HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >


Files in This Item:
GCj_32_87-.pdf970.72 kBPDFView/Open
Please use this identifier to cite or link to this item:

Title: 冷凍マイクロトーム法による現生シャコガイ殻の酸素同位体比分析より推定される詳細な水温変化
Other Titles: High resolution reconstruction of water temperature estimated from oxygen isotopic ratios of a modern Tridacna shell based on freezing microtome sampling technique
Authors: 渡邊, 剛1 Browse this author →KAKEN DB
大場, 忠道2 Browse this author
Authors(alt): WATANABE, Tsuyoshi1
OBA, Tadamichi2
Keywords: oxygen isotope
Tridacna shell
high resolution
Ishigaki Island
calculated temperature
freezing microtome sampling
Issue Date: 20-May-1998
Publisher: 日本地球化学会
Journal Title: 地球化学
Volume: 32
Issue: 2
Start Page: 87
End Page: 95
Abstract: A modern Tridacna (Hippopus hippopus) was collected on September 5,1993 from a coral reef at Ishigaki Island in Ryukyu Archipelago, Japan, in order to investigate the environmental changes recorded in the shell. We adopted freezing microtome technique for high resolution analysis of the oxygen isotope of the shell. A portion of the innner layer, where daily growth lines are observed under a microscope, was cut out vertically from the inner surface. A stick measuring 20x1x2mm was then placed in water and frozen. Using a microtome, 50um interval samples were pealed off the stick in a room maintained at -20℃. We determined the date of the formation of each sample by measuring the distance from the inner surface of the shell and by counting the daily growth lines. The water temperatures estimated from the oxygen isotopic values at 1-2 day intervals agreed very well (correlation coefficient: 0.90) with the observed water temperatures which have a seasonal temperature range between about 20℃ and 32℃. This implies that the Tridacna precipitates its shell in isotopic equilibrium with the surrounding sea water and that the oxygen isotope values are mainly determined by the water temperature.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡邊 剛

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University