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Mineralogisk och malmpetrografisk studie av disseminerade sulfider i rika och fattiga prover från Kleva

Björk, Andreas LU (2013) In Examensarbeten i geologi vid Lunds universitet GEOL01 20131
Department of Geology
Abstract
The Kleva copper-nickel sulphide mineralization in Jonkoping County, southeastern Sweden, is categori-sed as an elongated mafic pluton. In this study, ore microscopy and quantitative chemical analysis using SEM -EDS have been used to describe the relative abundance and distribution of sulphides and iron oxides in disseminated samples. The overall dominant mineral ore phase is chalcopyrite. In the richer samples it is associated with pyrrho-tite and inclusions of iron oxides. In samples of lower grade, pyrite is the most dominant sulphide also filling out
aertheritic textures of granular magnetite, and bordering ilmenite grains. Pentlandite is common in all samples but only contains Co in richer samples while with higher Ni content in... (More)
The Kleva copper-nickel sulphide mineralization in Jonkoping County, southeastern Sweden, is categori-sed as an elongated mafic pluton. In this study, ore microscopy and quantitative chemical analysis using SEM -EDS have been used to describe the relative abundance and distribution of sulphides and iron oxides in disseminated samples. The overall dominant mineral ore phase is chalcopyrite. In the richer samples it is associated with pyrrho-tite and inclusions of iron oxides. In samples of lower grade, pyrite is the most dominant sulphide also filling out
aertheritic textures of granular magnetite, and bordering ilmenite grains. Pentlandite is common in all samples but only contains Co in richer samples while with higher Ni content in samples of lower grade. The results presented here are interpreted in a model of enrichment in the ore. It is proposed that tension caused an influx of a magma
poor in sulfur that reheated and altered the chemical balance of the already partly crystallized body. (Less)
Abstract (Swedish)
Kleva koppar-nickel -sulfidmineralisering i Jönköpings län associeras med en elongerad mafisk pluton. I denna studie presenteras de opaka faserna för disseminerad malm från platsen. De relativt rika resp. fattiga proverna skiljer sig åt texturellt och mineralogiskt. Prover med nätverkstexturer rymmer magnetkis medan de med enbart aggregat domineras av pyrit. Kobalt saknas i pentlandit från de fattigare proverna men utgör en säkerställd del i de rikare proverna. Samtidigt är andelen Ni hos samma mineral större i fattigare prover, främst ifrån lokalen
Mörka gången. Samma lokal visar optiskt tydligast tecken på förändringar hos magman i form av resorbtion av sulfider. Järnoxiderna magnetit och ilmenit förekommer som inklusioner i sulfiderna... (More)
Kleva koppar-nickel -sulfidmineralisering i Jönköpings län associeras med en elongerad mafisk pluton. I denna studie presenteras de opaka faserna för disseminerad malm från platsen. De relativt rika resp. fattiga proverna skiljer sig åt texturellt och mineralogiskt. Prover med nätverkstexturer rymmer magnetkis medan de med enbart aggregat domineras av pyrit. Kobalt saknas i pentlandit från de fattigare proverna men utgör en säkerställd del i de rikare proverna. Samtidigt är andelen Ni hos samma mineral större i fattigare prover, främst ifrån lokalen
Mörka gången. Samma lokal visar optiskt tydligast tecken på förändringar hos magman i form av resorbtion av sulfider. Järnoxiderna magnetit och ilmenit förekommer som inklusioner i sulfiderna eller som enskilda aggregat. Interna sprickor hos magnetit har fyllts av kopparkis resp. pyrit. Resultaten tolkas som att mineraliseringen tidigt
under sitt viloläge hettades upp på nytt till följd av tension och ett inflöde av sulfidfattig magma rubbade balansen i den delvis redan kristalliserade magman. (Less)
Please use this url to cite or link to this publication:
author
Björk, Andreas LU
supervisor
organization
alternative title
Mineralogy and ore petrology of disseminated ore from Kleva
course
GEOL01 20131
year
type
M2 - Bachelor Degree
subject
keywords
disseminerad malm, mineralisering, Kleva, koppar-nickel, copper nickel mineralization, disseminated ore.
publication/series
Examensarbeten i geologi vid Lunds universitet
report number
365
language
Swedish
id
4076172
date added to LUP
2013-11-08 12:08:12
date last changed
2013-11-08 12:08:12
@misc{4076172,
  abstract     = {The Kleva copper-nickel sulphide mineralization in Jonkoping County, southeastern Sweden, is categori-sed as an elongated mafic pluton. In this study, ore microscopy and quantitative chemical analysis using SEM -EDS have been used to describe the relative abundance and distribution of sulphides and iron oxides in disseminated samples. The overall dominant mineral ore phase is chalcopyrite. In the richer samples it is associated with pyrrho-tite and inclusions of iron oxides. In samples of lower grade, pyrite is the most dominant sulphide also filling out 
aertheritic textures of granular magnetite, and bordering ilmenite grains. Pentlandite is common in all samples but only contains Co in richer samples while with higher Ni content in samples of lower grade. The results presented here are interpreted in a model of enrichment in the ore. It is proposed that tension caused an influx of a magma 
poor in sulfur that reheated and altered the chemical balance of the already partly crystallized body.},
  author       = {Björk, Andreas},
  keyword      = {disseminerad malm,mineralisering,Kleva,koppar-nickel,copper nickel mineralization,disseminated ore.},
  language     = {swe},
  note         = {Student Paper},
  series       = {Examensarbeten i geologi vid Lunds universitet},
  title        = {Mineralogisk och malmpetrografisk studie av disseminerade sulfider i rika och fattiga prover från Kleva},
  year         = {2013},
}