Age of the Au-Ag mineralization and its relation to the magmatism at the Dess occurrence, North Stanovaya metallogenic zone (southeastern framing of the North-Asian Craton)

Abstract

Mesozoic ore systems were responsible for the formation of numerous Au, Ag, Mo, and Pb occurrences and deposits in the North-Stanovaya metallogenic zone, the largest of which are the Bamskoe, Vykhodnoe, Mogotinskoe, Dess, Nakhodka, and Apsakan deposits. The age of the hydrothermal-metasomatic processes that accompanied the mineralization is 130–122 Ma, which allows us to relate the ore formation to the origin of the granitoids of the Tynda-Bakaran complex (138–124 Ma). The latter rocks form large intrusions united into the Stanovoi Belt in the southeastern framing of the North-Asian Craton. The ore objects change in the sequence Au-Ag-Au-Mo(Au) from the south northward and are restricted to the contact zones of intrusions of the Stanovoi Belt, which were probably formed at the transform continental margin.