Complex Linkage and Transformation of Boundary Faults of Northern Huizhou Sag in Pearl River Mouth Basin
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摘要: 边界断裂控制断陷盆地的形成和构造格局,不同边界断裂联接模式对不同类型盆地演化具有差异性.基于井控高精度3D地震资料,通过对边界断裂几何学特征描述和“四级小层”刻画,结合裂陷Ⅰ幕边界断裂不同区段的活动差异性以及与沉积中心迁移的空间匹配关系,剖析珠江口盆地惠州凹陷北部边界断裂的形成和演化.惠州凹陷北部边界断裂始新世早期分段孤立发育,逐渐以纵向和横向双向联接的模式发展.纵向联接为断层软联接和硬联接复合联接和转换,形成转换斜坡和横向背斜,控制凹(洼)陷的结构与演化,制约沉积中心及层序的迁移.横向联接表现为转换斜坡内横向断层的多阶段联接,联接过程可划分为孤立正断层、同向叠置及硬联接3个阶段,控制转换斜坡带内沉积体系的发育和展布.研究给出了一个裂陷盆地边界断裂时空演化、复合联接和转换模式的独特案例,对丰富裂陷盆地边界断裂及其与沉积层序、凹陷演化和区域动力学机制的响应关系的研究具有积极的意义和价值.Abstract: The formation and tectonic framework of a faulted basin are controlled by boundary fault, which have different types of basin evolution under different boundary connection modes. The purpose of this study is to recognize the linkage model of boundary faults of northern Huizhou sag in Zhu Ⅰ depression, Pearl River Mouth basin (PRMB), the South China Sea, which is a representative of global passive continental margin basins. Based on well controlling high-precision 3D seismic survey, the geometry of boundary faults and the framework of "four-order sequences" are determined in PRMB. The fault activities of different boundary fault sections and the spatial change of depocenters during rift episode Ⅰ are analyzed. An evolution model of boundary fault system in northern Huizhou sag, PRMB is established in this study. The results show that the northern bounding faults of northern Huizhou sag have an offset geometry in Early Eocene, characterized by along-strike and transverse two-way linkage. The along-strike linkage is a composite connection-transformation of "soft and hard" linkage, forming a relay ramp and transverse folds which restrict the structural evolution within Huizhou sag and the migration of its depocenters and sequences. The transverse linkage means the multiple-stage linkage of the transfer faults in relay ramp, including three stages, namely, isolated normal faulting, synthetic overlapping and hard linkage, which control the migration and distribution of depositional system within the relay ramp. This paper presents a unique case of spatial evolution, complex linkage and transformation model of boundary faults in a rift basin, which can facilitate further studies on the response relationship among the boundary fault, sedimentary sequence, sag evolution and regional dynamics mechanism.
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Key words:
- fault linkage /
- fault transformation /
- boundary fault /
- Huizhou sag /
- Pearl River Mouth basin /
- tectonics
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图 3 不同洼陷的结构样式
剖面AA′.HZ10洼;剖面BB′.HZ09洼;剖面CC′.HZ08洼和HZ14洼.测线位置依次见图 2
Fig. 3. Structural styles of different depressions
图 8 洼陷层序迁移演化剖面
测线位置见图 2中的FF′
Fig. 8. The cross-section showing the sequence migration and evolution of depression in Huibei
图 11 "四级小层"迁移反应横向断层发育次序
测线位置见图 2,HH′
Fig. 11. The migration of "Fourth layer" reflecting the order of transfer faults development
图 12 边界断裂陡坡带及分段断层联接部位主要地震相类型
测线位置见图 13,II′和JJ′
Fig. 12. The main seismic facies types of steep slope zones and segment fault linkage part of border fault
表 1 不同裂陷盆地边界断裂模式
Table 1. Border fault patterns under different rift basin types
盆地类型 边界模式 实例 相关文献 陆内裂陷盆地(大陆裂谷) 软联接为主(转换带) 东非裂谷系
莱茵地堑系
贝加尔裂谷Morley et al., 1990
Younes and McClay, 2002
Hus et al., 2006陆间裂陷盆地 硬联接为主(横向褶皱) 红海-亚丁湾
苏伊士湾Jackson et al., 1988
McClay et al., 1998
Chris et al., 2002
Bosworth et al., 2005被动大陆边缘盆地 复合联接(转换斜坡和横向褶皱并存) 大西洋两侧的大陆边缘
南海北部陆坡Shelton, 1984
Bally, 1981表 2 横向断层几何要素统计
Table 2. Statistic of geometry elements for transfer faults
断层名称 断开层位 文昌组 延伸长度(km) 走向(°) 倾角(°) 最大断距(km) F10-1 Tg-T80 2.4 SEE116.2 40~50 1.105 F10-2 Tg-T80 3.1 SEE135.1 70 1.489 F10-3 Tg-T80 1.8 SEE106.7 35~50 0.671 F13-1 Tg-T80 3.5 NW48.1 30~40 1.624 F13-2 Tg-T80 6.9 NW59.7 40~50 1.464 F13-3 Tg-T80 2.6 NW54.5 30~40 1.182 -
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