Prograde and retrograde history of eclogites from the Eastern Blue Ridge, North Carolina, USA
dc.contributor.author | Page, F. Z. | en_US |
dc.contributor.author | Essene, Eric J. | en_US |
dc.contributor.author | Mukasa, Samuel B. | en_US |
dc.date.accessioned | 2010-06-01T20:24:28Z | |
dc.date.available | 2010-06-01T20:24:28Z | |
dc.date.issued | 2003-09 | en_US |
dc.identifier.citation | Page, F. Z.; Essene, E. J.; Mukasa, S. B. (2003). "Prograde and retrograde history of eclogites from the Eastern Blue Ridge, North Carolina, USA." Journal of Metamorphic Geology 21(7): 685-698. <http://hdl.handle.net/2027.42/73522> | en_US |
dc.identifier.issn | 0263-4929 | en_US |
dc.identifier.issn | 1525-1314 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/73522 | |
dc.description.abstract | The prograde metamorphism of eclogites is typically obscured by chemical equilibration at peak conditions and by partial requilibration during retrograde metamorphism. Eclogites from the Eastern Blue Ridge of North Carolina retain evidence of their prograde path in the form of inclusions preserved in garnet. These eclogites, from the vicinity of Bakersville, North Carolina, USA are primarily comprised of garnet–clinopyroxene–rutile–hornblende–plagioclase–quartz. Quartz, clinopyroxene, hornblende, rutile, epidote, titanite and biotite are found as inclusions in garnet cores. Included hornblende and clinopyroxene are chemically distinct from their matrix counterparts. Thermobarometry of inclusion sets from different garnets record different conditions. Inclusions of clinozoisite, titanite, rutile and quartz (clinozoisite + titanite = grossular + rutile + quartz + H 2 O) yield pressures (6–10 kbar, 400–600 °C and 8–12 kbar 450–680 °C) at or below the minimum peak conditions from matrix phases (10–13 kbar at 600–800 °C). Inclusions of hornblende, biotite and quartz give higher pressures (13–16 kbar and 630–660 °C). Early matrix pyroxene is partially or fully broken down to a diopside–plagioclase symplectite, and both garnet and pyroxene are rimmed with plagioclase and hornblende. Hypersthene is found as a minor phase in some diopside + plagioclase symplectites, which suggests retrogression through the granulite facies. Two-pyroxene thermometry of this assemblage gives a temperature of c. 750 °C. Pairing the most Mg-rich garnet composition with the assemblage plagioclase–diopside–hypersthene–quartz gives pressures of 14–16 kbar at this temperature. The hornblende–plagioclase–garnet rim–quartz assemblage yields 9–12 kbar and 500–550 °C. The combined P–T data show a clockwise loop from the amphibolite to eclogite to granulite facies, all of which are overprinted by a texturally late amphibolite facies assemblage. This loop provides an unusually complete P–T history of an eclogite, recording events during and following subduction and continental collision in the early Palaeozoic. | en_US |
dc.format.extent | 876841 bytes | |
dc.format.extent | 3109 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.publisher | Blackwell Science Inc | en_US |
dc.rights | 2003 Blackwell Publishing Ltd | en_US |
dc.subject.other | Blue Ridge | en_US |
dc.subject.other | Eclogite | en_US |
dc.subject.other | Prograde Metamorphism | en_US |
dc.subject.other | Retrograde Metamorphism | en_US |
dc.subject.other | Southern Appalachians | en_US |
dc.title | Prograde and retrograde history of eclogites from the Eastern Blue Ridge, North Carolina, USA | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Geology and Earth Sciences | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, University of Michigan, 2534 C.C. Little Building, Ann Arbor, MI 48109–1063, USA ( fpage@umich.edu ) | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/73522/1/j.1525-1314.2003.00479.x.pdf | |
dc.identifier.doi | 10.1046/j.1525-1314.2003.00479.x | en_US |
dc.identifier.source | Journal of Metamorphic Geology | en_US |
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dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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