Differential Neoproterozoic to Palaeozoic postcollisional cooling histories across the Lúrio Belt, northeast Mozambique

• Main Authors: Jacobs, Joachim, Ueda, Kosuke, Thomas, Robert J., Kosler, Jan, Horstwood, Matthew S.A., Wartho, Jo-Anne, Jordan, Fred, Emmel, Benjamin, Matola, Rogerio
• Format: Text
• Language: English
• Published: Geological Society of Africa 2013
• Subjects: Earth Sciences; Antarctic; Antarc*
• Online Access: http://nora.nerc.ac.uk/id/eprint/21390/; https://nora.nerc.ac.uk/id/eprint/21390/1/Jacobs_Moz_abstract_Cag_24_RJT.pdf; http://www.cag24.org.et/

The East African-Antarctic Orogen maks one of the major collision zones in the amalgamation of Gondwana. The tectonic style of the orogen changes abruptly across the Lúrio Belt in its southern part in northeast Mozambique. The orogen north of the Lúrio Belt is characterized by W- to NW-directed nappe stacking, whilst to the south, large volumes of late-tectonic granitoids and charnockites point towards elevated heat flow and possibly a delaminated orogenic root. Further evidence for delamination is given by structures associated with penetrative extension, high-temperature/low-pressure metamorphism, migmatisation and late-tectonic constriction perpendicular to the main collision vector. We have traced the postcollisional tectonic development across the Lúrio Belt and its subsequent cooling from high-temperature metamorphism with an extensive new set of U-Pb titanite, 40Ar/39Ar hornblende, and 40Ar/39Ar mica analyses.