Geochemistry of pyroxene inclusions from the Warrumbungle Volcano, New South Wales, Australia
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Mohammad R. Ghorbani
und
Eric A.K. Middlemost
Abstract
Pyroxenes provide an elegant key to understanding the tangled petrogenesis of the diverse midalkaline rocks of the Warrumbungle Volcano. These rocks evolved from two primary magmas, and the pyroxenes record the various stages in their origin and evolution. Trace-element abundance patterns for chromian diopside crystals from a spinel-lherzolite xenolith provide evidence of an early mantle-depletion event. Depleted spinel-lherzolite is an appropriate mantle source for the ITEP (incompatible-trace-element-poor) series of rocks. Subcalcic augite megacrysts are common in the basic rocks of this series. They crystallized in a high-pressure, intratelluric environment where they controlled the initial magmatic differentiation of the ITEP series. Aluminian augite occurs as megacrysts and also in gabbronorite xenoliths found in one of the more differentiated rocks of the ITEP series. This pyroxene crystallized in a lower-crustal magma chamber where its host magma was peraluminous and intermediate in composition. A few clinopyroxene (Cpx) megacrysts are Ferich and exceptionally enriched in rare-earth elements (REE). They crystallized from a moderately differentiated magma, locally contaminated by crustal material, or were later subjected to a metasomatic event. One of the nepheline-normative basic rocks of the ITER (incompatible-trace-elementrich) series contains small inclusions of K-rich omphacite. This phase contains one of the highest K contents (0.6-2.3 wt%) ever reported in a Cpx, and crystallized from a K-rich liquid at a greater depth than any of the other pyroxenes, probably deep within the upper mantle. Orthopyroxene (Opx) megacrysts are rare and belong to at least three geochemically distinct types: in association with chromian diopside, with subcalcic augite, and with aluminian augite megacrysts. Each type of Opx crystallized in a separate chemical and physical environment.
© 2015 by Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
- Nucleation and growth kinetics of analcime from precursor Na-clinoptilolite
- Viscosities of granitic (sensu lato) melts: Influence of the anorthite component
- Geochemistry of pyroxene inclusions from the Warrumbungle Volcano, New South Wales, Australia
- Supersilicic clinopyroxene and silica exsolution in UHPM eclogite and pelitic gneiss from the Kokchetav massif, Kazakhstan
- Experimental study of intracrystalline Fe2+-Mg exchange in three augite crystals: Effect of composition on geothermometric calibration
- Transmission electron microscopy and differential thermal studies of lazurite polymorphs
- Re-equilibration of glass and CO2 inclusions in xenolith olivine: A TEM study
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- Pyrrhotite varieties from the 9.1 km deep borehole of the KTB project
- Mineralogy and magnetic behavior of pyrrhotite from a 260 °C section at the KTB drilling site, Germany
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- Electron energy-loss spectroscopy of silicate perovskite-magnesiowüstite high-pressure assemblages
- Magnesium coordination environments in glasses and minerals: New insight from high-field magnesium-25 MAS NMR
- In situ powder diffraction study of titanite (CaTiOSiO4) at high pressure and high temperature
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- Thermodynamics of multicomponent olivines and the solution properties of (Ni,Mg,Fe)2SiO4 and (Ca,Mg,Fe)2SiO4 olivines—Comment
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Artikel in diesem Heft
- Nucleation and growth kinetics of analcime from precursor Na-clinoptilolite
- Viscosities of granitic (sensu lato) melts: Influence of the anorthite component
- Geochemistry of pyroxene inclusions from the Warrumbungle Volcano, New South Wales, Australia
- Supersilicic clinopyroxene and silica exsolution in UHPM eclogite and pelitic gneiss from the Kokchetav massif, Kazakhstan
- Experimental study of intracrystalline Fe2+-Mg exchange in three augite crystals: Effect of composition on geothermometric calibration
- Transmission electron microscopy and differential thermal studies of lazurite polymorphs
- Re-equilibration of glass and CO2 inclusions in xenolith olivine: A TEM study
- Origin and structural character of haüyness in spinel dunite xenoliths from La Palma, Canary Islands
- Pyrrhotite varieties from the 9.1 km deep borehole of the KTB project
- Mineralogy and magnetic behavior of pyrrhotite from a 260 °C section at the KTB drilling site, Germany
- Surface defects and self-diffusion on pyrite {100}: An ultra-high vacuum scanning tunneling microscopy and theoretical modeling study
- Rare-earth elements in chlorapatite [Ca10(PO4)6Cl2]: Uptake, site preference, and degradation of monoclinic structure
- Thermal pressure in MgO and MgSiO3 perovskite at lower mantle conditions
- Electron energy-loss spectroscopy of silicate perovskite-magnesiowüstite high-pressure assemblages
- Magnesium coordination environments in glasses and minerals: New insight from high-field magnesium-25 MAS NMR
- In situ powder diffraction study of titanite (CaTiOSiO4) at high pressure and high temperature
- Surinamite: A high-temperature metamorphic beryllosilicate from Lewisian sapphirine-bearing kyanite-orthopyroxene-quartz-potassium feldspar gneiss at South Harris, N.W. Scotland
- Single-crystal X-ray diffraction study of FeGeO3 high-P clinopyroxene (C2/c) up to 8.2 GPa
- High-pressure Ca4Al6O13: An example of a calcium aluminate with three different types of coordination polyhedra for aluminum
- Cation distribution in synthetic zinc ferrite (Zn0.97Fe2.02O4) from in situ high-temperature neutron powder diffraction
- Infrared study of OH sites in tourmaline from the elbaite-schorl series
- Second occurrence of okayamalite, Ca2SiB2O7: chemical and TEM characterization
- Rietveld refinement of okayamalite, Ca2SiB2O7: Structural evidence for the B/Si ordered distribution
- Tumchaite Na2(Zr,Sn)Si4O11·2H2O—A new mineral from carbonatites of the Vuoriyarvi alkali-ultrabasic massif, Murmansk Region, Russia
- The crystal structure of thornasite, Na12Th3[Si8O19]4(H2O)18: A novel interrupted silicate framework
- Symesite, Pb10(SO4)O7Cl4(H2O), a new PbO-related sheet mineral: Description and crystal structure
- Na2Ca2(P2O7)F2, the first diphosphate of the cuspidine family
- Amphibole asbestos from Libby, Montana: Aspects of nomenclature
- Thermodynamics of multicomponent olivines and the solution properties of (Ni,Mg,Fe)2SiO4 and (Ca,Mg,Fe)2SiO4 olivines—Comment
- Thermodynamics of multicomponent olivines and the solution properties of (Ni,Mg,Fe)2SiO4 and (Ca,Mg,Fe)2SiO4 olivine—Reply
- Letter. Fivefold-coordinated aluminum in tectosilicate glasses observed by triple quantum MAS NMR
