The bio stratigraphy of the permian and triassic part 4 paleo magnetic evidence for large scale intra gondwana plate movements during the carboniferous to jurassic

Anderson, J.M.; Schwyzer, R.U.

Transactions of the Geological Society of South Africa 80(3): 211-234

1977


Accession: 006607136

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Abstract
Reinterpretation of paleopole data for the Carboniferous to Jurassic of Gondwanaland and North America is presented. Emphasis is placed on refining the inter-regional correlations of the host strata and in distinguishing between intervals of movement and relative stability of the participant landmasses. In order that these irregularities in plate movement should not be smoothed over in sequential reconstructions the concepts paleopole clan, clan mean and clan mean path are introduced and applied. Paleopole paths are plotted for the 8 different crustal units comprising Gondwanaland and North America. Although these paths are subject to improvement with incoming paleopole data and improved stratigraphic correlations, they appear sufficiently distinct to suggest marked relative lateral movement within Gondwanaland. Two sequences of 12 reconstructions are presented, i.e., one for Gondwanaland and one showing the western Gondwana/North American contact. The Gondwana reconstructions are briefly assessed with respect to elucidating the tectonic history of southern Africa and the spread and retreat of the Lower Permian glaciation.