Constraints on the source and evolution of mineralising fluids in the Norrbotten Fe oxide-Cu-Au province, Sweden
Norbotten County, Sweden, is well known for the iron oxide-apatite deposits of the Kiruna and Malmberget areas. These are spatially associated with iron oxide Cu (+-Au) deposits and a genetic link between the two has been suggested as a part of the IOCG spectrum of deposits. Here we report the resul...
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ftunivbrighton:oai:eprints.brighton.ac.uk:2049 2023-05-15T17:04:16+02:00 Constraints on the source and evolution of mineralising fluids in the Norrbotten Fe oxide-Cu-Au province, Sweden Smith, Martin Gleeson, Sarah A. 2005 http://eprints.brighton.ac.uk/2049/ unknown Smith, Martin and Gleeson, Sarah A. (2005) Constraints on the source and evolution of mineralising fluids in the Norrbotten Fe oxide-Cu-Au province, Sweden In: 8th biennial conference of the Society for geology applied to mineral deposits, Beijing, China. F600 Geology Contribution to conference proceedings in the public domain PeerReviewed 2005 ftunivbrighton 2018-12-03T19:48:54Z Norbotten County, Sweden, is well known for the iron oxide-apatite deposits of the Kiruna and Malmberget areas. These are spatially associated with iron oxide Cu (+-Au) deposits and a genetic link between the two has been suggested as a part of the IOCG spectrum of deposits. Here we report the results of a fluid inclusion microthermometry and bulk crush leach halogen and chlorine stable isotope study, carried out to test that hypothesis. Quartz veins from late stage veins from Fe-oxide-apatite deposits and Cu-(Au) deposits contain hypersaline brine inclusions, with a salinity range of 32 to 38wt.% NaCl eq. in Fe-oxide bodies, and of 38 to 47wt.% NaCl eq. in Cu-Au deposits. In Cu-(Au) deposits these are sometimes accompanied by CO2-rich inclusions. The Cl/Br ratio of the fluid inclusion leachates is consistent with magmatic fluid compositions, and ranges between 859 and 9597, with no distinction between the Fe-oxide samples and the Cu-mineralizing brines. d[delta]37Cl(SMOW) values range from -0.99 to -5.63 0/00. The data are far removed from both mantle (d[delta]37Cl=+4.7 0/00) and crustal (d[delta]37Cl=0 0/00) values and must represent fractionation of the isotopes during the mineralizing process. We suggest that this fractionation occurred during the formation of Cl-rich mineral phases commonly found associated with the deposits e.g. scapolite, biotite and amphibole. Text Kiruna Malmberget Norrbotten UBR (University of Brighton Repository) Kiruna |
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F600 Geology Smith, Martin Gleeson, Sarah A. Constraints on the source and evolution of mineralising fluids in the Norrbotten Fe oxide-Cu-Au province, Sweden |
topic_facet |
F600 Geology |
description |
Norbotten County, Sweden, is well known for the iron oxide-apatite deposits of the Kiruna and Malmberget areas. These are spatially associated with iron oxide Cu (+-Au) deposits and a genetic link between the two has been suggested as a part of the IOCG spectrum of deposits. Here we report the results of a fluid inclusion microthermometry and bulk crush leach halogen and chlorine stable isotope study, carried out to test that hypothesis. Quartz veins from late stage veins from Fe-oxide-apatite deposits and Cu-(Au) deposits contain hypersaline brine inclusions, with a salinity range of 32 to 38wt.% NaCl eq. in Fe-oxide bodies, and of 38 to 47wt.% NaCl eq. in Cu-Au deposits. In Cu-(Au) deposits these are sometimes accompanied by CO2-rich inclusions. The Cl/Br ratio of the fluid inclusion leachates is consistent with magmatic fluid compositions, and ranges between 859 and 9597, with no distinction between the Fe-oxide samples and the Cu-mineralizing brines. d[delta]37Cl(SMOW) values range from -0.99 to -5.63 0/00. The data are far removed from both mantle (d[delta]37Cl=+4.7 0/00) and crustal (d[delta]37Cl=0 0/00) values and must represent fractionation of the isotopes during the mineralizing process. We suggest that this fractionation occurred during the formation of Cl-rich mineral phases commonly found associated with the deposits e.g. scapolite, biotite and amphibole. |
format |
Text |
author |
Smith, Martin Gleeson, Sarah A. |
author_facet |
Smith, Martin Gleeson, Sarah A. |
author_sort |
Smith, Martin |
title |
Constraints on the source and evolution of mineralising fluids in the Norrbotten Fe oxide-Cu-Au province, Sweden |
title_short |
Constraints on the source and evolution of mineralising fluids in the Norrbotten Fe oxide-Cu-Au province, Sweden |
title_full |
Constraints on the source and evolution of mineralising fluids in the Norrbotten Fe oxide-Cu-Au province, Sweden |
title_fullStr |
Constraints on the source and evolution of mineralising fluids in the Norrbotten Fe oxide-Cu-Au province, Sweden |
title_full_unstemmed |
Constraints on the source and evolution of mineralising fluids in the Norrbotten Fe oxide-Cu-Au province, Sweden |
title_sort |
constraints on the source and evolution of mineralising fluids in the norrbotten fe oxide-cu-au province, sweden |
publishDate |
2005 |
url |
http://eprints.brighton.ac.uk/2049/ |
geographic |
Kiruna |
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Kiruna |
genre |
Kiruna Malmberget Norrbotten |
genre_facet |
Kiruna Malmberget Norrbotten |
op_relation |
Smith, Martin and Gleeson, Sarah A. (2005) Constraints on the source and evolution of mineralising fluids in the Norrbotten Fe oxide-Cu-Au province, Sweden In: 8th biennial conference of the Society for geology applied to mineral deposits, Beijing, China. |
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1766058342866747392 |