Frontal vs. basal accretion and contrasting particle paths in metamorphic thrust belts

Research Article| January 01, 1994 Frontal vs. basal accretion and contrasting particle paths in metamorphic thrust belts Jeroen A. M. van Gool; Jeroen A. M. van Gool 1Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X5, Canada Search for other works by this author on: GSW Google Scholar Peter A. Cawood Peter A. Cawood 1Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X5, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Jeroen A. M. van Gool 1Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X5, Canada Peter A. Cawood 1Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X5, Canada Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1994) 22 (1): 51–54. https://doi.org/10.1130/0091-7613(1994)022<0051:FVBAAC>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 Email Permissions Search Site Citation Jeroen A. M. van Gool, Peter A. Cawood; Frontal vs. basal accretion and contrasting particle paths in metamorphic thrust belts. Geology 1994;; 22 (1): 51–54. doi: https://doi.org/10.1130/0091-7613(1994)022<0051:FVBAAC>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 Fold-and-thrust belts at the Appalachian and Grenvillian oro genic fronts developed in similar continental-margin tectonic settings but show marked contrasts in the relative timing of thrust stacking and metamorphism. In the Corner Brook Lake thrust belt of the Appalachian orogen in Newfoundland, thrust stacking took place at shallowcrustal levels and was followed by the development of a foliation under increasing metamorphic conditions. The peak of metamorphism post-dated thrusting and overprinted the foliation. In the Grenvillian Gagnon thrust belt in western Labrador, development of a foliation and the stacking of the thrust sheets occurred at near-peak metamorphic conditions at upper- to middle-crustal levels. These contrasting defor-mational and metamorphic histories reflect different modes of accretion in metamorphic thrust wedges. In the Corner Brook Lake thrust belt, rocks were accreted at the toe of the wedge (frontal accretion) and subsequently were buried by deformation of the wedge. In the Gagnon belt, thrust sheets were accreted at the base of the wedge (basal ac- cretion), after burial beneath the advancing wedge. The two examples demonstrate how basic field observations and petrographic tools can be used to determine the mode of accretion within a metamorphic thrust wedge. 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.