TY - JOUR
T1 - Holocene sea-level change and hydro-isostasy along the west coast of Kyushu, Japan
AU - Yokoyama, Yusuke
AU - Nakada, Masao
AU - Maeda, Yasuo
AU - Nagaoka, Shinji
AU - Okuno, Jun'ichi
AU - Matsumoto, Eiji
AU - Sato, Hiroshi
AU - Matsushima, Yoshiaki
N1 - Funding Information:
valuable comments. Suggestions from P.A. Pirazzoli and A.L. Bloom were helpful to improve the paper. This work was partly supported by Ministry of Education, Science and Culture (Grand-in-Aid for Scientific Research on Priority Areas and Grand-in-Aid for Scientific Research).
PY - 1996/7
Y1 - 1996/7
N2 - Mid- to late-Holocene sea-level variations have been obtained at sites along the west coast of Kyushu, Japan. Sea-level observations for this relatively stable area are very important for evaluating the crustal tilting associated with the hydro-isostatic adjustment due to the last deglaciation, and for examining the cause of underwater Jomon sites (submerged archeological sites during the Jomon period of mid-Holocene) typically observed in this region. For these purposes, we conducted systematic boring samplings at sites from Goto Island to Tamana along the latitude of about 33°N. Then we performed diatom assemblage and pyrite-sulfur analyses of these sediment samples and 14C datings for intertidal shells in order to get the sea-level variations for these sites. Observations at Tsumizu faced to Oomura Bay with tidal range of 0.9 m show a sea-level high- stand of 1 m at about 5500 yr B.P. (years before present) followed by smoothly falling to the present level. Evidences for sea-level oscillation of greater than 50 cm have not been found here. Relative sea-levels at about 5000 yr B.P. are, however, -2 m at Goto Island (125 km west of Tsumizu) and 2 m at Tamana (50 km east of Tsumizu). Thus observations at sites along the traverse from Goto Island to Tamana are indicative of crustal tilting of about ~3- 4 m for the distance of 175 kin, which seems to be consistent with the prediction caused by the hydro-isostatic adjustment.
AB - Mid- to late-Holocene sea-level variations have been obtained at sites along the west coast of Kyushu, Japan. Sea-level observations for this relatively stable area are very important for evaluating the crustal tilting associated with the hydro-isostatic adjustment due to the last deglaciation, and for examining the cause of underwater Jomon sites (submerged archeological sites during the Jomon period of mid-Holocene) typically observed in this region. For these purposes, we conducted systematic boring samplings at sites from Goto Island to Tamana along the latitude of about 33°N. Then we performed diatom assemblage and pyrite-sulfur analyses of these sediment samples and 14C datings for intertidal shells in order to get the sea-level variations for these sites. Observations at Tsumizu faced to Oomura Bay with tidal range of 0.9 m show a sea-level high- stand of 1 m at about 5500 yr B.P. (years before present) followed by smoothly falling to the present level. Evidences for sea-level oscillation of greater than 50 cm have not been found here. Relative sea-levels at about 5000 yr B.P. are, however, -2 m at Goto Island (125 km west of Tsumizu) and 2 m at Tamana (50 km east of Tsumizu). Thus observations at sites along the traverse from Goto Island to Tamana are indicative of crustal tilting of about ~3- 4 m for the distance of 175 kin, which seems to be consistent with the prediction caused by the hydro-isostatic adjustment.
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U2 - 10.1016/0031-0182(95)00112-3
DO - 10.1016/0031-0182(95)00112-3
M3 - Article
AN - SCOPUS:0029952061
VL - 123
SP - 29
EP - 47
JO - Palaeogeography, Palaeoclimatology, Palaeoecology
JF - Palaeogeography, Palaeoclimatology, Palaeoecology
SN - 0031-0182
IS - 1-4
ER -