بيت /basalt fine porphyritic
Finegrained, porphyritic basalt contains glomeroporphyritic clumps of plagioclase (up to 2 mm long) and olivine. Interstitial material are composed of plagio clase, titanoaugite, olivine and oxide mesostasis. Analytical data: K = %; '^°Ar* = x 10"^^ moles/g; '^°Ar* = %. (whole rock) ± Ma 13 79H8 KAr Emmigrant Basalt, same as 79H85 (above). lytical data: K = ...
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If a rock falls in one of the above egories on the chart but is porphyritic (visible crystals in a fine grained groundmass or matrix) it is given a compound name, for example, granite porphyry (or porphyritic granite), and basalt porphyry (or porphyritic basalt). For more information see the Geology of Michigan, 1991; Dorr Eschman, University of Michigan Press, Ann Arbor, Michigan. Rock ...
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Basalt is a finegrained, darkcolored mafic volcanic rock composed of plagioclase, ortho or clinopyroxene, minor FeTi oxides, with or without olivine. Largegrained (porphyritic) samples contain large crystals (phenocrysts) of olivine, pyroxene, or plagioclase dispersed in a finegrained matrix glassy matrix, or groundmass. Gasrich samples contain abundant vesicles. .
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It looks like porphyritic basalt. My answer is based on the blocky characteristics of the white mineral (feldspar) in a dark matrix (black finegrained material). My be given a different name depending on chemical makeup. 8. Share. Report Save. level 2 · 4y. geo, geochem. Looks intrusive. Probably diabase as opposed to porphyry. 6. Share. Report Save. Continue this thread level 2 · 4y. I ...
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(aphanitic, phaneritic, porphyritic, vesicular, glass) and their mineral composition. 2. Describe how the rate of ... •Quick cooling = fine grains . Igneous rocks are classified based on their:texturecomposition Igneous textures 1. Glassy instantaneous cooling Obsidian= volcanic glass. Igneous textures 2. Aphaniticfine grain size (< 1 mm); result of quick cooling Basalt ...
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porphyritic finegrained basalts toward the base of the core. The basalts of Core 13, Section 1, and Core 13, Section 2 are in lithic continuity with the vesicular basalts of Core 12, Section 1, but differ from them in their slightly coarser grain size and lack of vesicles and phenocrysts. The nonvesicular basalts are subfriable, and during drilling many of the short core segments were abraded ...
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Porphyritic rocks exhibit grains (crystals) in two, or more, sizes (or populations). The larger sized crystals are called phenocrysts. Phenocrysts are always large enough to be seen by the eye without magnifiion. By definition, phenocrysts are phaneritic. The smaller sized crystals between the larger sized crystals constitute the groundmass. Crystals of the groundmass may be visible to the ...
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Finegrained porphyritic basalt flows; dip 35° west. Interbedded with sediments of Ricardo Formation and fanglomerate of Funeral Formation. Crosssectional thickness 0 to 1,000 ft (Samsel, 1962). Basalt flows, dikes, and sills, interbedded with pyrociastics of Kinnick Formation and siltstone of Bopesta Formation; dip 35° northwest; weathers to sandsized fragments. .
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The basal part of the Duffer Formation (Fig. ) comprises interbedded massive, pillowed to tuffaceous basalt and massive to graded, coarse to finegrained plagioclase porphyritic andesite and dacite. Two compositional types of basalts are recognized. Duffer B1 basalts are tholeiitic and compositionally similar to the Mount Ada Basalt; they are typically plagioclase .
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· Basalt (porphyritic); dark grey green, fine to medium grained, moderately chlori tized, weakly porphyritic basalt. Dark ' grey to green, anhedral mafic (amphibole) phenocrysts up to 3 mm. are present. Magnetic. Flow Breccia: weakly developed flow breccia contains grey green, angular frag ments up to 3 cm. in a dark green chlori tized matrix. Locally folded at 40 dtca at The contact 47 ...
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The vesicular porphyritic basalt is the most abundant rock type in the studied scoria. It is composed from glassy groundmass contains abundant plagioclase and clinopyroxene phenocrysts with less frequent opaques (magnetite and ilmenite). The vesicular texture is the most dominant where the vesicles are filled with calcite and quartz (Fig. 5C). The plagioclase is present either as finegrained ...
