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A reconnaissance 40Ar/39Ar geochronologic study of ore-bearing and related rocks, Siberian Russia

Geochimica et Cosmochimica Acta

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Abstract

40Ar/39Ar age spectra of biotite from a mineralized vein in the ore-bearing, Noril'sk I intrusion and from picritic-like gabbrodolerite from the weakly mineralized, Lower Talnakh intrusion show that these bodies were emplaced at 249 ?? 2 Ma, which is not significantly different from the age of the Permian-Triassic boundary. The ore-bearing intrusions postdate the lower third of the flood-basalt sequence in the Noril'sk area and, on the basis of geochemistry, can best be correlated with lavas slightly younger than those which they cut. Thus, flood basalt was erupted at the time of the Permian-Triassic mass extinction event, although its role in this event is, as yet, ill defined. Additional new 40Ar/39Ar age data for a group of intrusive and extrusive rocks on the western margin of the Siberian craton are discussed. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A reconnaissance 40Ar/39Ar geochronologic study of ore-bearing and related rocks, Siberian Russia
Series title:
Geochimica et Cosmochimica Acta
Volume
59
Issue:
10
Year Published:
1995
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geochimica et Cosmochimica Acta
First page:
2071
Last page:
2083