Noble gases and mineralogy of meteorites from China and the Grove Mountains,Antarctica: A 0.05 Ma cosmic ray exposure age of GRV 98004

Abstract— We determined the mineralogical and chemical characteristics and the He, Ne, and Ar isotopic abundances of 2 meteorites that fell in China and of 2 meteorites that were recovered by the 15th Chinese Antarctic Research Expedition. Guangmingshan (H5), Zhuanghe (H5), and Grove Mountain (GRV) 98002 (L5) yield cosmic ray exposure (CRE) ages of 68.7 ± 10.0 Ma, 3.8 ± 0.6 Ma, and 17.0 ± 2.5 Ma, respectively. These ages are within the range typically observed for the respective meteorite types. GRV 98004 (H5) had an extremely short parent body‐Earth transfer time of 0.052 ± 0.008 Ma. Its petrography and mineral chemistry are indistinguishable from other typical H5 chondrites. Only 3 other meteorites exist with similarly low CRE ages: Farmington (L5), Galim (LL6), and ALH 82100 (CM2). We show that several asteroids in Earth‐crossing orbits, or in the main asteroid belt with orbits close to an ejection resonance, are spectrally matching candidates and may represent immediate precursor bodies of meteorites with CRE ages ≤0.1 Ma.     

Variations in the fatty acid profile of marine animals caused by environmental and developmental changes

A method for the assessment of the fatty acid profile in single eggs or larvae of marine fish has been developed. The method, which only requires 50 μg or less of tissue, is based on methanolysis, high-resolution gas chromatography and multivariate data-analysis. In four examples employing cod eggs and larvae, shrimp and periwinkles it is demonstrated that the fatty acid profile changes with changes in the environment, like temperature change, and also with man-induced changes, like oil-pollution. The fatty acid profile of cod eggs is shown to change during the development from newly spawned to just before hatching.     

Uranus: Disk structure within the 7300-Å methane band

Orthogonal narrow-band (100 Å) photoelectric slit scan photometry of Uranus has been used to infer the basic two-dimensional structure of the disk within the 7300-Å methane band. Numerical image reconstruction and restoration techniques have been applied to quantitatively estimate the degrees of polar and limb brightening on the planet. Through partial removal of atmospheric smearing, an effective spatial resolution of approximately 0.9 arcsec has been achieved. Peak polar, limb, and central intensities on the disk are in the respective proportions 3:2:1. In addition, the bright polar feature is displaced from the geometric pole towards the equator of the planet.     

Do the Austrian blackfly fauna (Diptera: Simuliidae) support the typological approach of the EU water framework directive?

The Austrian blackfly fauna were analysed with regard to spatial (ecoregions, bioregions), vertical (altitude classes) and longitudinal zonation characteristics [stream order, biocoenotic (= fish) regions] on the basis of 2600 investigation sites. Of a total of 45 species recorded, Simulium ornatum, S. variegatum, S. argyreatum and S. reptans are the most common and most frequently distributed species, occurring in 60% of the investigated sites. Although the Austrian blackfly fauna seem to be quite well documented (on average one investigation site per 32 km²) the jackknife analyses indicates that there are still some fauna deficits. Whereas the species diversity of the main ecoregions is quite similar, the number of species differs clearly between the bioregions. Within the typological context of the Water Framework Directive, the Austrian Simuliidae confirm the bioregions as the most useful spatial units for river typology. A further optimisation in predicting a target list of blackfly species of a site can be achieved by subdividing the bioregions into either catchment area and altitude classes or into longitudinal zonation types (biocoenotic regions).     

Gibt es auch im Diluvium orogene Phasen?

Ohne Zusammenfassung     

Kleine Geschichten um Leopold v.Buch

Ohne Zusammenfassung     

Das Verhalten der Dünen beim Ostwärtswandern der ostfriesischen Inseln

Ohne Zusammenfassung     

Arealtypenkunde und Atlantisfrage

Zusammenfassung Eine sowohl systematisch, wie ökologisch und genetisch gerichtete Arealtypenforschung wird als ein für paläogeographische Fragestellung besonders geeigneter Forschungszweig der Biogeographie in seiner Arbeitsweise und seinen Ergebnissen kurz geschildert.Die wichtigsten Tatsachen und Probleme solcher Forschung werden angedeutet. Einige neue Forschungsergebnisse werden mitgeteilt.Der Standort der Theorie der Epeirophoresen wird wie folgt angegeben: Vorerst ist die Theorie rein biogeographisch noch nicht endgültig erwiesen. Sie ist in der Hauptsache auf rein biogeographischem Wege auch nicht erweisbar. Von den heute vorhandenen geotektonischen Theorien ist sie aber in vielen Einzelfällen durchaus als die einfachere und wahrscheinlichere anzusehen. Der Gedanke der Epeirophoresen an sich ist auf viele biogeographische Probleme von fruchtbarster Wirkung gewesen. Die Theorie der Epeirophoresen ist somit zumindest eine brauchbare Arbeitstheorie, wenn sich auch aus der kritischen Zusammenarbeit der einzelnen Geowissenschaften keine eindeutige Entscheidung herbeiführen lassen sollte.