ALLUVIAL GOLD PLACER IN WUTONGHE-DULUHE DRAINAGE AREA OF EASTERN HEILONGJIANG PROVINCE

Wutonghe-Duluhe drainage area is one of the major concentration area of gold placers in China. In this area, the metamorphic rock series of Lower Proterozoic Heilongjiang group, Mashan group and Cretaceous volcanic rocks are widespread, Late Proterozoic migmatitic granite and Variscan granite cover a large area and Yanshanian granite, granitic-porphyry are mostly small stock. are S-N faults the major structures in this area and NE- and NW-trending faults are also developed and charactreistic of muitiple activity. This area is a low mountain-hilly geomorphic country with dendritic drainage of Wutonghe-Duluhe river system.