Showing papers by "Geological Survey of Sweden published in 1977"
TL;DR: In this paper, it was found that the observed linear magnetic minima are caused by a combination of a fault graben and the oxidation of magnetite to hematite, and the alteration process (martitization) was shown on a susceptibility-Q-value diagram.
85 citations
TL;DR: In this paper, a statistical analysis of pumping-test data from wells has been used to calculate average values of transmissivity and permeability in different Swedish rocks, and the influence of the well-loss on the calculations is discussed.
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.
22 citations
TL;DR: In this article, a new heavy mineral technique suitable for regional prospecting of ores within previously glaciated areas has been developed at the Geological Survey of Sweden, based on sampling and investigation of glacial till instead of the traditional alluvial sediments.
20 citations
01 Jun 1977
TL;DR: The variability of axial orientation characteristic of B 2 folds is believed to be caused by the combined effects of two factors: the variation of the imposed strain field (relative to S 0 ), owing to the inherent characteristics of an incipient shearzone style of strain this article.
Abstract: Phosphate Hill is a small inlier of Ordovician rocks enclosed in an envelope of ?Lower Devonian quartzose sandstones and shales. Lithological layering (S 0) within the Ordovician inlier shows tight B 1 folds with a second group of folds (B 2) superimposed. The orientation and shape of these B 2 folds are highly variable. The overall structure of the area falls naturally into two subareas: Subarea 1 comprises sub‐horizontal east‐west B 1 folds which are overturned to the north and show slides on their lower limbs; B 2 folds in this subarea are small‐scale features. Subarea 2 is dominated by B 2 folds and contains a large S‐shaped B 2 fold in its eastern part. The variability of axial orientation characteristic of B 2 folds is believed to be caused by the combined effects of two factors: The variation of the imposed strain field (relative to S 0 ), owing to the inherent characteristics of an incipient shear‐zone style of strain. 2. The internal rotation of S 0 relatively to externally imposed axes ...
3 citations