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Remanence resetting by shock-induced thixotropy in the Seminary Till, Scarborough, Ontario, Canada

1980; Geological Society of America; Volume: 91; Issue: 10 Linguagem: Inglês

10.1130/0016-7606(1980)91 2.0.co;2

1943-2674

D. T. A. Symons, M. Stupavsky, C. P. Gravenor,

Geological and Geochemical Analysis

Research Article| October 01, 1980 Remanence resetting by shock-induced thixotropy in the Seminary Till, Scarborough, Ontario, Canada D.T.A. SYMONS; D.T.A. SYMONS 1Department of Geology, University of Windsor, Windsor, Ontario N9B 3P4, Canada Search for other works by this author on: GSW Google Scholar M. STUPAVSKY; M. STUPAVSKY 1Department of Geology, University of Windsor, Windsor, Ontario N9B 3P4, Canada Search for other works by this author on: GSW Google Scholar C. P. GRAVENOR C. P. GRAVENOR 1Department of Geology, University of Windsor, Windsor, Ontario N9B 3P4, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information D.T.A. SYMONS 1Department of Geology, University of Windsor, Windsor, Ontario N9B 3P4, Canada M. STUPAVSKY 1Department of Geology, University of Windsor, Windsor, Ontario N9B 3P4, Canada C. P. GRAVENOR 1Department of Geology, University of Windsor, Windsor, Ontario N9B 3P4, Canada Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1980) 91 (10): 593–598. https://doi.org/10.1130/0016-7606(1980)91 2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation D.T.A. SYMONS, M. STUPAVSKY, C. P. GRAVENOR; Remanence resetting by shock-induced thixotropy in the Seminary Till, Scarborough, Ontario, Canada. GSA Bulletin 1980;; 91 (10): 593–598. doi: https://doi.org/10.1130/0016-7606(1980)91 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 The paleomagnetic reliability of the remanent magnetism of the Pleistocene Seminary Till is examined. The lack of correlation in remanence direction between two profiles 0.7 m apart in the till, as well as the large within-core variation of 13° between specimen pairs, suggests the possibility that the sampling procedures cause significant errors. Laboratory experiments on several kinds of un-consolidated glacial sediments show significant thixotropic remanence resetting toward the ambient magnetic field caused by hammer shocks during sampling. Significantly different and significantly higher precision results are obtained from cores that have been drilled by diamond bit from oriented blocks of till than are obtained by driving polycarbonate plastic tubes into the till. Plastic-tube cores also have a distorted magnetic fabric caused by flow deformation. The six tills studied to date in Ontario, including the Seminary Till, yield far-sided pole positions reflecting an average 13° shallowing of the remanence inclination. For normally polarized till, the primary DRM inclination error substantially exceeds 13° but is reduced to this figure by secondary thixotropic resetting. For reversely polarized till, the primary DRM inclination error is further increased by the addition of the resetting error. 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.