Serpentine Mineral Replacements of Natural Olivine and their Seismic Implications: Oceanic Lizardite versus Subduction-Related Antigorite

Boudier, Françoise; Baronnet, Alain; Mainprice, David

doi:10.1093/petrology/egp049

Cited by 150 publications

(134 citation statements)

References 27 publications

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“…6c, d, and e). Around porphyroclastic olivine, the secondary topotactic relationship of Boudier et al (2010) is observed in our study (Figs. 7a and 8d, e).…”

Section: Antigorite Cpo In Initial Stage Of Serpentinizationsupporting

confidence: 77%

“…Bezacier et al, 2010;Boudier et al, 2010;Christensen, 2004;Jung, 2011;Katayama et al, 2009;Mookherjee and Capitani, 2011;Watanabe et al, 2011). Compared with Bezacier et al Table 3 Maximum and minimum P-wave velocities (in km/s), P-wave anisotropy (AVp) (%), maximum shear-wave splitting (dVs max) (in km/s) and maximum S-wave anisotropy (AVs max) (%) for different samples.…”

Section: Anisotropy Of Elastic Propertiesmentioning

confidence: 98%

“…Boudier et al (2010) describe the topotactic relationships between antigorite and olivine, based on TEM analyses. In this case, source peridotite shows A-type fabric (Morales et al, 2013 thin section of our study, the topotactic relationships reported by Boudier et al (2010) cannot explain the relationship between the bulk CPOs of olivine (Fig. 6a, b) and antigorite CPO (Fig.…”

Section: Antigorite Cpo In Initial Stage Of Serpentinizationmentioning

confidence: 99%

“…Boudier et al (2010) proposed a topotactic formation of antigorite CPO from olivine, based on transmission electron microscopy (TEM) studies of the relationship of the crystallographic orientations of host olivine and newly formed antigorite grains in samples from the Colorado Plateau xenoliths. They concluded that the source peridotite CPO defines the antigorite serpentinite CPO.…”

Section: Introductionmentioning

confidence: 99%

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Antigorite crystallographic preferred orientations in serpentinites from Japan

Soda

Wenk

2014

Tectonophysics

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Foliated antigorite serpentinites are contributing to seismic anisotropy in subduction zones. However, uncertainty remains regarding the development of antigorite crystal preferred orientations (CPO). This study analyzes the CPOs of antigorite and olivine in variably serpentinized samples of antigorite serpentinite from three localities in Southwest Japan, using U-stage, EBSD, and synchrotron X-rays. In all samples (010) poles show a maximum parallel to the lineation, and (001) poles concentrate normal to the foliation with a partial girdle about the lineation. (100) poles are less distinct and scatter widely. The three measurement methods give similar results, though orientation distributions from X-ray analysis which averages over larger sample volumes are more regular and weaker than U-stage and EBSD which focuses on local well-crystallized grains. In olivine-bearing serpentinite, the olivine CPO does not appear to control the antigorite CPO, though there are some topotactic relationships. The antigorite CPO formed contemporaneously with serpentinization and shear deformation. Based on our analyses, in a subduction zone mantle wedge, the (010) pole of antigorite is parallel to the direction of the subduction, and (001) lattice planes are parallel to the interface of the subducting oceanic plate. By averaging single crystal elastic properties over orientation distributions wave velocities have been calculated. Fast P velocities are parallel to the subduction direction and slow velocities are perpendicular to the subducting plate with an anisotropy of 10-15%.

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“…6c, d, and e). Around porphyroclastic olivine, the secondary topotactic relationship of Boudier et al (2010) is observed in our study (Figs. 7a and 8d, e).…”

Section: Antigorite Cpo In Initial Stage Of Serpentinizationsupporting

confidence: 77%

Section: Anisotropy Of Elastic Propertiesmentioning

confidence: 98%

Section: Antigorite Cpo In Initial Stage Of Serpentinizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Antigorite crystallographic preferred orientations in serpentinites from Japan

