A ternary feldspar-mixing model based on calorimetric data: development and application

Benisek, Artur; Dachs, Edgar; Kroll, Herbert

doi:10.1007/s00410-009-0480-8

Cited by 143 publications

(95 citation statements)

References 41 publications

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“…This consists of a succession of trachyte The 900 °C isotherm lines are from Benisek et al (2010) and Fuhrman and Lindsley (1988) and are provided for reference (quantitative temperature determination are done below). The inset shows the scanning electron microscope (SEM) back-scattered electron (BSE) image of a crystal from sample DZ06 partially exsolved to albite (Na ex) and orthoclase (K ex), as well as the retained unexsolved portion (unex).…”

Section: Central Cone (Takuhiyama) Trachytementioning

confidence: 99%

A trachyte–syenite core within a basaltic nest: filtering of primitive injections by a multi-stage magma plumbing system (Oki-Dōzen, south-west Japan)

Brenna

Nakada

Miura

et al. 2015

Contrib Mineral Petrol

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that distinguish it from the rest of the system. Geochemical modelling indicates that magmatic differentiation through crystal fractionation and minor crustal assimilation occurred in crustal and shallow sub-volcanic magma reservoirs. In the central part of the system, a number of vertically spaced reservoirs acted as a filter, capturing basaltic dykes and hindering their ascent. In the outer region, dykes either reached the surface unhindered and erupted to form the basaltic/trachybasaltic succession or stalled at crustal levels and differentiated to trachyte before forming dispersed domes/flows. The central plumbing system "filter" resulted in a nest-shaped volcano, with a trachytic core surrounded by basaltic products, and stopped direct injection of basaltic magmas into the shallow syenitic magma reservoir, likely preventing its destabilization and explosive eruption.

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Section: Central Cone (Takuhiyama) Trachytementioning

confidence: 99%

A trachyte–syenite core within a basaltic nest: filtering of primitive injections by a multi-stage magma plumbing system (Oki-Dōzen, south-west Japan)

Brenna

Nakada

Miura

et al. 2015

Contrib Mineral Petrol

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“…This system includes TiO 2 and O 2 which allow the consideration of ilmenite within the peak assemblages and have been shown to affect the stability of biotite at high temperatures (Tajčmanová et al 2009). The solution models used for these calculations were: orthopyroxene, clinopyroxene (Powell and Holland 1999) garnet, cordierite (Holland and Powell 1998), feldspar (Benisek et al 2010), white mica (Auzanneau et al 2010 andCoggon andHolland 2002), ilmenite (White et al 2000), biotite (Tajčmanová et al 2009), and silicate-melt (White et al 2007). …”

Section: P-t Pseudosection Modelingmentioning

confidence: 99%

Polymetamorphic evolution of the granulite-facies Paleoproterozoic basement of the Kabul Block, Afghanistan

2015

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The Kabul Block is an elongate crustal fragment which cuts across the Afghan Central Blocks, adjoining the Indian and Eurasian continents. Bounded by major strike slip faults and ophiolitic material thrust onto either side, the block contains a strongly metamorphosed basement consisting of some of the only quantifiably Proterozoic rocks south of the Herat-Panjshir Suture Zone. The basement rocks crop-out extensively in the vicinity of Kabul City and consist predominantly of migmatites, gneisses, schists and small amounts of higher-grade granulite-facies rocks. Granulite-facies assemblages were identified in felsic and mafic siliceous rocks as well as impure carbonates. Granulite-facies conditions are recorded by the presence of orthopyroxene overgrowing biotite in felsic rocks; by orthopyroxene overgrowing amphibole in mafic rocks and by the presence of olivine and clinohumite in the marbles. The granulite-facies assemblages are overprinted by a younger amphibolite-facies event that is characterized by the growth of garnet at the expense of the granulite-facies phases. Pressure-temperature (P-T) conditions for the granulite-facies event of around 850°C and up to 7 kbar were calculated through conventional thermobarometry and phase equilibria modeling. The younger, amphibolite-facies event shows moderately higher pressures of up to 8.5 kbar at around 600°C. This metamorphism likely corresponds to the dominant metamorphic event within the basement of the Kabul Block. The results of this work are combined with the lithostratigraphic relations and recent geochronological dating to analyze envisaged Paleoproterozoic and Neoproterozoic metamorphic events in the Kabul Block.

