Alteration paragenesis and mineral chemistry of the Tjårrojåkka apatite–iron and Cu (-Au) occurrences, Kiruna area, northern Sweden

Edfelt, Åsa; Armstrong, Robin; Smith, Martin; Martinsson, Olof

doi:10.1007/s00126-005-0005-y

Cited by 44 publications

(42 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In all these fluids K shows a strong positive correlation with Ba and Ba-rich K-feldspar has been reported from the IOCG deposit at Tjarrojakka (Edfelt et al, 2005).…”

Section: Controls On Major Element Chemistrysupporting

confidence: 63%

Hydrothermal fluid evolution and metal transport in the Kiruna District, Sweden: Contrasting metal behaviour in aqueous and aqueous–carbonic brines

Smith

Gleeson

Yardley

2013

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Please cite this article as: Smith, M.P., Gleeson, S.A., Yardley, B.W.D., Hydrothermal fluid evolution and metal transport in the Kiruna District, Sweden: Contrasting metal behaviour in aqueous and aqueous-carbonic brines, Geochimica et Cosmochimica Acta (2012), doi: http://dx.doi.org/10. 1016/j.gca.2012.10.015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Hydrothermal fluid evolution and metal transport in the Kiruna District, Sweden: Contrasting metal behaviour in aqueous and aqueous-carbonic brines. Iron and other transition metal contents correlate strongly with Cl concentrations, with secondary controls on solubility from pH, redox and temperature. Copper and Ag contents are higher in lower salinity aqueous-carbonic brines (up to 5000ppm Cu, 900ppm Ag) than in the most saline brines (up to 2297ppm Cu, 837ppm Ag). This may reflect differences in metal source between deposit types, but is also consistent with the complexation of Cu by bisulphide in the lower salinity fluids. Late stage aqueous-carbonic fluid flux through the deformed deposits either introduced additional copper to the deposits, remobilised pre-existing copper or both.

show abstract

“…In all these fluids K shows a strong positive correlation with Ba and Ba-rich K-feldspar has been reported from the IOCG deposit at Tjarrojakka (Edfelt et al, 2005).…”

Section: Controls On Major Element Chemistrysupporting

confidence: 63%

Hydrothermal fluid evolution and metal transport in the Kiruna District, Sweden: Contrasting metal behaviour in aqueous and aqueous–carbonic brines

Smith

Gleeson

Yardley

2013

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

show abstract

“…The northern region of the Fennoscandian Shield is recognised as an economically important metallogenic province dominated by generally small Fe oxide and Au -Cu deposits, some with IOCG affinities (Niiranen et al 2002;Edfelt et al 2005;Niiranen 2005;Weihed et al 2005). These deposits mainly occur within or close to (5100 km) the margin of the Archean craton (Figure 1), above Archean continental crust and subcontinental lithospheric mantle, and are hosted by juvenile Paleoproterozoic volcano-sedimentary sequences formed during rifting of the Archean craton (Weihed et al 2005).…”

Section: Study Areamentioning

confidence: 99%

“…Kiruna) and epigenetic CuAu to intrusion-related Cu -Au deposits with very few Fe oxides (e.g. Aitik) as discussed by Nyströ m & Henriquez (1994), Edfelt et al (2005), Wanhainen et al (2005) & Niiranen et al (2007. These deposits occur in Archean to Proterozoic crust along the rifted southwest margin of the Archean Karelian craton where they are temporally associated with calc-alkalic to alkalic magmatism.…”

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Reconnaissance-scale conceptual fuzzy-logic prospectivity modelling for iron oxide copper – gold deposits in the northern Fennoscandian Shield, Finland

Nykänen

Groves

Ojala

et al. 2008

Australian Journal of Earth Sciences

125

View full text Add to dashboard Cite

The conceptual approach used in this study incorporates spatial analysis techniques for data integration and analysis to perform reconnaissance-scale mineral prospectivity mapping for iron oxide copper -gold (IOCG) mineralisation in Finland. The known IOCG occurrences in Finland are characterised by the following features: (i) an epigenetic magnetite-rich host-rock; (ii) an association of Fe -Cu -Au + Co + U; (iii) ore minerals comprising magnetite, chalcopyrite, pyrite or pyrrhotite, and native gold; (iv) a gangue dominated by Ca-amphibole + diopside, albite and biotite; (v) enrichment in Ag, Au, Bi, Ca, CO 2 , Cu, Fe, S, Te + As, Ba, Cl, Co, K, LREE, Mo, Na, Pb, Rb, Sb, Se, U; (vi) multi-stage alteration; (vii) formation in the P -T range of 400 -6008C, 150 -350 MPa; and (viii) a distinct structural control in regions that have experienced both extensive compression and extension. The datasets used for the prospectivity analysis include a 1:1 000 000 scale geological map, high-resolution airborne geophysics, regional-scale multi-element till-geochemistry data, and a mineral occurrence database. The derived parameters used in the conceptual analysis include: (i) proximity to the craton margin; (ii) intersecting fault structures; (iii) presence of granitic intrusions particularly those with compatible and incompatible element enrichment; (iv) Cu, Co and Fe concentrations in till samples; (v) presence of hematite; and (vi) airborne magnetic highs and radiometric U data. A conceptual fuzzy-logic model was used to predict and locate the most prospective or favourable areas for IOCG exploration in the study area using the above-mentioned data layers. The models identify several permissive and highpotential areas within a significantly reduced potential exploration area. Validation of the modelling was conducted by quantifying the spatial association between the predicted endowment as favourability classes on the prospectivity map and the known mineral deposit sites with IOCG affinities using the Bayesian weights-of-evidence method.

show abstract

“…1). The association of Fe-and Cuoccurrences makes the area of Tjårrojåkka one of the Fe-oxide Cu-Au (IOCG; Hitzman et al, 1992;Hitzman, 2000) prospects in the Kiruna district (Edfelt et al, 2005(Edfelt et al, , 2006Elming, 2006, 2007). The results obtained are compared to a similar study performed on rock samples from an exploratory well at the Tjårrojåkka copper deposit in the same area (previously described also by .…”

Section: Introductionmentioning

confidence: 99%

Physical properties and petrologic description of rock samples from an IOCG mineralized area in the northern Fennoscandian Shield, Sweden

Sandrin

Edfelt

Waight

et al. 2009

Journal of Geochemical Exploration

Self Cite

View full text Add to dashboard Cite

Alteration paragenesis and mineral chemistry of the Tjårrojåkka apatite–iron and Cu (-Au) occurrences, Kiruna area, northern Sweden

Cited by 44 publications

References 31 publications

Hydrothermal fluid evolution and metal transport in the Kiruna District, Sweden: Contrasting metal behaviour in aqueous and aqueous–carbonic brines

Hydrothermal fluid evolution and metal transport in the Kiruna District, Sweden: Contrasting metal behaviour in aqueous and aqueous–carbonic brines

Reconnaissance-scale conceptual fuzzy-logic prospectivity modelling for iron oxide copper – gold deposits in the northern Fennoscandian Shield, Finland

Physical properties and petrologic description of rock samples from an IOCG mineralized area in the northern Fennoscandian Shield, Sweden

Contact Info

Product

Resources

About