Unique Association of Native Gold Amalgam, Cinnabar, Native Metals, and Carbides from the Fadeevka Ore Placer Knot, Primorye

摘要

The Fadeevka ore placer knot is located at the transition between the Laoelin and Khanka terranes [1] (Fig. 1). The basal part of its stratified section is composed of basaltic-siliceous-tuffaceous, siliceous-clayey, argillaceous, and tuffaceous-sandy rocks (S_(1-2)). They are overlain by Permian volcanosedimentary sequences (P_(1-2)) and acid volcanics (P_2). Rocks of the volcanogenic-terrigenous complex enclosing black shales are intruded by large granitoid massifs in the south and small gabbroid and syenite bodies in the north [2]. Since the beginning of the 20th century, gold-PGE placers have been mined in this region from alluvial sediments of the Fadeevka and Zolotaya rivers, which drain granitoids and black shales, respectively. The region includes two productive associations known in the region. The first (Hg-Cu-Pd) association with gold, PGE minerals, and chromites is genetically related to the mafic-ultramafic complex. The second (argentiferous gold, sulfides, and quartz) association represents a product of granitoid volcanism [2, 3]. The purpose of this communication is to describe a new unique association of gold amalgam, cinnabar, native zinc, lead, iron, copper, and Si-Fe carbides. We used the gravitational concentrate of talus sediments and crushed bedrock samples from the drainage basin of right tributaries of the Zolotaya River. The sampling technique excluded their technogenic contamination.