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“…Appendix 2: Thermodynamic modeling with PERPLE_X Perple_X version 6.6.6 (Connolly, 2009, and references therein) was used for all thermodynamic calculations, using the hp02ver.dat end member thermodynamic data set and the following solution models: cAmph(DP2) (clinoamphibole, Diener & Powell, 2011), Cpx(HP) (clinopyroxene, Holland & Powell, 1996), Ep(HP) (epidote, Holland & Powell, 1998), feldspar_B (feldspar, Benisek et al, 2010), and Ilm(WPH) (ilmenite, White et al, 2000). Calculations were done in the NaCaMgFeAlSiTiHO system.…”

Section: Appendix 1: Microbeam Analytical Methodsmentioning

confidence: 99%

Metamorphosed cumulate gabbros from the Støren Group of the Upper Allochthon, northern Western Gneiss Region, Norway: petrology and metamorphic record

Hollocher¹,

Robinson²,

Kennedy³

et al. 2015

NJG

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The Støren Group of the Upper Allochthon, in the Scandinavian Caledonides, contains Late Cambrian to Early Ordovician ophiolitic fragments that developed in a tholeiitic oceanic suprasubduction zone setting. These were obducted onto an epicontinental margin (Gula Complex) in the Early Ordovician, and metamorphosed in most areas to greenschist facies. Later, these rocks were thrust onto Baltica as part of the Upper Allochthon during the Silurian-Devonian Scandian Orogeny. Cumulate gabbros in the Støren Group contain the prograde metamorphic assemblage amphibole-plagioclase-diopside-epidote. They have complex textures that include early metamorphic mineral cores and inclusions, later rims, and late vein assemblages. The textures and mineral compositions in nine samples were interpreted iteratively with Perple_X thermodynamic modeling, to reveal three sequential P-T conditions: ~350°C and ~6 kbars for early prograde mineral cores and inclusions, ~530°C and ~6 kbars for peak prograde conditions, and ~425°C and ~3 kbars for an early retrograde vein assemblage. Additionally, minor but ubiquitous, discontinuous Fe 3+ -rich rims on epidote suggest the rocks underwent isothermal decompression immediately after peak prograde conditions, crossing increasingly Fe-rich epidote isopleths predicted by models. We interpret a single-episode, clockwise P-T path representing an Early Devonian phase of Scandian metamorphism. In the study area, prograde metamorphism produced these assemblages only in rocks close to the contact between the Upper and Middle allochthons, which is interpreted as a late-Scandian detachment fault (Agdenes detachment). Prograde Scandian metamorphism of this part of the Upper Allochthon was a form of contact metamorphism, occurring as the detachment fault juxtaposed cool Upper Allochthon rocks against the hotter, exhuming Middle Allochthon.

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A ternary feldspar-mixing model based on calorimetric data: development and application

Cited by 143 publications

References 41 publications

A trachyte–syenite core within a basaltic nest: filtering of primitive injections by a multi-stage magma plumbing system (Oki-Dōzen, south-west Japan)

A trachyte–syenite core within a basaltic nest: filtering of primitive injections by a multi-stage magma plumbing system (Oki-Dōzen, south-west Japan)

Polymetamorphic evolution of the granulite-facies Paleoproterozoic basement of the Kabul Block, Afghanistan

Metamorphosed cumulate gabbros from the Støren Group of the Upper Allochthon, northern Western Gneiss Region, Norway: petrology and metamorphic record

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