Attenuation of compressional waves in peridotite measured as a function of temperature at 200 MPa

Sato, Hiroki; Sacks, I. Selwyn; Murase, Tsutomu; Muncill, Gregory; Fukuyama, Hiroyuki

doi:10.1007/bf01772608

Cited by 21 publications

(3 citation statements)

References 46 publications

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“…12 has also been observed by Jones et al (1980) and Sato et al (1988). We suggest that the decrease in the Q factor at temperatures above 125 • C is likely due to bubble formation.…”

Section: Discussion and Analysissupporting

confidence: 73%

Temperature dependence of seismic properties in geothermal rocks at reservoir conditions

et al. 2010

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“…12 has also been observed by Jones et al (1980) and Sato et al (1988). We suggest that the decrease in the Q factor at temperatures above 125 • C is likely due to bubble formation.…”

Section: Discussion and Analysissupporting

confidence: 73%

Temperature dependence of seismic properties in geothermal rocks at reservoir conditions

et al. 2010

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“… Darbyshire et al [2000a] and Staples et al [1997] both put an upper bound of 1% on melt fraction below the Moho based on velocity and density anomalies, respectively. In addition, laboratory experiments demonstrate that the effect of partial melt on anharmonic velocity does not become significant until the fraction of melt exceeds 2% [ Sato et al , 1988]. When attenuation effects are taken into account, the effect of low degrees of melt on velocity is more significant.…”

Section: Discussionmentioning

confidence: 99%

Imaging the mantle beneath Iceland using integrated seismological techniques

et al. 2002

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[1] Using a combination of body wave and surface wave data sets to reveal the mantle plume and plume head, this study presents a tomographic image of the mantle structure beneath Iceland to 400 km depth. Data comes primarily from the PASSCAL-HOTSPOT deployment of 30 broadband instruments over a period of 2 years, and is supplemented by data from the SIL and ICEMELT networks. Three sets of relative teleseismic body wave arrival times are generated through cross correlation: S and SKS arrivals at 0.03-0.1 Hz, and P and PKIKP arrivals at 0.03-0.1 and 0.8-2.0 Hz. Prior to inversion the crustal portion of the travel time anomalies is removed using the crustal model ICECRTb. This step has a significant effect on the mantle velocity variations imaged down to a depth of $250 km. Inversion of relative arrival times only provides information on lateral velocity variations. Surface waves are therefore used to provide absolute velocity information for the uppermost mantle beneath Iceland. The average wave number for the Love wave fundamental mode at 0.020 and 0.024 Hz is measured and used to invert for the average S velocity. Combination of the body wave and surface wave information reveals a predominantly horizontal low-velocity anomaly extending from the Moho down to $250 km depth, interpreted as a plume head. Below the plume head a near-cylindrical lowvelocity anomaly with a radius of $100 km and peak V P and V S anomalies of À2% and À4%, respectively, extends down to the maximum depth of resolution at 400 km. Within the plume head, in the uppermost mantle above the core of the plume, there is a relatively high velocity with a maximum V P and V S anomaly of +2%. This high-velocity anomaly may be the result of the extreme degree of melt extraction necessary to generate the thick (46 km) crust in central Iceland. Comparison of the plume volumetric flux implied by our images, the crustal generation rate, and the degree of melting suggested by rare earth element inversions, suggests that (1) mantle material must be flowing horizontally away from the plume core faster than the overlying lithosphere and (2)

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“…In tectonically active area with the thickening of crust and rather large geothermal gradient such as Tibetan Plateau and Andean orogenic zone, it is irreversible that some minerals undergo transitions which will consequently influence the physical properties of rocks [12][13][14][15][16] . Substantial decrease of Q p and Vp of peridotite has been observed at temperatures below and above the onset of partial melting [17] . The influences of partial melting on the Vp of granites were experimentally studied by Muellor et al [18] and Aizawa et al [19] .…”

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confidence: 98%

Vp of muscovite-biotite gneiss up to 950°C at 400 MPa: Constraints on the origin of abnormal seismic layers in continental crust

2007

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Here we present experimental results of compressional wave velocity (Vp) of muscovite-biotite gneiss from Higher Himalayan Crystallines (HHC) at the temperature up to 950℃ and the pressure of 0.1-400 MPa. At 400 MPa, when the temperature is lower than 600℃, Vp decreases linearly with increasing temperature at the rate of (∂Vp/∂T) p = −4.43×10 −4 km/s ℃. In the temperature range of 600-800℃, Vp drops significantly and the signal is degraded gradually due to the dehydration of muscovite and α-quartz softening. When the temperature rises from 800℃ to 875℃, Vp increases and the signals become clear again as a result of the temperature going through the β-quartz range. The experiments indicate that the duration has great influence on the experimental results when temperature is above the dehydration point of biotite. During the first 30 h at 950℃, the Vp decreases substantially from 5.9 to 5.4 km/s and the signal amplitude is attenuated by more than 80%. After the 30-h transition, the Vp and the amplitude of ultrasonic wave signals become steady. The decrease of Vp and attenuation of the signals at 950℃ are associated with the breakdown reactions of biotite. The experiments suggest that the breakdown of muscovite and/or quartz softening can contribute to the low seismic wave velocity in thickened quartz-rich felsic-crust such as what is beneath southern Tibet. Additionally, α-β quartz transition generates a measurable high seismic velocity zone, which provides a possibility of precisely constraining the temperature in the upper-middle continental crust. Our study also demonstrates that duration is a key factor to obtain credible experimental results. α-β quartz transition, dehydration of mica, experiments at high temperature and high pressure, intracrustal high or low wave velocity layers, temperature gradient Seismic exploration is one of the most important means to reveal the structures and compositions of deep crust, and to infer the crustal evolution. However, in order to interpret the seismic data, scientists need relations between seismic wave velocities, endogenic properties of rocks (such as mineral compositions, lattice-preferred orientation of minerals, pore and pore fluid), and exogenic environments (such as temperature and pressure) [1][2][3][4][5] . These relations are the foundation of constraining the interpretation [6][7][8][9][10][11] . In tectonically active area with the thickening of crust and rather large geothermal gradient such as Tibetan Plateau and Andean orogenic zone, it is irreversible that some minerals undergo transitions which will consequently influence the physical properties of rocks [12][13][14][15][16] . Substantial decrease

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Attenuation of compressional waves in peridotite measured as a function of temperature at 200 MPa

Cited by 21 publications

References 46 publications

Temperature dependence of seismic properties in geothermal rocks at reservoir conditions

Temperature dependence of seismic properties in geothermal rocks at reservoir conditions

Imaging the mantle beneath Iceland using integrated seismological techniques

Vp of muscovite-biotite gneiss up to 950°C at 400 MPa: Constraints on the origin of abnormal seismic layers in continental crust

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