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. Author manuscript; available in PMC: 2018 Jan 13.
Published in final edited form as: Astrobiology. 2017 May;17(5):413–430. doi: 10.1089/ast.2016.1563

FIG. 7.

FIG. 7

Stable isotope results for calcified filaments located in the upper 3 mm of thrombolite-forming button mat. (A) Oxygen isotope values of organic and inorganic fractions using both bulk and SIMS analysis. Analyses were completed for both background carbonate precipitates (sediment), calcified filaments (filaments), and untreated whole mat samples. (B) Carbon and nitrogen isotope values of both organic and inorganic fractions using both bulk and SIMS analysis. (C) Comparative plot of SIMS values collected for oxygen and carbon isotopes. All results are expressed in delta notation with respect to the carbon/oxygen Vienna Pee Dee Belemnite (VPDB) or nitrogen air (AIR) standard.