Citation: | NIE Xin, LUO Weidong, ZHOU Jiao. DEPOSITIONAL CHARACTERISTICS OF THE PENGHU SUBMARINE CANYON IN THE NORTHEASTERN SOUTH CHINA SEA[J]. Marine Geology Frontiers, 2017, 33(8): 18-23. doi: 10.16028/j.1009-2722.2017.08003 |
Submarine canyons, a kind of elongated, narrow and deep negative reliefs, are common at active or passive continental margins. The Penghu submarine canyons are characterized by large slope and complex landform. High resolution single-channel 2-D seismic data are used in this paper to identify submarine canyons. Data shows that the canyons are generally in" V" shape or" U" shape, or "U" shape with a wide bottom in seismic profiles. Strong erosional features are commonly observed in the upper reaches of the canyons. There secondary grooves and slope gullies without sediment infilling are quite common. The formation of the Penghu submarine canyons is related to the sea level change during the late Quaternary. In the low water stage, the shelf was widely exposed to air and deposition occurred only in the area out of the shelf or even on the upper slope. Active gravity flow contributed to the formation of the submarine canyons.
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Tectonic unit of study area
Topographic map of Penghu submarine canyons
Seismic reflection characters of each seismic reflecting interface(seismic section a in Fig. 1)
Typical seismic profiles show the morphological characters of canyon section
Lateral variation of the Penghu submarine canyons and channels(seismic section b、c、d、e in Fig. 1)
Single-channel seismic profile shows the sediment waves(seismic section h in Fig. 1)
Seismic profile shows collapse in the Penghu submarine canyons
Seismic reflection characters of landslide zone(seismic section g in Fig. 1)