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Uppsala University

1. Kinson, Siôn. Laser Ablation in Magnetites; Unravelling the Signatures of Trace Element Patterns for Ore Petrogenesis : Trace element signatures of magnetite linked to metallogenesis of iron mineralizations of the Kiruna type.

Degree: Earth Sciences, 2020, Uppsala University

Trace element analyses of magnetite samples from multiple ore deposits worldwide have recently been conducted, using both EPMA and LA-ICPMS, in order to try and understand the petrogenesis of Kiruna-type ore deposits. Here I employ literature data and new data from Kiruna and Grängesberg (Sweden) to help constrain and visualise evolutionary trends recorded by our samples and derive an overall model for the evolutionary processes that lead to Kiruna-type deposits. The evolutionary trend of a Kiruna-type ore from a primarily igneous source (orthomagmatic), into a more hydrothermally controlled system with alteration at a later (cooler) stage, has recently been put forward as a key explanation for how such deposits are formed, rivalling the idea of potential hydrothermal replacement to form such magnetite deposits. Trace element analysis of Kiruna-type magnetites show that the influence of hydrothermal activity may have occurred, subsequent to magmatic formational conditions, such as late stage hydrothermal interaction during the end of a volcanic cycle. An opportunity for further discussion derives from isolated values that do not plot in linear trends, i.e. Kiruna sample data, not plotting within the Kiruna field on a Ni/Cr+Mn vs. Ti+V discriminant diagram.

Spårelementsammansättningen i magnetit från järnmineraliseringar av Kiruna-typ världen över har använts för att försöka förstå ursprunget och utveckling av denna malm. I detta arbete har både litteratur- och ny EMP och LAICPMS-data från Kiruna och Grängesberg (Sverige) använts för att visa deras metallogenetiska utveckling samt för att ge en generell förklaringsmodell för de processer som leder till bildning av denna malmtyp. Bildning och utveckling av Kiruna-typmineraliseringar, från en övervägande magmatisk källa (ortomagmatisk) till ett hydrotermalt kontrollerat system under sjunkande temperaturer har nyligen föreslagits, som står i kontrast till tolkningen att de bildas genom hydrotermala ersättningsprocesser. Spårelementanalyser av magnetit från Kiruna-typmineraliseringar som presenteras i detta arbete visar att de, efter den magmatiska fasen, kan ha påverkats av hydrotermal aktivitet i anslutning till vulkanismens avklingande. Enstaka magnetiter från Kiruna plottar inte inom Kiruna-typfältet i Ni/Cr+Mn – Ti+V -diagram, och öppnar för en vidare diskussion om bildningen och utvecklingen av denna malmtyp.

Subjects/Keywords: EPMA; LA-ICPMS; petrogenesis; magnetite; orthomagmatic; igneous; hydrothermal; alteration; EPMA; LA-ICPMS; petrogenes; magnetit; ortomagmatisk; stollande; hydrotermisk; förändring; Geology; Geologi; Geochemistry; Geokemi

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kinson, S. (2020). Laser Ablation in Magnetites; Unravelling the Signatures of Trace Element Patterns for Ore Petrogenesis : Trace element signatures of magnetite linked to metallogenesis of iron mineralizations of the Kiruna type. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-404021

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Kinson, Siôn. “Laser Ablation in Magnetites; Unravelling the Signatures of Trace Element Patterns for Ore Petrogenesis : Trace element signatures of magnetite linked to metallogenesis of iron mineralizations of the Kiruna type.” 2020. Thesis, Uppsala University. Accessed February 28, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-404021.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Kinson, Siôn. “Laser Ablation in Magnetites; Unravelling the Signatures of Trace Element Patterns for Ore Petrogenesis : Trace element signatures of magnetite linked to metallogenesis of iron mineralizations of the Kiruna type.” 2020. Web. 28 Feb 2020.

Vancouver:

Kinson S. Laser Ablation in Magnetites; Unravelling the Signatures of Trace Element Patterns for Ore Petrogenesis : Trace element signatures of magnetite linked to metallogenesis of iron mineralizations of the Kiruna type. [Internet] [Thesis]. Uppsala University; 2020. [cited 2020 Feb 28]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-404021.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kinson S. Laser Ablation in Magnetites; Unravelling the Signatures of Trace Element Patterns for Ore Petrogenesis : Trace element signatures of magnetite linked to metallogenesis of iron mineralizations of the Kiruna type. [Thesis]. Uppsala University; 2020. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-404021

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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