Informations- und Datenmanagement am Beispiel einer Langzeitstudie zum Ökologischen Landbau (“Hof Ritzerau”, Norddeutschland)

Scientists from various disciplines and different research institutes form the interdisciplinary project “Hof Ritzerau” (Ritzerau, Northern Germany) focussing on the effects of organic farming on animals, plants, crop production, crop diseases, soils and economics. Due to the longterm runtime and to the multidisciplinarity a consequent and consistent management of data and information is developed on the basis of Open Source software. Two core elements of this web-based scientific information system are presented here - a metadata server (GeoNetwork) and a map server (UMN Map-server). Conclusions: The importance of professional management of data, information and knowledge can hardly be underestimated. For developing the infrastructure and specific profiles, knowledge from other disciplines (e.g. business sciences, library sciences, environmental informatics) was used

Relative contributions of crust and mantle to the origin of the Bijli Rhyolite in a palaeoproterozoic bimodal volcanic sequence (Dongargarh group), central India

New mineralogical, bulk chemical and oxygen isotope data on the Palaeoproterozoic Bijli Rhyolite, the basal unit of a bimodal volcanic sequence (Dongargarh Group) in central India, and one of the most voluminous silicic volcanic expressions in the Indian Shield, are presented. The Bijli Rhyolite can be recognized as a poorly sorted pyroclastic deposit, and comprises of phenocrystic K-feldspar + albite ± anorthoclase set in fine-grained micro-fragmental matrix of quartz-feldspar-sericite-chlorite-iron-oxide ± calcite. The rocks are largely metaluminous with high SiO2, Na2O + K2O, Fe/Mg, Ga/Al, Zr, Ta, Sn, Y, REE and low CaO, Ba, Sr contents; the composition points to an 'A-type granite' melt. The rocks show negative Cs-, Sr-, Eu- and Ti- anomalies with incompatible element concentrations 2-3 times more than the upper continental crust (UCC). LREE is high (La/Yb ~20) and HREE 20-30 times chondritic. δ18Owhole-rock varies between 4.4 and 7.8‰ (mean 5.87±1.26‰). The Bijli melt is neither formed by fractionation of a basaltic magma, nor does it represent a fractionated crustal melt. It is shown that the mantle-derived high temperature basaltic komatiitic melts/high Mg basalts triggered crustal melting, and interacted predominantly with deep crust compositionally similar to the Average Archaean Granulite (AAG), and a shallower crustal component with low CaO and Al2O3 to give rise to the hybrid Bijli melts. Geochemical mass balance suggests that ~30% partial melting of AAG under anhydrous condition, instead of the upper continental crust (UCC) including the Amgaon granitoid gneiss reported from the area, better matches the trace element concentrations in the rocks. The similar Ta/Th of the rhyolites (0.060) and average granulite (0.065) vs. UCC (0.13) also support a deep crustal protolith. Variable contributions of crust and mantle, and action of hydrothermal fluid are attributed for the spread in δ18Owhole-rock values. The fast eruption of high temperature ~900°C) rhyolitic melts suggests a rapid drop in pressure of melting related to decompression in an extensional setting

Kultur der Urzeit. Teil 1: Steinzeit : (die vormetallischen Zeiten, ältere und jüngere Steinzeit Europas, gleichartige Kulturen in anderen Erdteilen)

Enthält Bd.1: Steinzeit : (die vormetallischen Zeiten, ältere und jüngere Steinzeit Europas, gleichartige Kulturen in anderen Erdteilen

Kulturelle Transformationsprozesse in der Geldgeschichte des vorislamischen Asien. Iran – Baktrien – Indien

The following paper examines processes of exchange and transfer of cultural patterns, forms of representation and religious concepts via commerce and monetary systems. It focuses on the monetary history of ancient Iran, Bactria as well as Northwestern India. Furthermore it addresses also the phenomena of continuity and discontinuity which occur in the course of change in sovereignty, namely in the Seleucid, Arsacid and Sasanid era of Iran, under the reign of Greco-Bactrian and Indo-Greek kings in Bactria and in the Indian Kushan Empire

Characterization of fluids involved in the Gneiss-Charnockite transformation in Southern Kerala (India)

The characterization of fluids involved in the gneiss-charnockite transformation in southern Kerala are discussed. Using a variety of techniques, including microthermometry, Raman laser probe analysis, and mass spectrometry, it was concluded that the CO2-rich, N2-bearing metamorphic fluids in these rocks were internally-derived rather than having been introduced by CO2-streaming

Kabbaldurga-type charnockitization: A local phenomenon in the granulite to amphibolite grade transition zone

In the deeply eroded Precambrian crust of South India and Sri Lanka, a series of spectacular exposures shows progressive development of coarse-grained charnockite through dehydration of amphibolite grade gneisses in different arrested stages. At Kabbaldurga, charnockitization of Archaean grey biotite-hornblende gneisses occurred about 2.5 Ga ago and evidently was induced by the influx of external carbonic fluids along a system of ductile shears and the foliation planes. The results of oxygen isotope thermometry and of geothermobarometry in adjacent areas indicate a P-T regime of 700 to 750 C and 5 to 7 kb. The decrease of water activity in the fluid infiltrated zones caused an almost complete breakdown of hornblende and biotite and the new growth of hypersthene. Detailed petrographic and geochemical studies revealed marked changes in mineralogy and chemistry from granodioritic to granitic which document the metasomatic nature of the process