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• W2133398678 abstract "Research Article| March 01, 2009 Petrogenesis and structure of the Buck Creek mafic-ultramafic suite, southern Appalachians: Constraints on ophiolite evolution and emplacement in collisional orogens Virginia Peterson; Virginia Peterson † 1Department of Geology, Grand Valley State University, Allendale, Michigan 49401, USA †E-mail: petersvi@gvsu.edu Search for other works by this author on: GSW Google Scholar Jeffrey G. Ryan; Jeffrey G. Ryan 2Department of Geology, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, USA Search for other works by this author on: GSW Google Scholar 1997–1998 Research Experiences for Undergraduates (REU) Site Program Participants 1997–1998 Research Experiences for Undergraduates (REU) Site Program Participants Search for other works by this author on: GSW Google Scholar Author and Article Information Virginia Peterson † 1Department of Geology, Grand Valley State University, Allendale, Michigan 49401, USA Jeffrey G. Ryan 2Department of Geology, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, USA 1997–1998 Research Experiences for Undergraduates (REU) Site Program Participants †E-mail: petersvi@gvsu.edu Publisher: Geological Society of America Received: 03 Aug 2007 Revision Received: 08 May 2008 Accepted: 09 May 2008 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2009 Geological Society of America GSA Bulletin (2009) 121 (3-4): 615–629. https://doi.org/10.1130/B26302.1 Article history Received: 03 Aug 2007 Revision Received: 08 May 2008 Accepted: 09 May 2008 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Virginia Peterson, Jeffrey G. Ryan, 1997–1998 Research Experiences for Undergraduates (REU) Site Program Participants; Petrogenesis and structure of the Buck Creek mafic-ultramafic suite, southern Appalachians: Constraints on ophiolite evolution and emplacement in collisional orogens. GSA Bulletin 2009;; 121 (3-4): 615–629. doi: https://doi.org/10.1130/B26302.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Integration of detailed field, petrological, structural, and geochemical observations of the Buck Creek mafic-ultramafic suite, which is among the larger southern Appalachian ultramafic exposures, points to an igneous origin as a mid-ocean-ridge cumulate massif, with subsequent emplacement in a deep subduction-zone setting. These results help to clarify the unresolved role of “alpine-type” ultramafic bodies in the southern Appalachians, a problem complicated by their generally small and fragmented nature and by significant tectonic overprinting. As an ophiolite fragment, the Buck Creek rocks are unusual in their preservation of relatively high-pressure, anhydrous conditions, and thus they provide constraints on mechanisms of ophiolite emplacement.Field support for a cumulate origin for the Buck Creek suite includes centimeter- to meter-scale interlayering of dunite, troctolite, anorthosite, and spinel-rich layers, and local gradation between Buck Creek troctolitic rocks and surrounding amphibolites. Relict anorthitic plagioclase, forsteritic olivine, and augitic clinopyroxene define a “cumulate triangle” on an MgO versus Al2O3 diagram: meta-troctolite and meta-dunite compositions define a linear array between olivine and plagioclase compositions, and many amphibolites fall within this triangle, reflecting gabbroic protoliths. The relatively abundant troctolite cumulates, scarce pyroxene in the ultramafic rocks, and the high Al2O3/TiO2 and low Cr numbers in spinel best match LOT- or L-type (lherzolite) ophiolites, consistent with crystallization in a slow-spreading mid-ocean-ridge setting. Sapphirine-bearing, spinel symplectites in the metatroctolites suggest that Buck Creek rocks remained anhydrous to ~800 °C and ~0.9–1.1 GPa, representing conditions atypical of ophiolite emplacement. Comparisons to the Zermatt-Saas ophiolite and Bergen eclogite suggest rapid subduction of Buck Creek rocks to depths of ~30 km, where partial hydration, perhaps facilitated by pro-grade dehydration reactions in surrounding rocks, caused strain softening that permitted ductile disaggregation and aided in their emplacement into the overlying accretionary complex. Alternatively, emplacement might have resulted from a switch in subduction polarity, with hydration following emplacement. Uplift, shortening, and hydration within the accretionary sequences are responsible for the dominant structural features. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2133398678 title "Petrogenesis and structure of the Buck Creek mafic-ultramafic suite, southern Appalachians: Constraints on ophiolite evolution and emplacement in collisional orogens" @default.
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