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To better understand the crustal deformation of the South China Sea Basin, we produce a mechanically consistent 2-dimensional model for observing regional velocity field in the South China Sea (SCS). We studied the dominating regional tectonic stress field by geodetic measurements and finite element analysis, the spatial variations of velocity field and strain field, and relative movements among different blocks, using a 2-dimensional model describing crustal deformation of the South China Sea Basin. Strain results show that the SCS is extending at present. The western part of SCS is opening gradually in NWSE direction from its northern margin to the south, but the eastern part of SCS is opening gradually from its central part to the north and south. In addition, we analyzed the plate kinematics to the deformation of the SCS, using a two-dimensional finite element model. Our simulations results are well explained by available geodetic data. The movement of SCS is resulted from interactions among Indian Plate, Pacific Plate, Philippine Sea Plate, and Eurasian Plate. 相似文献
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采用重力异常数据,在频率域内通过Parker-Oldenburg反演算法计算南海及邻区的莫霍面深度。通过EGM2008重力场模型联合GOCE重力场模型,计算研究区的自由空气重力异常;通过重力场分离,得到莫霍面起伏引起的重力异常,用于反演莫霍面深度。计算结果与地震剖面计算的莫霍面深度结果平均偏差1.59 km,标准偏差1.9 km。结果表明,南海及邻区的莫霍面深度分布具有明显的区域化构造特征。 相似文献
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山东半岛海域成矿区带划分以往研究程度较低。该文利用海域重磁资料,在研究区梳理了渤海和黄海的重磁异常特征,渤海和北黄海呈负布格重力异常,南黄海北部与之相反;渤海为正磁异常,黄海与之相反。以重磁异常为基础,基于陆域构造单元划分,对海域构造单元划分至Ⅲ级10个构造单元,海域构造单元多为陆域向海域的延伸,仅渤中坳陷和北黄海盆地为独立的海域构造单元。参照陆域成矿区带划分,以构造单元边界为界线,海域成矿区带划分至Ⅳ级6个成矿区,各成矿区特征不同,坳陷构造单元内成矿区富集油气矿产,隆起构造单元内成矿区表现为埕宁隆起富集煤矿,胶北隆起富集金、菱镁矿、煤、灰岩矿,千里隆起富集岩金、蛇纹岩、石棉、花岗石矿。 相似文献
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孤店断陷为松辽盆地南部深层天然气勘探的有利区带,同时也记录了中国东部中-新生代板块运动和盆地演化的丰富信息。利用钻测井资料及高分辨率三维地震资料,并结合区域构造背景,对孤店断陷的地质结构及构造演化特征进行分析。结果表明孤店断陷在纵向上可以划分为基底构造层、下构造层、中构造层及上构造层。由于受到晚中生代以来太平洋板块向东亚板块的俯冲作用及区域构造应力场的影响,孤店断陷的构造演化过程可以划分为断陷期、断坳转换期、稳定坳陷期及构造反转期。孤店断陷的边界大断层(孤店断层)在断陷初始发育期(火石岭组-沙河子沉积期)表现为6段走向各不相同的小型孤立断层,在断陷晚期(营城组沉积期)经过生长、连接而形成统一的断陷边界,并在断坳转换期(登娄库组-泉头组沉积期)和坳陷期(青山口组-嫩江组沉积期)发生广泛而强烈的张扭活动,以及在构造反转期(嫩江组沉积末期)发生强烈反转和分段差异逆冲活动。研究结果可以为松辽盆地以及中国东部地区的构造活动及演化研究提供参考,并进一步指导油气勘探。 相似文献
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通过礼乐盆地构造-地层-沉积分析，查明了其构造演化及沉积充填特征，揭示了其与南海扩张事件的成因联系，为南海边缘海演化研究提供了参考。研究结果表明:礼乐盆地新生代构造-沉积演化经历了3个差异显著的阶段，即古新世-早渐新世陆缘裂陷-滨浅海碎屑岩沉积阶段、晚渐新世-早中新世裂离漂移-浅海碳酸盐岩沉积阶段、中中新世以来周缘前陆挠曲沉降-区域差异沉积阶段。古新世-早渐新世，古南海向东南俯冲，华南古陆陆缘因水平引张力作用发生被动裂陷，形成礼乐盆地；此时以滨浅海环境为主，受碎屑物源供给控制，在盆地西北部发育一系列规模相对较大的辫状河三角洲，礼乐盆地东部、南部邻近古南海，仅在孤立隆起边缘发育规模较小的扇三角洲。晚渐新世-早中新世，古南海持续俯冲，新南海扩张，礼乐-巴拉望地块裂离华南古陆，向南漂移，盆地沉降缓慢，断层活动弱；此时以浅海-半深海环境为主，碎屑物源匮乏，盆地北部发育大型碳酸盐岩台地和生物礁，南部总体为半深海环境。中中新世以来，新南海扩张停止，礼乐-巴拉望地块向菲律宾岛弧俯冲碰撞，礼乐盆地进入周缘前陆期，以非对称挠曲沉降为特点，水深增大，断层活动增强；此时以半深海-浅海为主，盆地北部总体以碳酸盐岩台地和生物礁为特色，盆地南部局部发育深水重力流沉积。礼乐盆地构造-沉积演化与古南海俯冲-消亡、新南海扩张-关闭过程密切相关。 相似文献
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Andrea Silverman SUN Jilin 《中国海洋大学学报(英文版)》2005,4(4):366-376
