Ca. Smit et al., Structural-metamorphic evolution of the Southern Yenisey Range of Eastern Siberia: implications for the emplacement of the Kanskiy granulite Complex, MINER PETR, 69(1-2), 2000, pp. 35-67
The Southern Yenisey Range of Eastern Siberia consists of the granulite fac
ies Kanskiy Complex bordered in the west by the lower-grade Yeniseyskiy and
Yukseevskiy Complexes. Three deformational events were recognized in each
of the three complexes along the Yenisey River cross-section: a D1 fabric f
orming event, a D2 shear and folding event, and a D3 shear event. Thrust ki
nematics across the Southern Yenisey Range suggest that during the D2 event
the Kanskiy Complex was thrusted along a regional ductile shear zone onto
the lower-grade complexes. This resulted in shearing and folding as well as
the development of a dynamic metamorphic zonation. In the low-grade greens
tone belt part of the cross section (Yukseevskiy complex) D2 shearing is as
sociated with peak prograde (T similar to 660 degrees C and P similar to 5.
8 kbar) metamorphism. The retrograde P-T path of the Yukseevskiy Complex co
incides with minimum Tof the near-isobaric cooling P-T paths for the adjace
nt granulites of the Kanskiy Complex (Perchuk et al., 1989). The metamorphi
sm can therefore be attributed to deformation and heat transfer caused by e
xhumation of the Kanskiy Complex in the time period 2000-1800 Ma which also
defines the most significant tectono-thermal event in the Southern Yenisey
Range. The tectono-metamorphic pattern and evolution of the low- to high-g
rade metamorphic complexes of the Southern Yenisey Range is very similar to
that described for the similar to 2600 Ma Limpopo Complex of Southern Afri
ca and the similar to 1900 Ma Lapland Complex of the Kola Peninsula. Simila
r geodynamic processes were therefore possibly responsible for the formatio
n of these high-grade terrains suggesting that their formation is linked to
a general geodynamic model.