Tectonism and eustasy in the Jurassic

Details Tectonism and eustasy in the Jurassic Tectonism and eustasy in the Jurassic

Mar 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969esrv....5...45h&link_type=abstract

Earth Science Reviews, Volume 5, Issue 1, p. 45-68.

Physics

5

Scientific paper

Intensive orogenic activity and vulcanicity during the Jurassic was largely confined to the circum-Pacific geosynclinal belt and the Caucasus-Crimea region of the Tethyan Belt. Notable vulcanicity also occurred within the stable shield regions of Africa, Australia and Antarctica. There was an increase of tectonic activity throughout the course of the period, reaching its climax at or near the close with a major phase of deformation, metamorphism and plutonism (Nevadan orogeny etc.). Lesser activity in the Middle Jurassic probably signifies a separate phase. The approximate areal percentage of continents covered by sea has been plotted for different stages and indicates a more or less gradual marine transgression from the Hettangian to the Oxfordian, interrupted by a notable regression only in the early Bathonian. A major regression took place towards the close of the Jurassic. The regressions are attributable either to widespread epeirogenic uplift on the continents contemporaneous with the late Jurassic orogenic events or to subsidence of oceanic trenches provoking a eustatic fall of sea level or, most likely, to a combination of these factors. The transgression is considered to be due essentially to eustatic rise of sea level, modified locally by topography and rate of subsidence. It is shown that elevation of the Darwin Rise in the Pacific was more than sufficient in amount and of the right order of speed to account for the Jurassic transgression. Interpretation of transgression as the dominant motif during most of the period may help to account for several important features of Jurassic stratigraphy.

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