SmNd Garnet Ages from the Uluguru Granulite Complex of Eastern Tanzania: Further Evidence for Post-metamorphic Slow Cooling in the Mozambique Belt

Simple item page
dc.creatorMaboko, Makenya A. H.
dc.creatorNakamura, Eizo
dc.date2016-05-12T15:21:17Z
dc.date2016-05-12T15:21:17Z
dc.date1995
dc.date.accessioned2018-03-27T08:57:07Z
dc.date.available2018-03-27T08:57:07Z
dc.descriptionFull text can be accessed at http://www.sciencedirect.com/science/article/pii/030192689500008S
dc.descriptionTwo samples from the Uluguru granulite complex yield garnet SmNd ages of 633 ± 7 and 618 ± 16 Ma, similar to previously published hornblende 40Ar39Ar and KAr ages. The similarity of the SmNd to the KAr age suggests that the closure temperature of garnet to Nd diffusion is similar to that of hornblende to Ar diffusion. Assuming that published zircon UPb ages of about 700 Ma date peak granulite-facies metamorphism, a mean post-metamorphic cooling rate of 2–3°C/Ma can be calculated for the time interval 700 to 630 Ma. Such slow cooling rates imply thermal relaxation with a thickness length-scale greater than the thickness of average continental crust. This, in turn, implies that the thermal perturbation responsible for metamorphism was preceded by regional crustal thickening probably in a collisional orogen.
dc.identifierMaboko, M.A.H. and Nakamura, E., 1995. Sm Nd garnet ages from the Uluguru granulite complex of eastern Tanzania: further evidence for post-metamorphic slow cooling in the Mozambique belt. Precambrian Research, 74(4), pp.195-202.
dc.identifierhttp://hdl.handle.net/20.500.11810/1998
dc.identifier10.1016/0301-9268(95)00008-S
dc.identifier.urihttp://hdl.handle.net/20.500.11810/1998
dc.languageen
dc.publisherElsevier
dc.titleSmNd Garnet Ages from the Uluguru Granulite Complex of Eastern Tanzania: Further Evidence for Post-metamorphic Slow Cooling in the Mozambique Belt
dc.typeJournal Article

Files

Collections

Department of Geology