Synthetic coral-reef terraces and variations of Quaternary sea level

Details Synthetic coral-reef terraces and variations of Quaternary sea level Synthetic coral-reef terraces and variations of Quaternary sea level

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..70..121t&link_type=abstract

Earth and Planetary Science Letters, Volume 70, Issue 1, p. 121-128.

Computer Science

1

Scientific paper

Coral-reef terraces on tectonically elevated coasts provide important data on variations of sea level. In this paper a systematic approach is presented for the construction of synthetic reef terraces. Idealized reef terraces are generated assuming a constant rate of tectonic uplift ν and a harmonic variation of sea level with amplitude hwo and period τ. It is further assumed that coral terraces grow only during periods of relative sea-level rise. The behavior is governed by the parameter u = υτ/2π hwo. If u > 1 no reef terraces form. If 0.217 < u < 1 a discontinuous series of terraces form on the uplifting basement. If 0 < u < 0.217 the basement is covered with coral and a series of coral terraces forms on this coral. Uplifted coral-reef terraces on the Huon Peninsula, Papua New Guinea, compare reasonably well with terraces generated by our model with τ = 20,000 years and hwo = 21.4 m. We also compare the observed terraces with model terraces using the paleo sea level inferred from 18O/16O data. The observed terraces are qualitatively similar to those predicted using the oxygen isotope data, however, the model terraces require larger relative sea-level variations with a near 20,000 year period than those inferred directly from the 18O/16O data.

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