Towards the definition of AMS facies in the deposits of pyroclastic density currents

Abstract Anisotropy of magnetic susceptibility (AMS) provides a statistically robust technique to characterize the fabrics of deposits of pyroclastic density currents (PDCs). AMS fabrics in two types of pyroclastic deposits (small-volume phreatomagmatic currents in the Hopi Buttes volcanic field, Ar...

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Autor principal: Ort, M.H
Otros Autores: Newkirk, T.T, Vilas, J.F, Vazquez, J.A
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Publicado: Geological Society of London 2015
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100 1 |a Ort, M.H. 
245 1 0 |a Towards the definition of AMS facies in the deposits of pyroclastic density currents 
260 |b Geological Society of London  |c 2015 
270 1 0 |m Ort, M.H.; SESES, Northern Arizona University, Box 4099, United States 
506 |2 openaire  |e Política editorial 
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520 3 |a Abstract Anisotropy of magnetic susceptibility (AMS) provides a statistically robust technique to characterize the fabrics of deposits of pyroclastic density currents (PDCs). AMS fabrics in two types of pyroclastic deposits (small-volume phreatomagmatic currents in the Hopi Buttes volcanic field, Arizona, USA, and large-volume caldera-forming currents, Caviahue Caldera, Neuquén, Argentina) show similar patterns. Near the vent and in areas of high topographical roughness, AMS depositional fabrics are poorly grouped, with weak lineations and foliations. In a densely welded proximal ignimbrite, this fabric is overprinted by a foliation formed as the rock compacted and deformed. Medial deposits have moderate-strong AMS lineations and foliations. The most distal deposits have strong foliations but weak lineations. Based on these facies and existing models for pyroclastic density currents, deposition in the medial areas occurs from the strongly sheared, high-particle-concentration base of a density-stratified current. In proximal areas and where topography mixes this denser base upwards into the current, deposition occurs rapidly from a current with little uniformity to the shear, in which particles fall and collide in a chaotic fashion. Distal deposits are emplaced by a slowing or stalled current so that the dominant particle motion is vertical, leading to weak lineation and strong foliation. © 2015 The Geological Society of London.  |l eng 
593 |a SESES, Northern Arizona University, Box 4099, Flagstaff, AZ 86011, United States 
593 |a Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, 00-07 Main Mall, Vancouver, BC V6T 1Z4, Canada 
593 |a Departamento de Geología, Instituto de Geofísica Daniel A. Valencio, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, Buenos Aires, C1428EHA, Argentina 
593 |a United States Geological Survey, 35 Middlefield Road, MS910, Menlo Park, CA 94025, United States 
690 1 0 |a DENSITY CURRENT 
690 1 0 |a FACIES ANALYSIS 
690 1 0 |a IGNIMBRITE 
690 1 0 |a MAGNETIC ANISOTROPY 
690 1 0 |a MAGNETIC FABRIC 
690 1 0 |a PYROCLASTIC DEPOSIT 
700 1 |a Newkirk, T.T. 
700 1 |a Vilas, J.F. 
700 1 |a Vazquez, J.A. 
773 0 |d Geological Society of London, 2015  |g v. 396  |h pp. 205-226  |p Geol. Soc. Spec. Publ.  |x 03058719  |t Geological Society Special Publication 
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856 4 0 |u https://doi.org/10.1144/SP396.8  |y DOI 
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