Variation in rock quality between metamorphic domains in the

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This rock is composed of calcic plagioclase with less than 10% ferro-magnesium minerals. The plagioclase may be labradorite, bytownite, or anorthite. In the IUGS classification, anorthosite contains 0-5% Q, P/(A + P) >90, and M < 10 (M = Mafics). The name is from anorthose, an old name for triclinic feldspars. A thin section of the anorthosite sample was prepared and subsequently pol-ished.

You can find the explanation on the plagioclase feldspar page. 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. Ths rock has a continuum of grain sizes, from very small to quite large.

Dickinson et al.

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Ryder G. (1990) Lunar samples, lunar accretion and the early bombardment of the Moon. EOS March 6, 313-315. Sato M., Hicklin N.L. and McLane J.E. (1973) Oxygen fugacity values of … So, take a look at the thin section pictures for the three lunar basalts below, and give these three rocks textural names! Lunar Basalt 12002, Apollo 12.

U-Pb zircon age of c Ma syenogranite within the protogine zone at

Mode of occurrence. Anorthosite plutons occur in a wide range of sizes. Some smaller plutons, exemplified by many anorthosite bodies in the U.S. and Harris in Scotland, cover only a few dozen square kilometres. Larger plutons, like the Mt. Lister Anorthosite, in northern orites mention clasts of anorthosite, but pyroxene- and olivine-bearing feldspathic lithologies such as impact-melt breccias, granulitic breccias, norites, and troctolites are mentioned just as frequently. Our own study of the 98 largest clasts in a thin section of Shişr 161 (25.2% Al. 2. O. 3) yielded only 4 of pure plagioclase [9]. Of 100 Andesite.

The section is ~1 m thick, but the horizontal scale is not linear. To the left the Nodular Troctolite consists of olivine oikocrysts 20–30 cm long (pale) set in a matrix of anorthosite Many anorthosite outcrops are transected by thin veins and stringers of quartz and feldspar, manifesting incipient disaggregation by the granitic protolith to the host quartzofeldspathic gneiss.
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Parts of large plagioclase crystals fill the view (crossed polarized light -XPL-), even at a low magnification (40x).

Tunn sektion av kvartsit. Granat glimmer schist. Is. Gabbro från Rum, Skottland. Bronsitit.
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This to be a thin skin with vanishing thermal capacity. Several authors Anorthosite. 1. 76 1.68.

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Pictures and Descriptions of Anorthosite Thin Sections (cont.) 2.2 Secondary Minerals Quartz.