HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Research Units >
21st Century COE Program, Neo-Science of Natural History - Origin and Evolution of Natural Diversity >
Origin and Evolution of Natural Diversity >
Proceedings >

Experimental Study of the Use of the Stable Isotopic Composition of Calcareous Microfossils in Shallow Marine Sediments for Reconstructing Paleoenvironment, and a Comparison with the MART Index

Files in This Item:
p109-114-origin08.pdf447.53 kBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/38446

Title: Experimental Study of the Use of the Stable Isotopic Composition of Calcareous Microfossils in Shallow Marine Sediments for Reconstructing Paleoenvironment, and a Comparison with the MART Index
Authors: Ishimura, Toyoho Browse this author
Dick, Matthew H. Browse this author →KAKEN DB
Takashima, Reishi Browse this author
Hirose, Masato Browse this author
Gautam, Pitambar Browse this author →KAKEN DB
Nishi, Hiroshi Browse this author
Tsunogai, Urumu Browse this author
Keywords: Calcareous microfossil
Carbon
Oxygen
Shallow-water environment
Stable isotope
MART analysis
Issue Date: 2008
Publisher: 21st Century COE for Neo-Science of Natural History, Hokkaido University
Citation: Edited by Hisatake Okada, Shunsuke F. Mawatari, Noriyuki Suzuki, Pitambar Gautam. ISBN: 978-4-9903990-0-9
Journal Title: Origin and Evolution of Natural Diversity : Proceedings of the International Symposium, The Origin and Evolution of Natural Diversity, held from 1-5 October 2007 in Sapporo, Japan
Start Page: 109
End Page: 114
Abstract: For reconstruction of paleoenvironments using the isotopic compositions of shallow-water microfossils, especially benthic microfossils at high latitudes, difficulties arise due to variation in environmental factors, including seasonal temperature, depth, water currents, and habitat. In this study, we applied a microscale technique to determine stable carbon and oxygen isotopic ratios in shallow-water calcareous benthic microfossils (foraminifera and bryozoans), in order to choose suitable species for reconstructing paleoenvironmental changes in a Pleistocene shallow marine setting. We compared isotopic trends in Cibicides refulgens, a shallow water epibenthic foraminifer, with the mean annual range of temperature (MART) based on bryozoan analyses. We found no strong trend in δ13C composition in the foraminifers from stratigraphically sequential sediment samples of the Soebetsu Sandstone Member (~0.8 Ma) of the Pleistocene Setana Formation, but did find δ18O isotopic fluctuation among samples that was larger than the range of isotopic variation among individual foraminifera. MART values were almost identical from two strata showing a large difference in δ18O composition. We interpret our results to mean that the δ18O isotopic composition of benthic foraminifera was affected mainly by global and/or regional environmental changes rather than local temperature variation on the seafloor, in contrast to MART analysis, which reflects only annual range in local temperature. Further studies are needed on possible correlations between MART values and microscale isotopic determinations for calcareous microfossils in high-latitude shallow-water paleoenvironments.
Description: International Symposium, "The Origin and Evolution of Natural Diversity". 1–5 October 2007. Sapporo, Japan.
Conference Name: International Symposium, "The Origin and Evolution of Natural Diversity"
Conference Place: Sapporo
Type: proceedings
URI: http://hdl.handle.net/2115/38446
Appears in Collections:Origin and Evolution of Natural Diversity > Proceedings

Submitter: Gautam Pitambar

Export metadata:

OAI-PMH ( junii2 , jpcoar )


 

Feedback - Hokkaido University