Stable isotopes in late Pennsylvanian brachiopods from the United States: implications for Carboniferous paleoceanography

E. L. Grossman, Horng-Sheng Mii, T. E. Yancey

Research output: Contribution to journalArticle

108 Citations (Scopus)


Stable isotopic analyses have been performed on nearly 500 nonluminescent brachiopod shells from Kansas, New Mexico, and Texas to evaluate temporal and geographic variability in the carbon and oxygen isotopic record for Late Pennsylvanian time. Regional variations are observed in the δ18O and δ13C values of nonluminescent brachiopod shells of the same genera. Data for nonluminescent brachiopods and marine cements reveal a mid-Carboniferous δ13C increase of 2‰ in Paleotethyan sea water. This increase is not seen in samples from the North American epicontinental seas, which opened to the Panthalassa ocean. This regional difference in δ13C appears to be due to changes in ocean circulation associated with the closing of the equatorial seaway and formation of Pangea. -from Authors

Original languageEnglish
Pages (from-to)1284-1296
Number of pages13
JournalGeological Society of America Bulletin
Issue number10
Publication statusPublished - 1993 Jan 1


ASJC Scopus subject areas

  • Geology

Cite this