Evidence of hydrothermal fluid circulation driving elemental mass redistribution in an active fault zone

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dc.contributor.authorDorsey, Matthew T.
dc.contributor.authorRockwell, Thomas K.
dc.contributor.authorGirty, Gary H.
dc.contributor.authorOstermeijer, Giles A.
dc.contributor.authorBrowning, John
dc.contributor.authorMitchell, Thomas M.
dc.contributor.authorFletcher, John M.
dc.date.accessioned2025-01-20T23:53:23Z
dc.date.available2025-01-20T23:53:23Z
dc.date.issued2021
dc.description.abstractImportant fault zone processes can be discerned from the characterization of fracture damage and chemical transformations associated with active seismic sources. To characterize the 2010 M7.2 El Mayor-Cucapah rupture zone, continuous samples of fault core and 23 samples of damaged rock were collected perpendicular to strike of the Borrego fault. Samples were analyzed for clay mineralogy, bulk geochemistry, and bulk and grain density from which porosities and volumetric strains were derived. Prior to the Borrego fault forming, the tonalitic pmtolith, containing chlorite, epidote, and titanite, was subjected to temperatures of similar to 330-340 degrees C during deuteric alteration. Rocks within the damage zone are partially pulverized and contain abundant cataclastic seams. Porosity and volumetric strain peak in zones 1.5 m-10.5 m from the core. Within these zones, losses in Ca and P mass, increases in Mg and Na mass, along with the conservation of Fe and Si mass are consistent with oxidizing acidic conditions at < 200 degrees C. Gains in LOI are attributed to increases in clay content. The above data support a model of Mg- and Na-rich oxidizing fluid circulation within the damage zone of the Borrego fault.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.jsg.2020.104269
dc.identifier.eissn1873-1201
dc.identifier.issn0191-8141
dc.identifier.urihttps://doi.org/10.1016/j.jsg.2020.104269
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94960
dc.identifier.wosidWOS:000620101500001
dc.language.isoen
dc.revistaJournal of structural geology
dc.rightsacceso restringido
dc.subjectHydrothermal alteration
dc.subjectElemental mass redistribution
dc.subjectFault zone architecture
dc.subjectDamage zone
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleEvidence of hydrothermal fluid circulation driving elemental mass redistribution in an active fault zone
dc.typeartículo
dc.volumen144
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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