A lithogeochemical study of northern Sweden and the Kiruna and Malmberget iron-apatite ore deposits
The iron apatite mineralizations of northern Sweden are mainly situated in supracrustal rocks and are thought to have formed during approximately the same time as the major plutonic suites in northern Sweden. In this thesis the Malmberget iron apatite ore deposit have been compared to the Kiruna iro...
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Uppsala universitet, Berggrundsgeologi
2014
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ftuppsalauniv:oai:DiVA.org:uu-227039 2023-05-15T16:32:55+02:00 A lithogeochemical study of northern Sweden and the Kiruna and Malmberget iron-apatite ore deposits Lundh, Jon 2014 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227039 eng eng Uppsala universitet, Berggrundsgeologi Examensarbete vid Institutionen för geovetenskaper, 1650-6553 289 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227039 info:eu-repo/semantics/openAccess REE trace elements iron-apatite ore deposit suite oxygen isotopes magnetite Kiruna Malmberget Haparanda Edefors Perthite-monzonite Student thesis info:eu-repo/semantics/bachelorThesis text 2014 ftuppsalauniv 2023-02-23T21:40:28Z The iron apatite mineralizations of northern Sweden are mainly situated in supracrustal rocks and are thought to have formed during approximately the same time as the major plutonic suites in northern Sweden. In this thesis the Malmberget iron apatite ore deposit have been compared to the Kiruna iron apatite ore deposit to see whether the role of hydrothermal processes are different between the two ore districts. Also, since it has proven problematic to distinguish between the different mafic and ultramafic members of the major plutonic suites in northern Sweden (i.e. the Haparanda suite (1.94-1.85 Ga), the Perthite-monzonite suite (PMS) (1.87 Ga) and the Edefors suite (1.80-1.79 Ga)), a second goal is to trace the distribution and distinguish between these suites. Major elements, REE and trace elements have been studied along with polished sections from the ores and oxygen isotopes of magnetites from the ore districts to trace the ore formation process and separate between suites. All ore districts display a close similarity in geochemistry between host rocks and magnetites, especially regarding the REE pattern. Oxygen isotopes show that samples from the Kiruna district plot exclusively at positive δ18O-values with the majority of them at values < 1‰. Samples from the Malmberget district display δ18O-values either close to the igenous range or at slightly negative values. However, samples that display very low or negative δ18O-values show signs of either high temperature hydrothermal alteration, oxidation or crustal contamination. The δ18O composition along with textural observations from the polished sections and geochemistry, points towards a magmatic origin for these deposits. No apparent evidence has been found to support a primary ore formation by hydrothermal process in any of the districts studied. Regarding the suites, normalized spider plot patterns of REEs and trace elements served as a basis for subdivision into groups by similarities in key identification parameters. Several patterns are ... Bachelor Thesis Haparanda Kiruna Malmberget Northern Sweden Uppsala University: Publications (DiVA) Edefors ENVELOPE(20.983,20.983,66.083,66.083) Haparanda ENVELOPE(24.137,24.137,65.835,65.835) Kiruna |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
REE trace elements iron-apatite ore deposit suite oxygen isotopes magnetite Kiruna Malmberget Haparanda Edefors Perthite-monzonite |
spellingShingle |
REE trace elements iron-apatite ore deposit suite oxygen isotopes magnetite Kiruna Malmberget Haparanda Edefors Perthite-monzonite Lundh, Jon A lithogeochemical study of northern Sweden and the Kiruna and Malmberget iron-apatite ore deposits |
topic_facet |
REE trace elements iron-apatite ore deposit suite oxygen isotopes magnetite Kiruna Malmberget Haparanda Edefors Perthite-monzonite |
description |
The iron apatite mineralizations of northern Sweden are mainly situated in supracrustal rocks and are thought to have formed during approximately the same time as the major plutonic suites in northern Sweden. In this thesis the Malmberget iron apatite ore deposit have been compared to the Kiruna iron apatite ore deposit to see whether the role of hydrothermal processes are different between the two ore districts. Also, since it has proven problematic to distinguish between the different mafic and ultramafic members of the major plutonic suites in northern Sweden (i.e. the Haparanda suite (1.94-1.85 Ga), the Perthite-monzonite suite (PMS) (1.87 Ga) and the Edefors suite (1.80-1.79 Ga)), a second goal is to trace the distribution and distinguish between these suites. Major elements, REE and trace elements have been studied along with polished sections from the ores and oxygen isotopes of magnetites from the ore districts to trace the ore formation process and separate between suites. All ore districts display a close similarity in geochemistry between host rocks and magnetites, especially regarding the REE pattern. Oxygen isotopes show that samples from the Kiruna district plot exclusively at positive δ18O-values with the majority of them at values < 1‰. Samples from the Malmberget district display δ18O-values either close to the igenous range or at slightly negative values. However, samples that display very low or negative δ18O-values show signs of either high temperature hydrothermal alteration, oxidation or crustal contamination. The δ18O composition along with textural observations from the polished sections and geochemistry, points towards a magmatic origin for these deposits. No apparent evidence has been found to support a primary ore formation by hydrothermal process in any of the districts studied. Regarding the suites, normalized spider plot patterns of REEs and trace elements served as a basis for subdivision into groups by similarities in key identification parameters. Several patterns are ... |
format |
Bachelor Thesis |
author |
Lundh, Jon |
author_facet |
Lundh, Jon |
author_sort |
Lundh, Jon |
title |
A lithogeochemical study of northern Sweden and the Kiruna and Malmberget iron-apatite ore deposits |
title_short |
A lithogeochemical study of northern Sweden and the Kiruna and Malmberget iron-apatite ore deposits |
title_full |
A lithogeochemical study of northern Sweden and the Kiruna and Malmberget iron-apatite ore deposits |
title_fullStr |
A lithogeochemical study of northern Sweden and the Kiruna and Malmberget iron-apatite ore deposits |
title_full_unstemmed |
A lithogeochemical study of northern Sweden and the Kiruna and Malmberget iron-apatite ore deposits |
title_sort |
lithogeochemical study of northern sweden and the kiruna and malmberget iron-apatite ore deposits |
publisher |
Uppsala universitet, Berggrundsgeologi |
publishDate |
2014 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227039 |
long_lat |
ENVELOPE(20.983,20.983,66.083,66.083) ENVELOPE(24.137,24.137,65.835,65.835) |
geographic |
Edefors Haparanda Kiruna |
geographic_facet |
Edefors Haparanda Kiruna |
genre |
Haparanda Kiruna Malmberget Northern Sweden |
genre_facet |
Haparanda Kiruna Malmberget Northern Sweden |
op_relation |
Examensarbete vid Institutionen för geovetenskaper, 1650-6553 289 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227039 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766022647323295744 |