IMPLICATIONS OF LITHOLOGY, GEOCHEMISTRY AND MICROFACIES FOR CAMBRIAN PALEOENVIRONMENTS, PALEOCLIMATE, AND PALEOGEOGRAPHY OF EASTERN NEWFOUNDLAND, CANADA
According to widely accepted concepts, the succession was deposited in a cold-water shelf to outer-marine environment. However, microfacies analysis indicates a sedimentary environment influenced by sea-level changes in a setting shallower than outer-shelf. Varying amounts of organic carbon in the succession suggest deposition under fluctuating levels of oxygenation, probably related to sea-level changes.
The Cambrian paleogeography and movements of Avalonia are subject to controversial interpretations. Due to an only moderate diagenetic overprint, analysis of detrital clay minerals enables paleoclimatic interpretations, which, in combination with interpretation of the depositional environments and the fossil record, challenges previous reconstructions of the palaeogeographic position of Avalonia and Cambrian climate.
Financial support by the Klaus Tschira Foundation (KTS 00.195.2011 and 00.272.2015) is gratefully acknowledged.