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Porphyritic andesite: Porphyritic basalt: Fine grained and vesicular or amygdaloidal: Vesicular or amygdaloidal andesite: Vesicular or amygdaloidal basalt: Pyroclastic: Rhyolite tuff or breccia: Andesite tuff or breccia: Basalt tuff or breccia: Glassy: Obsidian: Obsidian: Glassy with many small vesicles: Pumice : Pumice: Scoria: Last modified: Mon Jan 29 14:10:54 CST 2001 ...
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Porphyritic basalt komatiite resembles basalt but has. Porphyritic Basalt KOMATIITE (resembles basalt but has 1 ‐ 10 cm long criss ‐ crossing needles of olivine or pyroxene) Extrusive Aphanitic: fine ‐ grained RHYOLITE ANDESITE BASALT Glassy OBSIDIAN Vesicular PUMICE (abundant, tiny vesicles ‐ like meringue; very lightweight; white or ...
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Basalt: Fine grained and porphyritic: Porphyritic basalt: Pyroclastic: Basalt tuff or breccia: Vesicular: Vesicular basalt: Amygdaloidal: Amygdaloidal basalt: Many small vesicles: Scoria: Glassy: Tachylyte, sideromelane, palagonite: Related pages. List of minerals; Granite This page was last changed on 12 January 2018, at 06:56. Text is available under the Creative Commons Attribution/Share ...
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Lunar sample 70215 is a dense, finegrained porphyritic mare basalt that has been used to create "touchstones" for public display (see list under Processing). It was collected about 60 m from the Lunar Module and is one of the largest stones returned from the Moon. Neal and Taylor (1993) alogued 70215 as a "high basaltporphyry Uni Salzburg. Porphyry is an igneous, .
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Basalt A dark, finegrained, phenocrystfree rock. The crystals are too small to identify, so the basalt rock type is inferred from its dark color, which indies that it is rich in mafic minerals. Porphyritic basalt This example has abundant olivine phenocrysts, with smaller amounts of white plagioclase. There are lots of small bubbles, but no big ones. Andesite This volcanic rock has a fine ...
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Basalt has a . finegrained. mineral texture due to the molten rock cooling too quickly for large mineral crystals to grow, although itoften is porphyritic, containing the larger crystals formed prior to the extrusion that brought the lava to the surface, embedded in a finergrained matrix. Figure . : ...
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The vesicular porphyritic basalt is the most abundant rock type in the studied scoria. It is composed from glassy groundmass contains abundant plagioclase and clinopyroxene phenocrysts with less frequent opaques (magnetite and ilmenite). The vesicular texture is the most dominant where the vesicles are filled with calcite and quartz (Fig. 5C). The plagioclase .
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Porphyritic textures develop when conditions during cooling of a magma change relatively quickly. The earlier formed minerals will have formed slowly and remain as large crystals, whereas, sudden cooling causes the rapid crystallization of the remainder of the melt into a fine grained (aphanitic) matrix. The result is an aphanitic rock with some larger crystals .
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PORPHYRITIC TEXTURE an igneous rock in which PHENOCRYSTS (large crystals) are surrounded by a fine groundmass (very small crystals). This shows that the large crystals had a chance to form in a magma while it was migrating and cooling. GLASSY TEXTURE (caused by rapid cooling); fresh fractures display a conchoidal fracture like broken glass. An igneous rock .
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· The basalt clasts can be texturally subdivided into four types: poikilitic, subophitic, porphyritic and equigranular. Poikilitic (about 40%) and .
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Basalt is a finegrained, darkcolored mafic volcanic rock composed of plagioclase, ortho or clinopyroxene, minor FeTi oxides, with or without olivine. Largegrained (porphyritic) samples contain large crystals (phenocrysts) of olivine, pyroxene, or plagioclase dispersed in a finegrained matrix glassy matrix, or groundmass. Gasrich samples contain abundant vesicles. Basalt contains 45–52 ...
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Basalt has several textural varieties such as glassy, massive, porphyritic, vesicular, scoriaceous. In the Keweenaw we can subdivide textures into three types, following Huber's example: Porphyrite, Trap and Ophite, applies ideally to Isle Royale, but works for the PLV on the Keweenaw too. Porphyrite or porphyritic basalt is characterized by obvious crystals, usually .
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