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Carbonate clumped isotope thermometry of deep-sea corals and implications for vital effects
 

Summary: Carbonate clumped isotope thermometry of deep-sea corals
and implications for vital effects
Nivedita Thiagarajan
, Jess Adkins, John Eiler
California Institute of Technology, Division of Geological and Planetary Sciences, 1200 E California Blvd., Pasadena, CA 91125, USA
Received 1 March 2010; accepted in revised form 4 April 2011; available online 17 May 2011
Abstract
Here we calibrate the carbonate clumped isotope thermometer in modern deep-sea corals. We examined 11 specimens of
three species of deep-sea corals and one species of a surface coral spanning a total range in growth temperature of 225 C.
External standard errors for individual measurements ranged from 0.005& to 0.011& (average: 0.0074&) which corresponds
to $12 C. External standard errors for replicate measurements of D47 in corals ranged from 0.002& to 0.014& (average:
0.0072&) which corresponds to 0.42.8 C. We find that skeletal carbonate from deep-sea corals shows the same relationship
of D47 (the measure of 13
C18
O ordering) to temperature as does inorganic calcite. In contrast, the d13
C and d18
O values of
these carbonates (measured simultaneously with D47 for every sample) differ markedly from equilibrium with seawater; i.e.,
these samples exhibit pronounced `vital effects' in their bulk isotopic compositions. We explore several reasons why the
clumped isotope compositions of deep-sea coral skeletons exhibit no evidence of a vital effect despite having large

  

Source: Adkins, Jess F. - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collections: Environmental Sciences and Ecology; Geosciences