A Geological and geophysical synthesis of the Svartliden Project, Sweden and its application in defining gold exploration targets.
Laurent, Y (2001) A Geological and geophysical synthesis of the Svartliden Project, Sweden and its application in defining gold exploration targets. Research Master thesis, University of Tasmania.
The Svartliden Project is located in north central Sweden, 7Skm west-northwest of the
town of the Lycksele. The geology comprises of a Palaeoproterozoic package of
intercalated turbiditic sedimentary rocks and extrusive coherent and non-coherent basaltic
Gold mineralisation is associated with diopside +green amphibole +silica +arsenopyrite.
Alteration is best developed along the intersection lineation between bedding and the
primary cleavage. Mineralisation is concentrated in areas of low shear strain formed by
the pressure shadow effect from the regional rotating syn-orogenic granitoids.
Pyrrhotite is the most pervasive sulphide and is found as a primary mineral in
carbonaceous sediments and as a late-stage sulphide in the "Mineralised Zone".
Pyrrhotite is responsible for the conductivity, chargeability and, along with magnetite, the
magnetic susceptibility found in the Svartliden shear zone.
Ground magnetic and electromagnetic surveys were carried out over the project area. The
ground magnetics does not differentiate the magnetite-bearing volcanics from the
pyrrhotite-bearing carbonaceous sediments and the "Mineralised Zone". The ground
electromagnetic survey defines high conductive zones, generated by the pyrrhotitebearing
sediments and the "Mineralised Zone", within resistive granitoids and volcanics.
Downhole apparent resistivity, IP and magnetic susceptibility were conducted on three
drillholes along 1700mB. The magnetic susceptibility, as with the ground magnetics, is
unable to differentiate magnetite-bearing volcanic rocks from the pyrrhotite-bearing
units. Apparent resistivity has an inverse correlation with chargeability.
Log transformation of the ground in-phase EM data delineates first- and second-order
conductive anomalies. First-order anomalies represent the pyrrhotite-bearing
carbonaceous sedimentary unit. Second-order anomalies represent the pyrrhotite-bearing
"Mineralised Zone". Second-order anomalies, calculated from in-phase EM data, can be
used to target areas for gold exploration at both a project and regional scale.
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