Parameterized lattice strain models for REE partitioning between amphibole and silicate melt

Shimizu, K.; Liang, Yan; Sun, Chenguang; Jackson, Colin R.; Saal, A. E.

doi:10.2138/am-2017-6110

Cited by 56 publications

(36 citation statements)

References 98 publications

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“…This equation enables the Nb content of the amphibole equilibrium melt to be calculated, based on knowledge of the amphibole major element composition (because this affects the structure and trace element capacity of different crystallographic sites). The values of D REE calculated using our MR approach are similar to those derived by Shimizu et al (2017) using a lattice strain model. Statistically significant regressions could not be retrieved for several elements including Ba, Cs, Hf, Ta, and Sc, typically because of low concentrations and a paucity of calibration data.…”

Section: Multiple Regression Equationssupporting

confidence: 74%

“…Tetravalent HFSE (Zr 4+ and Hf 4+ ) are incorporated onto M2 by substitution for Ti (Oberti et al, 2000) while Nb and Ta are incorporated preferentially into M1 (Tiepolo et al, 2000b). REE and Y are thought to be partitioned into M4, substituting for either Ca and/or Na (Brenan et al 1995;Klein et al 1997;Hilyard et al 2000;Shimizu et al 2017).…”

Section: Amphibole Structure and Chemistrymentioning

confidence: 99%

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Unravelling the complexity of magma plumbing at Mount St. Helens: a new trace element partitioning scheme for amphibole

Humphreys

Cooper

Zhang

et al. 2019

Contrib Mineral Petrol

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Volcanoes at subduction zones reside above complex magma plumbing systems, where individual magmatic components may originate and interact at a range of pressures. Because whole rock compositions of subduction zone magmas are the integrated result of processes operating throughout the entire plumbing system, processes such as mixing, homogenisation and magma assembly during shallow storage can overprint the chemical signatures of deeper crustal processes. Whereas melt inclusions provide an effective way to study the uppermost 10-15 km of the plumbing system, challenges remain in understanding magma intrusion, fractionation and hybridisation processes in the middle to lower crust (15-30 km depth), which commonly involves amphibole crystallisation. Here, we present new insights into the mid-crustal plumbing system at Mount St Helens, USA, using multiple regression methods to calculate trace element partition coefficients for amphibole 2 phenocrysts, and thus infer the trace element compositions of their equilibrium melts. The results indicate vertically distributed crystal fractionation, dominated by amphibole at higher pressures and in intermediate melts, and by plagioclase at lower pressures. Variations in Nb, Zr and REE concentrations at intermediate SiO 2 contents suggest repeated scavenging of partially remelted intrusive material in the mid-crust, and mixing with material from geochemically diverse sources. Amphibole is an effective probe for deep crustal magmatism worldwide, and this approach offers a new tool to explore the structure and chemistry of arc magmas, including those forming plutonic or cumulate materials that offer no other constraints on melt composition.

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Section: Multiple Regression Equationssupporting

confidence: 74%

Section: Amphibole Structure and Chemistrymentioning

confidence: 99%

Unravelling the complexity of magma plumbing at Mount St. Helens: a new trace element partitioning scheme for amphibole

Humphreys

Cooper

Zhang

et al. 2019

Contrib Mineral Petrol

View full text Add to dashboard Cite

show abstract

“…In the andesitic magma reservoir, the evolution of Eu/Eu* can be constrained by considering clinopyroxene and amphibole compositions, as the clinopyroxenes record near-liquidus temperatures (1023 to 1063 °C), whereas the amphiboles crystallized at near-solidus temperatures (798 to 841 °C). Here, a lattice strain model was used for estimating the mineral/melt partition coefficients of clinopyroxene and amphibole (Blundy and Wood 1994), for which the lattice strain parameters were obtained by parameterized models based on mineral compositions (Wood and Blundy 1997;Hill et al 2011;Shimizu et al 2017).…”

Section: Constraining the Magma Reservoir Evolution Using Trace-elemementioning

confidence: 99%

Extraction of high-silica granites from an upper crustal magma reservoir: Insights from the Narusongduo magmatic system, Gangdese arc

Zhou

Yang

Wang

et al. 2020

American Mineralogist

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“…Similarly, at a melt-fraction of 20 % the proportion of amphibole decreases from ~30 % to ~21 % and 16 % as the apparent geotherm decreases from 1000 to 500°C/GPa. This decreases the λ 2 values of modelled melt compositions since amphibole, particularly the (magnesio-)hornblende to pargasitic compositions that are mainly present in metabasalts, preferentially incorporates the MREEs over LREEs or HREEs in their structure 40,41,42 .…”

Section: Petrogenetic Controls On the λ-Diagram Trendsmentioning

confidence: 99%

Archaean Cratons Record a Duality of Melting Regimes During Early Continental Growth

Ladwig¹,

Chowdhury²,

McCoy-West³

et al. 2020

Preprint

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The tectonic setting and pressure-temperature conditions responsible for the formation of felsic crust on the early Earth remain debated. Rare earth elements (REE) have been extensively used to study the formation of tonalite-trondhjemites-granodiorites (TTGs)- the building blocks of the early felsic crust, but conclusive interpretations based on the chondrite-normalized REE patterns have not materialised because of the inability to distinguish subtle differences. Here we apply a polynomial approach that quantifies the REE patterns by describing their slope and curvature using shaping coefficients to the TTG compositions from five different Archaean cratons. In combination with partial melting modelling, this enables an assessment of the effects of variations in pressure-temperature, degree of melting and residual mineral assemblages on the formation of TTGs. The REE composition of the Archaean TTGs display two distinct trends: (1) a horizontal-trend suggesting their formation in the presence of garnet-poor amphibolitic residues, possibly formed at the base of a thickened crust; and, (2) an inclined-trend consistent with their formation in equilibration with amphibole-poor, but garnet-rich residues at convergent settings (but not necessarily related to plate tectonics). These different melting regimes coexisted during the Paleoarchaean to Neoarchaean and provide direct evidence for a duality of petro-tectonic regimes of felsic crust formation on the early Earth.

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Parameterized lattice strain models for REE partitioning between amphibole and silicate melt

Cited by 56 publications

References 98 publications

Unravelling the complexity of magma plumbing at Mount St. Helens: a new trace element partitioning scheme for amphibole

Unravelling the complexity of magma plumbing at Mount St. Helens: a new trace element partitioning scheme for amphibole

Extraction of high-silica granites from an upper crustal magma reservoir: Insights from the Narusongduo magmatic system, Gangdese arc

Archaean Cratons Record a Duality of Melting Regimes During Early Continental Growth

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