THE NW-TRENDING TECTONIC-METALLOGENIC BELT OF NONFERROUS AND PRECIOUS METALS ON THE RIGHT BANK OF THE HEILONGJIANG RIVER AND ITS GEOLOGICAL IMPLICATION

A comprehensive analysis on the geographic, tectonic, geophysical and regional metallogenic data reveals the existence of the NW-trending Xiaoxinganling tectonic-metallogenic belt of nonferrous and precious metals on the right bank of Heilongjiang River. The main part of the metallogenic belt, 1000 km long and 500 km wide, is along the NWtrending Xiaoxinganling mountain chains, in which the ore-controlling and hosting structures are distributed in northwest direction, with ore deposits occurring in a belt trending northwest. Geophysical data show that the metallogenic belt is consistent with a large lithospheric-asthenospheric structural anomaly zone. The regional geological data support the formation of the metallogenic belt through three tectonic-metallogenic evolution stages, which are the forming of landmass and active continental margin orogeny in the Pal-Asia tectonic domain, followed by active continental margin orogeny in the marginal-Pacific tectonic domain. The confirmation of the existence of this metallogenic belt is of great significance to better understand the tectonism-magmatism-metallogeny in East China.