Mg isotopes and Mg/Ca values of coccoliths from cultured specimens of the species Emiliania huxleyi and Gephyrocapsa oceanica SCIE SCOPUS

Cited 26 time in WEB OF SCIENCE Cited 26 time in Scopus
Title
Mg isotopes and Mg/Ca values of coccoliths from cultured specimens of the species Emiliania huxleyi and Gephyrocapsa oceanica
Author(s)
Ra, Kongtae; Kitagawa, Hiroyuki; Shiraiwa, Yoshihiro
KIOST Author(s)
Ra, Kongtae(나공태)
Publication Year
2010-12
Abstract
Coccoliths from cultured specimens of two species of coccolithophores (Emiliania huxleyi and Gephyrocapsa oceanica) were sampled during two growth phases (late exponential and stationary), and their Mg isotope values (delta Mg-26) as well as Mg/Ca values were measured in order to investigate whether delta Mg-26 can be used as a temperature proxy. Mg/Ca values were positively related with temperature (similar to 0.002 mmol/mol/degrees C), without statistically significant differences between the two growth phases and the two species. Both species were depleted in heavier Mg isotopes relative to the culture medium, and delta Mg-26 values were temperature dependent in both growth phases of E. huxleyi, although the delta Mg-26 values differed in the two growth phases. In G. oceanica, a weak correlation between delta Mg-26 values and temperature was seen in the late exponential growth phase only, and the delta Mg-26 values differed between growth phases. The large differences between delta(26)mg values as measured in calcite formed during different growth phases indicate that Mg isotopes of coccoliths cannot be simply used as a temperature proxy. Our conclusions are preliminary and more data must be collected in order to fully evaluate the use of Mg isotopes of coccoliths as a temperature proxy. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
ISSN
0377-8398
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4005
DOI
10.1016/j.marmicro.2010.08.003
Bibliographic Citation
MARINE MICROPALEONTOLOGY, v.77, no.3-4, pp.119 - 124, 2010
Publisher
ELSEVIER SCIENCE BV
Subject
COLLECTOR ICP-MS; BIOGENIC CARBONATES; FORAMINIFERAL MG/CA; CALCIUM CYCLE; MAGNESIUM; FRACTIONATION; TEMPERATURE; RATIOS; ALKENONES; SEAWATER
Keywords
Mg isotopes; Mg/Ca; Coccoliths; Coccolithophores; Temperature proxy
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

Marine chemistry,Isotope Biogeochemistry,Environmental Forensic,해양화학,동위원소 생지화학,환경법의학

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