Geothermal characteristics of the Ries impact structure

Popov, Yu. A.; Pohl, J.; Romushkevich, R.; Tertychnyi, Vladimir; Soffel, H.

doi:10.1046/j.1365-246x.2003.01925.x

Cited by 22 publications

(31 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A possible interpretation of this result is that the rock retains extensive microcrack damage and, further, that the degree of this damage decreases with depth. These results appear to be in qualitative agreement with the recent thermal conductivity measurements of Popov et al (2003) on archived core obtained from the Nördlingen 1973 research borehole drilled in the Ries impact structure. Thermal conductivity was found to generally increase with depth, as did the P-wave sonic log velocities.…”

Section: Open Hole Sectionsupporting

confidence: 90%

In situ seismic measurements in borehole LB‐08A in the Bosumtwi impact structure, Ghana: Preliminary interpretation

Schmitt

Milkereit

Karp

et al. 2007

Meteorit & Planetary Scien

View full text Add to dashboard Cite

Abstract-In order to assist in the interpretation of previous seismic refraction and reflection surveys, a vertical seismic profile was acquired in the Lake Bosumtwi (Ghana) hard-rock core hole LB-08A. No seismic reflections are seen in the up-going wave field obtained, and this observation is consistent with the lack of reflectivity observed in the corresponding 2-D surface seismic profile obtained in earlier studies. Direct down-going P-waves were found both in the cased sediment column from a depth of 73 m to 239 m below the lake surface and in the open-hole "hard rock" section from a depth of 239 m to 451 m of LB-08A. Analysis of the observed travel times indicates a nearly constant P-wave velocity of 1520 m/s through the soft lacustrine sediments. In the hard-rock, however, the P-wave velocity rapidly increases by nearly 30% from 2600 m/s to 3340 m/s. These values are in good agreement with the gross velocity structure obtained in the earlier joint inversion of seismic reflection and refraction data. These values are low relative to those expected for the metasedimentary protoliths, an observation that has been made at other young impact structures of similar size. The low velocities, together with the fact that they increase so rapidly, is suggestive of a decreasing density of fractures and microcracks with depth. Consequently, the seismic velocity trend may provide a proxy measure of damage, and hence, the decay of the shock pressure from the impact point. Validation of this requires additional detailed studies of the porosity structure in the core.

show abstract

Section: Open Hole Sectionsupporting

confidence: 90%

In situ seismic measurements in borehole LB‐08A in the Bosumtwi impact structure, Ghana: Preliminary interpretation

Schmitt

Milkereit

Karp

et al. 2007

Meteorit & Planetary Scien

View full text Add to dashboard Cite

show abstract

“…Investigations performed in recent years at the Vorotilovo scientific deep well drilled in the Puchezh‐Katunk impact structure, Russia [ Popov et al , 1998], and at the Nördlingen‐1973 scientific well drilled in the Ries impact structure, Germany [ Popov et al , 2003a], demonstrated (1) low thermal anisotropy of rocks (brecciated, cataclased, thermally overprinted and shock transformed target rocks) and (2) low values of thermal conductivity, density and velocity in the rocks affected by the shock and postshock thermal conditions [ Schmitt et al , 2007] in comparison with similar rocks outside these impact structures.…”

Section: Introductionmentioning

confidence: 99%

“…These peculiarities may be typical of impact structures in general and can be caused by mechanical damage and the shock‐induced thermal metamorphism of rocks [e.g., Popov et al , 1998, 2003a; Vermeesch and Morgan , 2004]. Nevertheless, this question can only be answered by taking into account the lithology of the impact structures.…”

