Amphibole “sponge” in arc crust?

Davidson, Jon P.; Turner, Simon; Handley, Heather; Macpherson, Colin G.; Dosseto, Anthony

doi:10.1130/g23637a.1

Cited by 935 publications

(461 citation statements)

References 24 publications

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“…In contrast, large volumes of amphibole-rich cumulate rocks are abundant in middle to lower crust of volcanic arcs (Davidson et al, 2007). The formation of amphibole-rich cumulates in arc settings is well studied both empirically and experimentally (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…This is also supported by the whole rock compositions. As noted by Davidson et al (2007) amphiboles can easily fractionate MREE and HREE elements because Dy is more compatible in amphibole than Yb. Thus formation of amphibole cumulates produce an amphibole signal (decreasing Dy/Yb with increasing SiO 2 ) during magma differentiation.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The amphibole "sponge" model was developed for arc settings (Davidson et al, 2007). However the Ditrău Alkaline Massif represents an intraplate magmatic series, thus amphibole "sponge"…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Origin of mafic and ultramafic cumulates from the Ditrău Alkaline Massif, Romania

Pál-Molnár

Batki

Almási

et al. 2015

Lithos

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Mafic-ultramafic cumulates enclosed in gabbroic-dioritic rocks form part of the Mesozoic Ditrău Alkaline Massif in the Eastern Carpathians, Romania. The poikilitic olivine-and pyroxene-rich and nearly mono mineralic hornblendite rocks display typical cumulate textures with early crystallised olivine ), diopside and augite. In the early stages of their genesis the amphibole was intercumulus while in later stages it acquired cumulus status as the fractionating magma evolved. Using major and trace element compositions of minerals and whole-rock samples the origin of these cumulates is determined and the parental magma composition and depth of emplacement are calculated.Cumulus clinopyroxene has more primitive composition than intercumulus amphibole suggesting closed system fractionation for the evolution of poikilitic olivine-and pyroxenerich cumulates. The evolution of the amphibole-rich mesocumulates is more clearly the result of closed system crystallisation dominated by the precipitation of clinopyroxene and amphibole cumulus crystals.Lamprophyre dykes of the Ditrău Alkaline Massif are proposed to reflect multiple basanitic parental magma batches from which the cumulus olivine and clinopyroxene crystallised. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 Relative to these dykes the calculated equilibrium melts for intercumulus amphibole in the cumulates was more primitive whilst that for the cumulus amphibole was more evolved. The calculated crystallisation temperature and pressure of ~1000-1050 °C and ~0.7 GPa, based on the composition of the amphiboles, indicate crystallisation at lower crustal depths. Rare earth element compositions are consistent with an intra-plate tectonic setting.

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Section: Introductionmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

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Origin of mafic and ultramafic cumulates from the Ditrău Alkaline Massif, Romania

Pál-Molnár

Batki

Almási

et al. 2015

Lithos

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“…These low T TiZ temperatures probably suggest that PDL zircons crystallized under lower solidus temperature conditions associated with water-rich magmas (Fu et al, 2008), or their parental magmas have undergone the fractionation of amphibole before the zircon crystallization (see Section 5.1.2). The fractionation of amphibole could efficiently drove the melt compositions to lower TiO 2 concentrations (Davidson et al, 2007), and thus depleted the available Ti budget for the later crystallized zircons, and resulting in zircons with lower Ti concentrations and lower calculated zircon T Tiz values. Additionally, the Ti-in-zircon thermometer may actually underestimate true crystallization temperatures (Fu et al, 2009) owing to the uncertainties in inferred activities of SiO 2 and TiO 2 , effect of pressure correction, subsolidus resetting of Ti compositions, non-Henry's Law substitution of Ti in zircon, disequilibrium crystallization from melts, and thus PDL zircons may have formed at even higher temperatures.…”

Section: Zircon Oxygen Isotope and Te Systematics: Implications For Cmentioning

confidence: 99%

Oxygen isotope and trace element geochemistry of zircons from porphyry copper system: Implications for Late Triassic metallogenesis within the Yidun Terrane, southeastern Tibetan Plateau

Kong

Chen

2016

Chemical Geology

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“…The origin of I-type granitoids in arcs is very much discussed, and proposed models can be grouped in two endmember processes: partial melting of amphibolites in the lower arc crust (e.g., Clemens 1990;Clemens and Vielzeuf 1987;Tatsumi et al 2008Tatsumi et al , 2009 or hydrous high-to medium-pressure magma differentiation with limited amount of assimilation in the lower crust (e.g., Davidson et al 2007;Jagoutz et al 2009;Sisson et al 2005). We have previously discussed the origin of the Kohistan arc granitoids based on a more limited dataset and from the perspective of processes in the lower arc crust exposed in the Southern Plutonic Complex and the Chilas Complex (Jagoutz 2010;Jagoutz et al 2009Jagoutz et al , 2011.…”

Section: Origin Of the Kohistan Batholith Granitoidsmentioning

confidence: 99%

TTG-type plutonic rocks formed in a modern arc batholith by hydrous fractionation in the lower arc crust

Jagoutz¹,

Schmidt

Enggist

et al. 2013

Contrib Mineral Petrol

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We present the geochemistry and intrusion pressures of granitoids from the Kohistan batholith, which represents, together with the intruded volcanic and sedimentary units, the middle and upper arc crust of the Kohistan paleo-island arc. Based on Al-in-hornblende barometry, the batholith records intrusion pressures from *0.2 GPa in the north (where the volcano-sedimentary cover is intruded) to max. *0.9 GPa in the southeast. The Al-in-hornblende barometry demonstrates that the Kohistan batholith represents a complete cross section across an arc batholith, reaching from the top at *8-9 km depth (north) to its bottom at 25-35 km (south-central to southeast). Despite the complete outcropping and accessibility of the entire batholith, there is no observable compositional stratification across the batholith. The geochemical characteristics of the granitoids define three groups. Group

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Amphibole “sponge” in arc crust?

Cited by 935 publications

References 24 publications

Origin of mafic and ultramafic cumulates from the Ditrău Alkaline Massif, Romania

Origin of mafic and ultramafic cumulates from the Ditrău Alkaline Massif, Romania

Oxygen isotope and trace element geochemistry of zircons from porphyry copper system: Implications for Late Triassic metallogenesis within the Yidun Terrane, southeastern Tibetan Plateau

TTG-type plutonic rocks formed in a modern arc batholith by hydrous fractionation in the lower arc crust

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