TY - JOUR

T1 - Sources and Age of the Gold Mineralization of the Irokinda Deposit, Northern Transbaikalia

T2 - Evidence from Pb, S, Sr, and Nd Isotope-Geochemical and 39Ar–40Ar Geochronological Data

AU - Chugaev, A. V.

AU - Dubinina, E. O.

AU - Chernyshev, I. V.

AU - Travin, A. V.

AU - Kossova, S. A.

AU - Larionova, Yu O.

AU - Nosova, A. A.

AU - Plotinskaya, O. Yu

AU - Oleinikova, T. I.

AU - Sadasyuk, A. S.

N1 - Funding Information: We are grateful to Yu.A. Kostitsyn and A.V. Ivanov for comments, which helped us to improve our manuscript. We also are grateful to V.V. Yarmolyuk and E.Yu. Rytsk for given material on the alkaline rocks of the Synnyr Massif. Publisher Copyright: © 2020, Pleiades Publishing, Ltd. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/11/1

Y1 - 2020/11/1

N2 - Numerous orogenic gold deposits of different age, scale, and mineralization type are located within Northern Transbaikalia. Among them, there is a large group of Early Permian deposits, whose sources and relationships with Late Paleozoic magmatism remain debatable. These issues were solved by the example of the middle-scale (~24 t, Au) Irokinda deposit, localized within the Precambrian rocks of the Baikal–Muya Terrane. 39Ar–40Ar geochronological dating of the ore-hosting altered rocks indicates that hydrothermal–metasomatic process took place about 270 myr ago. Gold mineralization has heterogeneous Pb-, S-, Sr-, and Nd-isotopic characteristics. Variations in the Pb, S, Sr, and Nd isotopic composition of ore and gangue minerals suggest that the mineral-forming components were involved in the hydrothermal system from different sources. Among them, the leading role belonged to the rocks of the Precambrian crust of the Baikal–Muya Terrane. Pb isotopic composition of the second identified source is close to that of the Early Permian alkaline and subalkaline rocks of the Baikal–Muya Terrane. This fact may indicate a genetic relationship between the Irokinda gold mineralization and intraplate alkaline magmatism, which developed in the region simultaneously with ore-forming processes.

AB - Numerous orogenic gold deposits of different age, scale, and mineralization type are located within Northern Transbaikalia. Among them, there is a large group of Early Permian deposits, whose sources and relationships with Late Paleozoic magmatism remain debatable. These issues were solved by the example of the middle-scale (~24 t, Au) Irokinda deposit, localized within the Precambrian rocks of the Baikal–Muya Terrane. 39Ar–40Ar geochronological dating of the ore-hosting altered rocks indicates that hydrothermal–metasomatic process took place about 270 myr ago. Gold mineralization has heterogeneous Pb-, S-, Sr-, and Nd-isotopic characteristics. Variations in the Pb, S, Sr, and Nd isotopic composition of ore and gangue minerals suggest that the mineral-forming components were involved in the hydrothermal system from different sources. Among them, the leading role belonged to the rocks of the Precambrian crust of the Baikal–Muya Terrane. Pb isotopic composition of the second identified source is close to that of the Early Permian alkaline and subalkaline rocks of the Baikal–Muya Terrane. This fact may indicate a genetic relationship between the Irokinda gold mineralization and intraplate alkaline magmatism, which developed in the region simultaneously with ore-forming processes.

KW - Baikal–Muya Terrane

KW - Nd isotopic composition

KW - ore sources

KW - orogenic gold deposits

KW - Pb

KW - S

KW - Sr

KW - MATTER

KW - Baikal-Muya Terrane

KW - FLOOD BASALTS

KW - U-PB

KW - CONTINENTAL-CRUST

KW - MASSIF

KW - FLUID

KW - MC-ICP-MS

KW - LEAD-ISOTOPE

KW - CONSTRAINTS

KW - RB-SR

UR - http://www.scopus.com/inward/record.url?scp=85094929217&partnerID=8YFLogxK

U2 - 10.1134/S0016702920110051

DO - 10.1134/S0016702920110051

M3 - Article

AN - SCOPUS:85094929217

VL - 58

SP - 1208

EP - 1227

JO - Geochemistry International

JF - Geochemistry International

SN - 0016-7029

IS - 11

ER -