websterite rock

The geology, petrology and petrogenesis of the White Hills

The White Hills Peridotite is loed at the northernmost tip of the Great Northern Peninsula of Newfoundland. The peridotite is the highest structural slice of the Hare Bay Allochthon and outcrops as three massifs (two large and one small) which may represent dissected parts of a once complete ophiolite complex tectonically emplaced during the MidOrdovician as a result of the closing of the

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Dating layered websterite formation in the lithospheric

Nov 15, 2016 · The maximum age of melt–rock reaction was estimated using the Nd, Sr and Hf isotope composition and the Sm/Nd, Rb/Sr and Lu/Hf ratios of clinopyroxene in ''distal'' lherzolite–websterite 06LI17 (Le Roux et al., 2009).). ''Distal'' lherzolite–websterite samples contain abundant websterite layers indiing that they have heavily reacted with the percolating melt.

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16. PETROLOGY AND GEOCHEMISTRY OF NODULAR

95% of the rock. Piece 2 in Section 13R2 contains an ovalshaped (3 × 4 cm) inclusion or band of olivine websterite. Contacts with the surrounding harzburgite are sharp and smooth. In contrast to the rest of the core, the inclusion consists of 57% orthopyroxene, 30% clinopyroxene, 10% olivine, and 3% spinel opaque minerals occur in trace

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Igneous rock names Flashcards Quizlet

an igneous rock (or metamorphic rock) with giant sized crystals. Peridotite. a plutonic or cumulate ultramafic rock composed of >90% olivine. Websterite. a type of pyroxenite, composed of clinoproxene and orthopyroxene. YOU MIGHT ALSO LIKE 21 terms. Igneous Rocks. 33 terms. Igneous rocks (130) 13 terms.

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Fast Facts Rocks Flashcards Quizlet

Start studying Fast Facts Rocks. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

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Exsolution of plagioclase from clinopyroxene in a

The rock comes from the second knoll eastwards Galdhopiggen, along ridge to Keilhaus Topp, at an altitude of 2250 m. The ultramafic body at this point is enclosed in pale twopyroxenefeldspar rock (jotunite and mangerite) of rather more felsic aspect than the average Jotunheim granulite facies rocks.

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Exsolution of plagioclase from clinopyroxene in a

The rock comes from the second knoll eastwards Galdhopiggen, along ridge to Keilhaus Topp, at an altitude of 2250 m. The ultramafic body at this point is enclosed in pale twopyroxenefeldspar rock (jotunite and mangerite) of rather more felsic aspect than the average Jotunheim granulite facies rocks.

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16. PETROLOGY AND GEOCHEMISTRY OF NODULAR

95% of the rock. Piece 2 in Section 13R2 contains an ovalshaped (3 × 4 cm) inclusion or band of olivine websterite. Contacts with the surrounding harzburgite are sharp and smooth. In contrast to the rest of the core, the inclusion consists of 57% orthopyroxene, 30% clinopyroxene, 10% olivine, and 3% spinel opaque minerals occur in trace

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Contrasting Group I and Group II Eclogite Xenolith

The xenolith suite contains members of most mantle rock types, including spinel peridotite, coarse and deformed garnet peridotite and eclogite, as well as a suite of Crpoor megacrysts (Schulze, 1989).The samples analysed here (Tables 1 and 2) were all collected from concentrates at the mine, and typically range in size from 2 cm to 5 cm. Individual specimens were carefully selected for

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Rocks under the Microscope Index

Rocks under the Microscope. Pictured below are some common rock types as seen under the microscope. The images are classified according to rock type (sedimentary, igneous, metamorphic). Each thumbnail has a short caption and links (by clicking on the thumbnail itself) to

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Types of Rocks List – Types List

Mar 06, 2014 · Types of Rocks List. March 6, Tuff – A very fine grained volcanic rock Websterite – A kind of pyroxenite (metamorphosis) due to pressure and heat. The type of existing rock which undergoes changes is known as protolith. Sedimentary and igneous rocks often undergo this process to become metamorphic rocks.

