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.

Determination of zinc in pig blood.

Abstract: A rapid spectrochemical method for determining zinc in 1 ml. portions of pig blood is described. Blood ash is dissolved in HNO3 and excited in a high voltage spark, using graphite capillary electrodes. Spectra are recorded on Kodak SWR or B-10 plates and the analysis (internal standard line pair Zn 2138/Cd 2288) is densitometered. Some results for young pigs fed on both wet and dry diet show a period of low blood zinc about 13 weeks after birth, coinciding with maximum susceptibility to swine parakeratosis.

The Use of Geophysics for Sensitive Clay Investigations

Abstract: Marine clay deposits in coastal, post-submarine areas of Scandinavia and North America may be subjected to quick clay landslides and hence significant efforts are being taken to map their occurrence and extent. Recently, considerable efforts by a number of researchers have been made to investigate areas of sensitive clay using a range of geophysical techniques. Although the majority of this work has focussed on measurements of electrical resistivity, other electromagnetic and seismic geophysical techniques have also received attention in the literature. The purpose of this paper is to review recent research concerning the effectiveness of a number of geophysical techniques for investigating sensitive clays. In addition to discussing a number of case studies, this review will also consider recent work showing the correlation of geophysical measurements, and in particular electrical resistivity, with a range of relevant engineering properties.

Design Considerations Regarding Echelle Spectographs for Image Dissector Tubes

Abstract: In this paper the optimization of echelle spectrographs for use with image dissector tubes is discussed. With all degrees of freedom in the choice of design parameters a rule for the optimization is given. It is also shown that there is a need for high-resolution image dissector tubes with larger photocathodes than those of the tubes available at present

Anisotropic velocity models for (3-D) seismic imaging of the Lower Seve Nappe in Jämtland, Sweden

Abstract: Strong anisotropy of seismic velocity in the Earth's crust poses serious challenges for seismic imaging. Where in situ seismic properties are not available, the anisotropy can be determined from velocity analysis of surface and borehole seismic profiles. This is well established for dense, long-offset reflection seismic data. However, it is unknown how applicable this approach is for sparse seismic reflection data with low fold and short offsets in anisotropic metamorphic rocks. Here, we show that anisotropy parameters can be determined from a sparse 3-D data set at the COSC-1 borehole site in the Swedish Caledonides and that the results agree well with the seismic anisotropy parameters determined from seismic laboratory measurements on core samples. Applying these anisotropy parameters during 3-D seismic imaging improves the seismic image of the high-amplitude reflections especially in the vicinity of the lower part of the borehole. Strong reflections in the resulting seismic data show good correlation with the borehole-derived lithology. Our results aid the interpretation and extrapolation of the seismic stratigraphy of the Lower Seve Nappe in Jämtland and other parts in the Caledonides.

Mn3+-bearing pargasite from the Långban Fe-Mn oxide mineralisation, Bergslagen, Sweden

Abstract: Supplying new data on the nature of amphibole-group minerals, a recent find in the Palaeoproterozoic carbonate-hosted Langban Fe-Mn oxide deposit comprises a manganian plumbian pargasite. Here we report textural and mineralogical data on this clinoamphibole, based on optical microscopy, powder X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analyses, electron microprobe techniques and optical absorption spectroscopy. The mineral occurs as relatively dark cherry-red, mostly subhedral, often strongly poikiloblastic crystals dispersed in a hausmannite-braunite-bearing, silicate-impregnated calcitic carbonate rock. Electron microprobe analysis of the amphibole gives the composition (Na,K)0.96(Ca,Pb)1.97(Mg4.24Mn0.40Al0.25Fe0.08Ti0.01) (Si6.40Al1.59)O22(OH)2. Refinement of powder XRD data resulted in a unit cell with a = 9.897 (6), b = 17.97 (2), c = 5.260 (7) A, and β = 105.22 (8)°. Combining compositional data with the results from optical absorption spectroscopy, it is evident t...