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Chemical variation of clinopyroxene phenocrysts from the trachybasaltic lavas of Mount Etna, Sicily
Angus M. Duncan,R. M. F. Preston +1 more
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The chemical variation of clinopyroxene phenocrysts from the trachybasaltic lavas of Etna volcano is described in this article, showing that the trend of this variation is unusual, being one of Mg-enrichment with differentiation of the magma.Abstract:
The chemical variation of clinopyroxene phenocrysts from the trachybasaltic lavas of Etna volcano is described. The phenocrysts show a limited, but distinct trend in chemical variation from calcic-augite in the hawaiites to augite in the benmoreites. The trend of this variation is unusual, being one of Mg-enrichment with differentiation of the magma. Ca shows a steady decrease in the clinopyroxenes from the hawaiites to the benmoreites. Na, however, shows little chemical variation in the pyroxenes. The trace element chemistry is briefly examined. The clinopyroxenes show well-developed oscillatory and sector zoning. The basal {11} sectors are enriched in Si and Mg and depleted in Ti, Al, and Fe relative to the {100}, {110}, and {010} prism sectors.read more
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Clinopyroxene geobarometry of magmatic rocks Part 1: An expanded structural geobarometer for anhydrous and hydrous, basic and ultrabasic systems
Paolo Nimis,Peter Ulmer +1 more
TL;DR: In this paper, the authors used the clinopyroxene database with over one hundred experiments from literature and sixteen previously unpublished experiments on basanite and picrobasalt starting materials for calibration of geobarometers based on unitcell volume (Vcell) vs. M1-site volume (VM1).
Journal ArticleDOI
Sector-zoned clinopyroxene as a recorder of magma history, eruption triggers, and ascent rates
TL;DR: In this paper, the authors combine electron probe and laser ablation micro-chemical maps of titanaugite crystals from Mt. Etna (Sicily, Italy) to explore the origin of sector zoning at the major and trace element levels, and its implications for the interpretation of magmatic histories.
Journal ArticleDOI
Clinopyroxene in postshield Haleakala ankaramite: 2. Texture, compositional zoning and supersaturation in the magma
TL;DR: In this article, the authors investigated the external morphologies and internal compositional zoning patterns of clinopyroxene phenocrysts in an ankaramite of Haleakala volcano (Hawaii) to constrain magma crystallization conditions in the volcano's postshield stage.
Journal ArticleDOI
Deep Magma Storage revealed by Multi-Method Elemental Mapping of Clinopyroxene Megacrysts at Stromboli Volcano
Teresa Ubide,John Caulfield,Claire Brandt,Yannick Bussweiler,Silvio Mollo,Silvio Mollo,Flavio Di Stefano,Manuela Nazzari,Piergiorgio Scarlato +8 more
TL;DR: In this paper, the authors combine textural and chemical data acquired on large euhedral augite megacrysts from Roman era activity (Pizzo scoria cone, 2.4-1.8 ka) at Stromboli (Italy) to investigate the plumbing system prior to the onset of current steady-state activity.
Journal ArticleDOI
The role of undercooling during clinopyroxene growth in trachybasaltic magmas: Insights on magma decompression and cooling at Mt. Etna volcano
Matteo Masotta,Alessio Pontesilli,Silvio Mollo,Silvio Mollo,Pietro Armienti,Teresa Ubide,Manuela Nazzari,Manuela Nazzari,Piergiorgio Scarlato +8 more
TL;DR: In this paper, isothermal and undercooling experiments were conducted on one of the most primitive trachybasalts from Mt. Etna volcano in order to examine the crystallization mechanisms controlling the textural and compositional variability of clinopyroxene.
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Mineralogical applications of crystal field theory
TL;DR: The second edition of this classic book as discussed by the authors provides an updated look at crystal field theory and its applications and highlights the properties of minerals that make them compounds of interest to solid-state chemists and physicists as well as to all earth and planetary scientists.