The construction of the Total Alkali-Silica chemical classification of volcanic rocks

Bas, M. J. Le; Maitre, R. W. Le; Woolley, A. R.

doi:10.1007/bf01160698

Cited by 188 publications

(32 citation statements)

References 17 publications

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“…Cantera is mainly composed by SiO 2 , Al 2 O 3 , K 2 O, Na 2 O, Fe 2 O 3 , and CaO, being in agreement with the chemical composition reported by Celik and Ergul [28]. Due to the total alkali (Na 2 O+K 2 O) versus silica (SiO 2 ) composition, this cantera tuff is Rhyolite [28,29].…”

Section: Methodssupporting

confidence: 88%

Photon Shielding Features of Quarry Tuff

et al. 2017

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Abstract. Cantera is a quarry tuff widely used in the building industry; in this work the shielding features of cantera were determined. The shielding characteristics were calculated using XCOM and MCNP5 codes for 0.03, 0.07, 0.1, 0.3, 0.662, 1, 2, and 3 MeV photons. With XCOM the mass interaction coefficients, and the total mass attenuation coefficients, were calculated. With the MCNP5 code a transmission experiment was modelled using a point-like source located 42 cm apart from a point-like detector. Between the source and the detector, cantera pieces with different thickness, ranging from 0 to 40 cm were included. The collided and uncollided photon fluence, the Kerma in air and the Ambient dose equivalent were estimated. With the uncollided fluence the linear attenuation coefficients were determined and compared with those calculated with XCOM. The linear attenuation coefficient for 0.662 MeV photons was compared with the coefficient measured with a NaI(Tl)-based J-ray spectrometer and a 137 Cs source.

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Section: Methodssupporting

confidence: 88%

Photon Shielding Features of Quarry Tuff

et al. 2017

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“…5). On the TAS diagram (Le Bas et al 1992, Fig. 6a), the rocks are mainly basalts with some picrobasalts and trachybasalts.…”

Section: Geochemical Classificationsmentioning

confidence: 99%

“…6 Classification of the metabasites (metagabbros, metadolerites, amphibolites) and basaltic andesites of the Izera Complex. a Total alkalisilica (TAS) classification after Le Bas et al (1992). The broken line separates the alkaline and subalkaline series of Irving and Baragar (1971).…”

Section: Major and Trace Elementsmentioning

confidence: 99%

Petrogenesis of continental mafic dykes from the Izera Complex, Karkonosze-Izera Block (West Sudetes, SW Poland)

Ilnicki

2009

Int J Earth Sci (Geol Rundsch)

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The Izera Complex (West Sudetes) contains widespread bodies of metagabbro, metadolerite and amphibolite (the Izera metabasites), and less abundant dykes of weakly altered dolerites, emplaced in a continental setting. The primary magmas of the Izera metabasites were probably formed through adiabatic decompression melting of upwelling asthenosphere (mantle plume) that was associated with the early Palaeozoic fragmentation of Gondwana (initial rift). The rocks are mildly alkaline, transitional-to-tholeiitic basalts and have OIB-like trace element patterns. Trace element modelling reveals that the mafic magmas were generated by variable degrees of partial melting (1-7%) of fertile, garnet-bearing asthenospheric source similar in composition to primitive mantle. Together with an increase in degree of partial melting, the compositional affinity of the magmas and the depth of segregation changed progressively from ca. 70-90 km (mildly alkaline magmas of the metadolerites and amphibolites) to ca. 60-75 km (transitional-to-tholeiitic magmas of the metagabbros). The systematics of incompatible versus compatible element distribution, and major and trace element modelling, indicate that some rocks experienced low-pressure (\5 kbar) differentiation resulting in up to 50% fractionation of clinopyroxene, olivine and minor plagioclase and ilmenite. The genetically distinct weakly altered dolerites are basaltic andesite in composition and possibly related to late-or post-orogenic events in the Karkonosze-Izera Block. These rocks are calc-alkaline, with relatively flat MREE-HREE patterns, enrichment in LREE and other highly incompatible elements relative to primitive mantle, and negative Nb-Ta, Ti, P anomalies. The geochemical features and geochemical modelling, indicate that their primary magmas segregated at depths B70 km and were produced by *2% melting of a metasomatized sublithospheric mantle source presumably containing small amounts of hydrated phases. Although the present study is inconclusive as to the origin of the metasomatic component in the source (? slab-derived fluid/ melts, OIB-like alkaline melt percolation of subcontinental lithosphere), the genesis of the Izera basaltic andesites is seemingly related to upwelling of asthenosphere and heat flow triggered by a postulated decoupling of the mantle lithosphere and post-collisional extensional collapse and uplift in the Karkonosze-Izera Block.

