Large 18O and 13C depletions in greenschist facies carbonate rocks, western Arizona

Research Article| October 01, 1997 Large 18O and 13C depletions in greenschist facies carbonate rocks, western Arizona Antonio Guerrera, Jr; Antonio Guerrera, Jr 1Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Search for other works by this author on: GSW Google Scholar Simon M. Peacock; Simon M. Peacock 1Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Search for other works by this author on: GSW Google Scholar L. Paul Knauth L. Paul Knauth 1Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Search for other works by this author on: GSW Google Scholar Author and Article Information Antonio Guerrera, Jr 1Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Simon M. Peacock 1Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 L. Paul Knauth 1Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1997) 25 (10): 943–946. https://doi.org/10.1130/0091-7613(1997)025<0943:LOACDI>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation Antonio Guerrera, Simon M. Peacock, L. Paul Knauth; Large 18O and 13C depletions in greenschist facies carbonate rocks, western Arizona. Geology 1997;; 25 (10): 943–946. doi: https://doi.org/10.1130/0091-7613(1997)025<0943:LOACDI>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Strongly deformed greenschist facies carbonate rocks in western Arizona exhibit large 18O and 13C depletions relative to unmetamorphosed correlative rocks in northeastern Arizona. Unmetamorphosed Permian Kaibab Formation carbonates on the Colorado Plateau yield δ13C values of +1‰ to +5‰ and δ18O values of +28‰ to +37‰. In contrast, greenschist facies Kaibab Formation in the Little Harquahala and Granite Wash Mountains yields δ13C values of −6‰ to +4‰ and δ18O values of +9‰ to +24‰. The magnitude of the observed 13C and 18O depletions cannot be explained by decarbonation reactions and requires extensive exchange with low δ13C and δ18O fluids. The 13C depletions may reflect isotopic exchange with lower δ13C carbonate in the underlying Paleozoic section and exchange with CO2 derived from oxidation of methane via reaction with hematite or sulfate in interbedded rocks. These data demonstrate that large 13C and 18O depletions can occur in strongly deformed terranes during very low-grade metamorphism. Depletions in 13C and 18O observed in some high-grade metamorphic terranes may be inherited from much lower metamorphic grades. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.