Coseismic recrystallization during shallow earthquake slip
DC Field | Value | Language |
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dc.contributor.author | Smith, S. A. F. | - |
dc.contributor.author | Di Toro, G. | - |
dc.contributor.author | Kim, S. | - |
dc.contributor.author | Ree, J-H. | - |
dc.contributor.author | Nielsen, S. | - |
dc.contributor.author | Billi, A. | - |
dc.contributor.author | Spiess, R. | - |
dc.date.accessioned | 2021-09-06T05:39:11Z | - |
dc.date.available | 2021-09-06T05:39:11Z | - |
dc.date.created | 2021-06-14 | - |
dc.date.issued | 2013-01 | - |
dc.identifier.issn | 0091-7613 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/104297 | - |
dc.description.abstract | Solidified frictional melts, or pseudotachylytes, remain the only unambiguous indicator of seismic slip in the geological record. However, pseudotachylytes form at >5 km depth, and there are many rock types in which they do not form at all. We performed low- to high-velocity rock friction experiments designed to impose realistic coseismic slip pulses on calcite fault gouges, and report that localized dynamic recrystallization may be an easy-to-recognize microstructural indicator of seismic slip in shallow, otherwise brittle fault zones. Calcite gouges with starting grain size <250 mu m were confined up to 26 MPa normal stress using a purpose-built sample holder. Slip velocities were between 0.01 and 3.4 m s(-1), and total displacements between 1 and 4 m. At coseismic slip velocities >= 0.1 m s(-1), the gouges were cut by reflective principal slip surfaces lined by polygonal grains <1 mu pm in size. The principal slip surfaces were flanked by <300 mu m thick layers of dynamically recrystallized calcite (grain size 1-10 mu m) containing well-defined shape- and crystallographic-preferred orientations. Dynamic recrystallization was accompanied by fault weakening and thermal decomposition of calcite to CO2 + CaO. The recrystallized calcite aggregates resemble those found along the principal slip surface of the Garam thrust, South Korea, exhumed from <5 km depth. We suggest that intense frictional heating along the experimental and natural principal slip surfaces resulted in localized dynamic recrystallization, a microstructure that may be diagnostic of seismic slip in the shallow crust. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | GEOLOGICAL SOC AMER, INC | - |
dc.subject | THERMAL-DECOMPOSITION | - |
dc.subject | SEISMIC SLIP | - |
dc.subject | PSEUDOTACHYLYTE | - |
dc.subject | FRICTION | - |
dc.subject | FAULTS | - |
dc.subject | DEFORMATION | - |
dc.subject | GENERATION | - |
dc.subject | BEHAVIOR | - |
dc.subject | GOUGE | - |
dc.subject | MELT | - |
dc.title | Coseismic recrystallization during shallow earthquake slip | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Ree, J-H. | - |
dc.identifier.doi | 10.1130/G33588.1 | - |
dc.identifier.scopusid | 2-s2.0-84872165734 | - |
dc.identifier.wosid | 000313026200016 | - |
dc.identifier.bibliographicCitation | GEOLOGY, v.41, no.1, pp.63 - 66 | - |
dc.relation.isPartOf | GEOLOGY | - |
dc.citation.title | GEOLOGY | - |
dc.citation.volume | 41 | - |
dc.citation.number | 1 | - |
dc.citation.startPage | 63 | - |
dc.citation.endPage | 66 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Geology | - |
dc.relation.journalWebOfScienceCategory | Geology | - |
dc.subject.keywordPlus | THERMAL-DECOMPOSITION | - |
dc.subject.keywordPlus | SEISMIC SLIP | - |
dc.subject.keywordPlus | PSEUDOTACHYLYTE | - |
dc.subject.keywordPlus | FRICTION | - |
dc.subject.keywordPlus | FAULTS | - |
dc.subject.keywordPlus | DEFORMATION | - |
dc.subject.keywordPlus | GENERATION | - |
dc.subject.keywordPlus | BEHAVIOR | - |
dc.subject.keywordPlus | GOUGE | - |
dc.subject.keywordPlus | MELT | - |
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