Geochemistry of the stratiform iron Dunderlandsdalen deposits, Nordland
The Dunderlandsdalen iron district, Northern Norway, hosts a world-class stratiform Fe-mineralization (total tonnage of ~500 Mt at 33% Fe). The iron ore units belong to the Dunderland Formation in the Ramnålia Nappe, which further belongs to the Rødingsfjellet Nappe of the Caledonian Uppermost Alloc...
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ftunivtroemsoe:oai:munin.uit.no:10037/15396 2023-05-15T16:02:47+02:00 Geochemistry of the stratiform iron Dunderlandsdalen deposits, Nordland Rolsted Lie, Kristian 2019-05-15 https://hdl.handle.net/10037/15396 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway https://hdl.handle.net/10037/15396 openAccess Copyright 2019 The Author(s) VDP::Mathematics and natural science: 400::Geosciences: 450::Mineralogy petrology geochemistry: 462 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Mineralogi petrologi geokjemi: 462 GEO-3900 Master thesis Mastergradsoppgave 2019 ftunivtroemsoe 2021-06-25T17:56:35Z The Dunderlandsdalen iron district, Northern Norway, hosts a world-class stratiform Fe-mineralization (total tonnage of ~500 Mt at 33% Fe). The iron ore units belong to the Dunderland Formation in the Ramnålia Nappe, which further belongs to the Rødingsfjellet Nappe of the Caledonian Uppermost Allochthon. Hematite and magnetite represent the principal ore minerals and are hosted by amphibolite grade dolomitic and calcitic marble units intercalated with various types of calcareous schists. Although having been described as a world-class iron deposit, it has not been a subject of detailed geochemical studies. In order to determine the controlling mechanisms of hematite and magnetite formation, the present study mainly focuses on investigating the geochemical characteristics of the mineralization and host rocks within a structural framework. In addition, the fluid inclusion study gives insight into the post-ore P-T-X evolution of the studied area. Deformation processes, recrystallization of ore and gangue minerals as well as remobilization of metals during the Caledonian Orogeny affected the ore textures and mineral chemistry of the mineralization. Strain variations in ore bodies and host rocks, which are evident in both macro- and micro-scale, have given rise to different generations of Fe-oxides characterized by significantly different morphologies. The major element characteristics and REE patterns of mineralized samples indicate that the primary mineralizing events involved mixing of a low-temperature hydrothermal source of iron with a detrital component in a rift-related environment. ????�13C and ????�18O values of gangue carbonates support a deposition under the influence of hydrothermal fluids. Geochemical data, along with the age interval of host rock marble (800 to 730 Ma, Melezhik et al., 2015) have led the author to suggest that the Fe-mineralization of the Dunderland Formation accumulated in glacially and hydrothermally influenced passive margin rift-basins or back-arc basins. Fluid inclusion studies of recrystallized quartz witness a complex post-ore tectonic evolution during the Caledonian Orogeny. Master Thesis Dunderlandsdalen Nordland Nordland Northern Norway Nordland University of Tromsø: Munin Open Research Archive Dunderland ENVELOPE(14.839,14.839,66.446,66.446) Dunderlandsdalen ENVELOPE(14.823,14.823,66.447,66.447) Norway Ramnålia ENVELOPE(13.999,13.999,66.418,66.418) |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450::Mineralogy petrology geochemistry: 462 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Mineralogi petrologi geokjemi: 462 GEO-3900 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450::Mineralogy petrology geochemistry: 462 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Mineralogi petrologi geokjemi: 462 GEO-3900 Rolsted Lie, Kristian Geochemistry of the stratiform iron Dunderlandsdalen deposits, Nordland |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450::Mineralogy petrology geochemistry: 462 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Mineralogi petrologi geokjemi: 462 GEO-3900 |
description |
The Dunderlandsdalen iron district, Northern Norway, hosts a world-class stratiform Fe-mineralization (total tonnage of ~500 Mt at 33% Fe). The iron ore units belong to the Dunderland Formation in the Ramnålia Nappe, which further belongs to the Rødingsfjellet Nappe of the Caledonian Uppermost Allochthon. Hematite and magnetite represent the principal ore minerals and are hosted by amphibolite grade dolomitic and calcitic marble units intercalated with various types of calcareous schists. Although having been described as a world-class iron deposit, it has not been a subject of detailed geochemical studies. In order to determine the controlling mechanisms of hematite and magnetite formation, the present study mainly focuses on investigating the geochemical characteristics of the mineralization and host rocks within a structural framework. In addition, the fluid inclusion study gives insight into the post-ore P-T-X evolution of the studied area. Deformation processes, recrystallization of ore and gangue minerals as well as remobilization of metals during the Caledonian Orogeny affected the ore textures and mineral chemistry of the mineralization. Strain variations in ore bodies and host rocks, which are evident in both macro- and micro-scale, have given rise to different generations of Fe-oxides characterized by significantly different morphologies. The major element characteristics and REE patterns of mineralized samples indicate that the primary mineralizing events involved mixing of a low-temperature hydrothermal source of iron with a detrital component in a rift-related environment. ????�13C and ????�18O values of gangue carbonates support a deposition under the influence of hydrothermal fluids. Geochemical data, along with the age interval of host rock marble (800 to 730 Ma, Melezhik et al., 2015) have led the author to suggest that the Fe-mineralization of the Dunderland Formation accumulated in glacially and hydrothermally influenced passive margin rift-basins or back-arc basins. Fluid inclusion studies of recrystallized quartz witness a complex post-ore tectonic evolution during the Caledonian Orogeny. |
format |
Master Thesis |
author |
Rolsted Lie, Kristian |
author_facet |
Rolsted Lie, Kristian |
author_sort |
Rolsted Lie, Kristian |
title |
Geochemistry of the stratiform iron Dunderlandsdalen deposits, Nordland |
title_short |
Geochemistry of the stratiform iron Dunderlandsdalen deposits, Nordland |
title_full |
Geochemistry of the stratiform iron Dunderlandsdalen deposits, Nordland |
title_fullStr |
Geochemistry of the stratiform iron Dunderlandsdalen deposits, Nordland |
title_full_unstemmed |
Geochemistry of the stratiform iron Dunderlandsdalen deposits, Nordland |
title_sort |
geochemistry of the stratiform iron dunderlandsdalen deposits, nordland |
publisher |
UiT Norges arktiske universitet |
publishDate |
2019 |
url |
https://hdl.handle.net/10037/15396 |
long_lat |
ENVELOPE(14.839,14.839,66.446,66.446) ENVELOPE(14.823,14.823,66.447,66.447) ENVELOPE(13.999,13.999,66.418,66.418) |
geographic |
Dunderland Dunderlandsdalen Norway Ramnålia |
geographic_facet |
Dunderland Dunderlandsdalen Norway Ramnålia |
genre |
Dunderlandsdalen Nordland Nordland Northern Norway Nordland |
genre_facet |
Dunderlandsdalen Nordland Nordland Northern Norway Nordland |
op_relation |
https://hdl.handle.net/10037/15396 |
op_rights |
openAccess Copyright 2019 The Author(s) |
_version_ |
1766398466307653632 |