Different distribution of lacustrine facies and its controlling factors during rifting stage, ZhuⅠand Zhu Ⅲ Depressions, Pearl River Mouth Basin
-
摘要: 通过对珠江口盆地珠Ⅰ、珠Ⅲ坳陷裂陷期湖相分布特征的对比发现,2个坳陷内的湖相发育程度存在着明显差异性,即珠Ⅲ坳陷湖相发育程度明显小于珠Ⅰ坳陷。综合分析认为,产生该现象的主要原因是在裂陷期珠Ⅲ坳陷拉张程度小于珠Ⅰ坳陷,导致其不利于湖相发育。裂陷期坳陷的拉张程度受控于多种地质因素,包括应力方向、基岩岩性、区域断裂等。珠Ⅰ、珠Ⅲ坳陷在基底岩性、凹陷分布格局、基底大型隐伏断裂的影响、控凹断裂走向等方面存在着诸多差异,这些因素控制了坳陷拉张程度的差异性,也控制了湖相分布的差异性。Abstract: The distribution of lacustrine facies during rifting stage in the Zhu Ⅰ and Zhu Ⅲ Depressions of the Pearl River Mouth Basin shows that lacustrine facies spread much more widely in the Zhu Ⅰ Depression. It might be explained by the smaller extensional level of the Zhu Ⅲ Depression. The extensional level of a depression is affected by many factors, such as stress orientation, basement lithology and region faults. The differences of basement lithology, sag distribution, large potential fault below Cenozoic and sag-controlling fault orientation lead to the different extensional level of the Zhu Ⅰ and Zhu Ⅲ Depressions, and further control the different distribution of lacustrine facies.
-
Key words:
- rifting stage /
- lacustrine facies /
- potential fault /
- Zhu Ⅰ Depression /
- Zhu Ⅲ Depression /
- Pearl River Mouth Basin
点击查看大图
计量
- 文章访问数: 1103
- HTML全文浏览量: 74
- PDF下载量: 881
- 被引次数: 0