Effect of water activity on rates of serpentinization of olivine - Nature
2017年7月14日 · Here we use a novel in situ experimental method involving olivine micro-reactors and show that the rate of serpentinization is strongly controlled by the salinity (water activity) of the...
Serpentinization - Wikipedia
Serpentinization is a hydration and metamorphic transformation of ferromagnesian minerals, such as olivine and pyroxene, in mafic and ultramafic rock to produce serpentinite. [1] Minerals formed by serpentinization include the serpentine group minerals (antigorite, lizardite, chrysotile), brucite, talc, Ni-Fe alloys, and magnetite.
Hydrogen generation from serpentinization of iron-rich olivine …
2022年1月15日 · The results show that serpentinization of Fe-rich olivine is capable of generating substantially greater amounts of H 2 per mole than is observed for serpentinization of Mg-rich olivine, by a factor of two to ten depending on temperature and olivine composition.
Here we use a novel in situ experimental method involving olivine micro-reactors and show that the rate of serpentinization is strongly controlled by the salinity (water activity) of the...
Dynamics of coupled olivine dissolution and serpentine …
2022年6月30日 · This study involved hydrothermal flow-through serpentinization experiments using olivine powder and 0.5 m NaCl solution at 260 °C–300 °C and 50 MPa to investigate the reactive transport process of serpentinization, which is fundamental to natural hydrothermal systems (Tutolo et al., 2018).
Serpentinization of olivine in troctolites and olivine gabbros …
2017年6月1日 · The three types of vein serpentine commonly fill microcracks in olivine and show an incipient stage of mesh-rim formation, whereas the mesh-center type occurs as pseudomorphs after olivine grains subjected to complete serpentinization.
Onset and Progression of Serpentinization and Magnetite …
2009年2月19日 · Two episodes of serpentinization are recognized. The first, dominant in weakly serpentinized samples, is an approximately isochemical (except for water) replacement of olivine (Fo 84–85) by a mixture of serpentine (antigorite, Mg …
Serpentinization of oceanic peridotites: 2. Kinetics and …
2012年4月4日 · Eighty percent of serpentinization was achieved after 60 d for olivine grain sizes of 5–15 μ m and after 500 d for grain sizes of 50–63 μ m. Serpentinization kinetics were found to be inversely proportional to the geometrical surface area of the starting olivine grains.
Abiotic methane synthesis and serpentinization in olivine-hosted ... - PNAS
2019年8月19日 · Detailed examination of 160 samples from ultraslow- to fast-spreading midocean ridges, subduction zones, and ophiolites revealed that hydrogen (H 2) and CH 4 formation linked to serpentinization within olivine-hosted secondary fluid inclusions
RESEARCH FOCUS: Serpentinization and the formation of
2016年2月1日 · Serpentinized ultramafic rocks constitute a major part of the oceanic lithosphere. They form when water interacts with olivine and pyroxene—the primary minerals of Earth’s mantle—to form serpentine, magnetite, and brucite.