The interdecadal factors affecting the summer monsoon winds over Somalia and the South China Sea were studied. Global geopotential heights and wind velocity fields of the 850-hPa and 200-hPa pressure levels, as well as sea surface temperature anomaly data and correlation coefficients were analyzed. The monsoons over Somalia and the South China Sea were found to be two different monsoon systems, operating on different mechanisms and being affected by different ocean-atmosphere interactions. The intensity of the Asian subtropical summer monsoon is influenced by the intensity of the summer monsoon over Somalia in the month of June and by the intensity of the summer monsoon over the South China Sea in the months of June and July. The summer monsoon wind strength over Somalia is affected by regional factors, such as the heating of the Tibetan plateau, and by global mechanisms, such as the subtropical heat exchange with Antarctica. The summer monsoon over the South China Sea is affected by different ocean-atmosphere interactions. The Somalia and subtropical summer monsoons have wind blowing down the pressure gradient from area over ocean to that over land, like typical summer monsoons. The South China Sea summer monsoon has winds that blow down the pressure gradient from area over land to that over ocean. The South China Sea summer monsoon is affected by the Kuroshio Current off the east coast of Japan. 相似文献
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INTRODUCTION~hon0ffornjcelmtSwnthebasisofthestudyonthecrustaldefonnationanddeVel0prnent,thedistributionofndnereIs,andthendnerogeneticlawr.ThegeornagneticfieklisthecomP0siterefledionoftheformati0nanddefortnationofthecrust.Sornagnct-icsLLrVeydatacomPriseirnPortantbasisfordelincatingthearchiteCtonicelements,dCtendningtheirboundarylines,andanalopngthesanndarystrudriineachelernent,whicharetthernaintasks0fgoophySicalworkers.Thegoornagneticdelineati0nofanareahadforlongbodonequalitativeybyobs… 相似文献
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从分散在世界各地、浩如烟海的历史地图中选取出符合"中国东海、南海及周边国家历史地图资料整编"要求的历史地图,把它们按照一定的规则组织管理起来,是非常有意义和价值的。首先要确定这些历史地图的管理者,管理者所记录的地图资料信息,还要分析这些信息的可用性。利用地理信息系统技术来提取历史地图信息的空间位置,以辅助快速搜寻到符合专项要求的历史地图。根据项目需求确定历史地图元数据的设计原则及历史地图元数据项,建立元数据录入管理系统,快速录入符合要求的元数据以提高历史地图数据库的建设效率。 相似文献
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Offshore Fault Geometrics in the Pearl River Estuary,Southeastern China: Evidence from Seismic Reflection Data 总被引：1，自引：0，他引：1
Jinghe Cao Shaohong Xia Jinlong Sun Fang Zhao Kuiyuan Wan Huilong Xu 《中国海洋大学学报(英文版)》2018,17(4):799-810
The Pearl River Estuary (PRE) is located at the onshore-offshore transition zone between South China and South China Sea Basin, and it is of great significant value in discussing tectonic relationships between South China block and South China Sea block and seismic activities along the offshore active faults in PRE. However, the researches on geometric characteristics of offshore faults in this area are extremely lacking. To investigate the offshore fault distribution and their geometric features in the PRE in greater detail, we acquired thirteen seismic reflection profiles in 2015. Combining the analysis of the seismic reflection and free-air gravity anomaly data, this paper revealed the location, continuity, and geometry of the littoral fault zone and other offshore faults in PRE. The littoral fault zone is composed of the major Dangan Islands fault and several parallel, high-angle, normal faults, which mainly trend northeast to northeast-to-east and dip to the southeast with large displacements. The fault zone is divided into three different segments by the northwest-trending faults. Moreover, the basement depth around Dangan Islands is very shallow, while it suddenly increases along the islands westward and southward. These has resulted in the islands and neighboring areas becoming the places where the stress accumulates easily. The seismogenic pattern of this area is closely related to the comprehensive effect of intersecting faults together with the low velocity layer. 