Strain-collapsed metamorphic isograds in a sillimanite gneiss dome, Seward Peninsula, Alaska

Research Article| June 01, 1992 Strain-collapsed metamorphic isograds in a sillimanite gneiss dome, Seward Peninsula, Alaska E. L. Miller; E. L. Miller 1Department of Geology, Stanford University, Stanford, California 94301 Search for other works by this author on: GSW Google Scholar A. T. Calvert; A. T. Calvert 1Department of Geology, Stanford University, Stanford, California 94301 Search for other works by this author on: GSW Google Scholar T. A. Little T. A. Little 1Department of Geology, Stanford University, Stanford, California 94301 Search for other works by this author on: GSW Google Scholar Geology (1992) 20 (6): 487–490. https://doi.org/10.1130/0091-7613(1992)020<0487:SCMIIA>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 E. L. Miller, A. T. Calvert, T. A. Little; Strain-collapsed metamorphic isograds in a sillimanite gneiss dome, Seward Peninsula, Alaska. Geology 1992;; 20 (6): 487–490. doi: https://doi.org/10.1130/0091-7613(1992)020<0487:SCMIIA>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 Unusually closely spaced Barrovian series isograds have been described along the flanks of the Kigluaik Mountains, Seward Peninsula, Alaska, where they separate a high-grade gneiss complex intruded by granites of Cretaceous age from surrounding, regionally developed, blueschist to greenschist facies rocks. Structural mapping of the transition zone between the two metamorphic types indicates that their juxtaposition was aided by significant syn- to late- metamorphic solid-state flow that served to attenuate the overlying rock column and thus collapse the field metamorphic gradient. On the basis of field relations, structural data, petrography, and geochronologic data, strain appears to have accompanied the rapid (adiabatic) rise of high-temperature rocks from several tens of kilometres to less than 10 km depth during the Cretaceous, in an event younger than and unrelated to high-P metamorphism. Granite-cored gneiss domes on the Seward Peninsula may have formed during extension of previously thickened continental crust, resulting in the ∼35-km-thick crust and near-sea-level elevations of the region today. 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.