30 Oct 2007 [1] Anorthosites, igneous rocks very rich in plagioclase, [2] Anorthosite, a plutonic igneous rock composed Thin section observations on.

Microscopic examination of a thin section of garnet anorthosite from the former locality showed it to consist predominantly of scapolitised plagioclase; large (2 - 9mm) garnets, altered to kelyphite on their margins; and minor clinopyroxene, hornblende and magnetite-ilmenite.

Mineral and rock thin sections are mounted on 27 x 46 mm microscope slides, and protected by a glass coverslip. All thin section slides are labeled for reference. 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. Lunar Basalt 12005, Apollo 12.

Anorthosite thin section

Dispersion: r < v; weak. ® = 1.573{1.577 ¯ = 1.580{1.585 ° = 1.585{1.590 2V(meas.) = 78±{83± Cell Data: Space Group: P1 (low). a = 8.1768 b = 12.8768 c = 14.1690 ® = 93:17± ¯ = 115:85 ±° = 92:22 Z = 8 X-ray Powder Pattern: Monte Somma, Italy (low). Se hela listan på en.wikipedia.org Most anorthosite layers are thin (less than 3 m) and only one analysis of plagioclase was obtained for the entire layer. However, to determine possible internal variation, two thick layers were studied in detail.

Anorthosite: Anorthosite: A leucocratic coarse-grained plutonic rock consisting essentially of plagioclase (usually labradorite or bytownite) often with small amounts of pyroxene.

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. Cite. 10th Dec, 2016.

Brookdale. WISCONSIN.

The microscopic examination of thin-sections in the petrographic analysis also provides important grain size, textural Quartz monzogabbro. Quartz anorthosite.

From the Bushveld Igneous Complex. Date: 27 June 2005: Source: at least one section of the anorthosite massif, Concordant gabbro dike showing sharp contacts with anorthosite In thin section the mineral is pale green.

Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present.
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The age of this rock is 4440 million years. Olivine - Trace olivine Fo 65-67 is found with low-Ca pyroxene in “mafic clumps.” Thin section slides are precisely ground to a thickness of 0.03 mm across the entire specimen area. Mineral and rock thin sections are mounted on 27 x 46 mm microscope slides, and protected by a glass coverslip. All thin section slides are labeled for reference.

Thin section.
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plagioclase megacrysts from the Chugwater anorthosite yields a baddeleyite age of 1435.4. + 0.5 Ma thin section, zircon is typically I mm in diameter, with.

Amazonite, Colorado, 0, Ritter 154, Habit: Found in thin sections as clusters of 100 mikron sized grains. They are sorrounded by a characteristic double corona texture. Description: In a strongly supplemented by thin sections, lithogeochemical analyses and radiometric 24), with layers of basic rocks such as norite, gabbro, amphibolite and anorthosite.