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“…Shasta. Most range from basaltic andesite to andesite in composition (Fig 5-10) with the notable exception of the AMOL inclusions which have more alkalis and are borderline between the andesite-trachyandesite transitions [Le Bas et al, 1992]. The quenched liquid type inclusions range from 53.6 wt% to 61.5 wt% SiO 2 .…”

Section: Whole Rock Geochemistrymentioning

confidence: 99%

Experimental studies of melting and crystallization processes in planetary interiors

Krawczynski¹

2011

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Melting and crystallization processes on the Earth and Moon are explored in this thesis, and the topics of melt generation, transport, and crystallization are discussed in three distinct geologic environments: the Moon's mantle, the Greenland ice sheet, and the Earth's crust. Experiments have been conducted to determine the conditions of origin for two high-titanium magmas from the Moon. The lunar experiments (Chapter 2) were designed to explore the effects of variable oxygen fugacity (f O 2 ) on the high pressure and high temperature crystallization of olivine and orthopyroxene in high-Ti magmas. The results of these experiments showed that the source regions for the high-Ti lunar magmas are distributed both laterally and vertically within the lunar mantle, and that it is critical to estimate the pre-eruptive oxygen fugacity in order to determine true depth of origin for these magmas within the lunar mantle. Chapter 3 models the behavior of water flow through the Greenland ice sheet driven by hydrofracture of water through ice. The results show that melt water in the ablation zone of Greenland has almost immediate access to the base of the ice sheet in areas with up two kilometers of ice. Chapter 4 is an experimental study of two hydrous high-silica mantle melts from the Mt. Shasta, CA region. Crystallization is simulated at H 2 O saturated conditions at all crustal depths, and a new geobarometerhygrometer based on amphibole magnesium number is calibrated. In Chapter 5 I use the new barometer to study a suite of mafic enclaves from the Mt. Shasta region, and apply it to amphiboles in these enclaves. Evidence for pre-eruptive H 2 O contents of up to 14 wt% is presented, and bulk chemical analyses of the inclusions are used to show that extensive magma mixing has occurred at all crustal depths up to 35 km beneath Mt. Shasta. Tim Grove. I can never repay all the knowledge, time, trust, friendship, and guidance that you have freely given to me. You are more than an advisor; you made me feel like family. Your endless energy and passion for petrology has rubbed off on me, and has reinforced my desire to pursue the origins of igneous rocks. The time we spent in the field is the most fun I have ever had, and has taught me that geology necessarily happens in the field as well as the lab. Those experiences will shape the future of my geologic career. In the lab you trusted me to make my own scientific decisions, and then patiently helped me fix all the equipment I broke and set me straight on some of the wacky decisions I made! You read all of the early drafts of this thesis, practiced all my talks over and over with me, and at times I know it was painful, but you shaped me into a scientist. I am truly honored that my thesis will always sit right above your desk, with all of your great students. I hope that someday I will live up to your expectations of me and I promise to pass on the dedication and care to my own students that you have showed me. In the future, stop by for a visit in my thermodynamics/petrology/...

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The construction of the Total Alkali-Silica chemical classification of volcanic rocks

Cited by 188 publications

References 17 publications

Photon Shielding Features of Quarry Tuff

Photon Shielding Features of Quarry Tuff

Petrogenesis of continental mafic dykes from the Izera Complex, Karkonosze-Izera Block (West Sudetes, SW Poland)

Experimental studies of melting and crystallization processes in planetary interiors

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