Olivine - an overview | ScienceDirect Topics
2012年3月7日 · 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 - an overview - ScienceDirect Topics
Olivine is the main constituent of peridotite xenoliths and is a major host for magnesium, iron, and nickel. The Mg# of olivine reflects that of the whole rock which in turn is related to the degree of melt depletion or enrichment in iron.
Minor and trace elements in olivines as probes into early igneous …
2013年2月1日 · 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.
Trace elements in olivine: Proxies for petrogenesis, mineralization …
2021年5月1日 · The studied samples are composed of olivine, olivine + orthopyroxene, and olivine + chromite, termed dunite, harzburgite and chromitite, respectively (Bai et al., 2019, 2021). They are representative of the entire vertical stratigraphic section of the Peridotite Series and, thus, represent the early formation stage of a large layered intrusion.
A first-principles molecular dynamics study of molecular hydrogen ...
2024年9月7日 · Diffusion of hydrogen in minerals is the key process for the transportation of water in the mantle. The prominence of olivine as the dominant mineral in the Earth's upper mantle has led to extensive investigation of its H + diffusivities (Kohlstedt and Mackwell, 1998, Demouchy and Mackwell, 2006, Demouchy, 2010, Du Frane and Tyburczy, 2012, Novella et al., 2017, Sun et …
Feasibility of increasing marine carbon storage through olivine ...
2023年12月1日 · 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 ...
Enhanced olivine dissolution in seawater through continuous grain ...
2023年10月15日 · The olivine dissolution rate R i is in itself dependent on the olivine dissolution rate constant k i (μ m o l o l i v i n e m-2 s-1), the reactive surface area A (m 2 g-1), the pore water saturation state Ω with respect to olivine, and the olivine loading C, which represents the amount of olivine per unit of area (g per m 2 of application ...
Time scales of olivine storage and transport as revealed by …
2024年7月1日 · This olivine-rich alkali basalt contains olivine autocrysts, the most abundant mineral, reaching a size of up to 3 mm (87% of the total crystal volume). Additionally, microautocrysts of clinopyroxene (10%) and Fe Ti oxides (3%) are present within a porphyritic groundmass composed of plagioclase, clinopyroxene, olivine, Fe Ti oxides, and glass.
Kinetics and mechanism of mineral carbonation of olivine for CO2 ...
2019年1月15日 · 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%.
Olivine dissolution rates: A critical review - ScienceDirect
2018年11月15日 · 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 ...