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Sn, B and Pb‐Zn Skarn, Vein and Disseminated Deposits in the East Sikhote–Alin, Russia

Abstract: Sn, B and Pb‐Zn skarn, vein and disseminated deposits occur in the eastern part of Sikhote‐Alin fold system associated with the late Cretaceous‐earliest Paleogene volcano‐plutonic complexes, which are products of a continental margin‐type subduction along the East Sikhote‐Alin belt. There are two metallogenic zones where the ore deposits are concentrated. The Taukha metallogenic zone combining B and Pb‐Zn skarn, vein and disseminated deposits occurs on the main volcanic chain along the Japan Sea coast. Late Cretaceous‐earliest Paleogene calc‐alkaline plutonic and volcanic rocks of magnetite series predominate here. Volcanic rocks overlie on the lower Cretaceous Taukha terrane which consists of abundant olistostromes with numerous olistoliths of Triassic limestones. During the middle‐late Cretaceous time, an ignimbrite erupted and formed a huge borosilicate skarn deposit. A later subduction related volcanism of the late Cretaceous‐earliest Paleogene stage (70–55 Ma) was predominated by andesites and rhyodacites. Many Pb‐Zn skarn and vein deposits were formed. Sulfur isotope compositions of galena in the B and Pb‐Zn deposits of the Taukha metallogenic zone vary from –1. 3 to +2. 0%, averaging 0% in the δ34S.