Blue Ridge Ophiolite: Difference between revisions
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= Mineralogy = |
= Mineralogy = |
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[[File:New Dale Dunite.jpg|thumb|A sample of the New Dale [[Dunite]] from Dale North Carolina.]] |
[[File:New Dale Dunite.jpg|thumb|A sample of the New Dale [[Dunite]] from Dale North Carolina.]] |
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Revision as of 15:08, 26 March 2021
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Mineralogy
The Blue Ridge Ophiolite is an ultramafic group[1]. The major of the Blue Ridge Ophiolite is comprised of Dunite[1]. The mineralogy of the Blue Ridge Ophiolite shows evidence of metamorphism through minerals that only occur due to metamorphism[2]. With Olivine being the the most consistently abundant mineral found in formation[1]. Other minerals found in noticeable amounts in the formation are Orthopyroxene, Clinopyroxene, and Chromite[1]. Some minerals that also appear but in smaller amounts are Chlorite, Tremolite and Hornblende.[1] In rare cases Garnets and plagioclase can be found in samples.[3] Fluid and differential stress are the causes of the metamorphic minerals found in the rocks[4].
Location
The Blue Ridge Ophiolite occurs in western North Carolina[3]. Insert map[5]
Formation
Oldest dated sample of the Blue Ridge Ophiolite ,at Buck Creek NC, show 458 million years old[5] Exanimation of Chromite found rock samples show deformation as far back as the Ordovician[2].
References
Citations
- ^ a b c d e Raymond, Loren A.; Swanson, Samuel E.; Love, Anthony B.; Allan, James F. (2003). "Cr-spinel compositions, metadunite petrology, and the petrotectonic history of Blue Ridge ophiolites, Southern Appalachian Orogen, USA". Geological Society, London, Special Publications. 218 (1): 253–278. doi:10.1144/gsl.sp.2003.218.01.14. ISSN 0305-8719.
- ^ a b Lipin, Bruce R. (1984-05-01). "Chromite from the Blue Ridge Province of North Carolina". American Journal of Science. 284 (4–5): 507–529. doi:10.2475/ajs.284.4-5.507. ISSN 0002-9599.
- ^ a b Anderson, Eric Douglas; Moecher, David P. (2009). "Formation of high-pressure metabasites in the southern Appalachian Blue Ridge via Taconic continental subduction beneath the Laurentian margin". Tectonics. 28 (5). doi:10.1029/2008TC002319. ISSN 1944-9194.
- ^ Kulp, John Laurence; Brobst, Donald Albert (1954-03-01). "Notes on the dunite and the geochemistry of vermiculite at the Day Book dunite deposit, Yancey County, North Carolina". Economic Geology. 49 (2): 211–220. doi:10.2113/gsecongeo.49.2.211. ISSN 1554-0774.
- ^ a b Peterson, Virginia; Ryan, Jeffrey G.; Participants, 1997-1998 Research Experiences for Undergraduates (REU) Site Program (2009-03-01). "Petrogenesis and structure of the Buck Creek mafic-ultramafic suite, southern Appalachians: Constraints on ophiolite evolution and emplacement in collisional orogensBuck Creek complex petrogenesis". GSA Bulletin. 121 (3–4): 615–629. doi:10.1130/B26302.1. ISSN 0016-7606.
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