ANALYSIS ON SEQUENCE FORMATION STYLES OF ZHU-3 DEPRESSION IN PEARL RIVER MOUTH BASIN
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摘要: 珠江口盆地珠三坳陷是一个典型的箕状断陷盆地,其层序地层格架受到主干断裂特别是珠三南断裂的强烈控制。由于珠三南断裂活动的差异性,盆地东部、中部和西部表现为不同的格架样式。并据此划分出坳陷内的3种典型层序样式,分别是缓坡型、断控陡坡型和断阶型层序样式。文昌A凹陷与阳江低凸起过渡的斜坡区和文昌B凹陷与琼海低凸起过渡区为具有坡折的缓坡背景,发育缓坡坡折型层序样式,发育斜坡扇、盆底扇、低位楔。珠三南断裂等主干断裂下降盘发育断控陡坡带层序样式,在珠三南断裂中部地区,发育断阶型层序样式。Abstract: Zhu-3 depression in Pearl River mouth basin was a typical dustpan-like basin, its sequence formation frameworks were controlled by main faults, especially south faults of Zhu-3 depression. Because of differences in activities of south faults of Zhu-3 depression, there were different framework styles in the east, center and west of the depression. Three typical sequence formation styles were recognized in Zhu-3 depression, they were gentle slope style, steep slope style controlled by faults and fault terrace style. For it was gentle slope background in the slope belt between Wenchang-A sag and Yangjiang swell,and between Wenchang-B sag and Qionghai swell, gentle slope style was developed there, and basin floor fan, slope fan or low-stand wedge were also developed. Steep slope style controlled by faults was developed in the hanging walls of main faults such as south faults of Zhu-3 depression. And fault terrace style was developed in the center of depression.
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