Basalt Fine Porphyritic

G101 Lab 4 Igneous Rocks

G101 Lab 4 Igneous Rocks

basalt and/or porphyritic basalt; vesicular basalt; pumice; scoria; obsidian; felsic or intermediate tuff; volcanic breccia. You yourself, as an individual, must identify and prepare PowerPoint slide(s) for seven (7) different types of igneous rock. You must not have more than one (1) of the same rocks in your slides as your lab partner has. Your individual PowerPoint slide(s) must show: .

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INTRODUCTION LITHOLOGY OF LEG 29 BASALTS

INTRODUCTION LITHOLOGY OF LEG 29 BASALTS

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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IGNEOUS ROCKS Introduction textures ...

IGNEOUS ROCKS Introduction textures ...

have finegrained textures, including porphyritic, glassy, and frothy. In addition to texture, the mineral composition also determines the appropriate classifiion of an igneous rock. Determining composition of an igneous rock is not always easy, particularly because as the texture gets finer, the individual mineral grains become too small to be seen easily. In these cases, the color of a ...

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Porphyritic Basalt | Geology 1501 | ECU

Porphyritic Basalt | Geology 1501 | ECU

Porphyritic Basalt. Type: Igneous Rock: Texture: Porphyritic: Origin: Extrusive/Volcanic: Chemical Composition: Mafic: Color: Dark Gray to Black: Mineral Composition: Calcium Plagioclase, Pyroxene: Miscellaneous: Calcium Plagioclase phenocrysts in an aphanitic (Finegrained) groundmass: Tectonic Environment: Divergent Boundary or Intraoceanic hot spots : Back to list East Carolina University ...

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Possible Achondrite Meteorite Porphyritic Basalt. In study ...

Possible Achondrite Meteorite Porphyritic Basalt. In study ...

Possible Achondrite Meteorite Porphyritic Basalt. In study. 233g In study. 233g Petrographic description Under petrographic microscope, the sample is formed by phenocrysts mostly of olivine, clinopyroxene, plagioclase and in a .

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Phsysical Geology, Igneous Rocks

Phsysical Geology, Igneous Rocks

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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Giant phenocryst basalts in the deccan trap | SpringerLink

Giant phenocryst basalts in the deccan trap | SpringerLink

This paper gives an account of some unusual porphyritic basalts containing very large phenocrysts of plagioclase, averaging from 3 cm to 5 cm in length, and at places as large as 10 to 12 cm in length. These flows have been noticed at more than 20 localities, spread all over Western Maharashtra, occurring between levels of 100 feet below sea level (seen in a drill .

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METAMORPHIC ROCK CHART

METAMORPHIC ROCK CHART

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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Igneous Rocks Textures

Igneous Rocks Textures

Porphyritic This type of texture develop when conditions during cooling of a magma change relatively quickly. Porphyritic basically means the mix of groundmass (microscopic crystals) with some larger crystals. These earlier formed crystals formed slowly and remain as large crystals, whereas, sudden cooling causes the rapid crystallization of the remainder of the melt into a .

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Igneous Rock Identifiion | Physical Geology

Igneous Rock Identifiion | Physical Geology

Example: Porphyritic basalt, porphyritic andesite. Porphyry is used as a noun after the rock name if more than 50% of the rock is made of phenocrysts. Example: Basalt porphyry. Vesicular volcanic rocks: Vesicular is the adjective used to modify the name of any finegrained igneous (volcanic) rock which has vesicles (holes from gas bubbles), making a cinderlike or clinkerlike appearance ...

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What is porphyritic texture?

What is porphyritic texture?

 · Basalt has a finegrained mineral texture due to the molten rock cooling too quickly for large mineral crystals to grow; it is often porphyritic, containing larger crystals (phenocrysts) formed prior to the extrusion that brought the magma to the surface, embedded in a finergrained matrix.

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Mare Basalt, Touchstone

Mare Basalt, Touchstone

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 "highTi, Mare Basalt" and it contains an abundance of ilmenite (~13%). Although it has been .

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What is the grain size of basalt?

What is the grain size of basalt?

 · Basalt has a finegrained mineral texture due to the molten rock cooling too quickly for large mineral crystals to grow; it is often porphyritic, containing larger crystals (phenocrysts) formed prior to the extrusion that brought the magma to the surface, embedded in a finergrained matrix.

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L162 Basalt, porphyritic · 1A Collections

L162 Basalt, porphyritic · 1A Collections

Basalt, porphyritic. Title. L162 Basalt, porphyritic. Subject. Specimen Age. Carboniferous. Loion. Volcanic neck, Lion's Haunch, Arthur's Seat, Edinburgh. Description. Hand Specimen. Black, porphyritic rock comprising black clinopyroxene, grey feldspar and greenish olivine phenocrysts, in a finegrained groundmass. Thinsection. Plagioclase feldspar Phenocrysts 1 .

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What is porphyritic texture?

What is porphyritic texture?

 · Basalt has a finegrained mineral texture due to the molten rock cooling too quickly for large mineral crystals to grow; it is often porphyritic, containing larger crystals (phenocrysts) formed prior to the extrusion that brought the magma .

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Giant phenocryst basalts in the deccan trap | SpringerLink

Giant phenocryst basalts in the deccan trap | SpringerLink

This paper gives an account of some unusual porphyritic basalts containing very large phenocrysts of plagioclase, averaging from 3 cm to 5 cm in length, and at places as large as 10 to 12 cm in length. These flows have been noticed at more than 20 localities, spread all over Western Maharashtra, occurring between levels of 100 feet below sea level (seen in a drillcore) and an elevation of ...

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Porphyritic basalt

Porphyritic basalt

This altered porphyritic basalt sample is from The Battery, a ruined gun emplacement built towards the end of the 1700s during the American War of Independence, at the entrance to Old Harbour at Dunbar. It became disused by the middle 1800s and was subsequently reused as a hospital. The basalt is Carboniferous in age with 12 mm sized plagioclase phenocrysts and a .

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Geology, Petrology and Geochemistry of Volcanic Rocks ...

Geology, Petrology and Geochemistry of Volcanic Rocks ...

aphanitic basalt, porphyritic basalt, vesicular basalt, rhyolite and dolerite and an alluvial deposit. Aphanitic Basalt It is a finegrained extrusive igneous rock characterized by highly packed crystals and dominantly contains black colored minerals with some visible quartz grains (Figure 2a). It is formed on the earth's surface under faster rate of cooling from the basic lava. Small ...

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Igneous Rocks

Igneous Rocks

(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 .

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Is basalt porphyritic?

Is basalt porphyritic?

 · Is basalt porphyritic? Wiki User. ∙ 01:36:11. Add an answer. Want this question answered? Be notified when an answer is posted. 📣 Request Answer. Add your answer: Earn +20 pts. Q ...

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