Geochemistry and varves on a sediment profile from Hämelsee, Germany

The Alleroed biozone encompasses 625 calendar years. The pollenanalytically determined upper and lower boundary is in good agreement with the development of the microfacies. The study of the macrofacies of annually laminated sediments is a useful tool. It yields not only very accurate varve counts but also paleoclimatological and environmental proxy data. The LST -event occurred 200 years before the Younger Dryas. They exIsts no relationship. However, during ten to twenty years following the LST, the lake deposited sediments similar to those at the beginning of the Younger Dryas, which should be due to comparable meteorological conditions.

Sedimentology, geochemistry and paleomagnetic of ODP Hole 151-913B

The Eocene and Oligocene epochs (55 to 23 million years ago) comprise a critical phase in Earth history. An array of geological records (Zachos et al., 2001, doi:10.1126/science.1059412; Lear et al., 2000, doi:10.1126/science.287.5451.269; Coxall et al., 2005, doi:10.1038/nature03135; Pekar et al., 2005; doi:10.1130/B25486.1; Strand et al., 2003, doi:10.1016/S0031-0182(03)00396-1) supported by climate modelling (DeConto and Pollard, 2003, doi:10.1038/nature01290) indicates a profound shift in global climate during this interval, from a state that was largely free of polar ice caps to one in which ice sheets on Antarctica approached their modern size. However, the early glaciation history of the Northern Hemisphere is a subject of controversy (Coxall et al., 2005, doi:10.1038/nature03135; Tripati et al., 2005, doi:10.1038/nature03874; Wolf-Welling et al., 1996, doi:10.2973/odp.proc.sr.151.139.1996; Moran et al., 2006, doi:10.1038/nature04800). Here we report stratigraphically extensive ice-rafted debris, including macroscopic dropstones, in late Eocene to early Oligocene sediments from the Norwegian-Greenland Sea that were deposited between about 38 and 30 million years ago. Our data indicate sediment rafting by glacial ice, rather than sea ice, and point to East Greenland as the likely source. Records of this type from one site alone cannot be used to determine the extent of ice involved. However, our data suggest the existence of (at least) isolated glaciers on Greenland about 20 million years earlier than previously documented (Winkler et al., 2002, doi:10.1007/s005310100199), at a time when temperatures and atmospheric carbon dioxide concentrations were substantially higher.

Fe-Mn crusts from the Atlantic Ocean

Mineral and chemical compositions of a set of crust samples collected from the North, Central and South Atlantic were examined by means of analytical electron microscopy and ICP-MS, chemical, and microchemical elemental analysis. Vernadite, asbolane, and goethite are dominant mineral phases of the crusts, ferrihydrite is minor, hematite and feroxyhyte are rare. The samples show wide variability in major and trace element contents; however, their characteristic geochemical signatures indicate hydrogenous origin. A comparison between compositions of oceanic hydrogenous and hydrothermal crusts and metalliferous hydrothermal sediments from different ocean areas suggests that the geochemical approach may be insufficient in some cases and fail to identify hydrothermal input in ferromanganese crusts of mixed composition.

Status assessment of toxic chemicals : arsenic /

Mode of access: Internet.

Evaluation of technology for control of arsenic emissions at the Campbell Red Lake Gold Smelter /

Mode of access: Internet.

Determination vapor pressure of slightly volatile solids. (a) Methods and apparatus. (b) The vapor pressure of arsenic trioxide.

Typewritten ms.

Thin films of gallium arsenide on low-cost substrates : final technical report for period July 5, 1976-December 5, 1978 /

"Work Performed Under Contract No. AC03-79ET20435."

Demand bibliography : gallium arsenide /

"Results from a search of the technical report database over a 10-year period ... references cover only unclassified, unlimited document references with abstracts."

Contre-poisons de l'arsenic, du sublimé corrosif, du verd-de-gris et du plomb : la première, recherches Médico-Chymiques sur différens moyens de dissoudre le mercure, &c : la seconde exposition de différens moyens d'unir le mercure au fer, &c. : la troisième, nouvelles observations sur l'éther / Pierre-Toussaint Navier ... ; Tome premier

Mode of access: Internet.

Contre-poisons de l'arsenic, du sublimé corrosif, du verd-de-gris et du plomb : la première, recherches Médico-Chymiques sur différens moyens de dissoudre le mercure, &c : la seconde exposition de différens moyens d'unir le mercure au fer, &c. : la troisième, nouvelles observations sur l'éther / Pierre-Toussaint Navier ... ; Tome second

Mode of access: Internet.

Précis des moyens de secourir les personnes empoisonnées par les poisons corrosifs : : extraits de l'ouvrage des contre-poisons de l'arsenic, du sublimé corrosif, du vert-de-gris [et] du plomb, [et]c. de M. Navier /

Mode of access: Internet.

The mineral industry of the British Empire and foreign countries. Statistics, 1919-1921. Arsenic.

At head of title: Imperial Mineral Resources Bureau.