DOI: 10.1007/s00531-013-0956-7
Scopus记录号: 2-s2.0-84893780567
论文题名: Fault gouge analyses: K-Ar illite dating, clay mineralogy and tectonic significance-a study from the Sierras Pampeanas, Argentina
作者: Bense F.A. ; Wemmer K. ; Löbens S. ; Siegesmund S.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 1 起始页码: 189
结束页码: 218
语种: 英语
英文关键词: Brittle faulting
; Fault gouge dating
; Illite
; K-Ar
; Low-temperature thermochronology
; Paleostress
; Polytypism
; Sierras Pampeanas
Scopus关键词: age determination
; brittle deformation
; Devonian
; extensional tectonics
; fault gouge
; grain size
; host rock
; illite
; Jurassic-Cretaceous boundary
; mineralogy
; paleostress
; potassium-argon dating
; tectonic evolution
; thermochronology
; Argentina
; San Luis
; Sierras de Cordoba
; Sierras Pampeanas
英文摘要: We introduce a method for the detailed interpretation of K-Ar illite fine-fraction ages of fault gouges from non-sedimentary host rocks. Ages are cross-evaluated with several independent parameters, e.g. illite crystallinity, illite polytype quantification, grain size, mineralogical observations, K-Ar muscovite and biotite host-rock cooling ages as well as low-temperature thermochronological data (AFT, AHe, ZHe). This interpretation approach is applied to a regional study in order to constrain the 'deformation path' of the Eastern Sierras Pampeanas in NW Argentina. In the course of this study, a large number of gouge-bearing fault zones were systematically sampled and analysed. Obtained K-Ar illite fine-fraction ages range from Devonian to Cretaceous times, documenting a long-lasting brittle fault activity in this region. Ages >320 Ma are synchronous with a period of intra-Carboniferous compressional tectonism, whereas Permo-Triassic ages are contemporaneous to a flat-slab subduction episode of the Farallon plate beneath the South American plate. Middle to Late Permian and Early Triassic ages as well as Early Jurassic to Middle Cretaceous ages correlate with extensional tectonics in this region. Additionally, K-Ar illite ages reveal a propagation of brittle deformation from north to south in the Sierras de Córdoba and San Luis. Data integrity and consistency with other chronometers and geological evidence show that the here suggested interpretation is valid and can provide a powerful tool to evaluate cooling and deformation histories. Despite of that, we could show that the reliability of fault gouge data strongly depends on the regional cooling. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893780567&doi=10.1007%2fs00531-013-0956-7&partnerID=40&md5=6a04819fa3e45f02a096ee6d1238581d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70441
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Geoscience Centre, University of Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany
Recommended Citation:
Bense F.A.,Wemmer K.,Löbens S.,et al. Fault gouge analyses: K-Ar illite dating, clay mineralogy and tectonic significance-a study from the Sierras Pampeanas, Argentina[J]. International Journal of Earth Sciences,2014-01-01,103(1)