Ti-content of high-Ca pyroxenes as a petrogenetic indicator: an experimental study of Mafic Alkaline Rocks from the Mt. Erebus volcanic region, Antarctica

Gerke, Tammie L.; Kilinc, A.; Sack, Richard O.

doi:10.1007/s00410-004-0636-5

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…CIPW norm calculated with Fe 2 O 3 /FeO ¼ 0Á15; empty cells, not determined; LOI; loss on ignition; DVDP2a is the experimental basanite of Gerke et al (2005) from Mt Erebus, Antarctica. (See text for details.…”

Section: Petrography and Chemistry Of The Xenolithsmentioning

confidence: 99%

“…Basanitic samples from the FGG facies of the domes are most suitable for estimation of the magma temperature during its transport and emplacement at the surface. To evaluate their temperature of crystallization, we used the experimental work of Gerke et al (2005) on compositionally similar basanites from Mt Erebus at atmospheric pressure and at fO 2 $ QFM. The experimental rock not only has a very similar wholerock composition (Table 1), but the run products show the same sequence of crystallization and olivine compositional shift (Fo 87-76 ) as the basanites from our study (Fo 88-71 ).…”

Section: Temperature Of Crystallization Of the Host Basanitesmentioning

confidence: 99%

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Metasomatic Reaction Phenomena from Entrainment to Surface Cooling: Evidence from Mantle Peridotite Xenoliths from Bulgaria

Marchev¹,

Arai²,

Vaselli³

et al. 2017

Journal of Petrology

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We present a detailed study of the mineralogical and chemical modifications of peridotite xenoliths during magma transport and cooling at the Earth's surface. The xenoliths are entrained in three small-volume (<1 km 3 ), monogenetic, Miocene-Oligocene, basanite domes in the Moesian Platform, north Bulgaria, arranged along a NNE-directed right-lateral strike-slip fault. The domes show symmetrically decreasing volumes of erupted magma correlated with the size and quantity of the entrained xenoliths, according to their position along the fault. The xenoliths exhibit different degrees of mineralogical and chemical interaction with their host rocks, with the extent of interaction strongly depending on their position in the dome. Xenoliths from the fine-grained brecciated carapaces of the domes show very thin, fine-grained, reaction rims around orthopyroxene and spinel, and thin diffusion zones around olivine, limited mostly to the rims of the xenoliths. Clinopyroxene shows almost no visible reaction and is always strongly depleted in light rare earth elements (LREE) and Sr. Melt pockets in the xenoliths are small, composed mostly of fine-grained olivine and clinopyroxene. Modelling of Fe-Mg zoning in olivine suggests a very short residence time of a few days in the magma during transport and fast cooling at the Earth's surface. In contrast, xenoliths from the interior of the domes, hosted in holocrystalline groundmass, are much more strongly affected by the host basanite magma. Their constituent minerals have wider reaction rims around orthopyroxene, sometimes leading to its entire consumption, and show transformation of spinel into chromite. Fe-Mg diffusion profiles in olivine are up to 400 lm wide and calculations indicate diffusion times up to 200 days, recording protracted cooling in the inner part of the dome. Melt pockets are much larger and coarser-grained, composed of minerals identical to the host groundmass. With few exceptions, clinopyroxene is sieve-textured and shows variable enrichment in LREE and Sr, ranging from several times higher than in the depleted xenoliths to complete equilibration with the host basanite. Strongly veined xenoliths show stronger chemical modifications, facilitated by infiltrated melt, which also progressively increase depending on the position of the xenoliths in the dome. The most enriched xenoliths from the core of the dome exhibit large inter-and intra-grain variations in Sr and LREE. Our study demonstrates that chemical and mineral modifications, although starting at the time of entrainment of the xenoliths at mantle depths, were completed mostly during their residence in the magma at the surface. The reaction phenomena are

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Section: Petrography and Chemistry Of The Xenolithsmentioning

confidence: 99%

Section: Temperature Of Crystallization Of the Host Basanitesmentioning

confidence: 99%

Metasomatic Reaction Phenomena from Entrainment to Surface Cooling: Evidence from Mantle Peridotite Xenoliths from Bulgaria

Marchev¹,

Arai²,

Vaselli³

et al. 2017

Journal of Petrology

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show abstract

“…Most of the D P data from Gerke et al (2005), Toplis and Carroll (1995) and Toplis et al (1994) scatter with no obvious trend, and were excluded from the regression. The best behaved data are those of Bindeman et al (1998), Bindeman and Davis (2000), and Tuff et al (2005); and the regression obtained (Eq.…”

Section: Large Ion Lithophile Elements (Lile) and Alkaline Earths: Kmentioning

confidence: 99%

Trace element partitioning in plagioclase feldspar

Bédard

2006

Geochimica et Cosmochimica Acta

195

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High-Ti amphibole as a petrogenetic indicator of magma chemistry: evidence for mildly alkalic-hybrid melts during evolution of Variscan basic–ultrabasic magmatism of Central Iberia

Molina

Scarrow

Montero

et al. 2009

Contrib Mineral Petrol

109

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Ti-content of high-Ca pyroxenes as a petrogenetic indicator: an experimental study of Mafic Alkaline Rocks from the Mt. Erebus volcanic region, Antarctica

Cited by 9 publications

References 21 publications

Metasomatic Reaction Phenomena from Entrainment to Surface Cooling: Evidence from Mantle Peridotite Xenoliths from Bulgaria

Metasomatic Reaction Phenomena from Entrainment to Surface Cooling: Evidence from Mantle Peridotite Xenoliths from Bulgaria

Trace element partitioning in plagioclase feldspar

High-Ti amphibole as a petrogenetic indicator of magma chemistry: evidence for mildly alkalic-hybrid melts during evolution of Variscan basic–ultrabasic magmatism of Central Iberia

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