Facies control on carbonate δ13C on the Great Bahama Bank

Emily C. Geyman, Adam C. Maloof

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


The carbon isotopic (δ13C) composition of shallow-water carbonates often is interpreted to reflect the δ13C of the global ocean and is used as a proxy for changes in the global carbon cycle. However, local platform processes, in addition to meteoric and marine diagenesis, may decouple carbonate δ13C from that of the global ocean. We present new δ13C measurements of benthic foraminifera, solitary corals, calcifying green algae, ooids, coated grains, and lime mud from the modern Great Bahama Bank. We find that vital effects, cross-shelf seawater chemistry gradients, and meteoric diagenesis produce carbonate with δ13C variability rivaling that of the past two billion years of Earth history. Leveraging Walther’s Law, we illustrate how these local δ13C signals can find their way into the stratigraphic record of bulk carbonate.

Original languageEnglish (US)
Pages (from-to)1049-1054
Number of pages6
Issue number9
StatePublished - Sep 2021

All Science Journal Classification (ASJC) codes

  • Geology


Dive into the research topics of 'Facies control on carbonate δ13C on the Great Bahama Bank'. Together they form a unique fingerprint.

Cite this