Growth and retrograde zoning in garnets from high-grade, metapelites: Implications for pressure-temperature paths

Abstract

Research Article| September 01, 1990 Growth and retrograde zoning in garnets from high-grade, metapelites: Implications for pressure-temperature paths M. E. Tuccillo; M. E. Tuccillo 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063 Search for other works by this author on: GSW Google Scholar E. J. Essene; E. J. Essene 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063 Search for other works by this author on: GSW Google Scholar B. A. van der Pluijm B. A. van der Pluijm 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063 Search for other works by this author on: GSW Google Scholar Author and Article Information M. E. Tuccillo 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063 E. J. Essene 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063 B. A. van der Pluijm 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1990) 18 (9): 839–842. https://doi.org/10.1130/0091-7613(1990)018<0839:GARZIG>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 MailTo Tools Icon Tools Get Permissions Search Site Citation M. E. Tuccillo, E. J. Essene, B. A. van der Pluijm; Growth and retrograde zoning in garnets from high-grade, metapelites: Implications for pressure-temperature paths. Geology 1990;; 18 (9): 839–842. doi: https://doi.org/10.1130/0091-7613(1990)018<0839:GARZIG>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 A previously unrecognized pattern of garnet zoning has been preserved in garnets from the upper amphibolite facies Britt domain, Ontario Grenville province. Some large garnets contain discrete regions of high grossular content as well as variations in the Mg/(Mg+Fe) and Mn nearly parallel to grain boundaries. The latter are superimposed on and cut across regions of high grossular content. Such crosscutting zoning patterns have not been previously recognized in garnets. The Ca zoning involves changes of 4 to 10 mol% grossular and is interpreted to represent growth zoning, whereas the decreasing Mg/(Mg+Fe) and increasing Mn from core to rim are believed to be a diffusional retrograde effect. The Ca zoning indicates a pressure drop of ca. 5 kbar at 700 ±50°C (<5°C/km). Preservation of grossular-rich areas also suggests that the diffusion rate of Ca is slower than those of Fe, Mn, and Mg in garnet. 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.