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dc.contributor.authorSchmitt, Axel K.
dc.contributor.authorDanišík, Martin
dc.contributor.authorMartin, Noreen J.
dc.contributor.authorSiebel, Wolfgang
dc.contributor.authorKiemele, Elena
dc.contributor.authorAydin, Faruk
dc.contributor.authorHarvey, Janet C.
dc.date.accessioned2011-08-12T03:33:38Z
dc.date.available2011-08-12T03:33:38Z
dc.date.issued2011
dc.identifier.citationSchmitt, A.K., Danišík, M., Evans, N.J., Siebel, W., Kiemele, E., Aydin, F. & Harvey, J.C. (2011). Acigöl rhyolite field, Central Anatolia (part 1): high-resolution dating of eruption episodes and zircon growth rates. Contributions to Mineralogy and Petrology, available online 24 May 2011.en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/5574
dc.description.abstractProtracted pre-eruptive zircon residence is frequently detected in continental rhyolites and can conflict with thermal models, indicating briefer magma cooling durations if scaled to erupted volumes. Here, we present combined U-Th and (U-Th)/He zircon ages from the Acigöl rhyolite field (Central Anatolia, Turkey), which is part of a Quaternary bimodal volcanic complex. Unlike other geochronometers, this approach dates crystallization and eruption on the same crystals, allowing for internal consistency testing. Despite the overall longevity of Acigöl rhyolite volcanism and systematic trends of progressive depletion in compatible trace elements and decreasing zircon saturation temperatures, we find that zircon crystallized in two brief pulses corresponding to eruptions in the eastern and western part of the field during Middle and Late Pleistocene times, respectively. For Late Pleistocene zircon, resolvable differences exist between interior (average: 30.7 ± 0.9 ka; 1σ error) and rim (21.9 ± 1.3 ka) crystallization ages. These translate into radial crystal growth rates of ∼10⁻¹³ to 10⁻¹⁴ cm/s, broadly consistent with those constrained by diffusion experiments. Rim crystallization and (U-Th)/He eruption ages (24.2 ± 0.4 ka) overlap within uncertainty. Evidence for brief zircon residence at Acigöl contrasts with many other rhyolite fields, suggesting that protracted zircon crystallization in, or recycling from, long-lived crystal mushes is not ubiquitous in continental silicic magma systems. Instead, the span of pre-eruptive zircon ages is consistent with autochthonous crystallization in individual small-volume magma batches that originated from basaltic precursors.en_NZ
dc.language.isoen
dc.publisherSpringeren_NZ
dc.relation.urihttp://www.springerlink.com/content/p3t5164r81616361/en_NZ
dc.subjectZirconen_NZ
dc.subject(U-Th)/Heen_NZ
dc.subjectUranium seriesen_NZ
dc.subjectCalderasen_NZ
dc.subjectRhyolite domesen_NZ
dc.titleAcigöl rhyolite field, Central Anatolia (part 1): high-resolution dating of eruption episodes and zircon growth ratesen_NZ
dc.typeJournal Articleen_NZ
dc.identifier.doi10.1007/s00410-011-0648-xen_NZ
dc.relation.isPartOfContributions to Mineralogy and Petrologyen_NZ
pubs.begin-page1en_NZ
pubs.elements-id36220
pubs.end-page17en_NZ
pubs.issue6en_NZ
pubs.volumeonlineen_NZ


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