Proterozoic to Mesozoic East Gondwana: the juxtaposition of India, Sri Lanka, and Antarctica

Article Abstract:

A Proterozoic to Mesozoic reconstruction of Gondwana using paleomagnetic and geologic data from Sri Lanka and Antarctica examines their tectonic fit. Sri Lanka is relocated to the Lutzow-Holm Bay in East Antarctica. Tectonic, lithologic, and structural characteristics of the Sri Lankan Highland Group facies correspond to those of the Lutzow-Holm Bay. The fit orientation suggests that Sri Lanka underwent 30 degrees of clockwise rotation with respect to present-day India, and 80 km of north lateral movement. Results suggest that this region of Gondwana experienced little disruption throughout that period.

History, Continental drift, Paleogeography

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Changing magmatic and tectonic styles along the paleo-Pacific margin of Gondwana and the onset of early Paleozoic magmatism in Antarctica

Article Abstract:

Zircon and titanite U-Pb investigations for basement calc-alkaline rocks in southern Victoria Land and the Scott Glacier area, Antarctica, reveal late Early Cambrian or younger ages. Deformational events may have an association with a strike or oblique-slip regime, as suggested by the absence of definite arc magmatism before 530 Ma. Compressional deformation, and rare alkaline and carbonatite magmatism could be due to local transpressional and transtensional domains. Transition of the paleo-Pacific margin of Gondwana from a passive to an active margin is discussed.

Observations, Paleozoic Era, Rocks, Igneous, Igneous rocks

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Early Permian transform margin development of the Southern New England orogen, Eastern Australia (Eastern Gondwana)

Article Abstract:

A study was conducted to analyze the development of the southern New England orogen. The structure forms part of the eastern margin of Gondwana. Fault-bounded, narrow, elongate, rapidly filled sedimentary basins provide basis that the orogen developed from a high-angle plate convergence zone in the Carboniferous period into either a transform or highly obique-convergent margin of the Early Permian period.

Natural history, New England, Permian period

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