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Solid Earth An interactive open-access journal of the European Geosciences Union
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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 05 Nov 2019

Submitted as: research article | 05 Nov 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

Correlation of core and downhole seismic velocities in high-pressure metamorphic rocks: A case study for the COSC-1 borehole, Sweden

Felix Kästner1,2, Simona Pierdominici1, Judith Elger2, Alba Zappone3, Jochem Kück1, and Christian Berndt2 Felix Kästner et al.
  • 1Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany
  • 2GEOMAR Helmholtz Centre for Ocean Research Kiel, 24148 Kiel, Germany
  • 3ETH Zurich, Department of Earth Sciences, 8092 Zurich, Switzerland

Abstract. Deeply rooted thrust zones are key features of tectonic processes and the evolution of mountain belts. Exhumed and deeply-eroded orogens like the Scandinavian Caledonides allow to study such systems from the surface. Previous seismic investigations of the Seve Nappe Complex have shown indications for a strong but discontinuous reflectivity of this thrust zone, which is only poorly understood. The correlation of seismic properties measured on borehole cores with surface seismic data constrains the origin of this reflectivity. In this study, we compare seismic velocities measured on cores to in situ velocities measured in the borehole. The core and downhole velocities deviate by up to 2 km/s. However, velocities of mafic rocks are generally in close agreement. Seismic anisotropy increases from about 5 to 26 % at depth, indicating a transition from gneissic to schistose foliation. We suggest that differences in the core and downhole velocities are most likely the result of microcracks mainly due to depressurization. Thus, seismic velocity can help to identify mafic rocks on different scales whereas the velocity signature of other lithologies is obscured in core-derived velocities. Metamorphic foliation on the other hand has a clear expression in seismic anisotropy. These results will aid in the evaluation of core-derived seismic properties of high-grade metamorphic rocks at the COSC-1 borehole and elsewhere. In particular, they show that core log seismic integration via synthetic seismograms requires wireline logging data in any but mafic lithologies.

Felix Kästner et al.
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Felix Kästner et al.
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Publications Copernicus
Short summary
We integrate seismic velocities from laboratory, core, and borehole measurements to better understand subsurface structures associated with mountain-building processes. The investigated seismic properties, including anisotropy, allow to distinguish metamorphic lithological units along the COSC-1 borehole, Sweden. We also investigate the influence of microcracks in both data sets and their role on the physical properties.
We integrate seismic velocities from laboratory, core, and borehole measurements to better...