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A brupt L ate H olocene uplifts of the southern I zu P eninsula, central J apan: Evidence from emerged marine sessile assemblages
Author(s) -
Kitamura Akihisa,
Koyama Masato,
Itasaka Koji,
Miyairi Yosuke,
Mori Hideki
Publication year - 2014
Publication title -
island arc
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.554
H-Index - 58
eISSN - 1440-1738
pISSN - 1038-4871
DOI - 10.1111/iar.12059
Subject(s) - stereochemistry , geology , chemistry
Evidence for abrupt coastal uplifts has been found in emerged sessile assemblages in a sea cave at the southern end of the I zu P eninsula, central J apan. We identified five sessile assemblage zones: Z ones I to V , in ascending order. The uppermost zone ( Z one I ), located at an elevation of 2.7–3.5 m above the present‐day mean sea level (amsl), is a hard massive shellcrust consisting mainly of the barnacles C hthamalus challenger and the tube worm P omatoleios kraussii. Z one II , at 2.35–2.7 m amsl, is dominated by well‐preserved individuals of C . challenger . Z one III , at 2.0–2.35 m amsl, is strongly eroded and consists mainly of C . challenger and P . kraussii . Z one IV , at 1.6–2.0 m amsl, is characterized by the co‐occurrence of very fresh shells of C . challenger and P . kraussii . Z one V (the lowest zone), at 1.0–1.60 m amsl, is characterized by the co‐occurrence of very fresh shells of S accostrea kegaki and P . kraussii , and by the absence of C . challenger . Radiocarbon dating by accelerator mass spectrometry ( AMS ) and the presence of modern taxa in the sessile assemblages suggest that three episodes of coastal uplift have occurred in the area, during AD 570–820, AD 1000–1270, and AD 1430–1660, with magnitudes of 0.9–2.0 m, 0.3–0.8 m, and 1.9–2.2 m, respectively.