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The Mullnäset rapakivi granite, its chemical and mineralogical composition including a comparison with the Sörvik granite, west central Sweden.

Lindh, Anders LU (2016) In GFF 138(3). p.445-453
Abstract

This contribution presents complimentary mineralogical and whole-rock chemical data for the Mullnäset rapakivi massif. Three rock types occur: gabbro, syenite with associated granite and “normal” rapakivi granite, here denoted rapakivi-textured granite. In the syenite-associated granite, extremely Mg-poor clinopyroxene and fayalite are the most important mafic minerals, whereas ferrohornblende and strongly chloritized biotite are most important in the rapakivi-textured granite. All mafic minerals are Fe-extreme. The two rapakivi granites are metaluminous straddling the boundary between calc-alkaline and alkaline granite, whereas the neighbouring, older Sörvik granite is peraluminous and typically calc-alkaline. The Mullnäset rapakivi... (More)

This contribution presents complimentary mineralogical and whole-rock chemical data for the Mullnäset rapakivi massif. Three rock types occur: gabbro, syenite with associated granite and “normal” rapakivi granite, here denoted rapakivi-textured granite. In the syenite-associated granite, extremely Mg-poor clinopyroxene and fayalite are the most important mafic minerals, whereas ferrohornblende and strongly chloritized biotite are most important in the rapakivi-textured granite. All mafic minerals are Fe-extreme. The two rapakivi granites are metaluminous straddling the boundary between calc-alkaline and alkaline granite, whereas the neighbouring, older Sörvik granite is peraluminous and typically calc-alkaline. The Mullnäset rapakivi granite is A-type. It is lower in incompatible trace elements than the Sörvik granite. The HFSE patterns differ between the two granites. In both the rapakivi and Sörvik granites, Archaean rocks form part of the source rocks. The Archaean input seems to be more important in the Mullnäset (and other rapakivi granites from the same general area) granite than in the Sörvik granite. No data contradict the suggested formation of rapakivi granite magma: upwelling mantle melts under a thickened continental crust triggering melting of the continental crust.

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organization
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Contribution to journal
publication status
published
subject
keywords
Jämtland, mineral chemistry, Mullnäset, rapakivi granite, source rock, Sörvik granite, west central Sweden, whole-rock chemistry
in
GFF
volume
138
issue
3
pages
445 - 453
publisher
Geological Society of Sweden
external identifiers
  • scopus:84962438858
ISSN
1103-5897
DOI
10.1080/11035897.2016.1164239
language
English
LU publication?
yes
id
cc7c69c8-a42b-4a41-942c-8865ace62ca3
date added to LUP
2016-06-16 09:24:30
date last changed
2017-01-16 15:50:26
@article{cc7c69c8-a42b-4a41-942c-8865ace62ca3,
  abstract     = {<p>This contribution presents complimentary mineralogical and whole-rock chemical data for the Mullnäset rapakivi massif. Three rock types occur: gabbro, syenite with associated granite and “normal” rapakivi granite, here denoted rapakivi-textured granite. In the syenite-associated granite, extremely Mg-poor clinopyroxene and fayalite are the most important mafic minerals, whereas ferrohornblende and strongly chloritized biotite are most important in the rapakivi-textured granite. All mafic minerals are Fe-extreme. The two rapakivi granites are metaluminous straddling the boundary between calc-alkaline and alkaline granite, whereas the neighbouring, older Sörvik granite is peraluminous and typically calc-alkaline. The Mullnäset rapakivi granite is A-type. It is lower in incompatible trace elements than the Sörvik granite. The HFSE patterns differ between the two granites. In both the rapakivi and Sörvik granites, Archaean rocks form part of the source rocks. The Archaean input seems to be more important in the Mullnäset (and other rapakivi granites from the same general area) granite than in the Sörvik granite. No data contradict the suggested formation of rapakivi granite magma: upwelling mantle melts under a thickened continental crust triggering melting of the continental crust.</p>},
  author       = {Lindh, Anders},
  issn         = {1103-5897},
  keyword      = {Jämtland,mineral chemistry,Mullnäset,rapakivi granite,source rock,Sörvik granite,west central Sweden,whole-rock chemistry},
  language     = {eng},
  number       = {3},
  pages        = {445--453},
  publisher    = {Geological Society of Sweden},
  series       = {GFF},
  title        = {The Mullnäset rapakivi granite, its chemical and mineralogical composition including a comparison with the Sörvik granite, west central Sweden.},
  url          = {http://dx.doi.org/10.1080/11035897.2016.1164239},
  volume       = {138},
  year         = {2016},
}