Fold tectonics in Gondwana formations of India in Gondwana Five. Selected papers and abstracts of papers.
Gondwana formations occur as outliers on Precambrian rocks along eight prominent river valleys of India. Large-scale fold tectonics are postulated for the coal belts of Mahanadi, Wardha. Godavari, Pench-Kanhar, Ganga (Rajmahal), and Brahmaputra
(Eastern Himalaya), in addition to those earlier postulated for Damodar and Koel-Son Valley fields. It is also demonstrated that major faults, often forming present day boundary faults, were formed by block tectonics during the Tertiary period
in both tectonic style and timing. Relationships discussed in the paper suggest a migrating tectonic cycle from the African to the Australian sector of Gondwana from the late Precambrian through the middle Paleozoïc.
Crustal structures and tectonic significance of Antarctic rift zones (from geophysical evidence) in Gondwana Five. Selected papers and abstracts of papers.
Following compression, uplift and erosion of the rocks of the Rangitata Orogen (Carboniferous-Lower Cretaceous) a change to extensional tectonics occured in mid-Cretaceous times throughout the New Zealand region. A rift system developed on the West
Coast of the South Island, while a tectonically-controlled basin developed on the east coast of both islands. This early extensional phase was accompanied by volcanism ranging from rhyolitic to basaltic. The Late Cretaceous transgression and pene