Incision of Submarine Channels Over Pockmark Trains in the South China Sea
Veröffentlichungsdatum
2021-12-16
Zusammenfassung
The genesis of submarine channels is often controlled by gravity flows, but channels can also be formed by oceanographic processes. Using multibeam bathymetry and two-dimensional seismic data from the western South China Sea, this study reveals how pockmarks can ultimately form channels under the effect of bottom currents and gravity-driven sedimentary processes. We demonstrate that alongslope and across-slope channels were initiated by pockmark trains on the seafloor. Discrete pockmarks were elongated due to the erosion of gravity-driven sedimentary processes and bottom currents, and later coalesced to form immature channels with irregular thalwegs. These gradually evolved into mature channels with continuous overbanks and smooth thalwegs. Submarine channel evolution was significantly influenced by seafloor topography since the Late Miocene. The evolutionary model documented here is a key to understanding how channels are formed in deep-water environments.
Schlagwörter
Bottom current
;
turbidity current
;
submarine channels
;
deep sea
;
seepage
Verlag
AGU Publications
Fachbereich
Researchdata link
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Band
48
Heft
e2021GL092861
Startseite
1
Endseite
13
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Sprache
Englisch
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Supplement_zu_Incision of Submarine Channels Over Pockmark Trains in the South China Sea.pdf
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