说明了印度支那地块在印度板块的挤压下，于早第三纪至中新世沿红河大断裂发生向南侧向滑移达1000km左右，它不仅使青藏高原的巨大构造缩短得到调整，而且在北部湾地区形成伸展构造，并引起南中国海的张开。印度支那地块北部各地区的差异性旋转和红河断裂共轭的剪切断裂系的发育，以及红河大断裂早第三纪至中新世左旋剪切作用密切相关。 相似文献
14.
鄂尔多斯盆地周边地带新构造演化及其区域动力学背景 总被引：21，自引：0，他引：21
系统研究了松辽盆地泰康地区青山口组沉积相类型及沉积特征.对其中青一段与青二、三段的沉积相平面分布与垂向演化规律做了较深入的探讨.青山口组主要发育湖泊相与三角洲相2种沉积相类型,湖泊相包括2种亚相与4种微相,三角洲相包括2种亚相和2种微相.青一段以深湖、半深湖相泥岩沉积为特征,青二、三段以浅湖相与三角洲相砂泥岩互层为特征.区内青山口组主要存在3种类型的储层砂体,分别为三角洲前缘河口坝砂体、三角洲前缘远砂坝砂体和浅湖砂体,其中浅湖砂体是最好的含油砂体,浅湖砂体发育的优势区也即浅湖沉积亚相发育区是区内最重要的油气富集区,是今后油气勘探的有利地区 相似文献
15.
<正>The Ailao Shan-Red River fault zone is the boundary between the Yangtze block to the northeast and the Indochina block to the southwest.It is an important tectonic zone due to its role in the southeastward extrusion of the Indochina block during and subsequent to the Indian-Eurasian collision.Diancang Shan(DCS) high-grade metamorphic complex,located at the northwest extension along the Ailao Shan-Red River(ASRR) shear zone,is a representative metamorphic complex of the ASRR tectonic belt.Structural and microstructural analysis of sheared rocks in the high-grade metamorphic rocks reveals that they are coherent with solid-state high-temperature ductile deformation,which is attributed to left-lateral shearing along the ASRR shear zone.New LA-ICP-MS zircon U-Pb geochronological and microstructural studies of the post-kinematic granitic plutons provide a straightforward time constraint on the termination ductile left-lateral shearing and exhumation of the metamorphic massif in the ASRR shear zone.It is suggested that the left-lateral shearing along the ASRR shear zone ended at ca.21 Ma at relative lower-temperature or decreasing temperature conditions.During or after the emplacement of the young dikes at ca.21 Ma,rapid brittle deformation event occurred,which makes the DCS massif start fast uplift/exhumation and cooling to a shallow crustal level. 相似文献
16.
Te-Hsien Lin Ching-Hua Lo Sun-Lin Chung Fang-Jui Hsu Meng-Wan Yeh Tung-Yi Lee Jian-Qing Ji Yi-Zhau Wang Dunyi Liu 《Journal of Asian Earth Sciences》2009,34(5):674-685
We conducted a comprehensive 40Ar/39Ar geochronological study of the Jiali and Gaoligong shear zones to obtain a better understanding of crustal deformation and tectonic evolution around the Eastern Himalayan Syntaxis (EHS). The new age data reveal that the main phase of deformation in the Jiali and Gaoligong shear zones occurred from 22 to 11 Ma and from 18 to 13 Ma, respectively. Structural data collected during this study indicate that the Jiali shear zone underwent a change in shear sense from sinistral to dextral during its movement history. Based on a comparison with the deformation histories of other major shear zones in the region, we argue that the initial sinistral motion recorded by the Jiali shear zone was coincident with that of the Ailao Shan–Red River shear zone, which marked the northern boundary of the southeastward extrusion of the Indochina block during the Early Miocene. From the Middle Miocene (～18 Ma), the Jiali shear zone changed to dextral displacement, becoming linked with the dextral Gaoligong shear zone that developed as a consequence of continued northward indentation of the Indian continent into Asia. Since this time, the Jiali and Gaoligong shear zones have been united, defining the southwestern boundary of the EHS during clockwise rotation of the eastward-extruding Tibetan block, as revealed by recent GPS data. The temporal change in regional deformation pattern from southeastward block extrusion to clockwise rotation of crustal fragments may have played an important role in the development of the eastern Himalayan drainage system around the EHS. 相似文献
17.
Zhongxian Zhao Zhen Sun Haibo Huang Longtao Sun 《International Geology Review》2020,62(7-8):1019-1035
ABSTRACT The rapid uplift of the Tibetan plateau, the intense movement of the Ailao Shan-Red River Shear Zone (ARSZ), and the related climate change during the Cenozoic Indo-Asian collision have been widely studied; however, their timings varied considerably due to different data and methods used. As these events have been documented in the Red River sediment that came from the eastern Tibetan plateau and the Red River region and eventually deposited in the offshore Yinggehai and Qiongdongnan basins, here these events can be explored by calculating and analysing the Red River sediment budget, especially in the Qiongdongnan basin based on dense seismic profiles and wells. Results show that the Red River sediment mainly accumulated in the Yinggehai basin and the west part of the Qiongdongnan basin, and there are three sedimentary accumulation peaks in the Red River sediment budget during ~29.5–21, ~15.5–10.5, and ~5.5–0 Ma. By further comparing with previous studies on the timings of these events, it is inferred that the first sedimentary peak, prior to the onset of the monsoon intensification (~22 Ma), was probably driven by an intense left-lateral movement of the ARSZ in ~29.5–21 Ma. The second peak (~15.5–10.5 Ma), however, reflects a rapid uplift of the Tibetan plateau after the cessation of the left-lateral strike slip of the ARSZ. The third peak (~5.5–0 Ma) is most likely linked with a right-lateral movement of the ARSZ and the related climate change. Overall, the Red River sediment budget from the offshore Yinggehai and Qiongdongnan basins provides an important constraint on the timings of these tectonic events as well as the related climate change during the Cenozoic Indo-Asian collision. 相似文献
18.
郯庐断裂中段新生代右行走滑位移 总被引：2，自引：0，他引：2
依据走滑拉分盆地中盆地沉降（或抬升）速率与边界断层走滑速率之间的数值关系,通过对夹在郯庐断裂中段两分支断层间的潍北凹陷沉积埋藏史的恢复,间接求取郯庐断裂中段新生代右行走滑位移。潍北凹陷内不同构造位置4口井的埋藏史恢复结果表明：凹陷新生代经历了古近纪早、中期的快速沉降,古近纪末-新近纪初的抬升剥蚀和中新世以来的缓慢沉降3个阶段;各阶段的平均沉降速率分别为0.142 9、-0.072 8、0.032 5 km/Ma。通过对太平洋板块与欧亚板块间俯冲速率和方向变化的分析推断,中新世中期（39.5 Ma）太平洋板块由北西向俯冲转而变成正西向俯冲所产生的西南向应力分量是导致新生代郯庐断裂开始右行走滑的主要因素,且走滑活动持续至今。根据走滑活动发生和持续的时间,结合各个时期内潍北凹陷的沉降和抬升速率,计算出郯庐断裂中段新生代右行走滑位移量为15 km左右。 相似文献