Opal-A/opal-CT phase boundary inferred from bottom-simulating reflectors in the southern South Korea Plateau, East Sea (Sea of Japan)

Details Opal-A/opal-CT phase boundary inferred from bottom-simulating reflectors in the southern South Korea Plateau, East Sea (Sea of Japan) Opal-A/opal-CT phase boundary inferred from bottom-simulating reflectors in the southern South Korea Plateau, East Sea (Sea of Japan)

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30xsde3l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 24, pp. SDE 3-1, CiteID 2238, DOI 10.1029/2003GL018670

Physics

Geophysics

Exploration Geophysics: Seismic Methods (3025), Marine Geology And Geophysics: Marine Seismics (0935), Oceanography: General: Marginal And Semienclosed Seas

Scientific paper

Multi-channel seismic reflection profiles from the trough areas of the southern South Korea Plateau, East Sea (Sea of Japan), reveal high-amplitude, positive-polarity bottom-simulating reflectors (BSRs) at about 500 ms two-way travel time (ca. 450 m) below the seafloor. The positive polarity and no noticeable drop of frequency (low-frequency shadow) below the BSR strongly suggest that the BSR is due to an opal-A/opal-CT phase boundary. The BSR often marks a sharp interface between low-amplitude reflections above and high-amplitude reflections below. The weak, but distinct reverse-polarity event, seen 70-150 ms two-way travel time below the BSR, may represent the base of the silica diagenetic zone. The geothermal gradients (78-111°C/km) estimated from the sub-bottom depth of the BSR are comparable to that (98°C/km) measured at the nearby Kita-Yamato Trough, where the opal-A/opal-CT boundary has been penetrated by the Ocean Drilling Program (ODP) drilling.

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