New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield
New U-Th-Pb zircon data (SIMS) from three intrusive phases of the Palaeoproterozoic Viterliden intrusion in the western Skellefte District, central Fennoscandian Shield, dates igneous emplacement in a narrow time interval at about 1.89 Ga. A locally occurring quartz-plagioclase porphyritic tonalite,...
Published in: | Solid Earth |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2011
|
Subjects: | |
Online Access: | https://doi.org/10.5194/se-2-205-2011 https://doaj.org/article/5da02876576b4fd3bee4d52048e3d97e |
id |
ftdoajarticles:oai:doaj.org/article:5da02876576b4fd3bee4d52048e3d97e |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:5da02876576b4fd3bee4d52048e3d97e 2023-05-15T16:12:55+02:00 New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield P. Skyttä T. Hermansson J. Andersson M. Whitehouse P. Weihed 2011-10-01T00:00:00Z https://doi.org/10.5194/se-2-205-2011 https://doaj.org/article/5da02876576b4fd3bee4d52048e3d97e EN eng Copernicus Publications http://www.solid-earth.net/2/205/2011/se-2-205-2011.pdf https://doaj.org/toc/1869-9510 https://doaj.org/toc/1869-9529 doi:10.5194/se-2-205-2011 1869-9510 1869-9529 https://doaj.org/article/5da02876576b4fd3bee4d52048e3d97e Solid Earth, Vol 2, Iss 2, Pp 205-217 (2011) Geology QE1-996.5 Stratigraphy QE640-699 article 2011 ftdoajarticles https://doi.org/10.5194/se-2-205-2011 2022-12-31T14:34:36Z New U-Th-Pb zircon data (SIMS) from three intrusive phases of the Palaeoproterozoic Viterliden intrusion in the western Skellefte District, central Fennoscandian Shield, dates igneous emplacement in a narrow time interval at about 1.89 Ga. A locally occurring quartz-plagioclase porphyritic tonalite, here dated at 1889 ± 3 Ma, is considered the youngest of the intrusive units, based on the new age data and field evidence. This supports an existing interpretation of its fault-controlled emplacement after intrusion of the dominating hornblende-tonalite units, in this study dated at 1892 ± 3 Ma. The Viterliden magmatism was synchronous with the oldest units of the Jörn type early-orogenic intrusions in the eastern part of the district (1.89–1.88 Ga; cf. Gonzàles Roldán, 2010). A U-Pb zircon age for a felsic metavolcanic rock from the hanging-wall to the Kristineberg VMS deposit, immediately south of the Viterliden intrusion, is constrained at 1883 ± 6 Ma in this study. It provides a minimum age for the Kristineberg ore deposit and suggests contemporaneous igneous/volcanic activity throughout the Skellefte District. Furthermore, it supports the view that the Skellefte Group defines a laterally continuous belt throughout this "ore district". Tentative correlation of the 1889 ± 3 Ma quartz-plagioclase porphyritic tonalite with the Kristineberg "mine porphyry" suggests that these units are coeval at about 1.89 Ga. Based on the new age determinations, the Viterliden intrusion may equally well have intruded into or locally acted as a basement for the ore-hosting Skellefte Group volcanic rocks. Article in Journal/Newspaper Fennoscandian Directory of Open Access Journals: DOAJ Articles Kristineberg ENVELOPE(18.667,18.667,79.483,79.483) Solid Earth 2 2 205 217 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 Stratigraphy QE640-699 |
spellingShingle |
Geology QE1-996.5 Stratigraphy QE640-699 P. Skyttä T. Hermansson J. Andersson M. Whitehouse P. Weihed New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield |
topic_facet |
Geology QE1-996.5 Stratigraphy QE640-699 |
description |
New U-Th-Pb zircon data (SIMS) from three intrusive phases of the Palaeoproterozoic Viterliden intrusion in the western Skellefte District, central Fennoscandian Shield, dates igneous emplacement in a narrow time interval at about 1.89 Ga. A locally occurring quartz-plagioclase porphyritic tonalite, here dated at 1889 ± 3 Ma, is considered the youngest of the intrusive units, based on the new age data and field evidence. This supports an existing interpretation of its fault-controlled emplacement after intrusion of the dominating hornblende-tonalite units, in this study dated at 1892 ± 3 Ma. The Viterliden magmatism was synchronous with the oldest units of the Jörn type early-orogenic intrusions in the eastern part of the district (1.89–1.88 Ga; cf. Gonzàles Roldán, 2010). A U-Pb zircon age for a felsic metavolcanic rock from the hanging-wall to the Kristineberg VMS deposit, immediately south of the Viterliden intrusion, is constrained at 1883 ± 6 Ma in this study. It provides a minimum age for the Kristineberg ore deposit and suggests contemporaneous igneous/volcanic activity throughout the Skellefte District. Furthermore, it supports the view that the Skellefte Group defines a laterally continuous belt throughout this "ore district". Tentative correlation of the 1889 ± 3 Ma quartz-plagioclase porphyritic tonalite with the Kristineberg "mine porphyry" suggests that these units are coeval at about 1.89 Ga. Based on the new age determinations, the Viterliden intrusion may equally well have intruded into or locally acted as a basement for the ore-hosting Skellefte Group volcanic rocks. |
format |
Article in Journal/Newspaper |
author |
P. Skyttä T. Hermansson J. Andersson M. Whitehouse P. Weihed |
author_facet |
P. Skyttä T. Hermansson J. Andersson M. Whitehouse P. Weihed |
author_sort |
P. Skyttä |
title |
New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield |
title_short |
New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield |
title_full |
New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield |
title_fullStr |
New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield |
title_full_unstemmed |
New zircon data supporting models of short-lived igneous activity at 1.89 Ga in the western Skellefte District, central Fennoscandian Shield |
title_sort |
new zircon data supporting models of short-lived igneous activity at 1.89 ga in the western skellefte district, central fennoscandian shield |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/se-2-205-2011 https://doaj.org/article/5da02876576b4fd3bee4d52048e3d97e |
long_lat |
ENVELOPE(18.667,18.667,79.483,79.483) |
geographic |
Kristineberg |
geographic_facet |
Kristineberg |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
Solid Earth, Vol 2, Iss 2, Pp 205-217 (2011) |
op_relation |
http://www.solid-earth.net/2/205/2011/se-2-205-2011.pdf https://doaj.org/toc/1869-9510 https://doaj.org/toc/1869-9529 doi:10.5194/se-2-205-2011 1869-9510 1869-9529 https://doaj.org/article/5da02876576b4fd3bee4d52048e3d97e |
op_doi |
https://doi.org/10.5194/se-2-205-2011 |
container_title |
Solid Earth |
container_volume |
2 |
container_issue |
2 |
container_start_page |
205 |
op_container_end_page |
217 |
_version_ |
1765998523152596992 |