相似文献
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【目的】研究海南岛大地构造在中-新生代的隆升剥露过程与热演化史,为华南地块的构造演化提供有力证据。【方法】利用磷灰石裂变径迹(AFT)、磷灰石及锆石(U-Th)/He等构造热年代学研究方法,重建海南岛北部岩体的构造-热演化历史,分析侵入岩体在不同构造热演化阶段的冷却剥蚀速率,并进一步探讨岩体隆升过程的动力学过程。【结果】AFT年龄介于(33.3±2.5)~(45.0±3.5)Ma之间,磷灰石平均长度为(12.68±0.28)~(13.04±0.9)μm;磷灰石(U-Th)/He(AHe)单颗粒年龄(36.3±2.2)~(60.2±3.7)Ma,锆石(U-Th)/He(ZHe)单颗粒年龄为(79.5±4.9)~(98.4±6.1)Ma及(37.1±2.3)~(59.6±3.7)Ma。联合反演热史揭示,研究区岩体自晚白垩世(约100 Ma)以来的冷却过程有明显的差异性,可分为4个阶段:1)约100~45 Ma相对缓慢冷却阶段;2)约45~35 Ma快速冷却剥蚀阶段;3)约30~35 Ma至10 Ma缓慢冷却过程;4)约10 Ma以来再次快速冷却剥露。【结论】海南岛北部花岗岩体阶段性抬升冷却与(古)太平洋板块的俯冲后撤、西南部印度-欧亚大陆碰撞和中新世晚期菲律宾海板块向西俯冲挤压有关。海南岛北部在Ⅰ、Ⅱ期(始新世晚期)剥蚀阶段基本造成总剥蚀量的2/3。 相似文献
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为了明确南海西南次海盆V型尖端地壳岩石圈发生最终裂解的特征及其演化过程,通过精细的构造解释、断层活动性定量分析、不同构造演化阶段盆地原型分析、沉降速率分析、沉降史模拟等方法综合分析表明,南海西南次海盆V型尖端临界破裂区为远端带和洋陆转换带构成的地壳岩石圈强烈伸展区,依据地壳岩石圈几何形态,该区域可进一步划分为箱型域和楔型域。楔型域内盆地原型可划分为断陷盆地（Tb-SD）、拆离盆地（SD-PD）和拗陷盆地（PD-Bi）;箱型域在古新世-渐新世（Tb-SD）盆地原型为断陷盆地,之后该区域进入被动沉降期。新生代以来,南海西南次海盆V型尖端在构造演化过程中,盆地沉降中心由陆向洋方向逐渐迁移,岩浆作用在断拗转换幕发育最强烈,致使岩石圈地壳最终发生裂解。区域资料对比分析表明,南海西南次海盆V型尖端在不同构造带内,盆地构造-地层格架具有差异性,且南海西南次海盆V型尖端经历"双拆离作用"后地壳发生破裂,岩浆侵入,形成原洋洋壳。该认识对南海西南部深水盆地内油气勘探具有重大指示意义。 相似文献
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四川"9.3"大暴雨中的水汽输送分析 总被引：4，自引：0，他引：4
利用NCEP／NCAR再分析资料对四川“9．3”大暴雨中水汽来源进行了讨论。结果表明,这次暴雨的水汽主要来源于南海、西太平洋地区;异常水汽输送在这次暴雨中占了较大的比例。暴雨日及前3天的异常水汽输送表明,造成此次川东暴雨的异常水汽来源于西太平洋经南海、东海、黄海的向北水汽输送和暴雨区北方的向南水汽输送,以及青藏高原的异常偏西风输送,孟加拉湾的水汽输送对异常强降水并没有明显的作用。大暴雨发生的前期,副高突然异常加强西伸。 相似文献
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中国海域1:100万地质地球物理系列图包括布格重力异常图、空间重力异常图、磁力异常图、表层沉积物分布图和区域构造图5种图件.利用数字化编图技术对新旧资料进行同化处理和标准化处理,在编图的过程中,采取多种技术手段确保编图质量,并进行了GIS数据库的构建工作.地理底图和各专题图件均在MapGIS基础平台上以点、线、面三种图元类型表示,根据实际材料和图面内容进行分层设计、分层构建、统一成图的技术路线,为日后资料使用和图件修编奠定了良好基础.以MapGIS为平台,可以很好地完成地质地球物理系列编图任务. 相似文献
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The pre-Eocene history of the region around the present South China Sea is not well known. New multi-channel seismic profiles provide valuable insights into the probable Mesozoic history of this region. Detailed structural and stratigraphic interpretations of the multi-channel seismic profiles, calibrated with relevant drilling and dredging data, show major Mesozoic structural features. A structural restoration was done to remove the Cenozoic tectonic influence and calculate the Mesozoic tectonic compression ratios. The results indicate that two groups of compressive stress with diametrically opposite orientations, S(S)E– N(N)W and N(N)W–S(S)E, were active during the Mesozoic. The compression ratio values gradually decrease from north to south and from west to east in each stress orientation. The phenomena may be related to the opening of the proto-South China Sea(then located in south of the Nansha block) and the rate at which the Nansha block drifted northward in the late Jurassic to late Cretaceous. The Nansha block drifted northward until it collided and sutured with the southern China margin. The opening of the present South China Sea may be related to this suture zone, which was a tectonic zone of weakness. 相似文献
