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.

Ice recession in central Sweden, and the Swedish Time Scale

Abstract: The revision by Jarnefors (1973) of the Swedish Time Scale, bascd on vnrve chronology, is criticized as regards the connection between the Sundsvall and Bollnas-Soderhamn regions. A numbcr of facts briefly reviewed in the article indicate that the ice iecession proceeded in a more northerly direction than according to Jarnefors. The absence of connection, a different direction of ice recession, and the possible error found by Fromm (1970) could together produce an error in the time scale which in southern Sweden may exceed 1000 years.

Estimation of Transmissivity and Permeability in Swedish Bedrock

Abstract: Statistical analysis of pumping-test data from wells have been used to calculate average values of transmissivity and permeability in different Swedish rocks. The influence of the well-loss on the calculations is discussed. The highest values of transmissivity and permeability of the investigated rocks are found in the sandstones of Algonkian and Cambrian age. The Archean crystalline rocks show a wide range of results, and of the investigated rocks the gneisses seem to be more permeable than the granites. However, the degree of tectonization affects the hydraulic properties of the rocks considerably.

Glaciotectonic deformation within a flute from the Isfallsglaciären, Sweden

Abstract: The internal structure of a glacial flute in an area of fluted moraine outside the glacier Isfallsglaciaren in the Kebnekaise massif, Lapland, northern Sweden, has been observed along a series of sections. The till in the flute is underlain by glaciofluvial or glaciolacustrine sediment that has been subject to extensive glaciotectonic deformation. The flute-forming process is discussed and it is suggested that the flute was initiated beneath the warm-based part of the glacier, by the sediment moving into the low pressure area in the lee side of a clast, associated with a deforming bed. It is suggested that deformation increased both down the lee and outwards from the centre line. These results were compared with fabric data from two other flute sites from Norway where similar deformation patterns were observed. It is suggested that because the deformation pattern in the flutes formed beneath both cold toe and warm based glaciers are similar, then the warm based deforming bed model is valid for both, followed by either passive freezing by the frozen toe moving over them or active freezing by the release of pressure from the surrounding ice, causing the water-saturated till in the cavity to refreeze to the basal ice.

Using LA-ICPMS Mapping and Sector Zonation to Understand Growth and Trace-Element Partitioning in Sector-Zoned Clinopyroxene Oikocrysts from the Norra Ulvö Gabbro, Sweden

Abstract: Petrographic analysis and geochemical mapping are used to characterize sector-zoned clinopyroxene oikocrysts from the Norra Ulvo« Gabbro, Sweden. The sector zones are distinguished optically and by differences inTiO2, Al2O3, and incompatible trace elements. The oikocrysts grew with a branching morphology as evidenced by numerous triple points in a single oikocryst. Oikocrysts grew from the center of domains outward and the growth within individual domains did not completely fill the space until the oikocryst had reached its full size. In some domains sector zones are overgrown by growth zones that lack sectors. The last crystallization infilled channels that allowed late-stage liquids to move through the oikocryst at the contacts with chadacrysts. Calculation of partitioning behavior of trace elements between adjacent sectors shows it to be regular and consistent with experimental results. The data show that the CaTiAl2O6 component greatly enhances the solubility of most incompatible elements in clinopyroxene.

Glaciotectonised Quaternary sediments at Cape Shpindler, Yugorski Peninsula, Arctic Russia: implications for glacial history, ice movements and Kara Sea Ice Sheet configuration

Abstract: The coastal cliffs of Cape Shpindler, Yugorski Peninsula, Arctic Russia, occupy a key position for recording overriding ice sheets during past glaciations in the Kara Sea area, either from the Kara Sea shelf or the uplands of Yugorski Peninsula/Polar Urals. This study on Late Quaternary glacial stratigraphy and glaciotectonic structures of the Cape Shpindler coastal cliffs records two glacier advances and two ice-free periods older than the Holocene. During interglacial conditions, a sequence of marine to fluvial sediments was deposited. This was followed by a glacial event when ice moved southwards from an ice-divide over Novaya Zemlya and overrode and disturbed the interglacial sediments. After a second period of fluvial deposition, under interstadial or interglacial conditions, the area was again subject to glacial overriding, with the ice moving northwards from an inland ice divide. The age-control suggests that the older glacial event could possibly belong to marine oxygen isotope stage (MOIS) 8, Drenthe (300-250 ka), and that the underlying interglacial sediments might be Holsteinian (>300 ka). One implication of this is that relict glacier ice, buried in sediments and incorporated into the permafrost, may survive several interglacial and interstadial events. The younger glacial event recognised in the Cape Shpindler sequence is interpreted to be of Early-to-Middle Weichselian age. It is suggested to correlate to a regional glaciation around 90 or 60 ka. The Cape Shpindler record suggests more complex glacial dynamics during that glaciation than can be explained by a concentric ice sheet located in the Kara Sea, as suggested by recent geological and model studies. Copyright 2003 John Wiley & Sons, Ltd.