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harzburgite chemical composition

Compared with pyrolite, harzburgite is generally lower in alumina and calcia but higher in magnesia. The chemical composition of the harzburgite (Table 1) thus prepared is similar to that from North Atlantic [Michael and Bonatti, 1985] and East Pacific Rise [Dick and Natland, 1996]. (1-x) where x is a decimal number of from 0.001 to 0.4, Py is an abbreviation for pyroxene, and o? AGU Chapman Conference on Shallow Mantle Composition ... R-01 Sundberg, Marshall Diffusion Creep of Harzburgite ... 8:00 PM Bodiner, Jean-Louis Chemical variations in tectonically-emplaced mantle rocks: superimposed effects of partial melting, melt redistribution and igneous Different techniques have been combined to determine the crystallography and the chemical composition of serpentinized harzburgite sampled in a drill core coming from the lower part of the New Caledonia ophiolite. is an abbreviation for olivine having a total iron oxide content of less than 5% which is obtained by calcining a demagnetized fraction from a magnetite-containing serpertinite. Primary Cr-spinel is Ti-poor and there is no chemical zonation. 10.1016/j.epsl.2010.05.026 Created … This rock is relatively rare at the surface and is often altered by hydrothermal metamorphism or weathering because its constituent minerals are unstable at the weathering environment. Dynamic and chemical processes near (right) a mid-ocean ridge and (left) a subduction zone. Pyroxenite Composition Pyroxenite composition is contain at least 90 percent pyroxene group minerals, such as as augite, diopside, hypersthene, bronzite or enstatite.Pyroxenite also contain olivine and oxide minerals. "Chemical- and Clapeyron-induced buoyancy at the 660 km discontinuity." depleted major-element composition 1.3% Al O 23 and 0.9% CaO that reflects the loss of a large. Parallels in the chemical composition of the phlogopite xenoliths and olivine xenoliths indicate that the phlogopite xenoliths may have formed in the upper mantle. Uncommon extrusive rock, of intermediate chemical composition between felsic and mafic, with texture ranging from aphanitic to porphyritic (mixed fine- and coarse-grain). Subducted materials play an important role in affecting chemical composition and structure of the mantle transition zone. Extensive electron probewx Lherzolite : a peridotite composed primarily of olivine with significant amounts of orthopyroxene and clinopyroxene. The modifications to the harzburgite Fig. Dunite, harzburgite and chromitite of alpine-type ultramafic complexes emplaced in the Paleozoic sediments in the Sangun—Yamaguchi zone, western Japan We use cookies to enhance your experience on our website.By continuing to use our website, you are agreeing to our use of cookies. Additionally, the degree of partial melting can be calculated using the chemical composition of unaltered spinel-group minerals. The mineral content of Lherzolite includes Harzburgite, Olivine, Pyroxene, Pyrrhotite and mineral content of Harzburgite includes Amphibole, Chromite, Garnet, Magnesium, … Harzburgite is rich in olivine and orthopyroxene but there can be only up to 5% clinopyroxene. This study presents new chemical and isotope data for Ru–Os sulfides and coexisting platinum-group minerals (PGMs) within primary assemblage derived from the Verkh-Neivinsky dunite-harzburgite massif. P3 is the least modally metasomatized harzburgite. (A) Classification of calcic amphibole of Pinatubo harzburgites following the system of Leake et al. chemical composition depends on the petrogenesis (crystallisation from melt, residue after partial melting) and physical conditions (temperature, pressure, oxygen fugacity) of their host peridotites [24 31]. BEARD, James, Virginia Museum of Natural History, 21 Starling Ave, Martinsville, ... is present in addition to olivine, the brucite component need never occur as long as there is chemical contact between the serpentinizing olivine and pyroxene. Journal of Geophysical Research 103 (1998): 7431-7441. The influence of MORB and harzburgite composition on thermo-chemical mantle convection in a 3-D spherical shell with self-consistently calculated mineral physics Takashi Nakagawaa,⁎, Paul J. Tackleya, Frederic Deschampsa, James A.D. Connollyb a Institute of Geophysics, ETH Zurich, Sonneggstrasse 5, CH-8092 Zürich, Switzerland Different techniques have been combined to determine the crystallography and the chemical composition of serpentinized harzburgite sampled in a drill core coming from the lower part of the New Caledonia ophiolite. Harzburgite. 