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1∶500万中国海陆地质-地球物理系列图编图范围广,包括中国陆地及所辖海域以及周边陆地和海域,共涉及8种地质、地球物理专业图.本文介绍了建立本次编图的数学基础即地图投影的过程,讨论了确定系列图投影方式及参数的原则和方法,选择墨卡托和兰伯特等角割圆锥两种常用的保角投影方式做试验,比较了在这两种投影之下系列图范围内编图重点... 相似文献
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Dongsha Island and the adjacent sea area locate at the northern continental margin of the South China Sea (SCS), and is connected to the east by the Manila Trench. Analyses of seismic stratigraphy and gravity, magnetic and drilling wells data led to the discovery of three post-fault sequences (Ⅴ, Ⅵ, Ⅶ). Extensive tectonic uplift, magma activity and erosion occurred in Dongsha Island and the adjacent area, where most of the faults in the northeastern SCS were still active during Pliocene and Quaternary. Two groups of faults trending NEE and NW were developed during Late Cenozoic. We conclude that three important tectonic movements, especially Dongsha movement(4.4 - 5.2 Ma) and Liuhua movement (1.4 - 1.89 Ma), controlled the structural framework in the Dongsha rise; whose deformation in the east is stronger than that in the west and whose stress field variation suggests that the tectonic uplift in the study area contributed to magmato-tectonic events correlated to the main collision phases between the East China and Taiwan 5 - 3 and 3 - 0 Ma ago. 相似文献
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基于海表面温度数据和海面高度异常数据,采用矢量几何法提取南海的中尺度涡旋并进行统计分析。结果显示,从海表面温度和海面高度异常数据都可以提取涡旋,两者的提取能力差异很小。由海表面温度数据可以提取较小尺度的涡旋,但跟踪涡旋时存在不稳定性;由海面高度异常数据虽然不能检测到较小尺度的涡旋,但跟踪涡旋相对稳定。两种数据所提取涡旋的时间和空间分布规律具有一致性。 相似文献
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南海区域商船典型空间分布及贸易流向研究 总被引：1，自引：0，他引：1
随着中国对外开放的深入以及“一带一路”倡议的推进,南海战略地位更加显著。如何科学监管南海船舶,维护国家权益,促进地区之间贸易也成为摆在政府部门面前的难题。在本文中利用南海区域2015年的卫星AIS数据与船舶数据档案资料,通过计算南海水域船舶交通密度分析主要航路,与关键门线船舶流量计算相结合,明确船舶典型空间分布;同时基于4种类型船舶的主要航路的选择,明确南海货物贸易主要流向。研究成果表明：① 船舶空间分布在《世界大洋航路》的推荐航线上,南海的建设开发并未影响船舶的贸易运输;② 贸易运输以跨越南海的长距离运输为主,珠三角作为主要航路的重要端点表明中国在南海贸易的优势地位。 相似文献
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Synthetical analyzing the deep geophysical data within Bohai bay basin the authors detect the deep crustal structure presenting high geothermal flux, thinned crust and arched Moho discontinuity, and the basin basement belongs to rigid continental crust. The development of the basin was controlled by two - dimensional faults in NNE and NWW directions. The tectonic units of the basin can be subdivided into three structural divisions: the east, middle and west division. The basin is considered as a continental rift. The tectonic background and regional right - lateral stress field during the late Cretaceous and Paleogene were a compound result of the Kula Plate W - directional subducting under Eurasia Continental Plate in 80 ～ 74Ma and the Philippine sea Plate W -directional subducting under the Eurasia Continental Plate since 60Ma, the long-rang effect of the India Continental Plate wedging into the Eurasia Continental Plate and of the Siberia Plate SE - directional relatively moving. 相似文献