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Geochronology of th...
Geochronology of the Kiruna iron ores and hydrothermal alterations
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- Romer, Rolf L. (author)
- Luleå tekniska universitet,Laboratoire de Géochronologie, Université Paris, Paris, France; Institut de Physique du Globe de Paris, Paris, France
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- Martinsson, Olof (author)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Perdahl, Jan-Anders (author)
- Luleå tekniska universitet
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(creator_code:org_t)
- 1994-10-01
- 1994
- English.
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In: Economic geology and the bulletin of the Society of Economic Geologists. - : Society of Economic Geologists. - 0361-0128 .- 1554-0774. ; 89:6, s. 1249-1261
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.2...
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Abstract
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- The magnetite-apatite iron ores at Kiruna are hosted in a suite of alkaline volcanic and subvolcanic rocks that was formed in a short time interval of about 20 m.y. between 1900 and 1880 Ma. U-Pb dating of titanite from magnetite-titanite dikes in the footwall of the Luossavaara orebody indicates that the age of the magnetite-apatite ores is 1888 + or - 6 Ma. Titanite-actinolite-calcite assemblages in amygdules are related to the hydrothermal and metasomatic alteration of the wall rocks and the ore. The U-Pb titanite age of the amygdule fill is 1876 + or - 9 Ma. The geographic distribution of the alteration suggests that it is not related to the formation of the iron ores. The youngest major magmatic units in the Kiruna area are 1792 + or - 4 Ma syenites that intruded the supracrustal rocks. The Kiruna area underwent a weak metamorphic overprint during the Caledonian orogeny. Our data are inconsistent with a hydrothermal event at ca. 1.5 Ga as has been suggested earlier.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- Malmgeologi
- Ore Geology
Publication and Content Type
- ref (subject category)
- art (subject category)
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