Section: Introductionmentioning

confidence: 99%

Integrated interpretation of physical properties of rocks of the borehole Yaxcopoil‐1 (Chicxulub impact structure)

et al. 2008

Self Cite

View full text Add to dashboard Cite

[1] The borehole Yaxcopoil-1, drilled within the Chicxulub meteoritic impact structure (Mexico), was completely cored from 404 to 1511 m through postimpact Tertiary limestones underlain by impactites. The impactites comprise impact melt-rich, suevitic breccia followed by megablocks of Cretaceous limestones, calcarenites, dolomites, and anhydrites. Measurements of porosity, density, and thermal parameters on 450 samples (equidistant sampling, complete depth range) and of ultrasonic velocities and electric resistivity on 80 representative samples are used to investigate the physical properties of carbonate rocks and to study the influence of the impact. Experiments under elevated pressure, calculations using frequency-dependent Biot-Gassmann theory, and crosschecking with borehole logs, where available, show that ultrasonic laboratory and sonic in situ data correspond. Sonic and electric quasi-continuous logs are obtained from empirical correlations with thermal conductivity, density, and porosity and consideration of mineralogical composition and microstructure. These data give constraints on interpretation and geophysical modeling of, e.g., seismic and gravity data. In the Tertiary postimpact limestone section, the rock fabric (porosity) influences the physical properties. The upper boundary of the impactites is distinctly determined by the high inhomogeneity factor and anisotropy coefficient of thermal conductivity and by the temperature gradient from high-resolution borehole temperature measurements. All physical properties indicate that the upper part of the suevitic breccia can be distinguished from the lower suevite unit. In the Cretaceous megablocks, a high variability of all properties (particularly, thermal conductivity, density of solid material, and temperature gradient) due to the high variability in the mineral composition (calcite, dolomite, anhydrite) is observed.

show abstract

“…), the Ries impact structure (the Noerdlingen‐73 borehole, Germany; Popov et al. ), the Chicxulub structure (the Yaxcopoil‐1 borehole, Mexico; Popov et al. , ; Wilhelm et al.…”

Section: Introductionmentioning

confidence: 99%

“…); the rock anisotropy was taken into account at these measurements (Popov et al. , , , ; Mayr et al. , ).…”

Section: Introductionmentioning

confidence: 99%

Comparison of petrophysical properties of impactites for four meteoritic impact structures

Popov

Mayr

Romushkevich

et al. 2014

Meteorit & Planetary Scien

Self Cite

View full text Add to dashboard Cite

Abstract-We reanalyzed and compared unique data sets, which we obtained in the frame of combined petrophysical and geothermal investigations within scientific drilling projects on four impact structures: the Puchezh-Katunki impact structure (Vorotilovo borehole, Russia), the Ries impact structure (Noerdlingen-73 borehole, Germany), the Chicxulub impact structure (ICDP Yaxcopoil-1 borehole, Mexico), and the Chesapeake impact structure (ICDP-USGS-Eyreville borehole, USA). For a joined interpretation, we used the following previously published data: thermal properties, using the optical scanning technique, and porosities, both measured on densely sampled halfcores of the boreholes. For the two ICDP boreholes, we also used our previously published P-wave velocities measured on a subset of cores. We show that thermal conductivity, thermal anisotropy, porosity, and velocity can be correlated with shock metamorphism (target rocks of the Puchezh-Katunki and Ries impact structures), and confirm the absence of shock metamorphism in the samples taken from megablocks (Chicxulub and Chesapeake impact structure). The physical properties of the lithic impact breccias and suevites are influenced mainly by their impact-related porosity. Physical properties of lower porosity lithic impact breccias and suevites are also influenced by their chemical composition. These data allow for a distinction between different types of breccias due to differences concerning the texture and chemistry and the different amounts of melt and rock clasts.

show abstract

Geothermal characteristics of the Ries impact structure

Cited by 22 publications

References 11 publications

In situ seismic measurements in borehole LB‐08A in the Bosumtwi impact structure, Ghana: Preliminary interpretation

In situ seismic measurements in borehole LB‐08A in the Bosumtwi impact structure, Ghana: Preliminary interpretation

Integrated interpretation of physical properties of rocks of the borehole Yaxcopoil‐1 (Chicxulub impact structure)

Comparison of petrophysical properties of impactites for four meteoritic impact structures

Contact Info

Product

Resources

About