Publikationsdatum:
2012-04-15
Beschreibung:
Terra Nova, 00, 1–9, 2012 Abstract Factor analyses were applied to trace element and magnetic susceptibility (MS) records of the Late Devonian palaeoceanographic ‘ punctata Event’ perturbation in the Western Canada Sedimentary Basin to constrain the extent to which geochemical anomalies were driven by 1) changes in clastic input (Factor 1; 55.1% of total variance) vs. 2) anoxia in the depositional environment (Factor 2; 35.2% of total variance). MS associates only with Factor 1 ( r = 0.971) and is significantly correlated (99.9% level) with acid-insoluble limestone residues and clastic proxies (Al, Si, K, Ti, Zr; r = 0.542–0.639). Based on XRD analyses of a small subset of these residues ( N = 7), a multivariate linear regression model accounts for 97.7% of total MS variance as a function of variable admixing of illite, pyrite, quartz and feldspar, in turn variably diluted by stratigraphic changes in the total carbonate content.
Print ISSN:
0954-4879
Digitale ISSN:
1365-3121
Thema:
Geologie und Paläontologie
Permalink