Soda

Wenk

2014

Tectonophysics

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“…However, a recent study indicates that hydrated products of peridotite, serpentine, with high anisotropy (about 40 % for v P and 50 % for v S ) (Bezacier et al 2010), may have more important influence on shear wave splitting of subduction zones. Different seismic splitting behavior can simply be inferred from two topotactic relationships between serpentine and olivine (Boudier et al 2010). Alternative to the complex mixing minerals model of subduction zones, we propose a ''pure'' crystal model for explaining the fast wave polarization (see Sect.…”

Section: Introductionmentioning

confidence: 99%

Lattice-Preferred orientations of olivine in subducting oceanic lithosphere derived from the observed seismic anisotropies in double seismic zones

Han

Zhang

et al. 2016

Earthq Sci

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Subduction zones can generally be classified into Mariana type and Chilean type depending on plate ages, plate thicknesses, subduction angles, back-arc deformation patterns, etc. The double seismic zones (DSZs) in subduction zones are mainly divided into type I and type II which, respectively, correspond to the Mariana type and Chilean type in most cases. Seismic anisotropy is an important parameter characterizing the geophysical features of the lithosphere, including the subduction zones, and can be described by the two parameters of delay time dt and fast wave polarization direction /. We totally collected 524 seismic anisotropy data records from 24 DSZs and analyzed the statistical correlations between seismic anisotropy and the related physical parameters of DSZs. Our statistical analysis demonstrated that the fast wave polarization directions are parallel to the trench strike with no more than 30°for most type I DSZs, while being nearly perpendicular to the trench strike for type II DSZs. We also calculated roughly linear correlations that the delay time dt increases with dip angles but decreases with subduction rates. A linear equation was summarized to describe the strong correlation between DSZ's subduction angle a DSZ and seismic anisotropy in subduction zones. These results suggest that the anisotropic structure of the subducting lithosphere can be described as a possible equivalent crystal similar to the olivine crystal with three mutually orthogonal polarization axes, of which the longest and the second axes are nearly along the trench-perpendicular and trench-parallel directions, respectively.

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Serpentinization of mantle‐derived peridotites at mid‐ocean ridges: Mesh texture development in the context of tectonic exhumation

Rouméjon

Cannat

2014

Geochem Geophys Geosyst

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At slow spreading ridges, axial detachment faults exhume mantle-derived peridotites and hydrothermal alteration causes serpentinization in a domain extending more than 1 km next to the fault. At the microscopic scale, serpentinization progresses from a microfracture network toward the center of olivine relicts and forms a mesh texture. We present a petrographic study (SEM, EBSD, and Raman) of the serpentine mesh texture in a set of 278 abyssal serpentinized peridotites from the Mid-Atlantic and Southwest Indian Ridges. We show that serpentinization initiated along two intersecting sets of microfractures that have consistent orientations at the sample scale, and in at least one studied location, at the 100 m scale. We propose that these microfractures formed in fresh peridotites due to combined thermal and tectonic stresses and subsequently served as channels for serpentinizing fluids. Additional reaction-induced cracks developed for serpentinization extents <20%. The resulting microfracture network has a typical spacing of $60 mm but most serpentinization occurs next to a subset of these microfractures that define mesh cells 100-400 mm in size. Apparent mesh rim thickness is on average 33 6 19 mm corresponding to serpentinization extents of 70-80%. Published laboratory experiments suggest that mesh rims formation could be completed in a few years (i.e., quasi instantaneous at the plate tectonic timescale). The depth and extent of the serpentinization domain in the detachment fault's footwall are probably variable in time and space and as a result we expect that the serpentine mesh texture at slow spreading ridges forms at variable rates with a spatially heterogeneous distribution.

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Serpentine Mineral Replacements of Natural Olivine and their Seismic Implications: Oceanic Lizardite versus Subduction-Related Antigorite

Cited by 150 publications

References 27 publications

Antigorite crystallographic preferred orientations in serpentinites from Japan

Antigorite crystallographic preferred orientations in serpentinites from Japan

Lattice-Preferred orientations of olivine in subducting oceanic lithosphere derived from the observed seismic anisotropies in double seismic zones

Serpentinization of mantle‐derived peridotites at mid‐ocean ridges: Mesh texture development in the context of tectonic exhumation

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