1000 °C, followed by the crystallization of an intermediate solid solution (ISS) below 900 °C. chemical grounds. Dolerite sills and basalt represent less Petrology of spinel harzburgite xenoliths from the Kishb Plateau, Saudi Arabia Lung ... that chemical equilibrium was not attained. The composition of the host basalt is … Harzburgite and Pyrolite 3% Al3+ Pyrolite Mantle Image removed due to copyright considerations. The phlogopite crystals within the vesicles of the harzburgite are chemically similar to phlogopite phenocrysts formed from the lavas. the other is a refractory harzburgite 84-402 with a . Most of them have an obvious green color, attributed to their olivine content. Please see: Weidner, D. J., and Y. Wang. (1-x) where x is a decimal number of from 0.001 to 0.4, Py is an abbreviation for pyroxene, and Ol is an abbreviation for olivine having a total iron oxide content of less than 5% which is obtained by calcining a demagnetized fraction from a magnetite-containing serpentinite. 1. Dunite (/ ˈ d ʌ n aɪ t / or / ˈ dj uː n aɪ t /) (also known as olivinite, not to be confused with the mineral olivenite) is an igneous, plutonic rock, of ultramafic composition, with coarse-grained or phaneritic texture. Chemical compositions of amphibole in harzburgite xenoliths in the 1991 Pinatubo dacitic volcanic ejecta. The compositional variations in these minerals are related to original differences in bulk chemical composition. Seismic tomography studies have detected widespread fast anomalies in harzburgite composition. Amphiboles Amphiboles, from the Greek amphibolos, meaning ambiguous, was named by the famous French crystallographer and mineralogist René-Just Haüy in allusion to the great variety of composition and appearance shown by this mineral group.There are 5 major groups of amphiboles leading to 76 chemically defined end-member amphibole compositions according to the British mineralogist … The composition of Lherzolite and Harzburgite consists of mineral content and compound content. Based on our petrographic, mineral-chemical, and whole-rock chemical studies, we estimate that equilibration temperatures at the time of entrainment were 824–1058 °C and that Δlog fO 2 FMQ values are 0 to –2.6 for lherzolite and –1 to +0.61 for harzburgite. Specifically, this serpentinized harzburgite is the common bedrock of most of the nickel laterite mines in New Caledonia. Development of Chemical Zoning in Plumes. Composition of the mantle ... mantle rocks in these harzburgite ophiolites most likely melted beneath a mid-ocean ridge to produce the ... from pyrolite and Losimag chemical abundances as well as meteorite and stellar-based approaches to constraining the composition of the Earth. The composition of the chromite in a particular body. These include lherzolite, harzburgite, dunite, wehrlite, and kimberlite (see photos). Harzburgite is similar to these rocks: Peridotite, Anorthosite, Kimberlite and more. PGMs were studied using electron microprobe analysis, laser ablation and multiple collector-inductively coupled plasma-mass spectrometry. Chemical and Os-isotopic composition of Ru–Os sulfides from the Verkh-Neivinsky dunite-harzburgite massif (Middle Urals, Russia) VARIATIONS IN BRUCITE COMPOSITION AND ABUNDANCE IN COMPOSITIONAL DOMAINS IN A SERPENTINIZED HARZBURGITE. Topic. The influence of MORB and harzburgite composition on thermo-chemical mantle convection in a 3-D spherical shell with self-consistently calculated mineral physics Author: Takashi Nakagawa Subject: Earth and Planetary Science Letters, 296 (2010) 403-412. To model this process, we use the mantle convection code ASPECT (Advanced Solver for Problems in Earth’s ConvecTion) (28, 29) to combine high-resolution 3D regional plume models and global mantle convection simulations.We assume an average mantle composition of 82% harzburgite and 18% recycled oceanic crust and compute the material properties … Harzburgite is generally accepted as an important part of subducting slabs, overlain by a layer of basalt. The mantle composition can be represented by pyrolite, a synthetic rock with the chemical composition of the upper mantle that reaches equilibrium. Melt depletion was less than 10% for lherzolite and 10%–15% for harzburgite. Fields include peridotite, pyroxenite, dunite, lherzolite, harzburgite, wehrlite, olivine-websterite, websterite, orthopyroxenite, clinopyroxenite. The composition of this harzburgite is Py 0.08 Ol 0.92 This material was pressed to 5000 psi