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Continental margin deformation analysis and reconstruction: Evolution of the East China Sea Basin and adjacent plate interaction.

机译:大陆边缘变形分析与重建:东海盆地演化及邻近板块相互作用。

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摘要

The East China Sea Basin (ECSB), located on the eastern Asian continental margin, consists of the East China Sea Shelf Basin and the Okinawa Trough Basin separated by the Taiwan-Sinzi Folded Zone. The strata of the ECSB have been deformed and the structural framework modified by multiple stages of extension and contraction since late Mesozoic times. Because of this strong deformation, past depths and positions of basins are not easily determined. Such information though, is important both to constrain regional tectonics and to understand basin evolution mechanisms.; An algorithm developed for this study is used to restore the ECSB to its original depth and position through a series of extensions and contractions. The method uses a three dimensional decompaction, backstripping, and deformation restoration approach. Stretching analysis restores basin extension or contraction, and subsidence analysis restores basin depth. Sequence depth data and basin deformation history, based on seismic interpretation, and lithologic information are required for these analyses. Seismic interpretation which combines both seismic and structural analyses of synrift and postrift sequences is used to establish and map seismic sequences, to delineate the structural framework, and to extract deformation events. The ages of the seismic sequences are controlled by data from twelve wells. Seismic facies analysis calibrated with the well logs is used to determine lithological information. The application of the basin reconstruction method in the ECSB was used for 37 different ages. This reconstruction method is a practical tool to reconstruct basin evolutionary processes and can be used in other basins for geohistory study and basin-scale reconstructions.; Results from the extension and subsidence analyses are used in regional tectonic reconstructions to analyze the origins of the strata deformation events in the ECSB. Although the eastward extrusion of Asia, caused by the India-Eurasia collision, is still considered the primary causative mechanism for other sedimentary basins in East Asia, the basin evolutionary processes in the ECSB were primarily the result of plate interactions with the western Pacific. Basin inversion forces came mainly from collisions between the Philippine Sea Plate and East Asia in mid-Oligocene and Late Pliocene times.
机译:东海盆地(ECSB)位于东亚大陆边缘,由东海陆架盆地和冲绳海槽盆地组成,被台湾-新子褶皱带隔开。自中生代晚期以来,ECSB的地层已经变形,结构框架经过了多个伸展和收缩阶段。由于这种强烈的变形,盆地的过去深度和位置很难确定。但是,这些信息对于限制区域构造和了解盆地演化机制都很重要。为此研究开发的算法用于通过一系列扩展和收缩将ECSB恢复到其原始深度和位置。该方法使用三维解压缩,反向剥离和变形恢复方法。拉伸分析可恢复盆地的伸展或收缩,沉陷分析可恢复盆地的深度。这些分析需要基于地震解释的层序深度数据和盆地变形历史以及岩性信息。地震解释结合了同步和后裂序列的地震和结构分析,可用于建立和绘制地震序列,描绘结构框架并提取变形事件。地震序列的年龄由来自十二口井的数据控制。用测井仪校准的地震相分析可用于确定岩性信息。流域重建方法在ECSB中的应用已用于37个不同的年龄。这种重建方法是重建盆地演化过程的实用工具,可用于其他盆地进行地理历史研究和盆地规模重建。扩展和沉降分析的结果用于区域构造重建中,以分析ECSB中地层变形事件的起源。尽管印度-欧亚大陆碰撞引起的亚洲向东挤压仍被认为是东亚其他沉积盆地的主要成因机制,但ECSB中的盆地演化过程主要是板块与西太平洋相互作用的结果。盆地反转力主要来自渐新世中期和上新世晚期菲律宾海床与东亚之间的碰撞。

著录项

  • 作者

    Kong, Fanchen.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Geology.; Geophysics.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 264 p.
  • 总页数 264
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地球物理学;
  • 关键词

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