A Permian Disturbance of K-Ar Radiometric Ages in New England: Its Occurrence and Cause

Abstract

Research Article| November 01, 1970 A Permian Disturbance of K-Ar Radiometric Ages in New England: Its Occurrence and Cause ROBERT E ZARTMAN; ROBERT E ZARTMAN U.S. Geological Survey, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar PATRICK M HURLEY; PATRICK M HURLEY Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Search for other works by this author on: GSW Google Scholar HAROLD W KRUEGER; HAROLD W KRUEGER Geochron Laboratories, Inc., Cambridge, Massachusetts 02139 Search for other works by this author on: GSW Google Scholar BRUNO J GILETTI BRUNO J GILETTI Brown University, Providence, Rhode Island 02912 Search for other works by this author on: GSW Google Scholar Author and Article Information ROBERT E ZARTMAN U.S. Geological Survey, Denver, Colorado 80225 PATRICK M HURLEY Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 HAROLD W KRUEGER Geochron Laboratories, Inc., Cambridge, Massachusetts 02139 BRUNO J GILETTI Brown University, Providence, Rhode Island 02912 Publisher: Geological Society of America Received: 23 Oct 1969 Revision Received: 15 Jun 1970 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1970, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1970) 81 (11): 3359–3374. https://doi.org/10.1130/0016-7606(1970)81[3359:APDOKR]2.0.CO;2 Article history Received: 23 Oct 1969 Revision Received: 15 Jun 1970 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation ROBERT E ZARTMAN, PATRICK M HURLEY, HAROLD W KRUEGER, BRUNO J GILETTI; A Permian Disturbance of K-Ar Radiometric Ages in New England: Its Occurrence and Cause. GSA Bulletin 1970;; 81 (11): 3359–3374. doi: https://doi.org/10.1130/0016-7606(1970)81[3359:APDOKR]2.0.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 SocietyGSA Bulletin Search Advanced Search Abstract Approximately 200 K-Ar mineral and whole rock ages from New England, half of which are previously unpublished, are used to delineate an area of Permian thermal disturbance. The disturbed area, as outlined by K-Ar mica ages, forms a north-northeast-trending belt 60–80 mi wide that extends from the coast of Long Island Sound in southern Connecticut to southwestern Maine, where it terminates against rocks displaying older radiometric ages. Several possible mechanisms that may have affected the radio-metric systems of pre-existing rocks are examined: (1) contact metamorphism related to contemporaneous igneous activity, (2) alteration associated with major faulting, (3) regional metamorphism in late Paleozoic time, and (4) burial followed by uplift and erosion. Evidence is given that each of these mechanisms was operative locally, especially in the southern portion of the belt. The general lack of late Paleozoic tectonism in New Hampshire and Maine suggests that only burial is a likely cause of the disturbance there. 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.