Metallogenic Zones in the Central Segment of the Amur Gold-Bearing Province

摘要

The Amur province represents a large gold-bearing structure approximately 250 km~2 in size, which extends in the sublatitudinal direction along the Tuku-ringra and Dzhagdy ranges on the left side of the middle reaches of the Amur River. The province is confined to the zone of Mesozoic collision of the rigid plates of the Aldan-Stanovoi geoblock and the Amur composite massif with the Mongol-Okhotsk fold system located between them. It comprises nine metallogenic zones with three of them located in the central part of the province being most promising: Yan-kan, Dzheltulak, and Dzhagdy-Selemdzha (Fig. 1). The zones extend in the northwestern, sublatitudinal direction for over hundreds of kilometers being tens of kilometers wide. The Yankan metallogenic zone extends along the large-amplitude closely spaced Northern Tukuringra and Southern Tukuringra faults, which border the Aldan-Stanovoi, Mongol-Okhotsk, and Amur geoblocks. The Dezheltulak fault zone hosts the synonymous metallogenic zone. The Dzhagdy-Selemdzha zone contacts the Southern Tukuringra fault in the north. The conjunction between the Dzheltulak and Southern Tukuringra faults is marked by the Zeya-Gilyui structure of the central type initiated in the lower crust. All the above-mentioned faults represent the main ore-controlling structures.