Geodynamic implications of flattened tabular equigranular textured peridotites from the Bakony-Balaton Highland Volcanic Field (Western Hungary)

Hidas, Károly; Falus, György; Szabó, Csaba; Szabó, Péter Jánoš; Kovàcs, István; Földes, Tamás

doi:10.1016/j.jog.2006.10.007

Cited by 39 publications

(37 citation statements)

References 57 publications

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“…From the observed CPO patterns, we infer activation of the (010)[100] and (010)[001] slip systems. Glide on the (010)[001] slip system has been documented in naturally deformed orthopyroxene (Hidas et al, 2007;Jung et al, 2010), but alignment of [100] axes with the lineation is not commonly observed. Low-angle misorientation axes in orthopyroxene crystals are abundant and exhibit predominance of [010] rotation axes.…”

Section: Orthopyroxenementioning

confidence: 99%

Constraints on the rheology of the lower crust in a strike-slip plate boundary: evidence from the San Quintín xenoliths, Baja California, Mexico

et al. 2017

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Abstract. The rheology of lower crust and its transient behavior in active strike-slip plate boundaries remain poorly understood. To address this issue, we analyzed a suite of granulite and lherzolite xenoliths from the upper Pleistocene–Holocene San Quintín volcanic field of northern Baja California, Mexico. The San Quintín volcanic field is located 20 km east of the Baja California shear zone, which accommodates the relative movement between the Pacific plate and Baja California microplate. The development of a strong foliation in both the mafic granulites and lherzolites, suggests that a lithospheric-scale shear zone exists beneath the San Quintín volcanic field. Combining microstructural observations, geothermometry, and phase equilibria modeling, we estimated that crystal-plastic deformation took place at temperatures of 750–890 °C and pressures of 400–560 MPa, corresponding to 15–22 km depth. A hot crustal geotherm of 40 ° C km−1 is required to explain the estimated deformation conditions. Infrared spectroscopy shows that plagioclase in the mafic granulites is relatively dry. Microstructures are interpreted to show that deformation in both the uppermost lower crust and upper mantle was accommodated by a combination of dislocation creep and grain-size-sensitive creep. Recrystallized grain size paleopiezometry yields low differential stresses of 12–33 and 17 MPa for plagioclase and olivine, respectively. The lower range of stresses (12–17 MPa) in the mafic granulite and lherzolite xenoliths is interpreted to be associated with transient deformation under decreasing stress conditions, following an event of stress increase. Using flow laws for dry plagioclase, we estimated a low viscosity of 1.1–1.3×1020 Pa ⋅ s for the high temperature conditions (890 °C) in the lower crust. Significantly lower viscosities in the range of 1016–1019 Pa ⋅ s, were estimated using flow laws for wet plagioclase. The shallow upper mantle has a low viscosity of 5.7×1019 Pa ⋅ s, which indicates the lack of an upper-mantle lid beneath northern Baja California. Our data show that during post-seismic transients, the upper mantle and the lower crust in the Pacific–Baja California plate boundary are characterized by similar and low differential stress. Transient viscosity of the lower crust is similar to the viscosity of the upper mantle.

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Section: Orthopyroxenementioning

confidence: 99%

Constraints on the rheology of the lower crust in a strike-slip plate boundary: evidence from the San Quintín xenoliths, Baja California, Mexico

et al. 2017

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“…This type of orthopyroxene CPO was classified and defined as Type-AC CPO (Fig. 9) (Jung et al, 2010), which has been the most commonly observed CPO in natural rocks (Ishii and Sawaguchi, 2002;Skemer et al, 2006;Xu et al, 2006;Hidas et al, 2007;Tommasi et al, 2008;Soustelle et al, 2009;Jung et al, 2010;Puelles et al, 2012). There are three other types of orthopyroxene CPOs found in the study of mantle xenoliths in the Spitsbergen, Svalbard in the Arctic (Jung et al, 2010).…”

Section: Cpos Of Orthopyroxenementioning

confidence: 99%

Erratum to: Crystal preferred orientations of olivine, orthopyroxene, serpentine, chlorite, and amphibole, and implications for seismic anisotropy in subduction zones: a review

Jung

2018

Geosci J

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There are errors in the article entitled "Crystal preferred orientations of olivine, orthopyroxene, serpentine, chlorite, and amphibole, and implications for seismic anisotropy in subduction zones: a review" by Haemyeong Jung, which appeared on pages 985-1011 of the December issue in 2017. The author has provided a corrected article which is attached at the end of this erratum. ABSTRACT:This study provides a comprehensive review of the crystal preferred orientation (CPO) of olivine and orthopyroxene in the upper mantle, and of several hydrous minerals in the mantle wedge and at the slab-mantle interface. It discusses the seismic anisotropy of those minerals. Water-induced CPOs of olivine produced by previous experimental studies under high pressure and temperature conditions were found in many natural rocks. It is emphasized that the strong CPOs of hydrous minerals such as serpentine, chlorite, and amphibole, play an important role in interpreting the anomalously strong seismic anisotropy observed in subduction zones.

