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Publications (45)
Resolving the Mesozoic and Cenozoic palaeogeography and geomorphologic development of outcropping Variscan basement is a pre-condition for the understanding of central European geodynamics. For our study, we have applied apatite fission-track (AFT) and apatite (U–Th)/He (AHe) thermochronology to surface rocks of the southeastern Bohemian Massif. 46...
Homochiral proteins orchestrate biological functions throughout all domains of life, but the origin of the uniform l-stereochemistry of amino acids remains unknown. Here, we describe enantioselective adsorption experiments of racemic alanine and leucine onto homochiral d- and l-quartz as a possible mechanism for the abiotic emergence of biological...
Terrestrial life has come into being between 4 and 3.5 billion years ago. Abiogenesis is the chemical evolution from inorganic molecular species to first reproductive living organisms. Besides abiogenesis, the scientific branch of astrobiology also includes the search for extraterrestrial life on inhabitable planets and moons within and outside of...
Chromatographic interaction between infiltrating solutions of racemic mixtures of enantiomers and enantiomorphic minerals with chiral excess has been proposed as a scenario for the emergence of biomolecular homochirality. Enantiomer separation is supposed to be produced by different partition coefficients of both enantiomers with regard to crystal...
With regard to the origin of life in general and to the emergence of biomolecular homochirality in particular, any puta-tive role of naturally etched nuclear particle tracks, as for example fission tracks under early Precambrian weathering conditions, has not yet been addressed. Especially capillary tubes formed by chemical etching of fission track...
Zusammenfassung In Jahr 1895 hat Hermann TRAUBE über die Beobachtung anomaler Ätzfiguren auf Prismen-flächen von Nephelin berichtet. Diese Ätzfiguren wurden mit HCl erzeugt, hatten eine dreieckige Gestalt mit einer trichterförmigen, exzentrischen Vertiefung. Ihre Achsen waren regellos orientiert, d.h. ohne jeglichen Bezug zu kristallographisch indi...
The Southeast Anatolian Orogenic Belt (SAOB) resulted from the north-dipping subduction of the southern Neotethyan oceanic lithosphere in late Mesozoic and early Cenozoic. However, the timing and the rate of the continental collision are still under debate. Here, we present new U–Pb, Ar–Ar and Fission Track ages from the I-type calc-alkaline granit...
Explanatory text to the official map of ÖK 127 Schaldming. Scale 1:50.000
We have investigated the low-temperature history of pre-Neogene basement areas adjacent to the western extension of the North Anatolian Fault zone (NAFZ) by apatite fission track thermochronology of 33 samples taken from Marmara island, Kapidag peninsula (both in the Sea of Marmara), Samothrake island, and Chalkidike peninsula (both in the North Ae...
The book is a complete documentation of the excavations at the Judenplatz in the City of Vienna. The excavations took place between 1995 and 1998.
43 samples from Aegean islands, Thessaly, Mt. Ossa and Pelion were investigated by apatite fission-track thermochronology. The measured cooling ages of the Cyclades and Ikaria have a distinct frequency maximum between 7 and 11 Ma (Tortonian, Late Miocene) which was a time of strong crustal extension in the south Aegean back-arc position. These ages...
New field observation and petrological data certify the existence of Neogene or Pleistocene volcanism on the island of Anafi in the southern Aegean sea, and complete the knowledge of the South Aegean volcanic chain. They rule out the enigmatic position of Anafi, which was supposed to be the only non-volcanic island in the centre of the Quaternary a...
We summarize the available geological information on the Sierra Maestra Mountains in southeastern Cuba and report new zircon fission track and biotite Ar-Ar ages for this region. Two different and genetically unrelated volcanic arc sequences occur in the Sierra Maestra, one Cretaceous in age (pre-Maastrichtian) and restricted to a few outcrops on t...
We summarize the available geological information on the Sierra Maestra Mountains in southeastern Cuba and report new zircon fission track and biotite Ar-Ar ages for this region. Two different and genetically unrelated volcanic arc sequences occur in the Sierra Maestra, one Cretaceous in age (pre-Maastrichtian) and restricted to a few outcrops on t...
