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K-bentonites in the Argentine Precordillera contemporaneous with rhyolite volcanism in the Famatinian Arc

Fanning, Christopher; Pankhurst, Robert J; Rapela, Carlos W; Baldo, Edgardo; Casquet, Cesar; Galindo, Carmen

Description

New U-Pb radiometric dates for K-bentonite horizons within the Lower Cambrian to Middle Ordovician platform carbonates from the Precordillera terrane of NW Argentina provide further constraints on models for the allochthonous or parautochthonous accretion of this terràne. Two K-bentonite layers from the Talacasto section yield indistinguishable sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon dates of 469.5 + 3.2 Ma and 470.1 ± 3.3 Ma respectively. These are within uncertainty of...[Show more]

CollectionsANU Research Publications
Date published: 2004
Type: Journal article
URI: http://hdl.handle.net/1885/86466
Source: Journal of the Geological Society
DOI: 10.1144/0016-764903-130

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