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近年来裂谷盆地研究的一个重要进展就是认识到了裂谷过程的多幕性。通过对裂陷期内的区域性角度不整合、超覆、地层大量缺失以及三级层序空间展布的旋回性分析,论证了珠江口盆地惠州凹陷古近纪是典型的幕式裂陷,其具有“两幕裂陷构造格架未发生变化”的独特特征。在此基础上,对惠州古近纪幕式裂陷的特点及其动力学含义进行了分析。研究表明:惠州凹陷古近纪具有典型的幕式裂陷特征;构造格局未发生变化的幕式裂陷可能反映了板块及深部动力学作用的幕式性;推测与裂谷盆地相关的岩石圈均衡调整可能为幕式的非均质伸展过程。
In recent years, an important advance in the study of rift basins has been to recognize the multi-curtain nature of the rifting process. Through the analysis of regional angle unconformity, overrun, massive stratigraphy and the cyclic analysis of tertiary spatial distribution in the rifting period, it is demonstrated that the Paleogene in the Huizhou Sag of the Pearl River Mouth Basin is a typical episodic rift. It has the unique feature that the tectonic framework of rifts in the two scenes has not changed. On this basis, this paper analyzes the characteristics and dynamic meaning of the ancient curtain rupture in Huizhou. The results show that the Paleogene in Huizhou sag has the characteristic of episodic rifting. The episodic rift that tectonic structure did not change may reflect the episodic nature of plate and deep dynamics. It is speculated that the lithosphere associated with rift basin Equilibrium adjustment may be a non-homogeneous stretch of the curtain.