Strontianite in coral skeletal aragonite

Science

Volumn 275, Issue 5305, 1997, Pages 1452-1454

  Greegor, Robert B ^a   Pingitore Jr , Nicholas E ^b   Lytle, Farrel W ^c  

^a BOEING COMPANY   (United States)

^b UNIVERSITY OF TEXAS AT EL PASO   (United States)

^c EXAFS Company   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CALCIUM CARBONATE; SEA WATER;

ARTICLE; CHEMICAL ANALYSIS; CORAL; FOURIER TRANSFORMATION; PRIORITY JOURNAL; SPECIES DIFFERENCE; WATER TEMPERATURE;

ANIMALS; CALCIUM; CALCIUM CARBONATE; CARBONATES; CNIDARIA; FOURIER ANALYSIS; SPECTRUM ANALYSIS; STRONTIUM; TEMPERATURE;

ARAGONITE; ARASONITE; CORAL; PALAEOTEMPERATURE; PARTITIONING; SEAWATER; SKELETAL COMPOSITION; STONTIANITE; STRONTIUM; STRONTIUM COMPOUNDS;

EID: 0030621284     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.275.5305.1452     Document Type: Article

References (22)

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17. Samples were powdered and scanned from 10° < 2θ < 70° on an x-ray powder diffractometer. All major aragonite peaks were present and identified. No other peaks were encountered, implying a purity in excess of 98% aragonite. Strontium and calcium were determined in these samples by direct current plasma atomic emission spectroscopy.
18. The materials for XAS analysis were ground to fine powders of 300 to 400 mesh size. The standards were mixed in Duco cement, and spread as a thin layer on Al foil. Beam line 4-1 at SSRL was used with a Si(111) (for Ca) and Si(220) (for Sr) monochromator. The stored electron beam energy was 3 GeV at a current of 50 to 90 mA. The monochromator was detuned to reduce harmonics, and the slits were set at 1 mm by 20 mm to give ∼1 - and 4-eV resolution at the Ca and Sr K-edges, respectively. The data were gathered in fluorescence mode for the corals and in absorption mode for the standards. The Ca K-edge experiment was performed in the electron yield mode, as noted in the data where appropriate.
19. 2, for which we made an estimate for the fractional parameter u of 0.391.
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22. The research of R.B.G. was supported by the U.S. Department of Energy (DOE), Office of Basic Energy Sciences, under grant DE-FG06-84ER45121. For user support and synchrotron beam time, we thank SSRL, which is funded by DOE, Office of Basic Energy Sciences, and NIH, Biotechnology Resource Program, Division of Research Resources. N.E.P. thanks T. Pogue for laboratory assistance at the University of Texas at El Paso, El Paso, and L. N. Plummer and P. D. Glynn of the U.S. Geological Survey, Reston, VA, for discussions. We thank J. R. Greegor for help in data preparation and handling.