Precise temperature estimation in the Tibetan crust from seismic detection of the α-β quartz transition

Mechie, J.; Sobolev, S. V.; Ratschbacher, Lothar; Babeyko, Andrey; Bock, G.; Jones, Alan G.; Nelson, K. D.; Solon, K. D.; Brown, L. D.; Zhao, Wenjin

doi:10.1130/g20367.1

Cited by 115 publications

(124 citation statements)

References 20 publications

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“…More commonly, surface heat-flow measurements are extrapolated to depth assuming a particular geothermal gradient. This approach may fail, however, at active margins or where significant fluid migration (advection) is suspected (Mechie et al 2004). As bulk electrical conductivity is strongly dependent upon temperature, magnetotellurics offers an independent means of estimating subsurface temperature.…”

Section: Studies Of Physical Thermal and Compositional Statementioning

confidence: 98%

“…In quartz-rich rock, the a/b quartz transition depends on pressure and temperature, and is largely independent of other mineral assemblages in the rock. It is furthermore accompanied by significant changes in the elastic properties of quartz, which allowed Mechie et al (2004) to identify it via wide-angle seismic reflection. As shown in Fig.…”

Section: Studies Of Physical Thermal and Compositional Statementioning

confidence: 99%

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MT+, Integrating Magnetotellurics to Determine Earth Structure, Physical State, and Processes

Bedrosian

2007

Surv Geophys

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As one of the few deep-earth imaging techniques, magnetotellurics provides information on both the structure and physical state of the crust and upper mantle. Magnetotellurics is sensitive to electrical conductivity, which varies within the earth by many orders of magnitude and is modified by a range of earth processes. As with all geophysical techniques, magnetotellurics has a non-unique inverse problem and has limitations in resolution and sensitivity. As such, an integrated approach, either via the joint interpretation of independent geophysical models, or through the simultaneous inversion of independent data sets is valuable, and at times essential to an accurate interpretation. Magnetotelluric data and models are increasingly integrated with geological, geophysical and geochemical information. This review considers recent studies that illustrate the ways in which such information is combined, from qualitative comparisons to statistical correlation studies to multi-property inversions. Also emphasized are the range of problems addressed by these integrated approaches, and their value in elucidating earth structure, physical state, and processes.

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Section: Studies Of Physical Thermal and Compositional Statementioning

confidence: 98%

Section: Studies Of Physical Thermal and Compositional Statementioning

confidence: 99%

MT+, Integrating Magnetotellurics to Determine Earth Structure, Physical State, and Processes

Bedrosian

2007

Surv Geophys

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“…1; Kern 1979Kern , 1982Carpenter, 2006). The PT trajectory of this transition is well constrained and Mechie et al (2004) have used it to determine temperature at a depth of 18km in the Tibetan crust. Marini and Manzella (2005) interpreted a reflecting layer within the lithosphere of Southern Tuscany on a similar basis.…”

Section: Introductionmentioning

confidence: 99%

Structural evolution, strain and elasticity of perovskites at high pressures and temperatures

Carpenter

Sondergeld

et al. 2006

Journal of Mineralogical and Petrological Sciences

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Octahedral tilting transitions in perovskites are usually identified by the significant lattice distortions which accompany them. The underlying mechanism of coupling between the tilts and the macroscopic strain also gives rise to large anomalies in single crystal and bulk elastic moduli. Landau theory provides an effective framework for describing these different changes in properties and relating them, quantitatively, to the evolution of the driving order parameter for the transition. This approach has been used to analyse the overall elastic behaviour of perovskites belonging to the CaTiO 3 SrTiO 3 (CST) solid solution, which is expected to be closely analogous to the behaviour of silicate perovskites at higher pressures and temperatures. Pm3 m ↔ I4/mcm and I4/mcm ↔ Pnma transitions in CST perovskites are marked by changes in the shear modulus of ~ 10 30%. The evolution of the order parameter and, hence, of the octahedral tilt angles through these can be followed through the variations of spontaneous strains extracted from high resolution lattice parameter data. Contributions to the elastic softening which are due to strain/octahedral tilt coupling have been calculated using a fully parameterised Landau model of the Pm3 m ↔ I4/mcm transition as a function of temperature, pressure and composition. Differences between calculated elastic constants and experimental data from Dynamical Mechanical Analysis, pulse echo ultrasonics and Resonant Ultrasound Spectroscopy suggest that a proportion of the total softening in tetragonal samples may be due to anelastic effects. The anelastic contributions are observed at frequencies of both a few Hz and 10's of MHz, and can be understood in terms of strain contributions arising from movements of transformation twin walls in response to an externally applied shear stress. Similar transitions in other perovskites are likely to display small anomalies in the bulk modulus, due to weak coupling between octahedral tilts and volume strain, but much larger anomalies in the shear modulus. The elastic properties of tetragonal and orthorhombic structures are likely to be quite different due to different anelastic contributions from twin wall displacements.

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“…As in the case of the b M a transition in quartz (e.g. Mechie et al, 2004;Carpenter, 2006), knowledge of the phase boundary could then help to constrain the local geotherm. A much smaller anomaly is expected in the bulk modulus (e.g.…”

Section: Introductionmentioning

confidence: 99%

Acoustic attenuation due to transformation twins in CaCl2: Analogue behaviour for stishovite

Zhang

Schranz

Carpenter

2012

Physics of the Earth and Planetary Interiors

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Precise temperature estimation in the Tibetan crust from seismic detection of the α-β quartz transition

Cited by 115 publications

References 20 publications

MT+, Integrating Magnetotellurics to Determine Earth Structure, Physical State, and Processes

MT+, Integrating Magnetotellurics to Determine Earth Structure, Physical State, and Processes

Structural evolution, strain and elasticity of perovskites at high pressures and temperatures

Acoustic attenuation due to transformation twins in CaCl2: Analogue behaviour for stishovite

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