Olivine in kimberlites can provide unique insights into magma petrogenesis, because it is the most abundant xenocrystic phase and a stable magmatic product over most of the liquid line of descent. In this study we examined the petrography and chemistry of olivine in kimberlites from different tectonic settings, including the Slave craton, …
Olivine is the name of a group of rock-forming minerals that are typically found in mafic and ultramafic igneous rocks such as basalt, gabbro, dunite, diabase, and peridotite. They are usually green in color and have compositions that typically range between Mg 2 SiO 4 and Fe 2 SiO 4. Many people are familiar with olivine because it is the ...
Abstract. Comparisons of structural features of olivine (α phase), spinel (γ phase), and the modified spinel (β phase) lead to predictions of possible mechanisms for the olivine → …
a–c Group 3 type olivines, see text for details on the groups, a Olivine 67 oriented normal to b axis showing the four dendrites radiating from the central core, …
Later this year, Project Vesta plans to spread a green volcanic mineral known as olivine, ground down to the size of sand particles, across one of the beaches. The waves will further break down ...
Olivine is an important rock-forming mineral and is common in mafic igneous rocks such as peridotite, gabbro, and basalt, along with pyroxene and plagioclase. The …
Olivine is a common rock-forming mineral in mafic and ultramafic igneous rocks, but it also occurs in impure metamorphosed carbonate rocks (picture below). It is a very common mineral in the mantle. Some xenoliths from the mantle are almost entirely composed of this mineral. Such a rock type is known as dunite.
GEOLOGY OF THE JINCHUAN DEPOSIT. The Jinchuan ultramafic intrusion contains more than 500 million tonnes of sulphide ores with 1·1 wt % Ni and 0·7 wt % Cu (Tang & Li, 1995; Li & Ripley, 2011).It is one of the three largest magmatic sulphide deposit camps and the largest single magmatic sulphide deposit in the world (Naldrett, …
Amphibole peridotite samples from Åheim, Norway, were analyzed to understand the deformation mechanism and microstructural evolution of olivine and amphibole through the Scandian Orogeny and subsequent exhumation process. Three Åheim amphibole peridotite samples were selected for detailed microstructural analysis. …
Silicates with M 2 SiO 4 formula and olivine-structure, where M is mainly Mg and Fe, and containing small amounts of Mn, Ni, Co and Ca, are of fundamental importance in geology and mineralogy, as they are predominant minerals in the crust and upper mantle of the Earth. The olivine structure is one of the most robust crystallographic arrangements, …
Concentrations of Trace Elements in Olivine. The analyses of olivine phenocrysts and glasses determined by various analytical techniques are presented in Table 1 and Supplementary. The composition of the olivine cover a wide range of the Mg mole fraction (Fo concentration), which allowed us to identify the general variation trends in the …
olivine, any member of a group of common magnesium, iron silicate minerals.. General considerations. Olivines are an important rock-forming mineral group. Magnesium-rich olivines are abundant in low-silica mafic and ultramafic igneous rocks and are believed to be the most abundant constituent of the Earth's upper mantle. Olivine …
INTRODUCTION. Kimberlite, as illustrated in Figs 1 and 2, is a rock dominated by olivine.Most kimberlites are highly altered and their primary textures are poorly preserved, but rare examples, such as the sample from the Kangamiut region of Greenland shown in Fig. 1, contain about 50% of large fresh olivine grains, which are set …
We deformed aggregates of Fe-free olivine +20 vol% diopside in pure shear to study olivine grain morphology and fabric during diffusion creep. Various 3D grain …
Olivine, one of the first minerals to be altered by weathering, is a group of silicate minerals that have a general chemical composition of A 2 SiO 4. Olivine is a magnesium iron silicate and a ...
Olivine–plagioclase reaction coronas are almost ubiquitous in the olivine-bearing intrusions associated with the Nova–Bollinger Ni–Cu–Co sulfide ore deposits in the Albany–Fraser Orogen in Western Australia (Barnes et al., 2020b).Detailed studies of the sulfide ores show that they were emplaced under conditions where the country rocks …
Olivine was first directly observed in the Nili Fossae region by Hoefen et al. . They ... simplex routine to optimally update the parameter set. The function to be fitted is an asymmetric Gaussian shape: (1) The parameter set includes the centroid λ 0, amplitude α, half width half maximum (HWHM) σ, and the asymmetry parameter χ. The ...
