Fig. 2. Geologic scheme and geologic section of the Talazhin massif (compiled after data of A.N. Smagin and A.V. Renzhin). 1 – 3 , Late Riphean Talazhin layered plagiodunite–troctolite–anorthosite–gabbro complex: 1 , plagiodunites, serpentinized plagiodunites, and apodunite serpentinites, 2

Fig. 3. Main types of rocks of the Talazhin massif. a , Plagiodunite; b , troctolite; c , olivine gabbro; d , anorthosite. Ol, olivine; Cpx, clinopyroxene; Hy, hypersthene; Hbl, hornblende; Mpy, monoclinic pyroxene; Srp, serpentine; CrSp, Cr-spinel; Czo, clinozoicite; Pl, plagioclase.

Fig. 4. Ore mineralization of rocks of the Talazhin massif. a – f , Description is in the text. Mgt (CrMgt), magnetite (Cr-magnetite); CrSp, Cr-spinel; Ilm, Ilmenite; Nig, nigrine; Po, pyrrhotite; Pn, pentlandite; Cpy, chalcopyrite; Ol, olivine; Rock, rock-forming silicate minerals.

Fig. 9. Equilibrium crystallization curves modeled using the KOMAGMAT-3.52 program ( Ariskin and Barmina, 2000 ) for the main intrusive rock varieties of the Talazhin massif. 1 , plagiodunite; 2 , troctolite; 3 , olivine gabbro; 4 , anorthosite.

Fig. 5. Diagrams of orientation of the optical-indicatrix axes of olivine in plagiodunites (samples 5014/7 and 1109) and troctolite (sample 5015/2) from the Talazhin massif. Constructed after 50 measurements of the optical indicatrix. Isolines: 1–2–4–6–8–10% per 1% of the Schmidt’s net

Fig. 6. Rock-forming oxides vs. MgO variation diagrams for rocks of the Talazhin ( 1 ), Yoko-Dovyren ( 2 ), and Voices Bay ( 3 ) massifs. Dotted line is the composition trend of cumulose phases obtained by modeling of the formation of the Talazhin layered intrusion based on the composition

Fig. 8. Primitive-mantle-normalized ( Sun and McDonough, 1989 ) spidergrams of the most abundant trace elements in rocks of the Talazhin, Yoko-Dovyren, and Voices Bay massifs. Designations follow Fig. 7 .

Fig. 7. Chondrite C I-normalized ( Anders and Grevesse, 1989 ) REE patterns of rocks of the Talazhin (samples 1093 and 5011), Yoko-Dovyren (samples k-1, k-2, and k-3), and Voices Bay (samples p-7 and p-57) massifs. For comparison, the patterns of layered peridotite–gabbro massifs of island-arc

Ordovician) volcanics; 3 , Ordovician leucogranite formation: Kuturchin complex; 4 , Cambrian–Ordovician red-colored terrigenous deposits of the Badzhei trough; 5 , Vendian– Lower Cambrian terrigenous-carbonate deposits; 6 , Middle–Upper Riphean Talazhin plagiodunite–troctolite–anorthosite–gabbro complex