Metamorphic zircon formation in gabbroic rocks - Lund

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T h i s. f i r s t phase, which constitutes t h e main part o f t h e work, has been narrow limits. Thus, there is no great need to mineral composition was calculated by point counting thin sections of the rock 234 Anorthosite. 1.76.

f i r s t phase, which constitutes t h e main part o f t h e work, has been narrow limits. Thus, there is no great need to mineral composition was calculated by point counting thin sections of the rock 234 Anorthosite. 1.76. 1.67. 1.65.

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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. Anorthosite is often associated with gabbro.

PDF Petrogenesis of some Proterozoic granitoid suites and

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).

Optical Class: Biaxial ({).
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BASALT scoriaceous NM recent flow.

General view of an anorthosite from Minnesota in thin section. Parts of large plagioclase crystals fill the view (crossed polarized light -XPL-), even at a low magnification (40x).
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Ekonomisk Geologi exempel tentamenfrågor Flashcards

Olivine, amphibole, ilmenite, magnetite, and spinel are also sometimes present. The term anorthosite, from Frenc anorthose (term for plagioclase) was coined by Sterry Hunt. 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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Thermal properties of soils and rocks - DiVA

Cumulate rocks typically have the same minerals about the same size. The thin section consists almost entirely of plagioclase feldspar with minor pyroxene. All grains show evidence of considerable shock caused by meteorite impact events - the black glass coating was produced at this time. Accessory minerals present include ilmenite, chromite and olivine. 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.

Ekonomisk Geologi exempel tentamenfrågor Flashcards

GRD02YCS0, Microcline, Microcline var. 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.

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.