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Some new lead isotope determinations from the proterozoic sulfide ores of central Sweden

Johansson, A and Rickard, D 1985. Some new lead isotope determinations from the proterozoic sulfide ores of central Sweden. Mineralium Deposita 20 (1) , pp. 1-7. 10.1007/BF00204252

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Abstract

Lead isotope determinations were made on galenas from three strata-bound sulfide ores in the early Proterozoic (Svecokarelian) Bergslagen district of central Sweden and four epigenetic deposits in the Älvdalen and Vansbro districts in the early to middle Proterozoic post-Svecokarelian belt. The leads from the strata-bound Bergslagen deposits show exceptional isotopic homogeneity over large areas. Their isotopic composition suggests the existence of a pre-Svecokarelian crust in the district and is consistent with exhalative-sedimentary ore formation in an active continental margin environment. The Vansbro and Älvdalen leads display constant compositions within each district, but marked divergence between the districts. Their compositions preclude derivation exclusively from recycled Svecokarelian lead and suggest a substantial lead contribution from a mantle-like source. The difference between model ages and geologic ages for many of the deposits, with a small but significant excess of radiogenic lead, suggests a significant deviation of the Fennoscandian Shield from conventional global lead evolution models.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Springer Verlag
ISSN: 0026-4598
Last Modified: 19 Aug 2019 13:30
URI: http://orca.cf.ac.uk/id/eprint/120025

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