Maboko, M. A. H. & 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, Precambran Research, 74, 195-202, doi: 10.1016/0301-9268(95)00008-S. < 20150915164155-363703 > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    Two 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.

  • doi: 10.1016/0301-9268(95)00008-S
  • modified at 4 h ago


(a) TIMS on TIMS Finnigan MAT261, MAT262 and Triton TI
Tixhr1661685140 thumb MOR9 < 20181001102716-445806 >pub
  • IGSN: IEDRM00RD
  • classification: metamorphic
  • physical-form: hand specimen
  • quantity (kg): 1.095
  • description: meta-anorthosite
  • modified at 2019-09-05
Tixhr 1319510519 thumb MOR17 < 20181001102925-875805 >pub
  • IGSN: IEDRM00RF
  • classification: metamorphic
  • physical-form: hand specimen
  • quantity (kg): 0.74
  • description: granulite
  • modified at 2019-09-05
name box-type global-id
binder of Sm-Nd garnet ages from the Uluguru granulite complex of Eastern Tanzania: further evidence for post-metamorphic slow cooling in the Mozambique belt pub container 20190905143551-637723
name device size global-id
MOR9 WR pub TIMS Finnigan MAT261, MAT262 and Triton TI 4 20190905141934-213991
MOR17 WR pub TIMS Finnigan MAT261, MAT262 and Triton TI 4 20190905141934-500951
MOR17Gt pub TIMS Finnigan MAT261, MAT262 and Triton TI 4 20190905141934-797419
MOR17Cp pub TIMS Finnigan MAT261, MAT262 and Triton TI 4 20190905141935-292701
MOR9Gt pub TIMS Finnigan MAT261, MAT262 and Triton TI 4 20190905141934-610439
name spots global-id
caption ID assembly stone
Table 1. Sm-Nd data pub 20190905142040-489994 Nd_(Maboko,1995) 5
manual
  • name
  • Maboko, M. A. H.
  • Nakamura, E.