Figure 1. Location map of major structural elements in the south of the
Siberian Craton and the distribution of the rock complexes associated with the
evolution of the Neoproterozoic Supercontinent.
Legend: (1) Late Riphean basic dike swarms (Nersa Complex); (2) Middle
Riphean basic dike swarms: (a) Angaul Complex, (b) Chaya Complex; (3) basic
volcanic rocks (Middle Riphean); (4) Carbonate-terrigenous deposits of the
passive margin (Middle Riphean, Patoma Zone); (5) Late Riphean carbonate-terrigenous
deposits of the passive margin and transitional to the rocks of
collision origin (zones: (L) Lena zone, (BP) Baikal-Patoma zone, (B) Baikal
zone, and (S) Sayan zone); (6) metamorphic rock complexes, inferred to be the
rocks of the passive margin, which had been tectonically brought to contact
the fragments of island-arc rocks (Kh - Khamardaban, K - Kitoika, and
Dr - Derba complexes); (7-9) ophiolite belts: (7) Middle-Late Riphean (1.1-0.8
billion years) (I - Ilchira Belt); (8) Late Riphean-Vendian (0.7-0.55 billion
years) (D - Dzhida Belt); (9) Middle-Late Riphean and late Riphean-Vendian
(BM - Baikal-Muya Belt); (10) Early Precambrian terranes in the foldbelt
(G - Gargan, M - Muya, Am - Amalat); (11a) the modern boundary of the Siberian
Craton from geological and geophysical data, the craton is showed without its
Phanerozoic sedimentary cover; (11b) various faults and boundaries between
rock complexes; (12) Sayan-Baikal Foldbelt.
The letters denote the following major structural features of the
Siberian Craton margin: A - Akitka volcanoplutonic belt; B - Biryusa Block;
N - Nechera High; M - Maritime Zone; T - Tonod High; U - Ukuchikta Block;
UT - Urik-Tumansheta Zone; Ch - Chuya High; Sh - Sharyzhalgai Protrusion;
(I) Tungus, (II) Anabar, and (III) Aldan provinces. The black rectangles with
numbers denote the areas of detailed surveys and the numbers of the figures
referred to in the text.