Olivine - an overview | ScienceDirect Topics Olivine is an important rock-forming mineral and occurs 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 crystallisation of peridotite-composition melts to form cumulate olivine
Olivine formation processes and fluid pathways in subducted . . . Olivine from all samples examined shows no deformation-related variations in its major element composition and has a high Mg# of 94–96, except for sample ZS-43 from UTG, which has a Mg# of 92 While olivine is generally homogeneous in composition in most samples from both outcrop parts, some minor zoning is observed
Feasibility of increasing marine carbon storage through olivine . . . The olivine dissolution rate (R CO 2) [63] can be expressed as: (8) R CO 2 = γ CO 2 net R olivine diss (9) R olivine diss = k olivine diss A surface C olivine Where γ CO 2 net refers to the net amount of CO 2 absorbed from the atmosphere during the dissolution of 1 kg of olivine on the seafloor, which varies between 0 5 and 1 0 depending on
Minor and trace elements in olivines as probes into early igneous and . . . Olivine has a special status in our understanding of the Earth’s upper mantle and of the origin and evolution of mantle melts It is the most common mineral constituent of peridotite, making up 50 to >90% of the rock, and is also the first silicate mineral to crystallize from almost all primary mantle-derived melt compositions
Olivine chemistry reveals compositional source heterogeneities within a . . . Olivine in primitive Icelandic basalts record a variation in Ni and Mn concentrations between 990-3060 ppm and 1010–2174 ppm, respectively, whereas Ca contents range from 1532 to 2774 ppm (Fig 2) This is in good agreement with the olivine dataset published by Nikkola et al (2019)
Olivine-catalyzed glycolaldehyde and sugar synthesis under aqueous . . . The olivine dissolution also maintained the solution at an elevated pH compared to solutions lacking olivine, which promoted further progression of the reaction As demonstrated here, neither glycolaldehyde nor calcium hydroxide alone proved as effective in initiating, catalyzing, and buffering the entire formose reaction as olivine
Olivine dissolution rates: A critical review - ScienceDirect Olivine is composed of SiO 4 4− anions and Me 2+ cations with a 1:2 M ratio of Si:Me A major structural feature of olivine is that these Me 2+ cations are situated in octahedral chains that run parallel to the c-axis (see Brown, 1980; Putnis, 1992) A schematic illustration of the olivine structure viewed along the a-axis is reported in Fig
A comprehensive study on the leaching characteristics and mechanisms of . . . Forsterite, a type of olivine, has a high melting point of 1890 °C, while iron-bearing olivine, also known as fayalite, melts at a lower temperature of about 1205 °C The green color of olivine intensifies with higher levels of iron content, giving it a unique appearance that makes it easy to identify
Geochemistry of pallasite olivine and the origin of pallasites Mixing olivine with bulk metal would result in much steeper Ni Co gradients than shown by the olivine data (arrows labeled m Fig 7) Pallasite olivine grains are frequently swathed by kamacite (Buseck, 1977, Lovering et al , 1957; see Fig 2 of Scott, 1977a), and kamacite is more susceptible to corrosion (Wasson and Choi, 2003) Thus
Kinetics and mechanism of mineral carbonation of olivine for CO2 . . . The carbonation capability of the pure olivine is 0 54 g CO 2 g sample based on the contents of Mg, Fe and Ca, or 0 50 g CO 2 g sample based on only the contents of Mg and Ca The mineral composition was analyzed by the Quantitative X-ray Diffraction (QXRD) method (Table 2) The major minerals are olivine and enstatite, which occupy 92 7%