Study of opaque phases in carbonatites of the Grønnedal-Íka alkaline complex, Southwest Greenland
Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Opaque phases from carbonatites of the Grønnedal-Íka alkaline complex (1299±17 Ma) of Southwest Greenland were analyzed in terms of their mineralogy and microstructure. The analysis demonstrates that a later intrusion by a 55 m wide dolerite dyke of unknown age has prompted the mineralization of magnetite by activating hydrothermal fluid convection. The fluid has interacted with the carbonatite, replacing siderite and ankerite by magnetite, which at places constitutes over half of the rock volume. Magnetite is shown to have become partly replaced by hematite at a later stage. A paragenetic sequence is suggested for the opaque phases that com- prise major magnetite and hematite, accessory pyrite and trace amounts of sphalerite, chalcopyrite and galena.
Place, publisher, year, edition, pages
2015. , 66 p.
carbonatite, opaque phases, oxides, magnetite, hydrothermal fluids, Grønnedal-Íka, Greenland
IdentifiersURN: urn:nbn:se:su:diva-117831OAI: oai:DiVA.org:su-117831DiVA: diva2:816527
2015-06-03, Ahlmannsalen, Svante Arrhenius väg 8, Stockholm, 09:00 (English)
Stockmann, Gabrielle, Post-doctoral researcherPitcairn, Iain, Senior lecturer
Dupraz, Christophe, Senior lecturerKylander, Malin, Senior lecturer
ProjectsLow-temperature geologic sequestration of carbon by ikaite formation