A wall painting from the prehistoric settlement of Akrotiri (Santorini, Greece), which is known under the name of ‘Lilies Fresco’ or ‘Spring Fresco’, displays a rocky landscape with different stages of tafoni development. This painting could be the oldest preserved picture of tafoni. Its significance is discussed relative to geomorphological concep...
Explanatory text to the official geological map of ÖK 157 Tamsweg. Scale 1:50.000.
Aboundant deposits of red chalk (hematite), ochre (goethite) and jarosite occur on several places of the island of Anafi. These pigments were produced by hydrothermal alterations in course of a young rhyolitic volcanism, and have been mined in ancient times. Anafi’s natural pigments display close similarities with some pigments of the Bronze Age wa...
Apatite fission-track thermochronology was applied to the outcropping Variscan basement of the south-eastern Bohemian massif in order to resolve its post-Variscan cooling and denudation history. Nineteen samples could be dated by the grain-population method. The ages range from 235 to 90 Ma (Middle Triassic to Middle Cretaceous). Neglecting some lo...
The Sierra Maestra in southeastern Cuba comprises Paleogene intraoceanic volcanic arc sequences which have been accreted to the North American continental margin during the late Middle Eocene, during the final stages of collision with the Caribbean plate. Geochronological analysis and geobarometric investigations on samples from Eocene granitoids c...
The Attic–Cycladic complex of Greece comprises an Eocene high-P unit with blueschist occurrences. Unroofing of this unit took place in Oligocene–Miocene times and was accompanied by a regional low-P medium-T overprint and Miocene granitic plutonism.Apatite fission-track ages of 14 “crystalline” samples from the islands of Tinos, Mikonos and Serifos...
Apatite fission-track analysis was applied to eleven samples from the southwestern Rila-Rhodope massif. Modelled cooling paths reveal regional variations in denudation history. Three palaeo-planation surfaces are observed in the Menikion mts. at different altitudes above 1000 m. They could have developed around 10 Ma ago, i.e. in pre-Messinian time...
The post-Carboniferous crustal evolution of the German Continental Deep Drilling Program (KTB) area, as summarized in this paper, could not be predicted from surface observations: deep drilling was essential for its revelation. The most conspicuous and unexpected feature discovered in the drill hole is the absence of marked gradients with respect t...
The tectonical and morphological evolution of the Eastern Alps during the Cenozoic is discussed in the light of sedimentary record and thermochronological data of crystalline basement rocks.The regional distribution of apatite fission-track data in the central Eastern Alps reveals the differential Cenozoic exhumation. In contrast to the Penninic of...
A detailed fission-track analysis was carried out on 41 apatite samples from the 4001-m-deep pilot hole of the German Continental Deep Drilling Program (KTB). The investigations include dating by the population method and length measurements of horizontal confined tracks. Age and length information indicate that all samples above the present-day pa...
Since 1985, apatite fission-track analysis was applied to more than 70 samples from surface outcrops and shallow boreholes
at the western margin of the Bohemian massif. Apatite ages were determined by the grain-population method. Additional information
from the frequency distributions of fully confined spontaneous tracks was used for modelling of...
Recently, an outcrop with clear evidence for Quaternary faulting has been discovered in the eastern part of Bohemian Massif, 25 km southwest of Brno (Moravia, Czech Republic). Basement serpentinite, fluvial gravels, loess and young scree are affected by a steep NNW-SSE trending fault. The geological situation of the outcrop is described for the fir...
The apparent shape of etched confined fission tracks in apatite depends on their crystallographic orientation, on the direction of observation and on the distribution of longitudinal etching velocities along the track. Overetched blade-like tracks, which are approximately perpendicular to the c-axis, sometimes exhibit an extremely discontinuous etc...
An overview is presented of the apatite fission-track analysis of the 4000 m deep KTB pilot hole drilled in the Variscan crystalline basement of the Oberpfalz, Germany. The apatite fission-track age profile based on 41 samples suggests a simple thermal history, i.e. a single event of uplift-induced cooling during the late Cretaceous-early Tertiary....
Projected length analysis of surface tracks enables the calculation of length dispersive spectra of apatite fission track ages determined by the grain-population technique. Different T-t paths result in characteristic apparent age-spectra which reveal the low temperature ( < 140°C) history of rocks. The concept is successfully tested against geolog...
