Radiocarbon Ages of Beach Rocks and Late Holocene Sea-Level Changes in the Southern Part of the Nansei Islands, Southwest of Japan
Issue Date
2001-01-01Keywords
beachrockRyukyu Islands
sea level changes
isotope ratios
Holocene
upper Holocene
Far East
Japan
paleoclimatology
AsiaCenozoicQuaternaryC 14carbondatesisotopesradioactive isotopesC 13 C 12stable isotopesabsolute agesedimentary rockscarbonate rocks
Metadata
Show full item recordCitation
Omoto, K. (2001). Radiocarbon ages of beach rocks and Late Holocene sea-level changes in the southern part of the Nansei Islands, southwest of Japan. Radiocarbon, 43(2B), 887-898.Journal
RadiocarbonDescription
From the 17th International Radiocarbon Conference held in Jerusalem, Israel, June 18-23, 2000.Additional Links
http://radiocarbon.webhost.uits.arizona.edu/Abstract
Beach rock is a good indicator of the past sea levels, as it is considered to have been formed within the range of intertidal zone. Radiocarbon dates of beach rocks collected from Iriomote Island, Ishigaki Island, and Miyako Island, in the southern part of the Nansei Islands, indicate that the beach rocks were formed between around 4000 BP and 400 BP. Late Holocene sea-level changes were revealed based on the elevations and 14C dates of the beach rocks. The results indicate that the sea level was similar to the present one for at least the past 4000 BP. Isotopic fractionations (delta-13C) of the beach rocks were between +9.4 per mil and -0.8 per mil, suggesting a different origin for calcium carbonate.Type
Proceedingstext