Evidence for extensive Hercynian metamorphism in western Maine

Research Article| October 01, 1985 Evidence for extensive Hercynian metamorphism in western Maine D. R. Lux; D. R. Lux 1Department of Geological Sciences, University of Maine at Orono, Orono, Maine 04469 Search for other works by this author on: GSW Google Scholar C. V. Guidotti C. V. Guidotti 1Department of Geological Sciences, University of Maine at Orono, Orono, Maine 04469 Search for other works by this author on: GSW Google Scholar Author and Article Information D. R. Lux 1Department of Geological Sciences, University of Maine at Orono, Orono, Maine 04469 C. V. Guidotti 1Department of Geological Sciences, University of Maine at Orono, Orono, Maine 04469 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1985) 13 (10): 696–700. https://doi.org/10.1130/0091-7613(1985)13<696:EFEHMI>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 MailTo Tools Icon Tools Get Permissions Search Site Citation D. R. Lux, C. V. Guidotti; Evidence for extensive Hercynian metamorphism in western Maine. Geology 1985;; 13 (10): 696–700. doi: https://doi.org/10.1130/0091-7613(1985)13<696:EFEHMI>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 SocietyGeology Search Advanced Search Abstract 40Ar/39Ar release spectrum ages for five hornblendes from two Acadian plutons in western Maine and petrologic observations for nearby metamorphic rocks are interpreted to indicate that high-grade K-feldspar + sillimanite metamorphism occurred during Carboniferous time, not Devonian time as previously believed. The metamorphism was closely associated in time with the emplacement of the Sebago batholith, 325 Ma. Petrologic data suggest that rocks as far as 30 km north of the Sebago batholith were affected. Release spectrum ages for hornblendes from the Songo pluton indicate that by 300 Ma high-grade metamorphic conditions had ended and cooling through 500 °C had occurred. 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.