Deep Sea Fan Depositional Systems
Deep Sea Fans form in the moderate to deep ocean, down-dip of submarine canyons and, often, deltas.
They have large sediment flux, high sedimentation rate and, usually, large areas.
Gravity is the dominant flow transport and deposition mechanism.
Lobes and lobe-switching are important.
Both coarse and fine grained sediment are present.
Sand-bodies are often well-sorted and normally graded.
Characteristics of Deepwater Systems
Sediments fine upward from marine fans.
Sand bodies form lobes perpendicular to basin margin.
Formed by a mix of fluvial input, and turbidite currents.
Facies: Sub-divided erosion surfaces formed during:
Poor to well-sorted litharenites are common.
Fauna & flora – Restricted Marine fauna, often in over-bank shales