(110) is a very poor cleavage and is not usually seen in thin section. Cleavages intersect Photomicrograph of plagioclase in anorthosite (BV106) in plane light.

Anorthosite is an almost monomineralic, feldspathic rock with a great variety of industrial applications (Table 1). Anorthosite massifs are known to host important ore depos-its such as ilmenite and are, in many cases, excellent sources for high-quality rock aggregate and also for dimension-stone. The exploitation of anorthosite for industrial

Anorthosite. Cordierite. 2. T h i s.

Anorthosite thin section

The section is normal to the foliation and in the same plane as (a). (c) Section from the interior of an oikocryst into the matrix, digitized from photographs of three large thin sections, parts of two of which are shown in (a) and (b). Rocks under the Microscope. Some common rock types as seen under the microscope. These are photomicrographs - very thin slices of rock, seen in plane-polarised light, or between crossed polarisers, when the colours seen are produced by interference of light. This is a thin section of one of a series of specimens very kindly sent to me from USA. Many thanks to the donor! This has come from an area dominated geologically by a large pre-cambrian anorthosite intrusion.

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.

in Fennoscandia; Baddeleyite U Pb dating of a suite of massif-type anorthosite in S. Sweden. The Laxemar subarea is dominated by the porphyritic Ävrö granite 5.2 Modal analyses Modal analyses of thin-sections have been carried out on 51 30 Diorite Gabbro Anorthosite P 10 Quartz monzodiorite Quartz monzogabbro Area Number of sites 21 11 10 42 1 1 1 4 1 2 1 1 1 1 TBT µg/kg dry weight 186 Lager 1986) and microbial layering has been recognised in thin section from in the south-central part, consisting of olivine bearing leucogabbro to anorthosite. The stone tables are made of marble, gabbro and anorthosite. A polished thin section of c millimetres is sampled from a rock and examined with a polarising 3 Citations · Petrographic study of high-grade gneisses, Halland area · Diana Carlsson · Peat stratigraphical study of hydrological conditions at Stass Mosse, Anorthosite Personeriasm humility.

2. ANORTHOSITE white course grained plagioclase MT. 3. APALITE fine pink CO. 4. BASALT olivine, La Bajada Hill NM Quarternary. 5. BASALT scoriaceous NM recent flow. 6. BRECCIA volcanic light grey CO. 7. BRECCIA marble variegated, Italy. 8. BRECCIA sedimentary CA. 9. BRECCIA andesite grey CO. 10. BRECCIA chert in silica dolomite matrix . 11

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. 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.

NASA photo S72-48821. [ RIGHT ] Microscope image in linear polarized light of a thin-section showing a spinel-rich clast in lunar meteorite ALHA81005. The Bethampudi layered anorthosite complex at the border zone of Archaean supracrustal rocks of Khammam district, Eastern Ghats shows normal stratification predominantly in the form of rhythmic layering and often exhibits of zebra layering. Graded bedding and cumulate structures are also noticed. The rocks of the study area are classified based on petrography into anorthositic rocks, gabbroic This file is licensed under the Creative Commons Attribution 2.0 Generic license.: You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.
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Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present. Anorthosites are of enormous geologic interest, because it is still not fully understood how they form. Most models involve separating plagioclase crystals based on their density. Plagioclase crystals are usually less dense than magma; so Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Small “clumps” of mafic minerals are in the hand specimen, but these are not represented in the thin sections.

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.
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Anorthosite. Intrusive igneous, plutonic . 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

Gabbros and norites are found in sills, dikes, stocks, lopoliths, and other bodies. The 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.

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behaviour of plagioclase is assessed from analyses of three anorthosite units deformed polished thin sections using a JEOL Superprobe JXL. 8200 at the

Famous for its complete ring dyke made of Eucrite, a similar gabbro. This sample was collected from a Part of the Hypersthene gabbro at Sanna Point. Jan 19, 2017 - Photomicrograph of a thin section showing twinned, aligned plagioclase in anorthosite. A coarse grained igneous rock, anorthosite is characterized by being … The anorthosite-mangerite-charnockite-granite (AMCG) suite of rocks in North America is typically regarded as an association of two rock suites that are coeval but not comagmatic (Emslie et al., 1994; McLelland et al., 1994; Bickford et al., in press).The anorthosite suite is regarded as consisting of comagmatic anorthosite, leucogabbro, and gabbro, plus OGN and OAGN, while the mangerite suite anorthositic material. While cooling to form a solid body, parts of the interior melted again to form lava flows on the front side. The heat for the first melting comes from the terminal accretion; the heat for the second melting comes from the radioactive decay of K, U and Th in the interior. 11 clasts and studied thin sections of them.