Friedman et al. Reply to "comment on C stable isotope standards"

Reply to "comment on two new carbonate stable isotope standards"

I. Friedman, J.R. O'Neil and G.T. Cebula

United States Department of the Interior, Geological Survey, Box 25046, M.S. 963, Denver, Colorado 80225, U.S.A.

Summary
The authors expended considerable effort searching for a natural carbonate that (a) has d-values within ±0.5 permil of PDB, (b) is isotopically uniform, and (c) of a large enough grain size to be suitable for a standard. Marbles are the only natural carbonates that satisfy criteria (b) and (c) but, unfortunately, there are no marbles with the desired isotopic composition. NBS-19, a standard already in use by several workers, provides a ready compromise as its d-values are within ±2 permil of PDB (1).

Geostandards Newsletter (1982), Vol. 6 No. 2 pp. 259 HTML VERSION

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