A specimen of a coarse-grained garnet-gedrite-biotite rock_______________________________________________. 12. 5. Photomicrograph of a thin section

As part of our studies on warm asphalt mixture production at about 100 °C using foamed bitumen Åldringsgraden hos de gamla bindemedlen; flera bindemedel åldrades i en Thin Film Oven. • Bitumenkälla och Anorthosite, NO. Sparagmitt

For example, it could replace kaolin, a major component of glass fiber manufacturing. Jan 19, 2017 - Photomicrograph of a thin section showing twinned, aligned plagioclase in anorthosite. A coarse grained igneous rock, anorthosite is characterized by being almost completely composed of plagioclase. Thin section (plane polarized light) of glassy phonolite (kenyte) lava with a large, sieve-textured anorthoclase crystal, Teleki Tarn, Mount Kenya. The glass is a quenched mixture of more than one melt, with different Fe contents and ferric/ferrous ratios resulting in contrasting colors.

Anorthosite thin section

Composed of calcic plagioclase with less than 10% ferro-magnesium minerals - plagioclase may be labradorite, bytownite, or anorthite. The name is from anorthose, an old name for triclinic feldspars. Anorthosite is often associated with gabbro rocks of the anorthosite kindred and the NE-SW direction of the quartzitic schists. The rocks are folded in small and pointed folds; the fold-axes run NS, and they are as a rule horizontal or have a slight dip towards the north. A total of 11 thin sections from mica schist Description more details. This is a thin section of an ancient rock from Norway. From the Rogaland anorthosite area, this sample is from a ilmenite rich deposit that has been mined for iron/titanium.

The name is from anorthose, an old name for triclinic feldspars. Anorthosite is often associated with gabbro.

17 Feb 2013 the lunar surface2–4 and in volcanic rocks5–9 and regolith10. Part estimation) and after the heating experiment (lower thin curve) at the.

BASALT olivine, La Bajada Hill NM Quarternary. 5. BASALT scoriaceous NM recent flow. 6.

Anorthite is the calcic end member of the plagioclase feldspar series. In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). You can find the explanation on the plagioclase feldspar page. Anorthite weathers quite readily, so it’s not terribly abundant on Earth.

Dickinson et al. (1985) studied basalts from the processing fines. But Paul Warren made the most fuss, so we shall start with his observations: c1 (W-101) from ,46 and ,116 Massif anorthosite • Layring is not found in massif anorthosite. • It contain plagioclase of An35-65 range. 14. ORIGIN of anorthosite Magmatic Origin: Massif anorthosite are magmatic and layered anorthosites are magmatic differentiation. • It has been derived from a basic magma either grabbroic or … Anorthosite is a rock type of the mafic-ultramafic succession, The thin section above doesn't allow evaluation of textures that may be related to overgrowths.

This rock is composed of calcic plagioclase with less than 10% ferro-magnesium minerals. The plagioclase may be labradorite, bytownite, or anorthite.
Sjukpenning arbetslös försäkringskassan

It is not clear whether massifs and related mafic intrusions throughout the Nain Province of Labrador were derived from enriched mantle, or were contaminated by early Archean (greater than 3500 Ma) silicic crustal materials, heretofore thought to be restricted to coastal Labrador. Anorthosite Thin Sections (cont.) 2.2 Secondary Minerals Quartz. Quartz can be considered as a secondary mineral in anorthosite, since it represents less than 5% on the QAPF diagram. General view of an anorthosite from Minnesota in thin section.

No need to register, buy now!
Kiirunavaara gruva

2019-06-03 · One distinctive feature of some komatiites is spinifex texture, in which the rock is crisscrossed with long, thin olivine crystals. Spinifex texture is commonly said to result from extremely fast cooling, but recent research points instead to a steep thermal gradient, in which olivine conducts heat so rapidly that its crystals grow as wide, thin plates instead of its preferred stubby habit.

It does not have a phenocrystic texture, having larger crystals set in a much finer-grained matrix. The rock type is anorthosite, a cumulate rock made mostly of plagioclase. Cumulate rocks typically have the same minerals about the same size. Anorthosite: Anorthosite: A leucocratic coarse-grained plutonic rock consisting essentially of plagioclase (usually labradorite or bytownite) often with small amounts of pyroxene. Olivine, amphibole, ilmenite, magnetite, and spinel are also sometimes present. The term anorthosite, from Frenc anorthose (term for plagioclase) was coined by Sterry Hunt.