TY - JOUR

T1 - Geochemistry, age, and origin of the Högberget granite, western Bergslagen, Sweden

AU - Bergman, Torbjörn

AU - Schöberg, Hans

AU - Sundblad, Krister

PY - 1995/6

Y1 - 1995/6

N2 - An undeformed Palaeoproterozoic granite pluton, located at Högberget, 10 km north of Kopparberg in western Bergslagen, has been investigated with respect to petrology, geochemistry, and geochronology. The geochemistry indicates a leucocratic and peraluminous granite and a REE pattern characterized by a large negative Eu-anomaly and a slight enrichment of the light REEs. Age determination by means of the U-Pb in zircon method yielded 1750+10 Ma. The Högberget granite is spatially and genetically related to the Wigström (Högfors) tungsten skam deposit and is comparable with other W-Mo related granites in western Bergslagen (e.g. Pingstaberg, Fjällberg, and Skålhöjden), which tradi-tionally are considered to have an anatectic origin. The data presented in this paper give further support to genetical models favouring a Late- to post-Svecofennian, granite-related origin for the W-Mo deposits in western Bergslagen and are in strong conflict with theories favouring a rift-related Early Svecofennian genesis for these ores. The recognition of c. 1.75 Ga Late Svecofennian granites in western Bergslagen indicates a large time interval between peak of regional • metamorphism and granite formation, which makes a genetic relation between regional metamorphism and the Late Svecofennian granites in western Bergslagen uncertain.

AB - An undeformed Palaeoproterozoic granite pluton, located at Högberget, 10 km north of Kopparberg in western Bergslagen, has been investigated with respect to petrology, geochemistry, and geochronology. The geochemistry indicates a leucocratic and peraluminous granite and a REE pattern characterized by a large negative Eu-anomaly and a slight enrichment of the light REEs. Age determination by means of the U-Pb in zircon method yielded 1750+10 Ma. The Högberget granite is spatially and genetically related to the Wigström (Högfors) tungsten skam deposit and is comparable with other W-Mo related granites in western Bergslagen (e.g. Pingstaberg, Fjällberg, and Skålhöjden), which tradi-tionally are considered to have an anatectic origin. The data presented in this paper give further support to genetical models favouring a Late- to post-Svecofennian, granite-related origin for the W-Mo deposits in western Bergslagen and are in strong conflict with theories favouring a rift-related Early Svecofennian genesis for these ores. The recognition of c. 1.75 Ga Late Svecofennian granites in western Bergslagen indicates a large time interval between peak of regional • metamorphism and granite formation, which makes a genetic relation between regional metamorphism and the Late Svecofennian granites in western Bergslagen uncertain.

KW - Bergslagen

KW - Granite

KW - Högberget

KW - Late Svecofennian

KW - Molybdenum

KW - Skam

KW - Sweden

KW - Tungsten

KW - U-Pb dating

KW - Wigström

KW - Zircon

UR - http://www.scopus.com/inward/record.url?scp=0029479574&partnerID=8YFLogxK

U2 - 10.1080/11035899509546205

DO - 10.1080/11035899509546205

M3 - Article

AN - SCOPUS:0029479574

VL - 117

SP - 87

EP - 95

JO - GFF

JF - GFF

SN - 1103-5897

IS - 2

ER -