THE Sm-Nd AGE OF WOLLASTONITE SKARNS IN THE SOUTHERN BAIKAL REGION
S.I. Shkol'nik, V.P. Kovach*, L.Z. Reznitsky, and N.Yu. Zagornaya*
Institute of the Earth's Crust, Siberian Branch of the RAS, 128 ul. Lermontova, Irkutsk, 664033, Russia
* Institute of Geology and Geochronology of the Precambrian, 2 nab. Makarova, St. Petersburg, 199034, Russia
Keywords: Wollastonite, skarns, Sm-Nd age, southern Baikal region
Pages: 924-927
Subsection: PETROLOGY, GEOCHEMISTRY AND MINERALOGY
Abstract
The age of wollastonite skarns from the Andreevskoe deposit (Slyudyanka crystalline complex, southern Baikal region) has been determined by the Sm-Nd method. A Sm-Nd isochron was constructed by five points: garnet, clinopyroxene, wollastonite, K-feldspar, and bulk rock ( T = 419  19 Ma, MSWD = 1.8,  Nd = -6.5). Formation of wollastonite skarns marks the final stage of orogeny and rise of the complex to a hypabyssal level. |
