Plagioclase feldspars are key components of terrestrial planets and deriving their phase diagram activity–composition relations has been the subject many studies. Three main approaches have used for thermodynamic modelling behaviour plagioclase feldspars, all three disagree in terms magnitude relative importance mixing energies ordering energies. The present study uses Monte Carlo simulations b...

Plagioclase feldspar is a common mineral in terrestrial rocks and has recently been detected on Mars surface with visible near-infrared (VNIR) spectroscopy. The presence of plagioclase using this method determined through the identification an absorption band centered around 1.3 µm reflectance spectra which requires incorporation Fe2+ lattice. Previous laboratory studies powder mixtures showed ...

The application of melt inclusions (MI) to infer magmatic processes assumes the MI have remained as constant mass, volume systems since time trapping. Understanding effects both compositional and volumetric re-equilibration is key for interpretation data. Although behavior in quartz olivine has been studied some detail, process less understood other host phases such plagioclase, a common phase ...

Glossary andesite magma or volcanic rock is characterised by intermediate SiO2 concentration. Andesite magmas have rheological properties that are intermediate between basalt and rhyolite magmas. Silica content in andesites ranges from approximately 52 to 66 weight percent. Common minerals in andesite include plagioclase, amphibole and pyroxene. Andesite is typically erupted at temperatures bet...

apatite (a); c-cpx, f – iron, m – merrillite, s – silica, p – plagioclase. CL picture is slightly zoomed out. SHOCK-INDUCED TEXTURE IN LUNAR MG-SUITE APATITE AND ITS EFFECT ON VOLATILE DISTRIBUTION. A. Cernok1, J. Darling2, L. White2, J.Dunlop2, and M. Anand1,3. 1Open University, School of Planetary Sciences, Walton Hall, MK7 6AA, United Kingdom ([email protected]), 2University of Portsmout...

Late Wisconsin till of the Cuba Moraine in Ohio consists of sediment contributed by local Paleozoic bedrock and by the igneous and metamorphic rocks of the Canadian Precambrian Shield. Feldspar in this till is derived predominantly from the Grenville and Superior structural provinces of Canada which are 1.07 b.y. and 2.70 b.y. old, respectively. Rb-Sr provenance dates of feldspar in the — 18 +3...

Absbvct New petrographic and chemical data of volcanic rocks from the Metales Belt, Rio de las Tunas area, in the Frontal Cordillera of Argentina are presented. The rocks display a broadly basaltic composition. ‘PNO varieties of basaltic dikes can be differentiated. One group, whose mineralogy comprise essentially tremolite-actinolite, plagioclase, pyroxene and limited amounts of olivine as the...