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Träfflista för sökning "hsv:(NATURAL SCIENCES) hsv:(Earth and Related Environmental Sciences) hsv:(Geology) srt2:(1980-1989)"

Sökning: hsv:(NATURAL SCIENCES) hsv:(Earth and Related Environmental Sciences) hsv:(Geology) > (1980-1989)

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  • Widenfalk, Lennart, et al. (författare)
  • A multidisciplinary investigation of the Notträsk Gabbro, northern Sweden
  • 1985
  • Ingår i: Geologiska föreningens i Stockholm förhandlingar. - : Informa UK Limited. - 0016-786X. ; 107:2, s. 109-126
  • Tidskriftsartikel (refereegranskat)abstract
    • The differentiated, sulfide-bearing gabbro near the city of Boden in northern Sweden has been investigated in order to get a plausible model for its formation, shape and age. The gabbro is associated with a major fault system along which several intrusive bodies occur. The largest of these has been traversed by a gravimetric, magnetometric and geological profile. The investigated intrusion is undeformed and oval-shaped and covers some 20 km2. The outer parts of the body consist of a norite in contact with older meatasediments and granites of varying age. Inside the norite occurs a magnetite-rich gabbro, which forms a ring around the centre of the massif, which in turn consists of leucogabbro-olivine gabbro. Fe, Ti and K are low in the centre where Mg and Cr have their highest contents. Impregnations of sulfides and a massive pyrrhotite vein with some 1 % Ni are located in the norite. A number of intrusion models have been tested by computer modelling combining gravimetric and magnetic field data. The most probable model seems to be a funnel-shaped body pointing downwards. The different gabbro types dip steeply inwards indicating vertical zones rather than horizontal. Palaeomagnetic measurements show that the intrusion has a similar orientation of magnetization as other gabbros of the Haparanda series in northern Sweden (1800-1900 Ga, Rb-Sr). Furthermore, the pole distributions show that the rock cooled slowly, which may indicate that the present outcrop is a deep part of an eroded intrusion. The massif is supposed to have been formed by a diapiric re-emplacement of primary horizontal cumulates formed in the sequence olivine gabbro-leucogabbro-magnetite-bearing gabbro-norite.
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  • Aldahan, Ala (författare)
  • Mineral diagenesis and petrology of the Dala Sandstone, central Sweden
  • 1985
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The Dala Sandstone, of Proterozoic age, is the most extensive sedimentary unit in central Sweden. The rocks are quartz sandstones, lithic sandstones, feldspathic sandstones, arkoses and greywackes with intercalations of shales and siltstones less than 1 m thick. The Öje Basalt divides the sedimentary sequence into two parts. Dolerite dikes and sills of various compositions cut the sedimentary sequence, and in some parts the basalt. The clastic sediments were deposited in a dominantly continental environment. The detrital components of the sandstones are mainly quartz, feldspar and rock fragments. The most common diagenetic minerals are quartz, illite, chlorite, hematite, titanium minerals, calcite and feldspar. Diagenetic illite and chlorite were formed by alteration of detrital feldspars and biotite by authigenesis, and by aggradation crystallization of the fine-crystalline interstitial clay minerals. The sources of iron and titanium for hematite and titanium minerals, respectively, are mainly detrital biotite and ilmenite. The origin of authigenic quartz is mainly the silica produced from alteration of detrital grains, pressure solution of quartz, and replacement of detrital grains by calcite. Calcite and epidote are common as cement in sandstones close to dolerite. The diagenetic chlorite and most of the illite are Fe-rich and generally well crystallized. Their chemical composition and the crystallinity index of illite, as well as the general absence of diagenetic mixed-layer clay minerals (e.g. illite—smectite) and kaolinite, suggest their formation in the temperature range between 150 and 200°C and at maximum pressure of 1.5 kb.
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