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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
The Duksung Fan Delta, Se Korea: Growth of Delta Lobes on a Gilbert-Type Topset in Response to Relative Sea-Level Rise
S. K. Chough (1), I. G. Hwang (2)
ABSTRACT
The Duksung fan delta is located on the strike-slip fault-bounded western margin of Pohang Basin (Miocene), SE Korea. The fan delta is approximately 6 km in radius and consists of alluvial fan, Gilbert-type topset, foreset, and bottomset, and basin plain. This paper concerns the Gilbert-type topset, which is characterized by stacked units (lobes) of small-scale nested foreset (less than a few meters in height) and coarsening (to fining)-upward cycles (a few meters in thickness) of conglomerate and sandstone. Each lobe prograded radially away from the sediment source with a radius of about 2 km and formed thick (> 150 m) shallow marine successions. We suggest that the relative rise in sea level was largely due to marginal normal faulting during expansion of the basin, instead of eus atic sea-level rise.
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