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The drift history of Iran from the Ordovician to the Triassic

2009; Geological Society of London; Volume: 312; Issue: 1 Linguagem: Inglês

10.1144/sp312.2

2041-4927

Giovanni Muttoni, Massimo Mattei, Marco Balini, Andréa Zanchi, Maurizio Gaetani, Fabrizio Berra,

Geology and Paleoclimatology Research

Abstract New Late Ordovician and Triassic palaeomagnetic data from Iran are presented. These data, in conjunction with data from the literature, provide insights on the drift history of Iran as part of Cimmeria during the Ordovician–Triassic. A robust agreement of palaeomagnetic poles of Iran and West Gondwana is observed for the Late Ordovician–earliest Carboniferous, indicating that Iran was part of Gondwana during that time. Data for the Late Permian–early Early Triassic indicate that Iran resided on subequatorial palaeolatitudes, clearly disengaged from the parental Gondwanan margin in the southern hemisphere. Since the late Early Triassic, Iran has been located in the northern hemisphere close to the Eurasian margin. This northward drift brought Iran to cover much of the Palaeotethys in approximately 35 Ma, at an average plate speed of c . 7–8 cm year −1 , and was in part coeval to the transformation of Pangaea from an Irvingian B to a Wegenerian A-type configuration.