Granite types in Sweden

Abstract Published data on the initial Sr isotopic composition and range of SiO2 content of some representative granites from the Swedish Proterozoic is reviewed. An attempt is made to divide these granites into genetic types related to partial melting of different source materials (igneous or I-type and sedimentary or S-type) and ultimately to the tectonic environment of magma generation. It may thus be possible to distinguish between magmatism initiated entirely within the crust, and magmatism initiated within or at the top of the mantle. Four groups of I-type granitoids can be recognised in the Swedish Proterozoic and these may possibly be related to three phases of subdaction of ocean floor. The second and third subduction phases were separated by a tensional phase possibly related to continental rifting and breakup. Granites of crustal origin can be recognised but are different from S-type granites from the type-area in southeastern Australia, not being depleted in Na and Ca. They were probably gener...

[1]  R. Doig.  An alkaline rock province linking Europe and North America , 1970 .

[2]  E. Welin,et al.  New Rb—Sr Age Data for the Sub-Jotnian Volcanics (Dala Porphyries) in the Los-Hamra Region, Central Sweden , 1970 .

[3]  E. Welin,et al.  Rb‐Sr age dating of intrusive rocks of the Haparanda Suite , 1970 .

[4]  B. Gulson.  The Precambrian Geochronology of Granitic Rocks from Northern Sweden , 1972 .

[5]  J. Dewey,et al.  Plume-Generated Triple Junctions: Key Indicators in Applying Plate Tectonics to Old Rocks , 1973, The Journal of Geology.

[6]  R. Nicholson,et al.  The structural setting and geochronology of basal granitic gneisses in the Caledonides of part of Nordland, Norway , 1973, Journal of the Geological Society.

[7]  B. Chappell,et al.  Two contrasting granite types , 1974 .

[8]  R. Gorbatschev.  Fundamental subdivisions of Precambrian granitoids in the Åmål mega-unit and the evolution of the south-western Baltic Shield, Sweden , 1975 .

[9]  P. Killeen,et al.  A uranium and thorium enriched province of the Fennoscandian shield in southern Norway , 1975 .

[10]  E. Welin,et al.  The Rb—Sr age of the Ursand granite on the boundary between the Åmål and “Pregothian” mega-units of southwestern Sweden , 1975 .

[11]  F. Hubbard.  The Precambrian crystalline complex of south-western Sweden. The geology and petrogenetic development of the Varberg Region , 1975 .

[12]  Genesis of Precambrian sulfide ores, Skellefte District, Sweden , 1975 .

[13]  K. Röshoff.  Some aspects of the Precambrian in south-eastern Sweden in the light of a detailed geological study of the Lake Nömmen area , 1975 .

[14]  E. Welin,et al.  Rb-Sr age of granitoid gneisses in the “Pregothian” area of south-western Sweden , 1976 .

[15]  E. Welin,et al.  The RbSr age of the Hästefjorden granite and its bearing on the Precambrian evolution of southwestern Sweden , 1976 .

[16]  T. Skiöld.  The interpretation of the Rb-Sr and K-Ar ages of late Precambrian rocks in south-western Sweden , 1976 .

[17]  E. Welin,et al.  A Rb-Sr geochronological study of the older granitoids in the Åmål tectonic mega-unit, south-western Sweden , 1976 .

[18]  J. Chyssler,et al.  The Götemar massif in south-eastern Sweden: A reconnaissance survey , 1976 .

[19]  R. Steiger,et al.  Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology , 1977 .

[20]  E. Welin,et al.  Rb—Sr dating of rocks in the Värmland granite group in Sweden , 1977 .

[21]  A. B. Blaxland.  Agpaitic magmatism at Norra Kärr? RbSr isotopic evidence , 1977 .

[22]  T. Skiöld.  Granite ages in the Kalix area, northern Sweden , 1977 .

[23]  E. Welin,et al.  Rb—Sr dating of the Rätan granite, central Sweden , 1977 .

[24]  B. Chappell,et al.  Ultrametamorphism and granitoid genesis , 1977 .

[25]  D. Rex,et al.  New ages of carbonatitic and alkaline ultramafic rocks from Sweden and Finland , 1977 .

[26]  B. Leake,et al.  Crustal evolution in northwestern Britain and adjacent regions : proceedings of an international conference held in Glasgow University, 5-8th April 1977 to mark the opening of the new geology building in the University , 1978 .

[27]  B. Leake.  Granite emplacement: the granites of Ireland and their origin , 1978 .

[28]  D. Rickard.  The Svecokarelian anomalous ore lead line , 1978 .

[29]  E. Welin,et al.  Rb-Sr isotopic relations of a tonalitic intrusion on Tjörn Island, south-western Sweden , 1978 .

[30]  E. Welin,et al.  Rb—Sr age of the Lane granites in south-western Sweden , 1978 .

[31]  G. Åberg.  Precambrian geochronology of south-eastern Sweden , 1978 .

[32]  E. Welin,et al.  The Rb-Sr age of the Varberg charnockite, Sweden , 1978 .

[33]  T. Skiöld,et al.  Age data on Proterozoic granitoids from the Norvijaur area of northern Sweden , 1978 .

[34]  M. Wilson,et al.  The evolution of a uranium province in northern Sweden , 1979, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[35]  W. S. Pitcher.  The nature, ascent and emplacement of granitic magmas , 1979, Journal of the Geological Society.

[36]  T. Skiöld.  U-Pb zircon and Rb-Sr whole-rock and mineral ages of Proterozoic intrusives on mapsheet Lannavaara, north-eastern Sweden , 1979 .

[37]  C. Löfgren.  Do leptites represent precambrian island arc rocks , 1979 .

[38]  G. C. Brown,et al.  Uranium mineralization and granite magmatism in the British Isles , 1979, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[39]  R. Cliff,et al.  Rb-Sr ages of intrusive plutonic rocks from the Stora Le—Marstrand belt in Orust, SW Sweden , 1979 .

[40]  E. Welin,et al.  The radiometric age of a Proterozoic hyperite diabase in Värmland, western Sweden , 1980 .

[41]  M. Atherton,et al.  Origin of Granite Batholiths , 1980 .

[42]  B. Loberg.  A Proterozoic subduction zone in southern Sweden , 1980 .

[43]  B. Lundberg.  Aspects of the geology of the Skellefte field, northern Sweden , 1980 .

[44]  Fred Witschard.  Stratigraphy and geotectonic evolution of northern Norrbotten , 1980 .

[45]  B. Leake,et al.  The origin of granite magmas: a discussion , 1980, Journal of the Geological Society.

[46]  S. R. Taylor.  Origin of granite batholiths: Geochemical evidence , 1981 .