Search Results

You are looking at 1 - 10 of 339 items :

  • "alkali basalt" x
Clear All

American Mineralogist, Volume 98, pages 1074–1077, 2013 0003-004X/13/0506–1074$05.00/DOI: http://dx.doi.org/10.2138/am.2013.4410 1074 Letter High-pressure aragonite phenocrysts in carbonatite and carbonated syenite xenoliths within an alkali basalt VratisLaV Hurai,1,* Monika HuraioVá,2 rastisLaV MiLoVský,3 JarMiLa LuptákoVá,3 and Patrik konečný4 1Geological Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, Slovakia 2Department of Mineralogy and Petrology, Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia 3

and Petrology, Comenius University , Bratislava, 1-75 (in Slovak). Hovorka D. & Lukáčik E. 1972: Xenoliths in andesites of the Massifs Karanč, Šiator (Southern Slovakia) and their geologic interpretation. Geol. Zbor. Geol. Carpath. 23, 297-303. Hurai V., Simon K., Wiechert U., Hoefs J., Konečný P., Huraiová M., Pironon J. & Lipka J. 1998: Immiscible separation of metalliferous Fe/Ti-oxide melts from fractionating alkali basalt: PT-fO 2 conditions and two-liquid elemental partitioning. Contr. Mineral. Petrology 133, 12-29. Huraiová M., Konečný P., Konečný V

M. & Kida M. 2004: Petrology of peridotite xenoliths from Iraya volcano, Philippines, and its implication for dynamic mantle-wedge processes. J. Petrology 45, 369–389. Arai S., Shimizu Y., Morishita T. & Ishida Y. 2006: A new type of orthopyroxenite xenolith from Takashima, Southwest Japan: silica enrichment of the mantle by evolved alkali basalt. Contr. Mineral. Petrology 152, 387–398. Bali E., Falus Gy., Szabó Cs., Peate D.W., Hidas K., Török K. & Ntaflos T. 2007: Remnants of boninitic melts in the upper mantle beneath the central Pannonian Basin? Miner

American Mineralogist, Volume 80, pages 1041-1047, 1995 Reaction of orthopyroxene in peridotite xenoliths with alkali-basalt melt and its implication for genesis of alpine-type chromitite SHOJI ARAI, NATSUE ABE Department of Earth Sciences, Faculty of Science, Kanazawa University, Kakuma, Kanazawa 920-11, Japan ABSTRACT The Kawashimo alkali basalt of the southwest Japan arc has peridotite xenoliths with a wide lithological range, from lherzolite {Fo of olivine, 89; Cr' [=Cr/(Cr + AI) atomic ratio] of spinel O.IO}to harzburgite (Fo of olivine, 91; Cr' of spinel, 0

., Németh K., Evidence for the neogene small-volume intracontinental volcanism in western Hungary: K/Ar geochronology of the Tihany Maar volcanic complex, Geol. Carpath., 2005, 56, 91–99 [76] Balogh K., Árva-Sós E., Pécskay Z., Ravasz- Baranyai L., K/Ar dating of post-Sarmatian alkali basaltic rocks in Hungary, Acta Mineralogica et Petrographica, Szeged, 1986, 28, 75–94 [77] Balogh K., Pécskay Z., K/Ar and Ar/Ar geochronological studies in the Pannonian-Carpathians-Dinarides (PANCARDI) region, Acta Geologica Academiae Scientiarum Hungaricae, 2001, 44, 281–301 [78

and MSL, it is evident that alkaline basaltic rocks are present on Mars, and their primary mineralogy, as well as any alteration products, needs to be further studied ( McSween et al. 2006 ; Stolper et al. 2013 ). The San Carlos suite of high-alkali basalts (basanites), studied here, with moderately high-alkali percentages and feldspathoid phases is particularly relevant as an analog. VSWIR spectral analyses detected metal-OH absorptions and Fe 3+ electronic transitions of secondary minerals formed by hydrous alteration and oxidation. Signs of hydration and

pyroxenesm, Mineral. J., 14, 198–221, 1989 http://dx.doi.org/10.2465/minerj.14.198 [31] Deer W.A., Howie R.A., Zussman J., Rock-forming Minerals. Single-chain silicates. 2d. ed., Longman, London, 1978, 668 [32] Bedard J.H., Francis D.M., Ludden J., Petrology and pyroxene chemistry of Monteregian dykes: the origin of concentric zoning and green cores in clinopyroxenes from alkali basalts and lamprophyres, Can. J. Earth Sci., 25, 2041–2058, 1988 http://dx.doi.org/10.1139/e88-190 [33] Leake B.E. (ed.) et al., Nomenclature of amphiboles: report of the Subcommittee on

.G., Deitrich H., Poultidis H., Petrology and geochemistry of peridotite xenoliths in alkali basalts from the Transdanubian Volcanic Region, West Hungary. J. Petrol., 1989, 30, 79–105. [15] Embey-Isztin A., Scharbert H.G., Deitrich H., Poultidis H., Mafic granulite and clinopyroxenite xenoliths from the Transdanubian Volcanic Region (Hungary): implications for the deep structure of the Pannonian Basin. Mineral. Mag., 1990, 54, 463–483. [16] Embey-Isztin A., Downes H., Kempton P.D., Dobosi G., Thirlwall M.F., Lower crustal granulite xenoliths from the Pannonian Basin

alkali basalt Brandberg Schmitt et al. 2000 Pantelleria Avanzinelli et al. 2004 White et al. 2009 . Notes: Sources of data: The modified alkali-lime index (MALI), a modification of the alkali-lime index of Peacock (1931) , is a robust discriminator for silica-rich granitic rocks in which CaO, Na 2 O, and K 2 O are major constituents ( Frost et al. 2008 ). It distinguishes rocks dominated by calcic to intermediate plagioclase from those with more sodic plagioclase and potassium feldspar. However, it does not separate sodium-rich rocks from potassic ones, a limitation

. (1993)]. This alkali basalt is aphanitic and microporphyritic with locally 5 vol% microphe- nocrysts of olivine (Fo90) in an intergranular, mildly trachytic groundmass of plagioclase and augite microlites (Fig. 1). It also contains scattered xenocrysts of olivine, up to 3 mm in diameter, which are partially resorbed and have cores of Fo73–76 (unpublished data). The sample was chosen because the phases of interest in this study, olivine and plagioclase, both occur close to the liquidus temperature. Olivine is the liquidus phase, appearing at 1190 ∞C, followed by