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Volumn 274, Issue 5289, 1996, Pages 961-963

Mg/Ca thermometry in coral skeletons

Author keywords

[No Author keywords available]

Indexed keywords

CALCIUM; MAGNESIUM; SEA WATER;

EID: 0029659191     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.274.5289.961     Document Type: Article
Times cited : (303)

References (31)
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    • 18O, the conventional reference standard is the Pee Dee belemnite (PDB).
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    • J. W. Beck et al., Science 257, 644 (1992); ibid. 264, 891 (1994).
    • (1994) Science , vol.264 , pp. 891
  • 11
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    • note
    • 18O was estimated at 0.06 per mil (2σ) after 20 runs of 0.5 mg reference carbonate.
  • 12
    • 10544255428 scopus 로고    scopus 로고
    • note
    • First, we cleaned the samples with 1 ml of distilled (deionized) water at room temperature, followed by addition of 1 ml of 4 mM nitric acid at room temperature and then 2 ml of 30% hydrogen peroxide at 60°C, all in an ultrasonic cleaner for 15 min.
  • 13
    • 10544236990 scopus 로고    scopus 로고
    • note
    • Typically, 1 mg of the washed subsample finally obtained was dissolved in 4 g of 0.5 M nitric acid for sequential triplicate measurements of Mg, Sr, and Ca by ICP-AES with Seiko SPS-7000A.
  • 14
    • 10544254754 scopus 로고    scopus 로고
    • note
    • The sample for x-ray diffraction was taken from adjacent parts of the transect and homogenized in an agate mortar. We used copper Kα radiation. A scan was made at the rate of 1 degree (2θ) per minute between 20 and 60 degrees (2θ).
  • 15
    • 10544240434 scopus 로고    scopus 로고
    • note
    • Anomalies for annual maxima and minima are differences from the mean values for annual maxima and minima, respectively, over the period 1986-1993.
  • 16
    • 10544227374 scopus 로고    scopus 로고
    • note
    • We estimated the analytical errors (2σ) for the Mg/Ca and Sr/Ca ratios with the following method. We crushed and homogenized 10 g of coral sample cut from other parts of the sliced core in an agate mortar. Twenty-five coral powder fractions of 1.5 mg each were taken from the whole and cleaned and used for measurements (10, 11). The average analytical errors (2σ) for the Mg/Ca and Sr/Ca ratios were 0.068 and 0.10 mmol/mol, respectively.
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    • J. H. Carpenter and M. E. Manelia, J. Geophys. Res. 78, 3621 (1973); S. Tsuriogai, H. Yamahata, S. Kudo, O. Saito, Deep-Sea Res. 20, 717 (1973); Y. Horibe, K. Endo, H. Tsubota, Earth Planet. Sci. Lett. 23, 136 (1974).
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    • Carpenter, J.H.1    Manelia, M.E.2
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    • J. H. Carpenter and M. E. Manelia, J. Geophys. Res. 78, 3621 (1973); S. Tsuriogai, H. Yamahata, S. Kudo, O. Saito, Deep-Sea Res. 20, 717 (1973); Y. Horibe, K. Endo, H. Tsubota, Earth Planet. Sci. Lett. 23, 136 (1974).
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    • Lamont-Doherty Geological Observatory, Columbia University, New York
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    • S. de Villiers, G. T. Shen, B. K. Nelson, Geochim. Cosmochim. Acta 58, 197 (1994); S. de Villiers, B. K. Nelson, A. R. Chivas, Science 269, 1247 (1995); T. McConnaughey, Geochim. Cosmochim. Acta 53, 151 (1989).
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    • note
    • The comparison is based on the following: The annual extrema of each tracer are assigned to the corresponding annual extrema of the SST record, and coral growth rate is assumed to be constant between the extrema.
  • 31
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    • note
    • We thank B. Parker of the Australian Institute of Marine Science for drilling the coral core and R. G. Fairbanks of the Lamont-Doherty Earth Observatory of Columbia University for helpful comments.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.