Opal-A/opal-CT phase boundary inferred from bottom-simulating reflectors in the southern South Korea Plateau, East Sea (Sea of Japan)
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Title
- Opal-A/opal-CT phase boundary inferred from bottom-simulating reflectors in the southern South Korea Plateau, East Sea (Sea of Japan)
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Author(s)
- Lee, GH; Kim, HJ; Jou, HT; Cho, HM
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Alternative Author(s)
- 김한준; 주형태
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Publication Year
- 2003-12
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Abstract
- 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 (78-111degreesC/km) estimated from the sub-bottom depth of the BSR are comparable to that (98degreesC/ 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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ISSN
- 0094-8276
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/5397
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DOI
- 10.1029/2003GL018670
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Bibliographic Citation
- GEOPHYSICAL RESEARCH LETTERS, v.30, no.24, 2003
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Publisher
- AMER GEOPHYSICAL UNION
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Keywords
- BSR; Opal-A/opal-CT phase boundary; South Korea Plateau
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Type
- Article
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Language
- English
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Document Type
- Article
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