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Geological interpretations from the PGE distribution in

be pegmatitic and often contains olivine (Viljoen et al., 1986a, 1986b). Very occasionally there is an intermediate chromitite layer that will also carry minor mineralization. Above the top chromitite is a pyroxenite grading into a norite. In most cases the best mineralization occurs in the top metre associated with, and below, the top

On the chemical markers of pyroxenite contributions in

Based on varying partition coefficients during partial melting related to the abundance of olivine in the source, bulk-rock geochemical indices of pyroxenite versus peridotite (i.e., MORB-like

On the chemical markers of pyroxenite contributions in

CHANGE OF ADDRESS FORM - e SGA

pyroxenite bands, pyroxenite and perido-tite, olivine gabbro, peridotite-pyroxeni-te layers, and gabbronorite (Ballhaus and Glikson, 1989). A 500m diamond drillhole through parts of the Wingellina Hills in-trusion by Acclaim Exploration in 2003 intersected, between 250 and 506 m below surface, peridotite and olivine gabbronorite overlying a

Trapped Liquid, Paleo-porosity and Formation Time Scale of

UG3a hanging-wall olivine-pyroxenite. The hanging wall of UG3a is a coarse-grained (mm to cm scale) olivine pyroxenite (melanorite), which grades into plagioclase-bearing harzburgite up-section ( Fig. 4 c). The harzburgite contains opx and up to 30 vol. % partly serpentinized olivine as cumulus minerals, both typically 1–2 mm in size ( Fig. 4

Microcracks in ultrabasic rocks under uniaxial compressive

Samples of dunite, pyroxenite, olivine basalt and of a dolerite quarry waste material were previously subjected to ball milling to produce ultrafine powders with enhanced CO2 uptake

Microcracks in ultrabasic rocks under uniaxial compressive

Petrogenesis of the Merensky Reef in the Rustenburg

A petrogenetic model for the Merensky Reef in the Rustenburg section of the Bushveld Complex has been developed based on detailed field and petrographic observations and electron microprobe data. The model maintains that the reef formed by reaction of hydrous melt and a partially molten cumulate assemblage. The model is devised to account for several key observations: (1) Although the dominant

Identification and Assessment of Asbestos Emissions From

and olivine in the igneous rocks pyroxenite, peridotite, and dunite. ... The emissions from the material piles are estimated to be small compared to stack emissions. ... of the intruded rocks. ZnS, an important ore mineral of zinc. A body of plutonic rock that covers less than 40 square miles, has steep contacts, and is generally

Poikilitic Textures, Heteradcumulates and Zoned

The complex is primarily made up of pyroxenite and its metamorphosed amphibolite-facies equivalent, with lesser amounts of olivine orthopyroxenite, peridotite (dominantly harzburgite), minor websterite and xenolith-bearing gabbroic rocks, which have granoblastic to poikilitic textures in some places

Poikilitic Textures, Heteradcumulates and Zoned

ULTRAMAFIC ROCKS IN BRITISH COLUMBIA:

Le Maitre, 1989). Ol-olivine; Opx-orthopyroxene; Cpx-clinopyroxene. The general term peridotite is used when the olivine content is 40-100%, whereas pyroxenite refers to an olivine content of 0-40%. For example, dunite is a peridotite containing 90-100% olivine. ULTRAMAFIC COMPLEXES Ultramafic complexes can be divided into three major

Platinum Mining at Rustenburg | Johnson Matthey

All footwall norite and Merensky pyroxenite of sortable size is picked out and thrown back on to the face scatter-pile. The ore remaining is then shovelled 30 feet down dip and 10 feet up dip to the panel track, where it is loaded into ⅓-ton cars, trammed along the gully track and tipped into the

U–Pb geochronology documents out-of-sequence

Nov 14, 2016 g shows stacked pyroxenite sills separated by anorthosite (24.633 S, 30.197 E), with the pyroxenites of the Lower Zone above in the distance. The rock face is about 3

U–Pb geochronology documents out-of-sequence

ROCKS and how to identify them.ppt - University of

of square miles. The volcanoes that produce basaltic lavas are relatively quiet, such as the Hawaiian Islands volcanoes. Basalt is dark, fine-grained and often vesicular (having gas pockets). The pockets may be filled with secondary minerals, e.g. quartz, zeolite minerals, calcite, opal, etc. and then it is called amygdaloidal (a-mig-duh-loy

Low‐productivity Hawaiian volcanism between Kaua‘i and

Sample 305-04 is of particular interest because it has olivines with the highest NiO, and whole-rock composition with the lowest 206 Pb/ 204 Pb and high SiO 2 (51.7 wt %) [this sample has multiple olivine populations suggesting it picked up olivine, probably from the cumulate pile, as found on other Hawaiian volcanoes (Kīlauea [Clague et al

The geology of North-East Ireland: Written for the Summer

The biotite-pyroxenite grades on its eastern side through shonkinitic monzonite and monzonite to syenite, which occurs in contact with the Sediments. The biotite-pyroxenite is black in colour and grades to shonkinitic monzonite by the appearance of a fine-grained grey felspathic matrix, in which the augite appears as phenocrysts

The geology of North-East Ireland: Written for the Summer

The oxidation state of vanadium in titanomagnetite from

Within the stringer zone, chlorite 2 (Chl-2) in the vein-veinlets and chlorite 1 (Chl-1) in the chloritized alkali olivine basalt rock are chemically indistinguishable, with 26.92 to 34.67 wt% FeO

Fact of the Day - Page 34 - Forum Games - Kametsu

Jun 09, 2020 Fact of the Day - ELEANOR ROOSEVELT. Did you know... that Anna Eleanor Roosevelt was an American political figure, diplomat and activist? She served as the First Lady of the United States from March 4, 1933, to April 12, 1945, during her husband President Franklin D. Roosevelt's four terms in office, making her the longest-serving First Lady of the United States

Gladstone Gold Mine (W.E.G.), Niagara, Kookynie Goldfield

Gladstone Gold Mine (W.E.G.), Niagara, Kookynie Goldfield, Menzies Shire, Western Australia, Australia : The original prospectors could not be located, or much information under the Gladstone name, although plenty as W.E.G. No source explained what the acronym stood for. The mine had a chequered career

Gladstone Gold Mine (W.E.G.), Niagara, Kookynie Goldfield

G Journal of Geology & Geophysics Rasool et al, Geol

Cumulate gabbro grades from olivine gabbro to olivine norite to gabbro, with 1-12 vol% olivine and 30-68 vol% of plagioclase. In olivine gabbro, clinopyroxene occurs as large adcumulus crystals and large anhedral grains that contain many olivine inclusions. Homogenous gabbros are coarse to medium garined, hypiodiomorphic granular texture

(PDF) Low-productivity Hawaiian volcanism between Kaua

The composition and distribution of the rejuvenated component across the Hawaiian plume: Hf-Nd-Sr-Pb isotope systematics of Kaula lavas and pyroxenite xenoliths By Marc Norman Sr, Nd, Hf and Pb isotope systematics of postshield-stage lavas at Kahoolawe, Hawaii

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