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Hydrocarbons associated with lead–zinc ores at Laisvall, Sweden

Nature volume 255, pages 131–133 (1975)Cite this article

Abstract

BITUMEN and a series of normal alkanes (C18 to C27) have been identified in sphalerite from the Laisvall lead–zinc deposit. This is a stratabound lead–zinc ore in Eocambrian sandstone, situated at the eastern border of the Swedish Caledonides. The deposit is an aberrant member of the Mississippi Valley ore class1. The main ore minerals are galena and sphalerite, associated with minor amounts of calcite, barite and fluorite. These infill interstices around the sandgrains, often following sedimentary structures2. The lead is markedly radiogenic J-type with a 206Pb/204Pb ratio of more than 20 (ref. 3). Fluid inclusion studies on the sphalerite give homogenisation temperatures around 150 °C (ref. 4). Laisvall is the largest lead concentration (original resources of about 60 × 106 t of 4% Pb) in the 1,000km long lead- and zinc-rich Caledonian border zone, which includes deposits such as Dorotea and Vassbo.

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Authors and Affiliations

  1. Geologiska Institutionen, Stockholms Universitet,

    DAVID T. RICKARD & M. WILLDEN

  2. Karolinska Institutet, Laboratory for mass spectrometry, Stockholm, Sweden

    Y. MÅRDE & R. RYHAGE

Authors
  1. DAVID T. RICKARD
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  2. M. WILLDEN
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  3. Y. MÅRDE
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  4. R. RYHAGE
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RICKARD, D., WILLDEN, M., MÅRDE, Y. et al. Hydrocarbons associated with lead–zinc ores at Laisvall, Sweden. Nature 255, 131–133 (1975). https://doi.org/10.1038/255131a0

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