Situated in the Northwest Territories (Canada), the Cretaceous Little Nahanni Pegmatite Group (LNPG) is an LCT-type pegmatite swarm enriched in Li, Sn and Ta. Although studied in the past, the origin of this pegmatite group, as well as its internal evolution, remains poorly understood. The dike swarm consists of 200+ sub-vertical dikes intruding a suite of metasedimentary units in the Selwyn Basin. It is particularly well-exposed along a series of 13 glacial cirques. The LNPG is ca. 85 Ma [U-Pb columbite (Mauthner et al. 1995), U-Pb cassiterite and zircon (Kontak, unpub. data)] and represents the youngest...

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