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“…Orthopyroxene is the second most abundant mineral in the upper mantle and, together with olivine, is believed to be one of the major components of mantle Katayama et al, 2005;Vauchez et al, 2005;Mizukami et al, 2004;Sawaguchi, 2004;Ben-Ismail and Mainprice, 1998;Nicolas and Christensen, 1987), whereas previous studies on the LPO of orthopyroxene and its seismic anisotropy have been limited (Soustelle et al, 2009;Hidas et al, 2007;Skemer et al, 2006;Vauchez et al, 2005;Christensen and Lundquist, 1982).…”

Section: Introductionmentioning

confidence: 99%

“…According to Christensen and Lundqist (1982), the LPO of orthopyroxene (Opx) in naturally deformed rocks is exclusively controlled by only one slip system, namely, (100) [001]. Recent studies on the LPO of Opx in ultramafic rocks also suggest the same dominant slip system of (100) [001] for the deformation of Opx (Skemer et al, 2010(Skemer et al, , 2006Soustelle et al, 2009;Tommasi et al, 2008;Hidas et al, 2007;Xu et al, 2006;Vauchez et al, 2005;Ishii and Sawaguchi, 2002;Vauchez and Garrido, 2001). However, most of previous studies on the LPO of Opx used a small number of data, and it is not clear yet if there are other LPO of Opx present and other slip systems operating for the deformation of Opx in nature.…”

Section: Introductionmentioning

confidence: 99%

Lattice preferred orientation, water content, and seismic anisotropy of orthopyroxene

et al. 2010

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Lattice preferred orientation (LPO) and seismic anisotropy of orthopyroxene (enstatite) in mantle xenoliths from Spitsbergen, Svalbard, near the Arctic, are studied. LPOs of enstatite were determined using electron backscattered diffraction (EBSD). We found four types of LPOs of orthopyroxene and defined them as type-AC, -AB, -BC, and -ABC. Type-AC LPO of orthopyroxene is defined as (100) plane aligned subparallel to foliation and [001] axis aligned subparallel to lineation. Type-AB LPO is defined as (100) plane aligned subparallel to foliation and [010] axis aligned subparallel to linea- tion. Type-BC LPO is defined as (010) plane aligned subparallel to foliation and [001] axis aligned subparallel to lineation. Type-ABC LPO is defined as both (100) and (010) planes aligned subparallel to foliation with a girdle distribution of both [100] and [010] axes normal to lineation and [001] axis alignedsubparallel to lineation. We report for the first time the type-AB, -BC, and -ABC LPO of orthopyroxene. We found that the LPO pattern has a correlation with the content of orthopyroxene in the specimen. Nicolet 6700 FTIR (Fourier transformation infrared) study of enstatite showed that type-AC LPO was observed mostly in the samples of enstatite with low water content. It is found that the strength of the LPO of enstatite decreases with increasing water content and has a correlation with the strength of the LPO of olivine: the stronger the LPO of enstatite, the stronger the LPO of olivine. Seismic anisotropy of enstatite was smaller than that of olivine in the same specimen.

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Geodynamic implications of flattened tabular equigranular textured peridotites from the Bakony-Balaton Highland Volcanic Field (Western Hungary)

Cited by 39 publications

References 57 publications

Constraints on the rheology of the lower crust in a strike-slip plate boundary: evidence from the San Quintín xenoliths, Baja California, Mexico

Constraints on the rheology of the lower crust in a strike-slip plate boundary: evidence from the San Quintín xenoliths, Baja California, Mexico

Erratum to: Crystal preferred orientations of olivine, orthopyroxene, serpentine, chlorite, and amphibole, and implications for seismic anisotropy in subduction zones: a review

Lattice preferred orientation, water content, and seismic anisotropy of orthopyroxene

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