Broad-terrane Jurassic flood basalts across northeastern North America: comment and reply

Article Abstract:

McHone hypothesized that flood basalts used to cover the surface area of most of northeastern North America as indicated by the distribution of Early Jurassic tholeiites across the region. He also suggested that the combination of the distribution of extrabasinal dikes with basalts exposed in the Newark synrifts can be used to estimate the original covered surface area. However, it is argued that this approach has many significant shortcomings, including the forced acceptance of Russell's (1892) 'broad terrane hypothesis.' McHone defends his hypothesis.

North America, Natural history, Geology, Stratigraphic, Stratigraphy, Basalt, Floods, Jurassic period

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Jurassic paleopole controversy: contributions from the Atlantic-bordering continents

Article Abstract:

Apparent polar wander paths (APWP) for North America during the Mesozoic remain controversial. West Gondwana paleomagnetic data from the Andes, Spain, Italy and Lebanon are likely to have been locally rotated about a vertical axis and yielded 30 separate inclination values. Best estimates of North American paleopole locations were made from these data namely, lat 70 degrees north, long 135 degrees east in late Middle Jurassic, and 70 degrees north, 155 degrees east in the Late Jurassic.

Continental drift, Polar wandering

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Reply

Article Abstract:

The claim of non-discrimination of Grenvillian structural data may have been remiss but the contention that the structural data presented regarding extensional tectonics in Northwest Scotland is the first confirmation of Grenvillian crustal extension in the area stands. The documented interleaving of Lewisian basement and Moine cover was overlooked in the original publication as the age of this formation is yet to be resolved.

Morphotectonics

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