The Svecokarelian anomalous ore lead line
作者:
DavidT. Rickard,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1978)
卷期:
Volume 100,
issue 1
页码: 19-30
ISSN:0016-786X
年代: 1978
DOI:10.1080/11035897809448556
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Ore lead isotope ratios from 37 deposits in the Svecokarelian of Fennoscandia are linearly related. Although the anomalous Svecokarelian ore lead line is generally compatible with the Stacey—Kramer two-stage model for the growth of primary lead, closer inspection reveals that the ore lead isotope variations are more consistent with a continuous mixing process. The anomalous lead line is consistent with Hietanen's plate tectonic model for the Fennoscandian Svecokarelinides. The ore lead isotope ratios are spatially related to a trench related to a sub-duction zone in the south-west of the region. This relationship is comparable to that observed in the 1.8-Ga younger Japanese island arc. The Svecokarelian leads are not true primary leads, and the mineralization age given by the Stacey—Kramer model is a minimum age. The apparent source age probably has no simple geological meaning.
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