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Latest Cretaceous cone-in-cone structures and soft-sediment deformation (Basque-Cantabrian Basin, north Spain): A record of deep-marine paleoseismicity?

2010; Geological Society of America; Volume: 123; Issue: 3-4 Linguagem: Inglês

10.1130/b30047.1

1943-2674

B. Ábalos, Javier Elorza,

earthquake and tectonic studies

Research Article| March 01, 2011 Latest Cretaceous cone-in-cone structures and soft-sediment deformation (Basque-Cantabrian Basin, north Spain): A record of deep-marine paleoseismicity? B. Ábalos; B. Ábalos † 1Departamento de Geodinámica, Universidad del País Vasco, P.O. Box 644, E-48080 Bilbao, Spain †E-mail: benito.abalos@ehu.es Search for other works by this author on: GSW Google Scholar J. Elorza J. Elorza 2Departamento de Mineralogía y Petrología, Universidad del País Vasco, P.O. Box 644, E-48080 Bilbao, Spain Search for other works by this author on: GSW Google Scholar Author and Article Information B. Ábalos † 1Departamento de Geodinámica, Universidad del País Vasco, P.O. Box 644, E-48080 Bilbao, Spain J. Elorza 2Departamento de Mineralogía y Petrología, Universidad del País Vasco, P.O. Box 644, E-48080 Bilbao, Spain †E-mail: benito.abalos@ehu.es Publisher: Geological Society of America Received: 03 Mar 2009 Revision Received: 10 Nov 2009 Accepted: 16 Nov 2009 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2011 Geological Society of America GSA Bulletin (2011) 123 (3-4): 427–438. https://doi.org/10.1130/B30047.1 Article history Received: 03 Mar 2009 Revision Received: 10 Nov 2009 Accepted: 16 Nov 2009 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation B. Ábalos, J. Elorza; Latest Cretaceous cone-in-cone structures and soft-sediment deformation (Basque-Cantabrian Basin, north Spain): A record of deep-marine paleoseismicity?. GSA Bulletin 2011;; 123 (3-4): 427–438. doi: https://doi.org/10.1130/B30047.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Unusual cone-in-cone structures are preserved in fibrous celestite veins hosted by carbonatic rocks. The veins are early diagenetic features formed near the water-sediment interface in a deep-marine environment of latest Cretaceous (early Maastrichtian) age. New field and microscopic evidence on the veins and their host rocks indicates that they predate sediment compaction and were related to synsedimentary, soft-sediment deformation structures. The mechanism of cone-in-cone formation has been related to fluid-pressure drops following sediment overpressurization, but instantaneous loading during emplacement of submarine slides or other mechanisms might be viable alternatives. We argue that this cone-in-cone structure is an overprinting feature (penetrative conical fractures) that resulted from seismic wave propagation through a mechanically anisotropic medium. Submarine amplification of seismic surface waves (Rayleigh waves) induced shock wave formation in the contacts between veins and the bounding lithified calcarenite and unlithified marl sediment layers. Fracture front wave propagation (normal to the seafloor and the Rayleigh source) across the veins and along the celestite crystal fibers induced crack nucleation in heterogeneities and penetrative conical fracturation. The cone-in-cone structure might thus be regarded as a new paleoseismological indicator in deep-sea sediments. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.