Characteristics and Formation Mechanism of Structural Deformation in the Paleogene Wenchang Formation in the Panyu 4 Sag, Pearl River Estuary Basin

doi:10.19657/j.geoscience.1000-8527.2018.04.11

Abstract

Abstract:

Tectonic deformation of the Paleogene Wenchang Formation in the Panyu 4 sag of Pearl River Estua-ry Basin is intense. According to seismic interpretation, fault activity, migration characteristics of the sedimentation center and depression structural analysis, this study concluded that there was a major tectonic movement in the first stage of the Wenchang Formation. Before that, due to the NW-SE stretching, the intense NE-trending faulting may have led to the NE-trending distribution of sedimentation centers. The northern sub-region has the bipolar (E and W) faulted characteristics. The central and southern sub-regions are featured by faulting in the east and structural overlapping in the west. In the first stage of the Wenchang Formation (during which EW-trending faulting was intense) a EW-trending and a NE-trending sedimentation center were formed. The southwestern slope is featured by faulting in the north and structural overlapping in the south. In the northern sub-region, denudation of the central and southern sub-regions was likely changed from strong to weak. Difference in tectonic deformation indicated that the first stage of the Wenchang Formation was the transition period from NW-to NW-trending extension. Furthermore, the stress regime of the tectonic transform surface was the result of the convergence between the Pacific, India and Eurasian plates. This tectonic phenomenon can be found not only in the Panyu 4 sag, but also in other Cenozoic basins of east China.

Key words: Pearl River Estuary Basin, Panyu 4 sag, Wenchang Formation, structural deformation, tectonicmechanism

CLC Number:

P548
TE121.1

LIANG Jie, ZHANG Xiangtao, XU Xinming, LUO Ze, WU Jing. Characteristics and Formation Mechanism of Structural Deformation in the Paleogene Wenchang Formation in the Panyu 4 Sag, Pearl River Estuary Basin[J]. Geoscience, 2018, 32(04): 750-757.

Figures/Tables 7

Fig.1 Sketch map showing the structures and location of the Panyu 4 sag in the Pearl River Estuary Basin (the number in the figure representing the number of major faults)

Fig.2 Seismic reflection terminations of unconformities in the Wenchang Formation of the Panyu 4 sag (seeing Fig.1 for the location of profile AB)

Fig.3 Stratigraphic thickness overlapped with the ancient fault distribution of the Panyu 4 sag

Table 1 Statistics of major sedimentary-controlling faults of the Wenchang Formation in the Panyu 4 sag

断层	垂直断距/m	延伸长度/km	断层产状		断穿层位	主要活动时期
断层	垂直断距/m	延伸长度/km	走向	倾向	断穿层位	主要活动时期
F1号断层	1 740.9~4 482.5	43.10	NE	NW	T₇₀—Tg	文六段至文一段
F2号断层	62.3~1 475.8	15.86	NNE	SEE	T₈₀—Tg	文六段至文一段
F3号断层	107.8~1 261.1	10.55	NWW	SSW	T₇₀—Tg	文一段至恩平组
F4号断层	83.5~1 091.4	9.61	NWW	SSW	T₇₀—Tg	文一段至恩平组
F5号断层	206.5~2 424.7	20.05	EW	S	T₇₀—Tg	文一段至恩平组
F6号断层	156.7~858.8	10.99	EW	S	T₇₀—Tg	文一段至恩平组

Fig.4 Seismic profile of the Panyu 4 sag (seeing Fig.1 for the profile location)

Fig.5 Structural evolution profile of the Panyu 4 sag(seeing Fig.1 for the location of profile IJ)

Fig.6 3D genetic models for the Paleogene in the Panyu 4 sag

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