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Cited by 5 publications
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“…Cooling history can also affect the observed Curie temperature (T c ) in some titanomagnetites due to cation reordering (Bowles et al, 2013), which can complicate paleointensity studies (Bowles et al, 2015). Moreover, postemplacement alteration may result in magnetizations that are not pure TRM, but instead are thermochemical remanent magnetization (TCRM; Perrin et al, 2013). In the interiors of cooling thick tuff deposits, water vapor is released during devitrification and is sometimes supplemented with meteoric water, providing a system for redistributing constituents and forming new minerals including magnetic oxides (Vaniman, 2006).…”
Section: Citationmentioning
confidence: 99%
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“…Cooling history can also affect the observed Curie temperature (T c ) in some titanomagnetites due to cation reordering (Bowles et al, 2013), which can complicate paleointensity studies (Bowles et al, 2015). Moreover, postemplacement alteration may result in magnetizations that are not pure TRM, but instead are thermochemical remanent magnetization (TCRM; Perrin et al, 2013). In the interiors of cooling thick tuff deposits, water vapor is released during devitrification and is sometimes supplemented with meteoric water, providing a system for redistributing constituents and forming new minerals including magnetic oxides (Vaniman, 2006).…”
Section: Citationmentioning
confidence: 99%
“…Despite the successful recovery of historical field values from recent ignimbrite deposits, there is evidence that ignimbrites may not all be suitable for paleointensity studies without thoroughly examining the nature of the remanence (whether thermal, chemical, or a mixture). Recent studies have sampled ignimbrite of varying density (Gee et al, ), sampled whole rock and glass from welded tuffs (Mochizuki et al, ), and sampled both extrusive lava and ignimbrite (Perrin et al, ) to test the consistency of their paleointensity estimates. Both Mochizuki et al () and Perrin et al () observed Arai plots from ignimbrites that passed their selection criteria but which produced inexplicably high or low paleofield estimates.…”
Section: Introductionmentioning
confidence: 99%
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“…Shaw-type experiments on 5-500 ka pyroclastic deposits from Unzen volcano, Japan, [Yamamoto et al, 2010] yielded six sites with internally consistent results and another four with more variable results. Perrin et al [2013] worked with 20.4-31.0 Ma rhyolitic ignimbrites, and in this case Thellier-type paleointensity experiments produced results of high technical quality, but with no internal consistency. Combined with the presence of maghemite and hematite, the authors concluded that these results were unreliable and that hydrothermal alteration had affected the magnetization.…”
Section: Introductionmentioning
confidence: 99%
“…Perrin et al . [] worked with 20.4–31.0 Ma rhyolitic ignimbrites, and in this case Thellier‐type paleointensity experiments produced results of high technical quality, but with no internal consistency. Combined with the presence of maghemite and hematite, the authors concluded that these results were unreliable and that hydrothermal alteration had affected the magnetization.…”
Section: Introductionmentioning
confidence: 99%