Distribution of clay minerals in surface sediments of the Eurasian Arctic Ocean

Clay-mineral distributions in the Arctic Ocean and the adjacent Eurasian shelf areas are discussed to identify source areas and transport pathways of terrigenous material in the Arctic Ocean. The main clay minerals in Eurasian Arctic Ocean sediments are illite and chlorite. Smectite and kaolinite occur in minor amounts in these sediments, but show strong variations in the shelf areas. These two minerals are therefore reliable in reconstructions of source areas of sediments from the Eurasian Arctic. The Kara Sea and the western part of the Laptev Sea are enriched in smectite, with highest values of up to 70% in the deltas of the Ob and Yenisey rivers. Illite is the dominant clay mineral in all the investigated sediments except for parts of the Kara Sea. The highest concentrations with more than 70% illite occur in the East Siberian Sea and around Svalbard. Chlorite represents the clay mineral with lowest concentration changes in the Eastern Arctic, ranging between 10 and 25%. The main source areas for kaolinite in the Eurasian Arctic are Mesozoic sedimentary rocks on Franz-Josef Land islands. Based on clay-mineral data, transport of the clay fraction via sea ice is of minor importance for the modern sedimentary budget in the Arctic basins.

Polyaromatic hydrocarbons in sediments from the Barents and White Seas

Polycyclic aromatic hydrocarbons (PAHs) are common environmental contaminants which can be derived from anthropogenic sources, such as combustion and discharges from extraction and transport, and natural processes, including leakage and erosion of fossil carbon. Natural PAH sources contribute, along with biological activities and terrestrial run-off, to the organic carbon content in sediments.The Barents Sea region is far from many anthropogenic sources of PAH, but production and trans-shipment of hydrocarbons is increasing. We present data for polycyclic aromatic hydrocarbon (PAH) concentrations in bottom sediments from 510 stations in the Barents and White Seas, and along the northern coast of Norway.

Geologische Skizze von Luzern und Umgebung,

Mode of access: Internet.

Geschichte Oesterreichs vom ausgange des Wiener october aufstandes 1848.

I. Die belagerung und eihhahme Wiens. october 1848.--II. Revolution und reation in spathare 1848.--III. Die thronbestalgung des kaisers Franz Joseph I.--IV. 1-3. t. Der ungarische winter-feldzug und die octroyirte verfazsumg. December 1848 bis marz 1849.

La mission du conventionnel Lakanal dans la Dordogne en l'an II (octobre 1793-août 1794)

"Bibliographie": p. [v]-xxii.

Centralgebiet der Schweiz enthalten auf Blatt 13,

I. Emmen- und Schlierengegenden, von F. J. Kaufmann.--II. Systematisches Verzeichniss der Kreide- und Tertiär-Versteinerungen der Umgegend von Thun, von K. Mayer-Eymar.--III. Geologische Beschreibung der Kalk- und Schiefergebirge zwischen dem Reuss- und Kienthal, von C. Moesch.--IV. Das Aarmassiv (mittlerer Theil) von A. Baltzer.