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Timing of plutonism in the Gällivare area: implications for Proterozoic crustal development in the northern Norrbotten ore district, Sweden

Published online by Cambridge University Press:  27 April 2017

ZMAR SARLUS ,
ULF B. ANDERSSON ,
TOBIAS E. BAUER ,
CHRISTINA WANHAINEN ,
OLOF MARTINSSON ,
ROGER NORDIN  and
JOEL B.H. ANDERSSON
ZMAR SARLUS*
Affiliation:
Division of Geosciences and Environmental Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden
ULF B. ANDERSSON
Affiliation:
Luossavaara-Kiirunavaara AB, SE-981 86 Kiruna, Sweden
TOBIAS E. BAUER
Affiliation:
Division of Geosciences and Environmental Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden
CHRISTINA WANHAINEN
Affiliation:
Division of Geosciences and Environmental Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden
OLOF MARTINSSON
Affiliation:
Division of Geosciences and Environmental Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden
ROGER NORDIN
Affiliation:
Boliden Mineral AB, SE- 936 81 Boliden, Sweden
JOEL B.H. ANDERSSON
Affiliation:
Division of Geosciences and Environmental Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden Luossavaara-Kiirunavaara AB, SE-981 86 Kiruna, Sweden
*
†Author for correspondence: [email protected]
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Abstract

Zircon ion probe (secondary-ion mass spectrometry or SIMS) data from a set of intrusive rocks emplaced in the vicinity of major ore bodies, as well as from large igneous intrusions in the Gällivare area, gave the following results: (1) the Dundret ultramafic–mafic layered complex (1883±5 Ma), the Aitik granite (1883±5 Ma), the Nautanen diorite (1870±12 Ma), the Vassaravaara ultramafic–mafic layered complex (1798±4 Ma), the Aitik dolerite (1813±9 Ma), the Bergmästergruvan and Sikträsk syenites (1795±4 Ma and 1801±3 Ma, respectively) and the Naalojärvi granite (1782±5 Ma). These data broadly fall within the ranges 1.89–1.87 Ga (early Svecofennian) and 1.80–1.78 Ga (late Svecofennian), but geochronologically allow further subdivision into pulses at 1885–1880, 1875–1870, 1800 and 1780 Ma. During these events, large layered ultramafic–mafic and felsic plutonic rocks were generated with distinct overlap in time suggesting coeval felsic–mafic magmatism. Results also indicate the presence of inherited c. 1.87 Ga zircon crystals in the plutonic rocks at 1.78 Ga, supporting reworking of the previous crust. These data indicate the importance of mantle-derived mafic underplating in the process of crustal magma generation in the region. The c. 1.88 Ga event that generated ultramafic–mafic layered complexes is tentatively suggested to have played an important role in the formation of the Aitik Cu–Au porphyry system. The later event at c. 1.80 Ga, generating voluminous mafic–felsic units, is suggested to be coupled to the regional iron-oxide-copper-gold (IOCG) overprint.

Keywords

U–Pb SIMS geochronologynorthern SwedenSvecofennianmafic–felsic plutonic rocks
Type
Original Article
Information
Geological Magazine , Volume 155 , Issue 6 , September 2018 , pp. 1351 - 1376
Copyright
Copyright © Cambridge University Press 2017 

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