New styles of intrusive related copper-gold deposits in northern Sweden

LICENTIATE T H E S I S

New Styles of Intrusive Related Copper-Gold

Deposits in Northern Sweden

Therese Bejgarn

Department of Chemical Engineering and Geosciences Division of Geosciences

ISSN: 1402-1757 ISBN 978-91-7439-057-5 Luleå University of Technologyy 2009

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Printed by Universitetstryckeriet, Luleå 2009 ISSN: 1402-1757 ISBN 978-91-7439-057-5 Luleå  www.ltu.se Front cover

Left: Gold (yellow) among silicate minerals (black) and pyrite (beige).

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 a e c d b GIV GIII GI GII 5 k m N Tonalit e -Granodiorite ( Jörn Granitoid C o

mplex, GI) ~1885 Ma
'

P o rph y ritic intrusiv e (~1886 Ma in the Tallberg area)
Granodiorit e -Grantite ( Jörn Granitoid C o

mplex, GII) ~1873 Ma
'

C

o

arse grained Grantite (

Jörn Granitoid C o mplex, GIII) ~1865 Ma
Gabbro/h ybrid gabbr o F

inegrained mafic dykes _{Felsic metavolcanic rocks}

, Skellef te Group (~1885 M a)6 Meta volcanic rocks ,V argf

ors Group (~1875 Ma)6

Major faults/shear zones

Tonalitic enclaves M a g netit e -rich gabbro

Drill hole location in profiles

Intrusiv

e rocks

Supr

acrustal rocks

Alteration and mineralisation

Mafic enclaves Quar tz-porph yritic granodiorite ( GI), Älgträsk P

ropylitic altered quartz porph

yritic granodiorite (

GI, Älgträsk)

Älgliden ultramafic intrusion ~1876 Ma (preliminar

y age)4 Ductile def ormation H Hybrid r ock Crushed rock M

ineralised rock with ph

yllic to silicic alteration

(Ä lgträsk and Tallberg A u-zone) P ost-o rogenic granitoid

Gallejaur and Antak monzonite suite (~1875 Ma)5 Intermediate

-mafic metavolcanic rocks

, Skellf te and Ar vidsjaur Groups Metasedimenta ry rocks , Ar

vidsjaur Group (~1876 Ma)7

M

ineral deposit

a-e

In

trusive hosted mineral deposit

s Miscellaneous Ä W ilson et al. 1987 Ä Gonzáles-Roldán 2009 Ä W

eihed & Schöberg 1991

4Bejgarn, Söderber

g

, Årebäck

, W

eihed 2009 (unpublished data)

5 Sk iöld 1988 6Billström & W eihed 1996 7Sk iöld et al. 1993 Hy Legend , F igure 1 & 2 F resh to weak ly propylitic quar tz porph yritic granodiorite ( GI, Älgträsk)

Medium-grained laminated to ophitic olivine gabbronorit

e Medium-grained sulphide -bearing gabbronorite C oarse -g rained, Fe -T i o x

ide rich gabbronorite/olivingabbronorit

e F ine -g rained, Fe -T i o x

ide rich gabbronorite/olivingabbronorit

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Average data from 16 analyses of GI, from Gonzáles Roldán et al. (2007). Average data from 10 analyses of GI, from Wilson et al. (1987).

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