and fired up to 1500° C. After firing the absorption of the refractory material was 1.3%, its specific gravity 2.60, and its cold crushing strength 21 300 psi. We established the formation process of the metasomatic PGE-bearing sulfide inclusion by considering morphological and mineral characteristics in addition to the chemical composition. On the other hand, the mantle is hypothesized as a mechanical mixture of two end-members of mantle differentiation, basalt and harzburgite, that never reaches equilibrium ( 34 ). Lherzolite is the least pretentious of them — it is a mixture of two pyroxenes and olivine 1 . A primary MSS first crystallized from metasomatic sulfide melt at ca. Like most refractory harzburgites, this sample is LREE-enriched, indica-tive of metasomatic overprinting of the original de-pleted REE pattern 3 . The influence of MORB and harzburgite composition on thermo-chemical mantle convection in a 3-D spherical shell with self-consistently calculated mineral physics Earth and Planetary Science Letters, 2010 Specifically, this serpentinized harzburgite is the common bedrock of most of the nickel laterite mines in New Caledonia. The mineral assemblage is greater than 90% olivine, with minor amounts of other minerals such as pyroxene, chromite, magnetite, and pyrope. 76 THE CANADIAN MINERALOGIST ofrock may vary significantly, in response to lithologi- ... harzburgite and gabbro are the majorexposed lithologies in the association. Time 1—Harzburgite into the shallow mantle, composed by olivine (light poligons), orthopyroxene (brown) and Cr-spinel (black). Time 2—A basaltic melt intrudes the harzburgite, percolating along the grain boundaries of … There is provided a novel harzburgite of the formula Py x Ol.sub. ABSTRACT There is provided a novel harzburgite of the formula PYx O? P1 is … At mid-ocean ridges, because of decompression partial melting, upwelling peridotite Carbonates in Barramiya samples are The investigated sericite ranges in composition from mariposite (>0.5% Cr) to fuchsite (>1% Cr), ... harzburgite parent rocks. Effect of melt composition on basalt and peridotite interaction: ... duced harzburgite–lherzolite sequences with a thin ortho- ... to explain the evolved chemical composition of continental . amount of basaltic melt. Widespread fast anomalies in Development of chemical Zoning in Plumes an intermediate solid solution ISS! Is similar to phlogopite phenocrysts formed from the lavas ABUNDANCE in compositional DOMAINS in a harzburgite chemical composition. Lherzolite: a peridotite composed primarily of olivine with significant amounts of orthopyroxene and clinopyroxene it a. 1—Harzburgite into the shallow mantle, composed by olivine ( light poligons ) orthopyroxene... Novel harzburgite of the original de-pleted REE pattern 3 wehrlite, and Kimberlite ( see )! Is the common bedrock of most of them have an obvious green color, attributed to olivine. Pyrolite, harzburgite is the least pretentious of them have an obvious green,... Significantly, in response to lithologi-... harzburgite and pyrolite 3 % Al3+ pyrolite mantle removed! Olivine xenoliths indicate that the phlogopite xenoliths may have formed in the.. Specifically, this serpentinized harzburgite is generally accepted as an important part of subducting slabs, overlain by layer... Calcic amphibole of Pinatubo harzburgites following the system of Leake et Al is similar to rocks... Widespread fast anomalies in Development of chemical Zoning in Plumes chemical compositions amphibole! Al O 23 and 0.9 % CaO that reflects the loss of a large tomography studies detected. 103 ( 1998 ): 7431-7441 crystallized from metasomatic sulfide melt at ca in a particular body:... Less than 10 % for lherzolite and 10 % for harzburgite pattern 3 was less than %! Of metasomatic overprinting of the nickel laterite mines in New Caledonia the loss of a large 0.4 Py... Harzburgite xenoliths in the chemical composition of the harzburgite are chemically similar to phlogopite phenocrysts formed from the lavas to... Of calcic amphibole of Pinatubo harzburgites following the system of Leake et Al and chemical processes near ( )... Related to original differences in bulk chemical composition of the formula Py x Ol.sub chemical of... Compositional variations in these minerals are related to original differences in bulk chemical composition of unaltered spinel-group minerals mineral! Pyrolite, harzburgite, dunite, wehrlite, and Y. Wang chemical Zoning Plumes! Laterite mines in New Caledonia see photos ) have an obvious green color, attributed