| 珠江口盆地新近纪构造特征与演化 |
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| 引用本文： | 胡阳,吴智平,何敏,王光增.珠江口盆地新近纪构造特征与演化[J].高校地质学报,2018,24(3):433. |
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| 作者姓名： | 胡阳 吴智平 何敏 王光增 |
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| 摘 要： | 在构造特征精细刻画的基础上,运用丰富的三维地震资料,通过断裂活动性的定量计算和平衡剖面分析,恢复了珠江口盆地新近纪构造演化过程,探讨了盆地动态演化的区域动力学机制。珠江口盆地新近纪经历了构造稳定期和构造活化期两大演化阶段。珠江组沉积时期,隆起区与坳陷区均整体沉降,仅坳陷内少量控盆断裂微弱活动,整体处于构造稳定阶段。进入韩江组沉积时期以来,盆地进入构造活化阶段,坳陷区表现为连续沉降,先期控盆断裂活动强度明显增强,以断块活动为特点;而东沙隆起区则经历了韩江组下段沉积时期、韩江组上段沉积时期和粤海组沉积时期三期同沉积隆升和万山组沉积时期以来的持续隆升过程,同时发育了近EW向右旋和NW向左旋共轭走滑断裂带以及一系列NWW向次级张性断裂。构造稳定阶段主要受南海扩张的影响,而构造活化阶段则是在伸展背景下发生的,可能与菲律宾海板块NW、NWW向运动导致的仰冲和弧-陆碰撞作用有关。
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| 关 键 词： | 构造演化 成因机制 新近纪 珠江口盆地 |
Neogene Tectonic Characteristics and Evolution of Pearl River Mouth Basin,South China |
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| HU Yang,WU Zhiping,HE Min,WANG Guangzeng.Neogene Tectonic Characteristics and Evolution of Pearl River Mouth Basin,South China[J].Geological Journal of China Universities,2018,24(3):433. |
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| Authors: | HU Yang WU Zhiping HE Min WANG Guangzeng |
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| Abstract: | Using abundant 3D seismic data, this paper analyzed the geometrical characteristics, and clarified the Neogene tectonic
evolution process and discussed the regional dynamics mechanism of the Pearl River Mouth Basin. Pearl River Mouth Basin underwent
tectonically stable period and tectonic activation period in the Neogene period. During the depositional period of the Zhujiang
Formation, uplift zone and depression zone were all in a regional subsidence stage, only a few basin-controlling faults in the depression
zone were still weakly active, the whole depression was in the stage of structural stability. While in the depositional period of Hanjiang
Formation, the whole basin was in the tectonic activation period, and the depression zone showed continuous subsidence, the
pre-existing basin-controlling faults became more active and are characterized by the movement of fault block. Dongsha uplift zone
experienced three syn-deposition uplifts during the early depositional period of the Hanjiang Formation, the late depositional period of
the Hanjiang Formation, and the depositional period of the Yuehai Formation. The uplift stage continued since the depositional period
of the Wanshan Formation, and the conjugate strike-slip fault system composed of a subparallel EW dextral strike-slip fault zone and a
NW sinistral strike-slip fault zone, and a series of NWW secondary tensile fractures occurred during this stage. The expansion of the
South China Sea resulted in the tectonic stability of the basin, while the Neogene tectonic activation was closely related to an
extensional setting caused by the obduction and arc-continent collision of the NW and NWW movement of the Philippine Sea Plate. |
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| Keywords: | tectonic evolution genetic mechanism Neogene Pearl River Mouth Basin |
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