Abstract
Research Article| October 01, 1993 Geologic consequences of plate reorganization: An example from the Eocene southern Alaska fore arc Virginia B. Sisson; Virginia B. Sisson 1Department of Geology and Geophysics, Rice University, Houston, Texas 77251-1892 Search for other works by this author on: GSW Google Scholar Terry L. Pavlis Terry L. Pavlis 2Department of Geology and Geophysics, University of New Orleans, New Orleans, Louisiana 70148 Search for other works by this author on: GSW Google Scholar Author and Article Information Virginia B. Sisson 1Department of Geology and Geophysics, Rice University, Houston, Texas 77251-1892 Terry L. Pavlis 2Department of Geology and Geophysics, University of New Orleans, New Orleans, Louisiana 70148 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1993) 21 (10): 913–916. https://doi.org/10.1130/0091-7613(1993)021<0913:GCOPRA>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 MailTo Tools Icon Tools Get Permissions Search Site Citation Virginia B. Sisson, Terry L. Pavlis; Geologic consequences of plate reorganization: An example from the Eocene southern Alaska fore arc. Geology 1993;; 21 (10): 913–916. doi: https://doi.org/10.1130/0091-7613(1993)021<0913:GCOPRA>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 Observation of relative timing of deformation, metamorphism, and plutonism in a high-temperature-low-pressure metamorphic belt in the eastern Chugach Mountains of Alaska leads to a model of ridge subduction followed by plate reorganization to account for the abnormally high geothermal gradients in the fore arc. Between 56 and 53 Ma, a change in the direction of the Kula-Farallon spreading halted the previous southward migration of the Kula-Farallon-North American triple junction. This forced the triple junction to migrate back north along the plate margin, enlarging the slab window beneath the accretionary margin. The expanded slab window produced a large-scale thermal manifestation now recognized as the Chugach metamorphic complex. The accretionary complex responded to plate reorganization by orogen-parallel extension associated with oblique subduction of the Kula plate. Contraction began again following passage of the triple junction and subduction of the Farallon plate. 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.
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