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Crustal reactivatio...
Crustal reactivation in northern Sweden : the Vettasjärvi granite
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- Öhlander, Björn (author)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Hamilton, P. Joseph (author)
- Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow
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- Fallick, Anthony F. (author)
- Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow
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- Wilson, Michael R. (author)
- Sveriges Geologiska AB, Luleå
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(creator_code:org_t)
- Elsevier BV, 1987
- 1987
- English.
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In: Precambrian Research. - : Elsevier BV. - 0301-9268 .- 1872-7433. ; 35:C, s. 277-293
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The 1.8 Ga old Vettasjärvi granite belongs to a widespread granite type in northern Sweden and northern Finland. It is a leucocratic, generally massive, pink granite covering a large area but possesses a small vertical extent. Foliated varieties occur and gneissic ghost structures are common. Gradual transitions from biotite-rich gneiss to granite have also been observed. Mineralogy and major and trace element geochemistry demonstrate the minimum-melt character of the Vettasjärvi granite. The low contents of elements such as Nb, Y, Sn and F indicate that it is also undifferentiated. Initial εNd values between −6.2 and −8.2 suggest that the Vettasjärvi granite was generated by crustal anatexis with a major Archaean component as source material. REE contents support this conclusion. Molar proportion ratios Al2O3/Na2O+K2O+CaO lower than 1.1, combined with δ18O values between 8 and 5 suggest that little or no pelitic sedimentary material was involved in the genesis. The Vettasjärvi granite is not a single intrusion, but more likely a zone of remobilisation where granite was generated and gently and irregularly emplaced.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Keyword
- Applied Geology
- Tillämpad geologi
Publication and Content Type
- ref (subject category)
- art (subject category)
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