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Mineralogical and Geochemical Response to Fluid Infiltration into Cambrian Orthopyroxene-Bearing Granitoids and Gneisses, Dronning Maud Land, Antarctica
by
Ane K. Engvik
Ane K. Engvik 1,*,
Fernando Corfu
Fernando Corfu 2
,
Ilka C. Kleinhanns
Ilka C. Kleinhanns 3
,
Heinrich Taubald
Heinrich Taubald 3 and
Synnøve Elvevold
Synnøve Elvevold 4
1
Geological Survey of Norway, N-7491 Trondheim, Norway
2
Department of Geosciences, University of Oslo, N-0316 Oslo, Norway
3
Department of Geosciences, University of Tübingen, Schnarrenbergstrasse 94-96, D-72076 Tübingen, Germany
4
Norwegian Polar Institute, N-9296 Tromsø, Norway
*
Author to whom correspondence should be addressed.
Minerals 2024, 14(8), 772; https://doi.org/10.3390/min14080772 (registering DOI)
Submission received: 24 May 2024
/
Revised: 23 July 2024
/
Accepted: 23 July 2024
/
Published: 29 July 2024
Abstract
Fluid infiltration into Proterozoic and Early Palaeozoic dry, orthopyroxene-bearing granitoids and gneisses in Dronning Maud Land, Antarctica, has caused changes to rock appearance, mineralogy, and rock chemistry. The main mineralogical changes are the replacement of orthopyroxene by hornblende and biotite, ilmenite by titanite, and various changes in feldspar structure and composition. Geochemically, these processes resulted in general gains of Si, mostly of Al, and marginally of K and Na but losses of Fe, Mg, Ti, Ca, and P. The isotopic oxygen composition (𝛿18OSMOW = 6.0‰–9.9‰) is in accordance with that of the magmatic precursor, both for the host rock and infiltrating fluid. U-Pb isotopes in zircon of the altered and unaltered syenite to quartz-monzonite indicate a primary crystallization age of 520.2 ± 1.0 Ma, while titanite defines alteration at 485.5 ± 1.4 Ma. Two sets of gneiss samples yield a Rb-Sr age of 517 ± 6 Ma and a Sm-Nd age of 536 ± 23 Ma. The initial Sr and Nd isotopic ratios suggest derivation of the gneisses from a relatively juvenile source but with a very strong metasomatic effect that introduced radiogenic Sr into the system. The granitoid data indicate instead a derivation from Mid-Proterozoic crust, probably with additions of mantle components.
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MDPI and ACS Style
Engvik, A.K.; Corfu, F.; Kleinhanns, I.C.; Taubald, H.; Elvevold, S.
Mineralogical and Geochemical Response to Fluid Infiltration into Cambrian Orthopyroxene-Bearing Granitoids and Gneisses, Dronning Maud Land, Antarctica. Minerals 2024, 14, 772.
https://doi.org/10.3390/min14080772
AMA Style
Engvik AK, Corfu F, Kleinhanns IC, Taubald H, Elvevold S.
Mineralogical and Geochemical Response to Fluid Infiltration into Cambrian Orthopyroxene-Bearing Granitoids and Gneisses, Dronning Maud Land, Antarctica. Minerals. 2024; 14(8):772.
https://doi.org/10.3390/min14080772
Chicago/Turabian Style
Engvik, Ane K., Fernando Corfu, Ilka C. Kleinhanns, Heinrich Taubald, and Synnøve Elvevold.
2024. "Mineralogical and Geochemical Response to Fluid Infiltration into Cambrian Orthopyroxene-Bearing Granitoids and Gneisses, Dronning Maud Land, Antarctica" Minerals 14, no. 8: 772.
https://doi.org/10.3390/min14080772
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