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Olivinewebsterite: Mineral information, data and localities.

Olivinewebsterite. Ultramaficrock. Coarsegrainedultramaficrock. Pyroxenite. Olivinepyroxenite. Olivinewebsterite. Essential minerals these are minerals that are required within the classifiion of this rock: Olivine: Equivalent to FayaliteForsterite Series usually a more or less Febearing forsterite.

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Granulitegrade garnet pyroxenite from the Kollimassif

Garnet websterite is the most abundant rocktype with a mineral assemblage of coarse grained garnet and clinopyroxene ranging in size from 0.5 mm to 2 cm. In a few domains, the garnet websterite shows feldspar coronas around garnet, indiing retrograde overprinting (see Fig. 4i). Plagioclase grains range in size from 1 to 3 mm. Spectacular

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Optical Mineralogy — Websterite in thin section

Websterite in thin section. Clinopyroxene and orthopyroxene with few anhedral plagioclase crystals in interstitial space. Opaques (oxides) also present. geochemistry geologist geology geo mineralogy magma microscope minerals mineral rocks rock websterite mafic aesthetic nature volcano plume physics petrology pretty crystals chemistry art

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Density — GPG 0.0.1 documentation

Density of Common Rocks¶ Each rock type is defined by a range of density values (not a specific value). The densities for some common rocks, minerals, and other materials are summarized below. Note that the density ranges for different rock types can overlap.

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List of rock types Wikipedia

The following is a list of rock types recognized by geologists.There is no agreed number of specific types of rocks. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type.

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Websterite Wikipedia

Websterite is ultramafic igneous rock that consists of roughly equal proportions of orthopyroxene and clinopyroxene. It is a type of pyroxenite. Websterite is named after the town Webster in North Carolina. References This article related to petrology is a stub. You can help Wikipedia by expanding it

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Geology Superstore

Geology Superstore. Global suppliers of mining tools, mineral exploration equipment, earth science rocks, fossils, minerals and gemstone specimens, gifts and polished products and a wide range of eduional material.

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Petrology of a plagioclasebearing olivine websterite from

Instead, the calculated composition of the liquid in equilibrium with the websterite''s most magnesian minerals and the bulkrock composition are more akin to those of a poorly differentiated TMORB than of NMORB parental magma.

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garnet websterite AZGS Document Repository

The suite includes eclogite, amphibolite, clinopyroxenite, garnet websterite, granulite, and spinel peridotite (Nealey and Sheridan 1989). Xenocrysts of pyroxene, amphibole, plagioclase and quartz are common in the latite (Tyner 1984), and have been interpreted as originating in

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Websterite vs Amphibolite Compare Rocks

Websterite is ultramafic and ultrabasic rock that consists of roughly equal proportions of orthopyroxene and clinopyroxene. It is a special type of pyroxenite.. Amphibolite can be defined as a granular metamorphic rock which mainly consist of hornblende and plagioclase. These rocks are composed of many distinct minerals.

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Weberite Mineral Data

Weberite Jorgensenite. Comments: SEM image of polished section of aluminofluoride vein mounted in epoxy.Bladed jorgensenite (Jor), barite (Bar) and weberite (Web) with minor quartz, bøgvadite, schorl, pyrite, galena, chalcopyrite and chalcocite.

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Websterite: Mineral information, data and localities.

Websterite. Metamorphic rock. Highgrade metamorphic rock. High P/T metamorphic rock. Ultramafic metamorphic rock. Essential minerals these are minerals that are required within the classifiion of this rock: Pyroxene > Clinopyroxene: A petrological term for Clinopyroxene Subgroup.

