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Character and tecto...
Character and tectonic setting of plutonic rocks in the Gällivare area, northern Norrbotten, Sweden
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- Sarlus, Zimer, 1984- (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Martinsson, Olof (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Bauer, Tobias, Associate professor, 1982- (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Wanhainen, Christina (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Andersson, Joel (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik,Malmgeologi
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- Nordin, Roger (författare)
- Boliden Mineral AB
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(creator_code:org_t)
- 2018-11-15
- 2019
- Engelska.
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Ingår i: GFF. - : Taylor & Francis. - 1103-5897 .- 2000-0863. ; 141:1, s. 1-20
- Relaterad länk:
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https://www.tandfonl...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Petrographical and lithogeochemical investigations in combination with mapping in the Gällivare area, northern Norrbotten, Sweden, have led to the identification of several igneous intrusive rock types. These include: (1) ultramafic-mafic complexes, (2) mafic-intermediate rocks, (3) dolerites and (4) felsic plutons. The ultramafic-mafic rocks include the ca. 1.88 Ga Dundret complex and ca. 1.80 Ga Vassaravaara complex. The Dundret complex has tholeiitic to calc-alkaline affinity, shows a primitive mineral content and was formed in an extensional tectonic setting. The Vassaravaara complex has a similar chemical signature as the Dundret complex. The mafic-intermediate plutons vary in composition from gabbro to diorite. The chemical signature of the dioritic rocks indicate formation in a volcanic arc setting. Dolerites occur as solitary dikes and have calc-alkaline affinity. The felsic plutons include granite and syenite of ca. 1.88, 1.80 and 1.78 Ga age. The felsic plutons have calc-alkaline to shoshonitic affinity and mostly show a metaluminous I-type character. Results indicate subduction at 1.90 Ga resulting in a volcanic arc system, and including extensional events generating back-arc environments leading to mafic, intermediate and felsic magmatism in the Gällivare area. Subduction at 1.80 Ga is suggested to have caused a similar process generating mafic and felsic magmatic rocks in the same area. A subsequent collision event finally generated 1.78 Ga granitic rocks.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- Gällivare area
- mafic layered intrusions
- petrography
- lithogeochemistry
- back-arc environment
- Malmgeologi
- Ore Geology
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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