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Mineralogical and Geochemical Constraints on Magma Evolution and Late-Stage Crystallization History of the Breivikbotn Silicocarbonatite, Seiland Igneous Province in Northern Norway: Prerequisites for Zeolite Deposits in Carbonatite Complexes

Permanent lenke
https://hdl.handle.net/10037/15083
DOI
https://doi.org/10.3390/min8110537
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article.pdf (13.51Mb)
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Dato
2018-11-20
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Forfatter
Zozulya, Dmitry R.; Kullerud, Kåre; Ravna, Erling Krogh; Savchenko, Yevgeny E.; Selivanova, Ekaterina A.; Timofeeva, Marina G.
Sammendrag
The present work reports on new mineralogical and whole-rock geochemical data from the Breivikbotn silicocarbonatite (Seiland igneous province, North Norway), allowing conclusions to be drawn concerning its origin and the role of late fluid alteration. The rock shows a rare mineral association: calcite + pyroxene + amphibole + zeolite group minerals + garnet + titanite, with apatite, allanite, magnetite and zircon as minor and accessory minerals, and it is classified as silicocarbonatite. Calcite, titanite and pyroxene (Di36–46 Acm22–37 Hd14–21) are primarily magmatic minerals. Amphibole of mainly hastingsitic composition has formed after pyroxene at a late-magmatic stage. Zeolite group minerals (natrolite, gonnardite, Sr-rich thomsonite-(Ca)) were formed during hydrothermal alteration of primary nepheline by fluids/solutions with high Si-Al-Ca activities. Poikilitic garnet (Ti-bearing andradite) has inclusions of all primary minerals, amphibole and zeolites, and presumably crystallized metasomatically during a late metamorphic event (Caledonian orogeny). Whole-rock chemical compositions of the silicocarbonatite differs from the global average of calciocarbonatites by elevated silica, aluminium, sodium and iron, but show comparable contents of trace elements (REE, Sr, Ba). Trace element distributions and abundances indicate within-plate tectonic setting of the carbonatite. The spatial proximity of carbonatite and alkaline ultramafic rock (melteigite), the presence of “primary nepheline” in carbonatite together with the trace element distributions indicate that the carbonatite was derived by crystal fractionation of a parental carbonated foidite magma. The main prerequisites for the extensive formation of zeolite group minerals in silicocarbonatite are revealed.
Beskrivelse
Source at https://doi.org/10.3390/min8110537.
Forlag
MDPI
Sitering
Zozulya, D.R., Kullerud, K., Ravna, E.K., Savchenko, Y.E., Selivanova, E.A. & Timofeeva, M.G. (2018). Mineralogical and geochemical constraints on magma evolution and late-stage crystallization history of the breivikbotn silicocarbonatite, seiland igneous province in northern Norway: Prerequisites for zeolite deposits in carbonatite complexes. Minerals, 8(537). https://doi.org/10.3390/min8110537
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