Pyrrhotite Isograd in Southeastern Tennessee and Southwestern North Carolina

Abstract

Research Article| March 01, 1974 Pyrrhotite Isograd in Southeastern Tennessee and Southwestern North Carolina ROBERT HERON CARPENTER ROBERT HERON CARPENTER 1Department of Geology, University of Georgia, Athens, Georgia 30601 Search for other works by this author on: GSW Google Scholar Author and Article Information ROBERT HERON CARPENTER 1Department of Geology, University of Georgia, Athens, Georgia 30601 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1974) 85 (3): 451–456. https://doi.org/10.1130/0016-7606(1974)85<451:PIISTA>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation ROBERT HERON CARPENTER; Pyrrhotite Isograd in Southeastern Tennessee and Southwestern North Carolina. GSA Bulletin 1974;; 85 (3): 451–456. doi: https://doi.org/10.1130/0016-7606(1974)85<451:PIISTA>2.0.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 SocietyGSA Bulletin Search Advanced Search Abstract The first appearance of pyrrhotite in the Barrovian-type metamorphic succession of the Blue Ridge province of southeastern Tennessee and southwestern North Carolina is interpreted to represent a metamorphic isograd located in the upper chlorite zone slightly west of the biotite isograd. At lower grades of metamorphism, pyrite is the only recognizable iron sulfide, and it is characterized by textures indicating an arrested state of growth. Concentrations of pyrite are commonly aligned parallel to bedding planes. Pyrrhotite appears as streaks along slaty cleavage and is preferentially developed in pyrite-bearing zones. Hexagonal pyrrhotite is dominant, but monoclinic and monoclinic + hexagonal intergrowths also occur. Where pyrrhotite is present, coexisting pyrite is typically replaced by quartz, chlorite, and biotite. The sulfur and some of the iron contained in pyrrhotite is interpreted to have been derived locally from the replaced pyrite simultaneously with the development of metamorphic minerals. 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.