A. O. Sobolev

Difficulties in identifying the Cenozoic Brusilovka Complex in the southern part of the East Sikhote-Alin Volcanic Belt

Abstract. It is important to substantiate the presence of the Cenozoic Salic Complex in the southern part of the East Sikhote-Alin Volcanic Belt, since its age formational analogues relate to gold-silver epithermal mineralization. The Brusilovka Complex is emphasized to be ore-generating for this type of mineralization, and above all, it is mistakenly confused with the Bogopol Complex due to the differences in metallogenic specialization, petrogenesis, age, and geodynamic conditions of its formation. The paper presents the author’s geological work findings within the Brusilovka volcanic structure, including the content of the Brusilovka Complex rocks, which refer to the contrasting basalt-trachyrhyolite association; the paper notes their similarity to the Kedrovka Volcanic Complex rocks. There are listed discrepancies in the current study of the Brusilovka Complex geochronology: ignoring previous tectonic zoning diagrams of the territory and material criteria for identifying volcanic complexes of the trachydacite-trachyrhyolite formation; insufficient sampling of volcanogenic formations taken not from the Brusilovka Complex stratotype; geological inaccuracies. It is necessary to resolve the dispute about the validity of identifying the Brusilovka Complex and comprehensively characterize the volcanogenic formations for reconstructing volcanic and tectonic structures.

Keywords: Primorsky Krai, East Sikhote-Alin Volcanic Belt, Zerkalninskoye polygenic volcanic and tectonic structure, Brusilovka Volcanic Graben, Paleocene, Eocene, felsic volcanism