The Aldan Shield geological region coincides geographically with parts of the
Aldan Highlands and
Olyokma-Chara Plateau, located at the southern end of the
Sakha Republic and the eastern end of
Irkutsk Oblast.[2]
The exposed crust parts of the shield date back to the
Archean and reflect the first phases of accretion of the crust. They only emerge in a few areas, the eastern and northern sectors of the shield being largely covered by sediments accumulated between the end of the
Precambrian and the
Cambrian, while in the western and southern regions they have undergone processes of tectonic rejuvenation that have brought about the formation of new structures above and below.[3][1][4]
On the Aldan Shield there is the only
charoite deposit known in the world - the Sirenevyi Kamen (Lilac Stone) of the
Murun Massif. Many other rare and unusual minerals occur in the area of the shield, such as
brookite,
frankamenite,
tausonite and
yuksporite.[5][6]