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Anisotropic magnetite growth in remagnetized limestones: Tectonic constraints and implications for basin history

2018; Geological Society of America; Volume: 46; Issue: 9 Linguagem: Inglês

10.1130/g45158.1

1943-2682

Pablo Calvín, Juan José Villalaín, Antonio María Casas Sáinz,

earthquake and tectonic studies

Research Article| July 19, 2018 Anisotropic magnetite growth in remagnetized limestones: Tectonic constraints and implications for basin history Pablo Calvín; Pablo Calvín 1Departamento de Física, Universidad de Burgos, Av/ Cantabria s/n, 9006 Burgos, Spain Search for other works by this author on: GSW Google Scholar Juan J. Villalaín; Juan J. Villalaín 1Departamento de Física, Universidad de Burgos, Av/ Cantabria s/n, 9006 Burgos, Spain Search for other works by this author on: GSW Google Scholar Antonio M. Casas-Sainz Antonio M. Casas-Sainz 2Geotransfer Research Group (IUCA), Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain Search for other works by this author on: GSW Google Scholar Author and Article Information Pablo Calvín 1Departamento de Física, Universidad de Burgos, Av/ Cantabria s/n, 9006 Burgos, Spain Juan J. Villalaín 1Departamento de Física, Universidad de Burgos, Av/ Cantabria s/n, 9006 Burgos, Spain Antonio M. Casas-Sainz 2Geotransfer Research Group (IUCA), Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain Publisher: Geological Society of America Received: 17 May 2018 Revision Received: 10 Jul 2018 Accepted: 12 Jul 2018 First Online: 19 Jul 2018 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2018 Geological Society of America Geology (2018) 46 (9): 751–754. https://doi.org/10.1130/G45158.1 Article history Received: 17 May 2018 Revision Received: 10 Jul 2018 Accepted: 12 Jul 2018 First Online: 19 Jul 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Pablo Calvín, Juan J. Villalaín, Antonio M. Casas-Sainz; Anisotropic magnetite growth in remagnetized limestones: Tectonic constraints and implications for basin history. Geology 2018;; 46 (9): 751–754. doi: https://doi.org/10.1130/G45158.1 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 Magnetic properties of sedimentary rocks have been commonly exploited to determine the tectonic and chemical evolution of sedimentary basins. We here propose the use of the anisotropy of the anhysteretic remanent magnetization (ARM) to infer the orientation of magnetite grains formed during remagnetization stages, and hence to obtain the tectonic regime during the magnetization period, whose age can also be constrained by paleomagnetic methods. The anisotropy of ARM technique is here applied to remagnetized Jurassic limestones from the Central High Atlas (North Africa). These rocks were remagnetized at ca. 100 Ma during the Cretaceous Normal Superchron in an extensional tectonic setting. The magnetic fabric carried by authigenic magnetite (which is also the carrier of the remagnetization) shows a consistent orientation after a partial bedding correction, which precisely corresponds with the attitude of strata at the time of remagnetization. The anisotropy of the ARM tensor shows a well-defined horizontal lineation parallel to the Mesozoic regional extension, and a horizontal magnetic foliation perpendicular to the lithostatic maximum stress axis. Therefore, our results demonstrate that (1) the magnetite grain growth was consistent with the stress conditions and did not follow any preexisting fabric of the rock, and (2) these grains did not rotate during the subsequent compressional events. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.