Apatite in situ Lu-Hf and U-Pb geochronology in layered mafic intrusions from four major LMI localities: the Fe-Ti Boulder Lake North deposit (Duluth Complex, USA), the Upper Zone (Bushveld Complex, South Africa), the Nebo-Babel Intrusion (Giles Complex, Musgrave Province, Australia), and the Proterozoic anorthosite massifs of the Grader Intrusion and Lac Perron deposit (Grenville Province, Canada).