Detrital zircon geochronology in the Dora-Maira and Zone Houillere: a record of sediment travel paths in the Carboniferous

作者：Manzotti Paola^*; Ballevre Michel; Poujol Marc

来源：Terra Nova, 2016, 28(4): 279-288.

DOI：10.1111/ter.12219

In the internal zone of the European Alps, late Carboniferous to Permian sediments have been detached from their basement (e.g. the Zone Houillere in the Brianconnais Zone). The Pinerolo Unit (Dora-Maira Massif) is the deepest unit exposed in the stack of the Western Alps and is considered to be Carboniferous in age based on lithological considerations. Detrital zircon grains from the Pinerolo Unit and the Zone Houillere display similar age patterns, with the youngest and largest population being Carboniferous (340-330Ma). The distribution of Carboniferous magmatism in the Alps and surrounding areas suggests that the detritus was transported from Maures-Corsica and possibly from the Helvetic Zone into the Zone Houillere and the Pinerolo basin. Our results highlight the potential of detrital zircon geochronology for deciphering the sources of detrital material in meta-sediments, even if they have been affected by metamorphic overprints.

• 出版日期2016-8