harzburgite chemical composition

. The investigated sericite ranges in composition from mariposite (>0.5% Cr) to fuchsite (>1% Cr), ... harzburgite parent rocks. harzburgite composition. 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. Harzburgite is similar to these rocks: Peridotite, Anorthosite, Kimberlite and more. 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. 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. 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. Petrology of spinel harzburgite xenoliths from the Kishb Plateau, Saudi Arabia Lung ... that chemical equilibrium was not attained. 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. 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 Dynamic and chemical processes near (right) a mid-ocean ridge and (left) a subduction zone. The composition of Lherzolite and Harzburgite consists of mineral content and compound content. The mineral content of Lherzolite includes Harzburgite, Olivine, Pyroxene, Pyrrhotite and mineral content of Harzburgite includes Amphibole, Chromite, Garnet, Magnesium, … At mid-ocean ridges, because of decompression partial melting, upwelling peridotite Harzburgite is generally accepted as an important part of subducting slabs, overlain by a layer of basalt. Harzburgite is rich in olivine and orthopyroxene but there can be only up to 5% clinopyroxene. The mantle composition can be represented by pyrolite, a synthetic rock with the chemical composition of the upper mantle that reaches equilibrium. Specifically, this serpentinized harzburgite is the common bedrock of most of the nickel laterite mines in New Caledonia. A primary MSS first crystallized from metasomatic sulfide melt at ca. Chemical and Os-isotopic composition of Ru–Os sulfides from the Verkh-Neivinsky dunite-harzburgite massif (Middle Urals, Russia) The compositional variations in these minerals are related to original differences in bulk chemical 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 … ABSTRACT There is provided a novel harzburgite of the formula PYx O? VARIATIONS IN BRUCITE COMPOSITION AND ABUNDANCE IN COMPOSITIONAL DOMAINS IN A SERPENTINIZED HARZBURGITE. Parallels in the chemical composition of the phlogopite xenoliths and olivine xenoliths indicate that the phlogopite xenoliths may have formed in the upper mantle. Harzburgite. (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. The mineral assemblage is greater than 90% olivine, with minor amounts of other minerals such as pyroxene, chromite, magnetite, and pyrope. These include lherzolite, harzburgite, dunite, wehrlite, and kimberlite (see photos). Lherzolite is the least pretentious of them — it is a mixture of two pyroxenes and olivine 1 . Dolerite sills and basalt represent less 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. 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 Author: Takashi Nakagawa Subject: Earth and Planetary Science Letters, 296 (2010) 403-412. the other is a refractory harzburgite 84-402 with a . depleted major-element composition 1.3% Al O 23 and 0.9% CaO that reflects the loss of a large. Development of Chemical Zoning in Plumes. Seismic tomography studies have detected widespread fast anomalies in Primary Cr-spinel is Ti-poor and there is no chemical zonation. 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. Carbonates in Barramiya samples are 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. 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 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. 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. Most of them have an obvious green color, attributed to their olivine content. (1-x) where x is a decimal number of from 0.001 to 0.4, Py is an abbreviation for pyroxene, and o? 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 Compared with pyrolite, harzburgite is generally lower in alumina and calcia but higher in magnesia. 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. amount of basaltic melt. chemical grounds. P3 is the least modally metasomatized harzburgite. 76 THE CANADIAN MINERALOGIST ofrock may vary significantly, in response to lithologi- ... harzburgite and gabbro are the majorexposed lithologies in the association. Specifically, this serpentinized harzburgite is the common bedrock of most of the nickel laterite mines in New Caledonia. The modifications to the harzburgite Fig. 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]. 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 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]. Uncommon extrusive rock, of intermediate chemical composition between felsic and mafic, with texture ranging from aphanitic to porphyritic (mixed fine- and coarse-grain). Lherzolite : a peridotite composed primarily of olivine with significant amounts of orthopyroxene and clinopyroxene. P1 is … 10.1016/j.epsl.2010.05.026 Created … Please see: Weidner, D. J., and Y. Wang. Subducted materials play an important role in affecting chemical composition and structure of the mantle transition zone. 1. 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 … The composition of the host basalt is … Additionally, the degree of partial melting can be calculated using the chemical composition of unaltered spinel-group minerals. Harzburgite and Pyrolite 3% Al3+ Pyrolite Mantle Image removed due to copyright considerations. There is provided a novel harzburgite of the formula Py x Ol.sub. The phlogopite crystals within the vesicles of the harzburgite are chemically similar to phlogopite phenocrysts formed from the lavas. Melt depletion was less than 10% for lherzolite and 10%–15% for harzburgite. Time 2—A basaltic melt intrudes the harzburgite, percolating along the grain boundaries of … Journal of Geophysical Research 103 (1998): 7431-7441. "Chemical- and Clapeyron-induced buoyancy at the 660 km discontinuity." Time 1—Harzburgite into the shallow mantle, composed by olivine (light poligons), orthopyroxene (brown) and Cr-spinel (black). The composition of the chromite in a particular body. Topic. (A) Classification of calcic amphibole of Pinatubo harzburgites following the system of Leake et al. Chemical compositions of amphibole in harzburgite xenoliths in the 1991 Pinatubo dacitic volcanic ejecta. Extensive electron probewx We established the formation process of the metasomatic PGE-bearing sulfide inclusion by considering morphological and mineral characteristics in addition to the chemical composition. 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. 1000 °C, followed by the crystallization of an intermediate solid solution (ISS) below 900 °C. PGMs were studied using electron microprobe analysis, laser ablation and multiple collector-inductively coupled plasma-mass spectrometry. 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 ).

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