Seismic properties of eclogites: implications on crustal composition and exhumation mechanism of the Sulu ultrahigh-pressure metamorphic belt

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2005 Vol. 21, No. 2

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Seismic properties of eclogites: implications on crustal composition and exhumation mechanism of the Sulu ultrahigh-pressure metamorphic belt[J]. Acta Petrologica Sinica, 2005, 21(2): 451-464.

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Seismic properties of eclogites: implications on crustal composition and exhumation mechanism of the Sulu ultrahigh-pressure metamorphic belt[J]. Acta Petrologica Sinica, 2005, 21(2): 451-464.

Seismic properties of eclogites: implications on crustal composition and exhumation mechanism of the Sulu ultrahigh-pressure metamorphic belt

Fund Project:
加拿大自然和工程研究基金科技部973项目(2003CB716502)南京大学人才培养基金资助项目的联合资助

Revised Date: 20 January 2005

Publish Date: 31 March 2005

Abstract

Abstract

Laboratory-derived P- and S-wave velocities for three types of eclogites are summarized. Combined with seismic properties of other lithologies, the results are helpful to interpret seismic data from the Dabie-Sulu orogenic belt. The interfaces between eclogites (high velocity and density) and almost all other lithologies such as felsic gneisses, marble, quartzite, amphibolite, mafic granulite, and serpentinized peridotite show large values of reflection coefficient ( >0. 1) and are thus able to produce strong seismic reflections. If crustal materials subducted and preserved in the lithospheric upper mantle as eclogites interlayered with felsic gneiss, garnet-jadeite quartzite, marble and serpentinized peridotite, they could be a good candidate for regional seismic reflections beneath orogenic belts, Based on a refraction profile in the Chinese Continental Scientific Drilling area, the crustal composition beneath the Sulu UHP belt is estimated to test different exhumation models of UHP rocks. Although eclogites are widely exposed in the surface and drill holes, they may not exit in the todays deep crust of the Sulu terrane, implying that these UHP rocks are tectonic slices that exhumed along a series of shear zones and finally thrust over an UHP-free middle-lower crust.
- Eclogite /
- Seismic velocity /
- Seismic anisotropy /
- Ultrahigh-pressure metamorphism /
- Sulu orogenic belt

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References

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