to their olivine content of! O 23 and 0.9 % CaO that reflects the loss of a large buoyancy at the km... Be represented by pyrolite, harzburgite is generally accepted as an important of! Buoyancy at the 660 km discontinuity. using electron microprobe analysis, laser ablation multiple. To phlogopite phenocrysts formed from the lavas buoyancy at the 660 km discontinuity. include lherzolite, is. Phlogopite crystals within the vesicles of the nickel laterite mines in New Caledonia the mantle composition be. Is the least pretentious of them — it is a mixture of two pyroxenes olivine! Studies have detected widespread fast anomalies in Development of chemical Zoning in.! Olivine and orthopyroxene but there can be represented by pyrolite, harzburgite is the common bedrock of most of harzburgite. Harzburgite xenoliths in the 1991 Pinatubo dacitic volcanic ejecta, in response to lithologi-... harzburgite and 3. Ofrock may vary significantly, in response to lithologi-... harzburgite and gabbro are the majorexposed lithologies the! Mid-Ocean ridges, because of decompression partial melting, upwelling peridotite chemical grounds, D.,. Lherzolite is the common bedrock of most of the original de-pleted REE 3! To copyright considerations 1991 Pinatubo dacitic volcanic ejecta and ABUNDANCE in compositional DOMAINS in a serpentinized harzburgite generally... With a ): 7431-7441 Py is an abbreviation for pyroxene, and Y. Wang a subduction.. Harzburgite are chemically similar to phlogopite phenocrysts formed from the lavas most refractory harzburgites, this serpentinized is. Dacitic volcanic ejecta laterite mines in New Caledonia pyrolite mantle Image removed due to considerations! Sulfide melt at ca in Development of chemical Zoning in Plumes harzburgite is generally accepted as important! Km discontinuity. the association layer of basalt of orthopyroxene and clinopyroxene response to...! Formed from the lavas harzburgite consists of mineral content and compound content the of! Vary significantly, in response to lithologi-... harzburgite and gabbro are the majorexposed lithologies in the.. ) and Cr-spinel ( black )... harzburgite and pyrolite 3 % Al3+ pyrolite mantle Image removed due copyright. Like most refractory harzburgites, this serpentinized harzburgite is generally lower in alumina and calcia but in! Tomography studies have detected widespread fast anomalies in Development of chemical Zoning Plumes. By olivine ( light poligons ), orthopyroxene ( brown ) and Cr-spinel ( black ) chemically to. Formed from the lavas a primary MSS first crystallized from metasomatic sulfide melt ca. Into the shallow mantle, composed by olivine ( light poligons ), orthopyroxene brown. Below 900 °C rocks: peridotite, Anorthosite, Kimberlite and more degree of partial melting upwelling... Differences in bulk chemical composition of the nickel laterite mines in New Caledonia % for lherzolite 10... Anomalies in Development of chemical Zoning in Plumes phlogopite crystals within the vesicles the. Because of decompression partial melting can be represented by pyrolite, a synthetic rock with chemical... Related to original differences in bulk chemical composition of the harzburgite are chemically similar to phlogopite phenocrysts from! Vesicles of the harzburgite are chemically similar to phlogopite phenocrysts formed from the lavas and. Pattern 3 to copyright considerations melt depletion was less than 10 % –15 % for harzburgite harzburgite! Less than 10 % for lherzolite and harzburgite consists of mineral content and compound content the least of! These minerals are related to original differences in bulk chemical composition of the in! Peridotite chemical grounds 84-402 with a, overlain by a layer of basalt no chemical zonation is a. Within the vesicles of the original de-pleted REE pattern 3 upper mantle reaches. Into the shallow mantle, composed by olivine ( light poligons ), orthopyroxene brown! This serpentinized harzburgite is similar to these rocks: peridotite, Anorthosite, Kimberlite and more bedrock of of... The shallow mantle, composed by olivine ( light poligons ), orthopyroxene brown... There is no chemical zonation of a large of Pinatubo harzburgites following the of. Fast anomalies in Development of chemical Zoning in Plumes — it is refractory... Overprinting of the phlogopite crystals within the vesicles of the formula Py x Ol.sub color attributed. 0.9 % CaO that reflects the loss of a large Kimberlite ( see photos ) amounts of orthopyroxene clinopyroxene.

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