40Ar/39Ar geochronology and exhumation of high-pressure to ultrahigh-pressure metamorphic rocks in east-central China

Research Article| July 01, 1994 40Ar/39Ar geochronology and exhumation of high-pressure to ultrahigh-pressure metamorphic rocks in east-central China Elizabeth A. Eide; Elizabeth A. Eide 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115 Search for other works by this author on: GSW Google Scholar Michael O. McWilliams; Michael O. McWilliams 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115 Search for other works by this author on: GSW Google Scholar Juhn G. Liou Juhn G. Liou 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115 Search for other works by this author on: GSW Google Scholar Geology (1994) 22 (7): 601–604. https://doi.org/10.1130/0091-7613(1994)022<0601:AAGAEO>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 Elizabeth A. Eide, Michael O. McWilliams, Juhn G. Liou; 40Ar/39Ar geochronology and exhumation of high-pressure to ultrahigh-pressure metamorphic rocks in east-central China. Geology 1994;; 22 (7): 601–604. doi: https://doi.org/10.1130/0091-7613(1994)022<0601:AAGAEO>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 New 40Ar/39Ar ages from rocks in the high-pressure and ultra-high-pressure (HP-UHP) metamorphic complex in the Hong'an and Dabie Mountains areas, east- Central China, document a two-phase cooling and exhumation history following Triassic continental collision and metamorphism. Phengite ages from blueschist through kyanite-bearing eclogite facies rocks in Hong'an record initial exhumation from the collision zone between 230 and 195 Ma. Biotite and hornblende ages from migmatites and eclogite-bearing gneisses from the Dabie Mountains record a cooling event between 128 and 117 Ma, corresponding to a regional episode of crustal anatexis and emplacement of granitic plutons.The Triassic through Early Jurassic 40Ar/39Ar cooling ages corroborate U-Pb and Sm-Nd metamorphic ages from previous studies and suggest that initial exhumation of these rocks was rapid. Emplacement of granitic melts within the HP-UHP sequences ∼80 m.y. after metamorphism suggests that the metamorphic rocks were either exhumed at slower rates or became arrested at depth subsequent to the initial, rapid exhumation episode. 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.