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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Research, Section B: Stratigraphy and Global Studies
Vol. 70 (2000), No. 2. (March), Pages 296-309

High-Resolution Seismic Study as a Tool for Sequence Stratigraphic Evidence of High-Frequency Previous HitSeaNext Hit-Previous HitLevelNext Hit Changes: Latest Pleistocene-Holocene Example from the Korea Strait

Dong-Geun Yoo (1), Soo-Chul Park (2)

ABSTRACT

Sequence stratigraphic analysis of high-resolution seismic reflection profiles and sediment data reveals that the latest Pleistocene-Holocene deposits in the Korea Strait shelf off the southeastern Korean Peninsula form a high-frequency sequence consisting of a set of lowstand, transgressive, and highstand Previous HitsystemsNext Hit Previous HittractsNext Hit that corresponds to a fifth-order (20 kyr) Previous HitseaNext Hit-Previous HitlevelNext Hit Previous HitcycleNext Hit. Eight depositional Previous HitsystemsNext Hit, each with different seismic facies, constitute the Previous HitsystemsNext Hit Previous HittractsNext Hit. The lowstand Previous HitsystemsNext Hit tract, consisting of sandy mud, forms a deltaic wedge that pinches out updip near or at the relict shelf edge. The transgressive Previous HitsystemsNext Hit tract, consisting mainly of sands, includes six depositional Previous HitsystemsNext Hit: (1) inner-shelf transgressive layer, (2) transgressive estuarine-deltaic complex, (3) transgressive sand ridge, (4) mid-shelf transgressive layer, (5) incised-channel fill, and (6) beach-shoreface complex. Although the transgressive Previous HitsystemsNext Hit tract is widely distributed, it is much thinner than the lowstand and highstand Previous HitsystemsNext Hit Previous HittractsNext Hit. The highstand Previous HitsystemsNext Hit tract is composed of a prodelta-shelf complex consisting almost exclusively of Holocene muds.

The distribution and geometry of the Previous HitsystemsNext Hit Previous HittractsNext Hit in the latest Pleistocene-Holocene sequence in the Korea Strait shelf is different from that of Vail's model in that: (1) the lowstand Previous HitsystemsNext Hit tract consists only of the lowstand deltaic wedge, which forms an elongated sediment body along the paleoshelf edge, and (2) the highstand Previous HitsystemsNext Hit tract is completely confined to the inner shelf and forms a nearshore belt parallel to the coastline. High-frequency (sim.jpg20 kyr), high-amplitude (magnitude of about 130 m) Previous HitseaNext Hit-Previous HitlevelTop change, together with strong currents flowing northeastward along the southeastern coast of the Korean Peninsula and varying sediment supply, have resulted in this rather unusual stratigraphic architecture.


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