Abstract. Experimental homogenization of olivine-hosted melt inclusions representative of near-primary basic and ultrabasic magmas is a powerful approach to investigate the nature of their source regions and the melting conditions in Earth's mantle. There is growing evidence that the total CO2 contents of olivine-hosted melt inclusions …
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114 Reviews. $31 to $50. Italian. Top Tags: Great for scenic views. Good for special occasions. Fancy. Welcome to Olivine, a new oceanfront culinary destination where the natural bounty of Maui is perfectly paired with the art of coastal Italian cuisine. Named after one of Maui's primary minerals, Olivine is a celebration of earth's renewal ...
Figure 3. BSE images of experimental olivine at different times and temperatures showing processes of growth and ripening. Panels (A,C,G) and (B,D,H) display shorter and longer experimental durations for each undercooling, respectively. Sections elongated along the c-axis in panels (C,D,G,H) are commonly observed in 2D. However, 3D scans reveal that …
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The olivines used in this work were a Foe6 (specimen 199) and a Fogl (RH9) from unit B of the Western Layered Series and unit l0 of the Eastern Layered Series, respectively, of …
The olivine minerals are characteristic of mafic and ultramafic rocks found beneath the Earth's crust, in the upper 400 km of the Earth's mantle. At mantle depths, these rocks fall into 3 natural classes: dunites, peridotites and eclogites. Dunite is dominated by olivine, and the olivine is typically > 92% forsterite.
Olivine is typically associated with calcic plagioclase, magnesium-rich pyroxenes, and iron-titanium oxides such as magnetite and ilmenite. This mineralogical association is diagnostic of the relatively high temperatures of crystallization of mafic rock types. Forsterite and protoenstatite crystallize together from about 1,550° C to roughly ...
Olivine Group M 2 TO 4 The structure of olivine can be expressed in the form M 2 TO 4, where independent TO 4 tetrahedra are linked by predominantly divalent ions. M can be a wide range of metal cations, and the TO 4 anion may be a silicate, phosphate, borate, arsenate, berylate or even more exotic combinations. Several minerals with the more ...
The sampling depth of spinel-facies peridotites is obtained by olivine-spinel thermobarometry, taking into account post-melting subsolidus processes and pre-emplacement thermal disturbance, using an empirical correction for the Ca content in olivine, which yields a pressure range of 1.1–2.0 GPa. The V contents (92–116 μg/g) and …
The Olivine from Pakistan used in this study (blue) displays similar peak positions and heights to that of San Carlos olivine (gray) that was exposed to similar experimental conditions in Tielke et al. . The starting material of natural olivine from Pakistan (red) is essentially anhydrous as is most olivine from San Carlos Arizona.
Olivine, any member of a group of common magnesium, iron silicate minerals. Olivines are an important rock-forming mineral group. Magnesium-rich olivines are abundant in low-silica mafic and ultramafic …
Hydrogen loss from olivines in mantle xenoliths from Simcoe (USA) and Mexico: Mafic alkalic magma ascent rates and water budget of the sub-continental lithosphere. …
Olivine group minerals, belonging to the isolated tetrahedra silicate subclass, all have similar atomic arrangements. By far, the most important mineral of this …
Volume 1. David Alderton, in Encyclopedia of Geology (Second Edition), 2021. Introduction. Olivine is an important rock-forming mineral and is common in mafic igneous rocks such as peridotite, gabbro, and basalt, along with pyroxene and plagioclase. The ultramafic rock dunite consists almost entirely of olivine, and is the result of the fractional …
Experiments were performed from 950 to 1250 °C and 1.5–2.4 GPa to determine the effect of pressure (P) on the temperature (T)-dependent partitioning of Al between olivine and spinel, using mixtures of natural spinel, olivine, clino- and ortho-pyroxene. When compared to 100 kPa experiments, the results show that there is no …
Orthorombic. (Mg, Fe)2[SiO4] Olivine is a ferromagnesian nesosilicate that occurs in mafic and ultramafic rocks in the Earth's crust. It is the most abundant mineral in the Earth's mantle, constituting more than 50% of …
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