Dating an orogeny

Results - see Source 3 Delamerian events - timing and duration In the Kanmantoo Trough, in the Stansbury Basin, the earliest age of deep-water deposition of turbidites has been constrained to be mid-Early Cambrian by the age of zircons in a tuff horizon in the Normanville Group, that have been dated to 522 ± 2 Ma (Cooper et ., 1999), resulting in the beginning of the Delamerian Orogeny following at most 8 ± 6 My of deposition of sediment.At various widely dispersed places around the belt, such as the Peake and Denison Ranges (Bungadillina monazite; Morrison and Foden, 1990) in the far north, 513 ± 0.8 Ma, quartz porphyry intrusions in the Glenelg Inlier, Victoria, 514 ± 3 Ma (SHRIMP U-Pb on zircon; Ireland et , definitely prior to the intrusion of felsic dikes and sills that occurred at 487 Ma. to the authors2004) and before 500 Ma (felsic dikes at Cape Gantheaume that are undeformed).In the northwest, the Stuart Shelf was not affected and in the north and northeast, in the Cooper Basin and the Pedirka Basin limestones and shales were deposited.The zone of uplift and folding extended north through Adelaide, the seas over parts of the continent and the Gulf of Carpentaria retreating as the crust was uplifted and folded.Later, when plate tectonics became generally accepted, the term Pan-African was extended to all of the supercontinent Gondwana.

At about 514 Ma the first occurrence of strain fabrics and magmatism related to subduction, that included boninite, granite, and andesite lavas, occurred simultaneously in New Zealand, Victoria, South Australia, New South Wales and Tasmania is suggested by the authors to imply that ridge-push forces transmitted by the beginning of subduction, that was west-dipping, drove the Delamerian Orogeny.It saw the collision of the African and Eurasian plates, and the closure of the Tethys Ocean as oceanic lithosphere was subducted northwards beneath the Eurasian Plate, leaving today what we now know as the Mediterranean Sea.The continental collisions of the Alpine Orogeny formed the Alps, Pyrenees and Carpathian Mountains in Europe.The position of the continents by 50 million years ago looked quite similar to that of today.The Alpine Orogeny occurred mainly between 65 and 2.5 million years ago, although it is still active today.

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