TY - JOUR

T1 - Genesis of Manganese Ore Occurrences of the Olkhon Terrane the Western Baikal Region

AU - Sklyarov, E. V.

AU - Lavrenchuk, A. V.

AU - Starikova, A. E.

AU - Fedorovsky, V. S.

AU - Khromova, E. A.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Geological and mineralogical data are reported on the manganese occurrences of the Olkhon terrane (Western Baikal region), which are localized in metadolerites of the Ustkrestovsky Complex, high-temperature mafic hornfels, granites, calcitic marbles and calciphyres, and occasionally are developed as separate veins in gneiss granites or small lenses in quartzites. Most of them are made up of high-temperature mineral assemblages (Opx + Cpx + Pl + Ilm ± Grt ± Bt ± Amp), the main manganese carriers in which are ferrorhodonite (33–36 wt % MnO), orthopyroxene (6–12 wt % MnO), and ilmenite (3–16 wt % MnO). Obtained data are in conflict with traditional concepts that these rocks are gondites (manganese-rich metamorphosed sediments) or that manganese flux in carbonate sediments was related to the volcanic activity that occurred simultaneously with sedimentation at about 500 Ma. The diversity of manganese occurrences was produced by metasomatic processes that occurred almost simultaneously with regional metamorphism and emplacement of subalkaline mafic bodies during collisional tectonogenesis (about 470 Ma).

AB - Geological and mineralogical data are reported on the manganese occurrences of the Olkhon terrane (Western Baikal region), which are localized in metadolerites of the Ustkrestovsky Complex, high-temperature mafic hornfels, granites, calcitic marbles and calciphyres, and occasionally are developed as separate veins in gneiss granites or small lenses in quartzites. Most of them are made up of high-temperature mineral assemblages (Opx + Cpx + Pl + Ilm ± Grt ± Bt ± Amp), the main manganese carriers in which are ferrorhodonite (33–36 wt % MnO), orthopyroxene (6–12 wt % MnO), and ilmenite (3–16 wt % MnO). Obtained data are in conflict with traditional concepts that these rocks are gondites (manganese-rich metamorphosed sediments) or that manganese flux in carbonate sediments was related to the volcanic activity that occurred simultaneously with sedimentation at about 500 Ma. The diversity of manganese occurrences was produced by metasomatic processes that occurred almost simultaneously with regional metamorphism and emplacement of subalkaline mafic bodies during collisional tectonogenesis (about 470 Ma).

KW - manganese occurrences

KW - metamorphism

KW - metasomatism

KW - Olkhon terrane

KW - Western Baikal region

KW - CARBONATE

KW - ZONE

KW - COMPLEXES

KW - SIBERIA

KW - MAGMATISM

UR - http://www.scopus.com/inward/record.url?scp=85064562684&partnerID=8YFLogxK

U2 - 10.1134/S0869591119010041

DO - 10.1134/S0869591119010041

M3 - Article

AN - SCOPUS:85064562684

VL - 27

SP - 79

EP - 94

JO - Petrology

JF - Petrology

SN - 0869-5911

IS - 1

ER -