Crustal - mantle melt interactions during continental breakup at the Early Paleocene Voring Plateau, North Atlantic igneous province

status: publishe

Revised volcanostratigraphy of the Upper Miocene to Lower Pliocene Urgup Formation, Central Anatolian volcanic province, Turkey

WOS: 000286214000006Results are presented of fieldwork and laboratory analyses on the volcanostratigraphy of the Urgup Formation in the Central Anatolian volcanic province, Cappadocia, Turkey. The formation of late Miocene to early Pliocene age is exposed in areas of the Urgup Basin and Nevsehir Plateau. It consists of volcaniclastic and epiclastic members with intercalated local basaltic to andesitic lava flows and scoria. The volcaniclastic members are composed of widespread covers of voluminous rhyolitic, less often dacitic, low-aspect ignimbrites and unconsolidated Plinian air-fall pumice layers. Intercalated abundant terrestrial and/or lacustrine sedimentary successions occur, which are dominated by lahars in the south and carbonates or diatomites in the north, respectively. Based on field, mineralogical, and geochemical evidence, a number of revisions are suggested by our studies, two of which are presented and discussed here: (1) the new correlation of the former "Sofular Ignimbrite" with the ignimbritic bed of the Sarimaden Tepe Member, and (2) the identification of a widespread pair of Plinian air-fall pumice lapilli beds, tentatively called Guzel Dere Member. It can be correlated with the former stratigraphic units "Tilkoy Fall" and "Karain Fall." The Tilkoy Fall is recognized as a local remnant in an unconformity-bounded stratigraphic profile, and the Karain Fall unit is recognized as a set of reworked pumice-enriched layers in a lacustrine sediment pile. From complete terrestrial sediment sections, we identified the stratigraphic position of the Guzel Dere Member between the ignimbritic Cemilkoy and Tahar Members. The pumice layers provide a new marker horizon for external epiclastic profiles in Central Anatolia not reached by ignimbrites

Erarbeitung fachlicher Grundlagen zur untergesetzlichen Regelungen im Bodenschutz: Schwermetalltransfer Boden - Pflanze. Ergebnisse der Auswertungen hinsichtlich der Koenigswasser- und Ammoniumnitrat-Extraktion anhand der Datenbank TRANSFER

In co-operation with the ad-hoc-group 'Heavy metal transfer soil/plant' of the study group 'Soil protection' the transfer behaviour of heavy metals from soil to well-chosen food plants and forage plants was analysed under the aspects of phytotoxicity, food plant quality and forage plant quality based on the data of the data bank TRANSFER. Aim of this work was the derivation of a soil standard value concept including different threshold values by the ad-hoc-group who developed on this basis a concept for hazard assessment concerning adverse effects of soil contaminations to plants. Only extractions with aqua regia and ammoniumnitrate from outdoor investigations on cultivated sites were taken into consideration for calculating regression statistics. With the help of these statistics the relationship between heavy metals in soil and heavy metals in plants can be described, which give evidence about the probability of heavy metal concentrations in plants depending on heavy metal concentrations in soil. The following contigency tables show the distribution of heavy metal concentrations in soil and in plants for different concentration levels on the basis of maximum permissible heavy metal contents in plants and on the basis of recommendations of the ad-hoc-group concerning a soil standard value concept with different threshold values. (orig.)SIGLEAvailable from TIB Hannover: RN 8422(1999,11) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Umwelt, Naturschutz und Reaktorsicherheit, Bonn (Germany)DEGerman