{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/45389"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/45389","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Geochemical and petrologic study of the Fries-Rockfish Valley Fault near Roanoke, Virginia","abstract":"The Blue Ridge Province in southern and central Virginia is a complex slice of Precambrian basement emplaced on the margin of Laurentia during collisional events in the Paleozoic. This allochthonous basement is composed of Middle Proterozoic continental crust, Late Proterozoic intrusives, and Late Proterozoic-early Paleozoic metasediments and metavolcanics. Two distinct terranes within the Blue Ridge are separated by the northeast-trending and southeast dipping Fries-Rockfish Valley Fault Zone, exposed as a 1-10 km wide shear zone, formed during the middle Paleozoic Taconic Orogeny (425-450 Ma.). These terranes are referred to as the Pedlar massif, a high-grade granulite terrane, to the northwest and the Lovingston massif, a lower-grade amphibolite terrane to the southeast. The connection between these terranes has been debated for decades. A combined petrologic and geochemical approach has been applied in two transects across the shear zone, four kilometers apart along strike near Roanoke, Virginia, to study the geochemical and petrologic evidence of shearing along the fault and constrain the nature and timing of possible retrogressive and fluid infiltration events that affected these rocks. Mineral assemblages and microstructures at the northeastern Horsepen Mountain and at the southwestern Explore Park transects indicate that deformation occurred along the fault under greenshist facies conditions.","abstract_html":"The Blue Ridge Province in southern and central Virginia is a complex slice of Precambrian basement emplaced on the margin of Laurentia during collisional events in the Paleozoic. This allochthonous basement is composed of Middle Proterozoic continental crust, Late Proterozoic intrusives, and Late Proterozoic-early Paleozoic metasediments and metavolcanics. Two distinct terranes within the Blue Ridge are separated by the northeast-trending and southeast dipping Fries-Rockfish Valley Fault Zone, exposed as a 1-10 km wide shear zone, formed during the middle Paleozoic Taconic Orogeny (425-450 Ma.). These terranes are referred to as the Pedlar massif, a high-grade granulite terrane, to the northwest and the Lovingston massif, a lower-grade amphibolite terrane to the southeast. The connection between these terranes has been debated for decades. A combined petrologic and geochemical approach has been applied in two transects across the shear zone, four kilometers apart along strike near Roanoke, Virginia, to study the geochemical and petrologic evidence of shearing along the fault and constrain the nature and timing of possible retrogressive and fluid infiltration events that affected these rocks. Mineral assemblages and microstructures at the northeastern Horsepen Mountain and at the southwestern Explore Park transects indicate that deformation occurred along the fault under greenshist facies conditions.","abstract_has_math":false,"creators":["Holmstad, Erin Frances"],"institution":"Virginia Tech","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Geology","degree_department":"Geology","school":null,"contributors":[],"advisors":[],"committee_chairs":["Tracy, Robert J."],"committee_members":["Bodnar, Robert J.","Henika, William S."],"year":1996,"date_issued":"1996-05-15","date_published":"1996-05-15","updated_at":"2026-07-22T22:20:43Z","subjects":["geochemistry","shear","metamorphic petrology"],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-11012008-063059"],"render_values":[{"text":"etd-11012008-063059","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10919/45389","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.committeechair","label":"Committee Chair","values":["Tracy, Robert J."]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Bodnar, Robert J.","Henika, William S."]},{"key":"dc:contributor.department","label":"Department","values":["Geology"]},{"key":"dc:creator","label":"Author","values":["Holmstad, Erin Frances"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-03-14T21:48:38Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-03-14T21:48:38Z","2008-11-01"]},{"key":"dc:date.issued","label":"Date","values":["1996-05-15"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Tech"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Geology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["geochemistry","shear","metamorphic petrology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-11012008-063059"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/45389"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The Blue Ridge Province in southern and central Virginia is a complex slice of Precambrian basement emplaced on the margin of Laurentia during collisional events in the Paleozoic. This allochthonous basement is composed of Middle Proterozoic continental crust, Late Proterozoic intrusives, and Late Proterozoic-early Paleozoic metasediments and metavolcanics. Two distinct terranes within the Blue Ridge are separated by the northeast-trending and southeast dipping Fries-Rockfish Valley Fault Zone, exposed as a 1-10 km wide shear zone, formed during the middle Paleozoic Taconic Orogeny (425-450 Ma.). These terranes are referred to as the Pedlar massif, a high-grade granulite terrane, to the northwest and the Lovingston massif, a lower-grade amphibolite terrane to the southeast. The connection between these terranes has been debated for decades. A combined petrologic and geochemical approach has been applied in two transects across the shear zone, four kilometers apart along strike near Roanoke, Virginia, to study the geochemical and petrologic evidence of shearing along the fault and constrain the nature and timing of possible retrogressive and fluid infiltration events that affected these rocks. Mineral assemblages and microstructures at the northeastern Horsepen Mountain and at the southwestern Explore Park transects indicate that deformation occurred along the fault under greenshist facies conditions."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["BTD"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Geochemical and petrologic study of the Fries-Rockfish Valley Fault near Roanoke, Virginia"]}]}],"canonical_facts":{"dc:contributor.committeechair":["Tracy, Robert J."],"dc:contributor.committeemember":["Bodnar, Robert J.","Henika, William S."],"dc:contributor.department":["Geology"],"dc:creator":["Holmstad, Erin Frances"],"dc:date.accessioned":["2014-03-14T21:48:38Z"],"dc:date.available":["2014-03-14T21:48:38Z","2008-11-01"],"dc:date.issued":["1996-05-15"],"dc:description.abstract":["The Blue Ridge Province in southern and central Virginia is a complex slice of Precambrian basement emplaced on the margin of Laurentia during collisional events in the Paleozoic. This allochthonous basement is composed of Middle Proterozoic continental crust, Late Proterozoic intrusives, and Late Proterozoic-early Paleozoic metasediments and metavolcanics. Two distinct terranes within the Blue Ridge are separated by the northeast-trending and southeast dipping Fries-Rockfish Valley Fault Zone, exposed as a 1-10 km wide shear zone, formed during the middle Paleozoic Taconic Orogeny (425-450 Ma.). These terranes are referred to as the Pedlar massif, a high-grade granulite terrane, to the northwest and the Lovingston massif, a lower-grade amphibolite terrane to the southeast. The connection between these terranes has been debated for decades. A combined petrologic and geochemical approach has been applied in two transects across the shear zone, four kilometers apart along strike near Roanoke, Virginia, to study the geochemical and petrologic evidence of shearing along the fault and constrain the nature and timing of possible retrogressive and fluid infiltration events that affected these rocks. Mineral assemblages and microstructures at the northeastern Horsepen Mountain and at the southwestern Explore Park transects indicate that deformation occurred along the fault under greenshist facies conditions."],"dc:description.degree":["Master of Science"],"dc:format.medium":["BTD"],"dc:format.mimetype":["application/pdf"],"dc:identifier.other":["etd-11012008-063059"],"dc:identifier.uri":["http://hdl.handle.net/10919/45389"],"dc:language.iso":["en"],"dc:publisher":["Virginia Tech"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:subject":["geochemistry","shear","metamorphic petrology"],"dc:title":["Geochemical and petrologic study of the Fries-Rockfish Valley Fault near Roanoke, Virginia"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Geology"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:20:43Z"}