Geological Survey of Sweden

About: Geological Survey of Sweden is a government organization based out in Uppsala, Sweden. It is known for research contribution in the topics: Metamorphism & Zircon. The organization has 316 authors who have published 671 publications receiving 18333 citations. The organization is also known as: Sveriges Geologiska Undersökning.

Boat-towed radio-magnetotellurics — A new technique and case study from the city of Stockholm

Abstract: We have developed a new data acquisition system and technique to measure the radio magnetotelluric (RMT) signals from distant radio transmitters with the objective of mapping and modeling electric ...

Arsenopyrite and sphalerite as T-P indicators in sulfide ores from northern Sweden

Abstract: The compositions of arsenopyrite and sphalerite from five Swedish metamorphosed Cu, Zn-sulfide deposits are related to T and P, according to the methods described by Kretschmar and Scott (1976) and Scott (1973). The As/S ratio of arsenopyrite indicates an equilibrium temperature around 400°C for all the deposits studied, whereas the sphalerite barometer shows pressures between 5 and 7 kb. The mineral assemblages of the bedrocks indicate a similar temperature but a lower pressure. A constant fs2 is probably only effective over distances of millimetres or a few centimetres in the samples studied. The fs2 has always been lower in the surrounding rocks than in the ores as indicated by a higher As/S in arsenopyrite, more FeS in sphalerites and the absence of pyrite.

Evolving coastal character of a Baltic Sea inlet during the Holocene shoreline regression : impact on coastal zone hypoxia

Abstract: Although bottom water hypoxia (O2 < 2 mg L−1) is presently widespread in the Baltic Sea coastal zone, there is a lack of insight into past changes in bottom water oxygen in these areas on timescales of millennia, and the possible driving factors. Here, we present a sediment-based environmental reconstruction of surface water productivity, salinity and bottom water oxygen for the past 5400 years at Gasfjarden, a coastal site in SE Sweden. As proxies, we use dinoflagellate cysts, benthic foraminifera, organic carbon (Corg), biogenic silica (BSi), Corg/Ntot, Corg/Ptot, Ti/Al, K/Al and grain size distribution. The chronology of the sediment sequence is well constrained, based on 210Pb, 137Cs and AMS 14C dates. Between 3400 and 2100 BCE, isostatic conditions favored enhanced deep water exchange between Gasfjarden and the open Baltic Sea. At that time, Gasfjarden was characterized by relatively high productivity and salinity, as well as frequently occurring hypoxic-anoxic bottom water, despite the relatively large connection with the Baltic Sea. The most severe interval of oxygen depletion is recorded between 2400 and 2100 BCE, and appears to coincide with a similar hypoxic event in the Gotland Basin in the open Baltic Sea. As regional climate became wetter and colder between 2100 BCE and 700 BCE, salinity declined and bottom water oxygen conditions improved. Throughout the record, grain size, Ti/Al and K/Al data indicate an evolution towards a more enclosed coastal system, as suggested by reconstructions of the post-glacial shoreline regression. Gasfjarden shifted to close to modern conditions after 700 BCE, and was characterized by less hypoxia and lower salinity compared with 3400–700 BCE. The timing of the shift corresponds with the Sub-Boreal/Sub-Atlantic transition in Europe. Human-induced erosion in the catchment is observed as early as 600 CE, and is particularly prominent since regional copper mining activity increased around 1700 CE. A sharp increase in sediment Corg concentration is recorded since the 1950s, indicating significant anthropogenic impact on biogeochemical cycles in the coastal zone, as observed elsewhere in the Baltic Sea.

The red snow — a meteorological and pollen‐analytical study of longtransported material from snowfalls in Sweden

Abstract: Lundqvist, J., and Bengtsson, K.: The red snow — a meteorological and pollenanalytical study of longtransported material from snowfalls in Sweden. Geologiska Foreningens i Stockholm Forhandlingar, Vol. 92, pp. 288–301. Stockholm, September 30, 1970. The authors have made a pollen‐analytical study of the red substance colouring the snow that fell on two occasions in the winter 1968–1969. The pollen flora (Tab. 1) correlates well with the flora in those regions in southern Russia where at this time violent storms prevailed. The flora and the meteorological situation are discussed and it is found that the red substance most probably originated from the South Russian area. The frequency of similar meteorological situations makes it probable that such a transportation of microfossils can have some importance for pollen analysis in Scandinavia. The importance may have been still greater in late‐glacial time.

Pleistocene stratigraphy in the Dellen region, central Sweden

Abstract: The Pleistocene stratigraphy in the Dellen region, central Sweden was studied using field observations made during mapping of Quaternary deposits and fabric analyses in excavated sections. The lith ...