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Antigorite is a phyllosilicate of the serpentine group and the high-temperature and pressure polymorph of lizardite and chrysotile. It is a primary constituent of serpentinites and most commonly occurs in subduction complexes with ultramafic rocks that experienced high-pressure metamorphism.
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Name: Antigorite RRUFF ID: R070228 Ideal Chemistry: Mg 3 Si 2 O 5 (OH) 4 Locality: Wood's Chrome Mine (Wood's Mine), Texas, Lancaster County, Pennsylvania, USA Source: Michael Scott S100701 Owner: RRUFF Description: Compact massive, light to dark green associated with chromite Status: The identification of this mineral has been …
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4.6 Bulk rock fluid release from the antigorite + brucite reaction The maximum and minimum weight percentage of fluid released from the antigorite + brucite reaction in the Zermatt-Saas serpentinites was forward modelled using Perple_X's subroutine Meemum in the FMASH and CFMASH system for dunites, harzburgites and …
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The rock selected is the same material as the "isotropic" block of "Vermont antigorite serpentinite" described in detail by David et al. . The rock is fine grained, nearly pure antigorite (95 %) with minor amount of magnetite and …
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Serpentine is a family of polymorphs that include the flaky to platy antigorite, massive lizardite and fibrous clinochrysotile, orthochrysotile and parachrysotile. The polymorphs are often intimately intergrown in a particular rocks, hence the localities for all the serpentine family minerals are combined below. Serpentine minerals form as the result of low grade …
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The parental antigorite grains in the olivine-rich layers are euhedral long rods scattered in the matrix of olivine and diopside grains (Figures 5a and S2a) (see also Liu et al., 2018 for more details). The prograde minerals after antigorite dehydration are olivine and talc.
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Antigorite, chrysotile, and lizardite comprise the serpentine group. Antigorite and lizardite are typically massive and fine grained; ... To a petrologist, the term clay refers to a kind of rock or sediment, usually made of any of a number of minerals referred to as clay minerals.
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Antigorite is a type of serpentine mineral with a distinct structure characterized by a large cell parameter and a corrugated sheet structure. It typically forms through the retrograde hydrothermal alteration of ultrabasic igneous rocks and is known for its low refractive indices and birefringes. ... The host rock of this deposit is mostly ...
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The results are combined with measurements of LPO induced by deformation in a high-pressure antigorite-bearing ultrabasic rock in order to calculate the seismic anisotropy of serpentinites and interpret seismological data in subduction zones. ... and a photon counting silicon avalanche photodiode were used in all experiments. …
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A comprehensive description of the geological framework, and sampling details of the MG 159 antigorite specimen are available in Mellini et al. . According to Capitani & Mellini, the chemical ... ranging from a dry dunite ( olivine), to a fully serpentinized rock ( antigorite), hence following a simplified approach that does …
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We report on the presence of the serpentine-type antigorite in abyssal-serpentinized peridotite. At mid-ocean spreading ridges, antigorite crystallizes under retrograde metamorphic conditions during tectonic exhumation of the newly formed oceanic lithosphere. Using optical microscopy and micro-Raman spectroscopy, we identified …
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Antigorite dehydration has been studied in situ using time-resolved X-ray diffraction (XRD) in the 1.1–5.5 GPa pressure range. The sequence of XRD spectra reveals that the high-temperature stability limit of antigorite is decreased by 50–100 °C under H 2 O-unsaturated conditions. The decomposition of antigorite into the high-temperature …
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Diamond rock saws; Hydraulic rock crusher; ICP-MS; Ion Chromatograph System; Laser Ablation ... Ca–Mg–Al pyroxene, and holds the albite component in this feldspar-free, high-pressure, low-temperature metamorphic rock. Omphacite is usually pale green, and can be very slightly pleochroic. ... Antigorite is a serpentine mineral that is platy ...
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Dissolution rate of antigorite from a whole-rock experimental study of serpentinite dissolution from 2 ... The serpentinite used in this study was initially ground using a jaw crusher and then using an agate mortar and pestle, and subsequently dry sieved. ... 2014 for further details). Calculated and measured concentrations of Si, ...
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Antigorite serpentinite is expected to occur in parts of subduction plate boundaries, and may suppress earthquake slip, but the dominant deformation mechanisms and resultant rheology of antigorite are unclear. ... This mechanism allows movement at a rate that depends on the amount of slip (strain) the rock has accommodated, and the …
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