安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- 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
- 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 Ni isotopes of Ni-Cu deposits in northwest China: A potential . . .
Olivine grains from mineralized gabbronorite have higher δ 60 58 Ni values (+0 68 ‰, Phase III) than those from sulfide-barren olivine gabbro (δ 60 58 Ni = +0 23 ‰, Phase I) Systematic stratigraphic Ni isotope variations in the Huangshanxi olivine from intervals with varying degrees of sulfide segregation and magma replenishment further
- 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
- Dissolution of olivine during natural weathering - ScienceDirect
Olivine exposed and weathered at and near outcrop surfaces In both images, the limit of finite Z-contrast is the outcrop surface; the black areas at the top and or left of the fields of view are mounting medium filling space outside the sample (a) Olivine exposed and weathered at the surface of a young basaltic lava flow on island of Hawai’i
- 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 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
- Trace elements in olivine: Proxies for petrogenesis, mineralization and . . .
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
|
|
|