Stratal patterns in the southwestern margin of the Ulleung Basin off southeast Korea: sequence architecture controlled by back-arc tectonism |
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| Authors: | S K Chough S H Yoon S J Park |
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| Institution: | (1) Department of Oceanography, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea, KR;(2) Department of Oceanography, College of Ocean Sciences, Cheju National University, Cheju 690-756, Korea, KR;(3) Korea Petroleum Development Corporation, Anyang, 431-711, Korea, KR |
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| Abstract: | Major variations in type and rate of tectonic movement in the southwestern margin of the Ulleung Basin coincide in time with
changes in stratal patterns at succession boundaries, suggesting that the effect of tectonism was dominant for the development
of sequence architecture. During the back-arc opening (16–12 Ma), the rise of relative sea level and the high rate of sediment
supply gave rise to sequences with sigmoid progradational patterns. During the back-arc closing (12–6.5 Ma), fall- and rise-dominated
relative sea-level fluctuations resulted in sequences with varying stratal patterns depending upon changes in deposition rate.
The rise-dominated relative sea level has been prevalent during the later stage (6.5 Ma–Present) with low sedimentation rate.
Received: 16 January 1996 / Revision received: 7 February 1997 |
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