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Bastutjärn Ni-Cu-Co mineralisering
2013 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Bastutjärn Ni-Cu-Co mineralization is located within a gabbroic intrusion approx. 10 km north-east of Norsjö village in the south-central parts of the world class massive sulphide Skellefte District. The mineralization is situated at the contact zone between a gabbroic unit, classified as gabbronorite, and a graphite- and sulphide-rich metasedimentary unit. Three different types of mineralization occurs, a disseminated low grade, extensive volume with disseminated pyrrhotite, a semi-massive pyrrhotite mineralization and a semi-massive pyrrhotite mineralization-rich in graphite and sedimentary fragments. Ore bearing minerals are solely pyrrhotite, pentlandite and chalcopyrite. Formation of the Bastutjärn Ni-Cu-Co deposit includes an involvement of sulphur from the surrounding crustal rocks to achieve sulphide immiscibility. The separated droplets of sulphides creates layers of more massive mineralization. The contact zone between the two rock units is consisting of an area where a major mixing process has occurred, which can be seen by xenoliths and hybridization of the gabbroic rock. Large amount of graphite is found within the mineralization, suggesting that an intense mixing with the surrounding sedimentary unit took place during formation.

Place, publisher, year, edition, pages
2013. , 61 p.
Keyword [en]
Life Earth Science
Keyword [sv]
Bio- och geovetenskaper, Malmgeologi
URN: urn:nbn:se:ltu:diva-54298Local ID: b3f6d2f6-4b05-4243-b3cb-05ec5ebc5da1OAI: diva2:1027679
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Subject / course
Student thesis, at least 30 credits
Educational program
Natural Resources Engineering, master's
Validerat; 20130912 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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