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websterite Wikidata

websterite (Q7978984) From Wikidata. Jump to navigation Jump to search. ultramafic and ultrabasic rock. edit. Language Label Description Also known as English: websterite. ultramafic and ultrabasic rock. Statements. subclass of. intrusive rock. 0 references. named after. Webster. 0

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Assimilation of peridotite in zoned calcalkaline plutonic

websterite, but both have concentric zoning, with olivine bearing rock types surrounded by successively more felsic pyroxenite, gabbro and diorite. In general, concentrically zoned complexes of this type may form where magma reacts with mantlederived wall rock or ultramafic cumulates. As

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Types of Rocks List – Types List

Mar 06, 2014 · Types of Rocks List. March 6, Tuff – A very fine grained volcanic rock Websterite – A kind of pyroxenite (metamorphosis) due to pressure and heat. The type of existing rock which undergoes changes is known as protolith. Sedimentary and igneous rocks often undergo this process to become metamorphic rocks.

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garnet websterite AZGS Document Repository

The suite includes eclogite, amphibolite, clinopyroxenite, garnet websterite, granulite, and spinel peridotite (Nealey and Sheridan 1989). Xenocrysts of pyroxene, amphibole, plagioclase and quartz are common in the latite (Tyner 1984), and have been interpreted as originating in

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Types of Metamorphism tulane

A rock that shows no foliation is called a hornfels if the grain size is small, and a granulite, if the grain size is large and individual minerals can be easily distinguished with a hand lens. Protolith Protolith refers to the original rock, prior to metamorphism.

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Wehrlite: Mineral information, data and localities.

Wehrlite. Modal classifiion of ultramafic rocks (after Streckeisen, 1973) Mineralogy of WehrliteHide. Essential minerals these are minerals that are required within the classifiion of this rock: Olivine: Equivalent to FayaliteForsterite Series usually a more

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Pyroxenite sandatlas

Pyroxenite is an ultramafic plutonic igneous rock. Ultramafic means that more than 90% of the rock is composed of magnesium and ironrich minerals like pyroxenes, amphiboles, and olivine. In pyroxenite the dominant mafic mineral is a pyroxene. Pyroxenite may contain up to 40% olivine. More than that means that the rock is peridotite.

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Mantle peridotite xenoliths in andesite lava at El Peñon

Mexican Volcanic Belt were brought to the surface by a Quaternary highMg siliceous andesite, a rock type usually considered too evolved to be a direct product of mantle melting. The xenoliths and megaxenocrysts from El Peñon represent lithospheric mantle affected by significant subduction of oceanic lithosphere since as early as the Permian.

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Petrology of a plagioclasebearing olivine websterite from

Instead, the calculated composition of the liquid in equilibrium with the websterite''s most magnesian minerals and the bulkrock composition are more akin to those of a poorly differentiated TMORB than of NMORB parental magma.

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What Is Websterite Websterite Features

Websterite is ultramafic and ultrabasic rock that consists of roughly equal proportions of orthopyroxene and clinopyroxene. It is a special type of pyroxenite. 1.2 History. 1.2.1 Origin. Webster, North Carolina. 1.2.2 Discoverer. Unknown. 1.3 Etymology. From the town of Webster loed in North Carolina.

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THE WEBSTERADDIE ULTRAMAFIC RING, JACKSON

fine grained diopside from this rock (Hess, 1949,p.645)'' The maximum index of refraction and the optic angle were measured by this writer on one of the large diopside crystals in the websterite. ''fhe optic angle was essentially the same as that given by Hess for the finegrained type'' The

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Tectonics Department of Geosciences

Tectonics. review of mineral and rock forming environments and the bulk composition of the earth. There are four general environments where rocks and. Websterite Orthopyroxenite Wehrlite Peridotite Olivine clinopyroxenite Pyroxenite Cpx Clinopyroxenite . 10 12 14 16 18 100 Zeolite Blueschist 300

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Granulitegrade garnet pyroxenite from the Kollimassif

Garnet websterite is the most abundant rocktype with a mineral assemblage of coarse grained garnet and clinopyroxene ranging in size from 0.5 mm to 2 cm. In a few domains, the garnet websterite shows feldspar coronas around garnet, indiing retrograde overprinting (see Fig. 4i). Plagioclase grains range in size from 1 to 3 mm. Spectacular

