Crystal-melt elemental partitioning in silicic magmatic systems: An example from the Peach Spring Tuff high-silica rhyolite, Southwest USA

Padilla, A. J.; Gualda, G. A.

doi:10.1016/j.chemgeo.2016.07.004

Cited by 61 publications

(39 citation statements)

References 63 publications

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“…Another well-established feature of the TTGs is that they have steep heavy REE patterns and elevated Sr/Y ratios (>10) indicative of an important role for garnet either during partial melting or crystal fractionation 27 . REE partitioning into garnet is well constrained and ratios of the partition coefficients for the heavy REE (which are highly compatible in zircon) appear particularly robust 22,28 . Thus, a second striking result of our investigation is that the inferred Jack Hills protoliths had flat REE patterns and so their Dy/Yb ratios do not overlap the TTG field on Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Black circles assume experimental zircon/melt partition coefficients 22 . For comparison, the grey circles assume empirical zircon/ melt partition coefficients 28 . Also shown are the composition of Sudbury rocks (white squares) inferred to have formed from impact-induced melting 44 and the TTG field for trondhjemite-tonalite-granodiorite suites (data compilation from GEOROC).…”

Section: Discussionmentioning

confidence: 99%

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An andesitic source for Jack Hills zircon supports onset of plate tectonics in the Hadean

et al. 2020

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The composition and origin of Earth's early crust remains hotly debated. Here we use partition coefficients to invert the trace element composition of 4.3-3.3 Gyr Jack Hills zircons to calculate the composition of the melts from which they crystallised. Using this approach, the average SiO 2 content of these melts was 59 ± 6 wt. % with Th/Nb, Dy/Yb and Sr/Y ratios of 2.7 ± 1.9, 0.9 ± 0.2 and 1.6 ± 0.7, respectively. Such features strongly indicate that the protolith for the Jack Hills zircons was not an intra-plate mafic rock, nor a TTG (tondjhemitetonalite-granodiorite) or a Sudbury-like impact melt. Instead, the inferred equilibrium melts are much more similar to andesites formed in modern subduction settings. We find no evidence for any secular variation between 4.3 and 3.3 Gyr implying little change in the composition or tectonic affinity of the Earth's early crust from the Hadean to Mesoarchaean.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

An andesitic source for Jack Hills zircon supports onset of plate tectonics in the Hadean

et al. 2020

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“…The whole-rock REE compositions of both quartz diorite and granodiorite compare most favorably with the melt compositions calculated from the Padilla and Gualda (2016) distribution coefficients. This suggests that distribution coefficients determined by measurements of mineral rim and glass compositions (reflecting fractional crystallization) may be more appropriate for evaluating natural rocks, such as those at Russian Peak, than experimentally determined distribution coefficients (representing equilibrium crystallization).…”

Section: Rare-earth Element Compositions Of Meltsmentioning

confidence: 60%

“…The REE compositions of melts in equilibrium with constituent amphiboles have been calculated by us-ing the partition coefficients for amphibole reported by Nandedkar et al (2016) and Padilla and Gualda (2016); partition coefficients in the former investigation were determined experimentally at 7 kbar and 1010-730 ºC for rock types ranging from basaltic andesite (51 wt. % SiO 2 ) to rhyolite (68 wt.…”

Section: Rare-earth Element Compositions Of Meltsmentioning

confidence: 99%

“…values listed in parentheses. Rare-earth element compositions of melts in equilibrium with constituent amphiboles are shown by gray fields for QD and GD and long dashes for GD, when calculated with the bulk distribution coefficients (D-values) of Nandedkar et al (2016), and by stippled fields for QD and GD and short dashes for GD, when calculated with the D-values of Padilla and Gualda (2016). The fields and dashed lines for granodiorite illustrate the results for the two amphibole populations in each sample.…”

Section: Rare-earth Element Compositions Of Meltsmentioning

confidence: 99%

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Petrogenetic evolution of a Late Jurassic calc-alkaline plutonic complex, Klamath Mountains Province, U.S.A.: quantification by major- and trace-element modelling

Medaris¹,

Svojtka²,

Ackerman³

et al. 2019

J. Geosci.

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This investigation illustrates the use of major and trace elements to evaluate the petrogenetic evolution of the Late Jurassic Russian Peak Plutonic Complex in the Klamath Mountains Province, northern California, U.S.A. The two principal plutons in the complex consist of quartz diorite and granodiorite, both of which were most likely derived by partial melting of amphibolitic oceanic crustal sources and ultimately emplaced at a shallow level of ~10 km (P total ~ 3 kbar). The major-element compositional variations in quartz diorite are consistent with crystallization of plagioclase (45 %) and amphibole (69 %) and resorption of clinopyroxene (-14 %). Major-element variations in granodiorite could have resulted from crystallization of plagioclase (60 %), amphibole (26 %), and biotite (14 %). Trace elements in whole-rocks and amphibole record different degrees of fractional crystallization, whole-rocks reflecting differentiation on a plutonic scale, and amphibole crystals reflecting differentiation on the scale of an individual sample. Quartz diorite experienced 10% fractional crystallization for the suite as a whole and 45% for individual samples; in contrast, granodiorite experienced 40% crystallization for the suite and 80% for individual samples. For both quartz diorite and granodiorite, comparisons of whole-rock REE patterns with those for melts calculated to be in equilibrium with amphibole demonstrate that the whole-rock REE compositions represent a combination of crystals and melts from evolving magmas, rather than melts alone.

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Zircon as Magma Monitor

Claiborne

Miller

Gualda

et al. 2017

Geophysical Monograph Series

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Crystal-melt elemental partitioning in silicic magmatic systems: An example from the Peach Spring Tuff high-silica rhyolite, Southwest USA

Cited by 61 publications

References 63 publications

An andesitic source for Jack Hills zircon supports onset of plate tectonics in the Hadean

An andesitic source for Jack Hills zircon supports onset of plate tectonics in the Hadean

Petrogenetic evolution of a Late Jurassic calc-alkaline plutonic complex, Klamath Mountains Province, U.S.A.: quantification by major- and trace-element modelling

Zircon as Magma Monitor

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