Abstract
Lightness of two long(over 30 m)piston core sediment(MD179-3329 and -3304)obtained at the Umi- taka Spur off Joetsu of Japan Sea, was measured at 2 cm interval by MINOLTA SPAD 503 spectrometer. Umitaka Spur, about 900 m below sea level, is closed to Japan Alps and characterized by high sedimentation rates of about 0.4 mm/y, along with dozens of distinctive marker tephras. MD 179-3296 and -3304 sites show similarities and record Dansgaard/ Oeschger (D/O) type oscillations as the lightness change of the sediment during the late Pleistocene. The two marine cores also suggest that there are somewhat similar oscillations during Holocene. The symmetrical lightness changes of the marine cores resemble those of stalagmites record from caves in China rather than the asymmetrical changes of tem- perature proxy record from Greenland ice cores, ie rapid temperature rise and gradual decline. This implies the lightness of the marine sediments reects terrestrial sedimentux depending on the precipitation controlled by summer Asian monsoon activity. Thus, the lightness change has a potential to reconstruct paleoenvironmental changes with high resolu- tion of decennial timescale in the marginal areas of the Japan Sea with high sedimentation rates.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Japanese Association for Petroleum Technology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
