Tectonic and geochronological implications of variably timed magnetizations carried by authigenic greigite in marine sediments from New Zealand

Abstract

Research Article| July 01, 2005 Tectonic and geochronological implications of variably timed magnetizations carried by authigenic greigite in marine sediments from New Zealand Christopher J. Rowan; Christopher J. Rowan 1Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK Search for other works by this author on: GSW Google Scholar Andrew P. Roberts Andrew P. Roberts 1Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK Search for other works by this author on: GSW Google Scholar Geology (2005) 33 (7): 553–556. https://doi.org/10.1130/G21382.1 Article history received: 28 Nov 2004 rev-recd: 17 Jan 2005 accepted: 22 Jan 2005 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Christopher J. Rowan, Andrew P. Roberts; Tectonic and geochronological implications of variably timed magnetizations carried by authigenic greigite in marine sediments from New Zealand. Geology 2005;; 33 (7): 553–556. doi: https://doi.org/10.1130/G21382.1 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 Detailed scanning electron microscope observations, coupled with elemental microanalysis, confirm the presence of a chemical remanent magnetization carried by authigenic greigite (Fe3S4) in uplifted Neogene marine sediments from the Hikurangi Margin of New Zealand. Normal polarity samples from the studied section have declinations that are deflected ∼60° clockwise of reversed polarity samples, indicating the presence of two distinct magnetizations separated by several million years of tectonic rotation about a vertical axis. However, although multiple generations of iron sulfide growth are observed petrographically, we see no clear differences in the relative timing of greigite formation between samples carrying these two magnetizations. Not only can the diagenetic growth of greigite in fine-grained marine sediments occur long after deposition, obscuring tectonic and magnetostratigraphic information, but such remagnetizations are also difficult to distinguish from a more primary signal in the absence of constraints from field tests. Our observations emphasize that considerable care is necessary when interpreting paleomagnetic data from greigite-bearing sediments. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.