Evaluation of Mg/Ca thermometry in foraminifera: Comparison of experimental results and measurements in nature

被引：100

作者：

Toyofuku, T ^{[1
]}

Kitazato, H

Kawahata, H

Tsuchiya, M

Nohara, M

机构：

[1] Shizuoka Univ, Fac Sci, Dept Life & Earth Sci, Shizuoka 4228529, Japan

[2] Geol Survey Japan, Marine Geol Dept, Tsukuba, Ibaraki 3058567, Japan

[3] Tohoku Univ, Grad Sch Sci, Sendai, Miyagi 980, Japan

来源：

PALEOCEANOGRAPHY | 2000年 / 15卷 / 04期

关键词：

D O I：

10.1029/1999PA000460

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We studied Mg/Ca in high-Mg, shallow-water benthic foraminifera in culture and in samples from natural environments, in order to evaluate the expression of latitudinal and seasonal temperature variability in Mg/Ca in their tests. We cultured Planoglabratella opercularis (d'Orbigny) and Quinqueloculina yabei Asano under controlled temperature (10 degrees-25 degrees C) and salinity (30-38) conditions. Both species show a linear correlation between Mg/Ga and temperature, but they differ in temperature sensitivity. Salinity does not significantly influence Mg/Ca. In the samples collected in nature, Mg/Ca and seawater temperatures are positively correlated, but there are more complexities than in the records for cultured specimens due to such factors as seasonal fluctuations in temperature. We conclude that Mg/Ca ratios in monospecific benthic foraminiferal samples may be used as a reliable temperature proxy, if the lifetime of the species is taken into account.

引用

页码：456 / 464

页数：9

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