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Original paper Geochemistry and petrology of pyroxenite

significant, mantle rock type found in mafic–ultramafic series. Pyroxenites usually form layers, veins, or dikes in orogenic peridotites and occur as xenoliths of variable sizes and shapes in volcanic rocks. Their compositions range from orthopyroxenite through websterite to clinopyroxenite, with variable modal contents of olivine and

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Rock Name GNS Science

ROCK NAME. DESCRIPTION: Rock type. Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Valid entries: agglomerate albite granite algal limestone alkali

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Growth of subcontinental lithosphere: evidence from

title = "Growth of subcontinental lithosphere: evidence from repeated dike injections in the balmuccia lherzolite massif, Italian Alps" abstract = "The Balmuccia alpine lherzolite massif is a fragment of subcontinental lithospheric mantle emplaced into the lower crust 251 Ma ago during the final, extensional phase of the Hercynian orogeny.

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Growth of subcontinental lithosphere: evidence from

title = "Growth of subcontinental lithosphere: evidence from repeated dike injections in the balmuccia lherzolite massif, Italian Alps" abstract = "The Balmuccia alpine lherzolite massif is a fragment of subcontinental lithospheric mantle emplaced into the lower crust 251 Ma ago during the final, extensional phase of the Hercynian orogeny.

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The Geochemistry of the Whole Rock and Platinumgroup

The Geochemistry of the Whole Rock and Platinumgroup Elements in Pyroxenites of Sorkhband Ultramafic Complex, Southern Iran Alireza Najafzadeh + Department of Geology, Faculty of Science, Payame Noor University, PO BOX 193953697 Tehran, Iran Abstract. The Ordovician Sorkhband ultramafic complex is loed in southern part of Kerman Province

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Growth of subcontinental lithosphere: evidence from

title = "Growth of subcontinental lithosphere: evidence from repeated dike injections in the balmuccia lherzolite massif, Italian Alps" abstract = "The Balmuccia alpine lherzolite massif is a fragment of subcontinental lithospheric mantle emplaced into the lower crust 251 Ma ago during the final, extensional phase of the Hercynian orogeny.

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Websterite and Detail Information world of stones

Websterite and Detail Information. Websterite : Websterite is ultramafic igneous rock that consists of roughly equal proportions of orthopvroxene and clinopyroxene is a type of pyroxenite. Websterite is named after the town Webster in North Carolina.

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Density — GPG 0.0.1 documentation

Density of Common Rocks¶ Each rock type is defined by a range of density values (not a specific value). The densities for some common rocks, minerals, and other materials are summarized below. Note that the density ranges for different rock types can overlap.

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Petrological and geochemical studies of ultramafic–mafic

PDF Ultramafic and mafic rocks occur within a linear belt, trending nearly E–W along North Puruliya Shear Zone of the Chhotanagpur Gneissic Complex (CGC). These rocks are classified as gabbro

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Optical Mineralogy — Websterite in thin section

Websterite in thin section. Clinopyroxene and orthopyroxene with few anhedral plagioclase crystals in interstitial space. Opaques (oxides) also present. geochemistry geologist geology geo mineralogy magma microscope minerals mineral rocks rock websterite mafic aesthetic nature volcano plume physics petrology pretty crystals chemistry art

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Assimilation of peridotite in zoned calcalkaline plutonic

Abstract The Big Jim complex is a concentrically zoned ultramafic to felsic plutonic complex which intruded the pelitic Chiwaukum schist. Most of the major plutonic rock types (from websterite through hornblendite, gabbronorite, hornblende gabbro and diorite, to granodiorite) enclose harzburgite and metaperidotite xenoliths similar to foliated metaperidotite lenses included in the Chiwaukum

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Websterite Thin Section Microscope Slide Geosec

Thin section microscope slide of WEBSTERITE. This is an ultramafic rock consisting of clinopyroxene (green PPL) and about 10% orthopyroxene (pink PPL) with minor plagioclase feldspar. Sent to me in a batch from USA and described as a ''mystery'', source not known, but most likely USA. Some edge fragmentation in this slide.

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