关键词: 兴华渡口群, 早—中元古代, 重磁解译, 反演, 大兴安岭

Abstract:

The Xinghuadukou Group belongs to the stratified metamorphic sequences of the Early-Middle Proterozoic. It is the oldest stratum in the Daxinganling Mountains, also the original source of gold mine, having crucial meaning for the forming of gold mine. Comparing with the Presinian migmatitic granites, this Group has higher density and susceptibility.According to the result of regional geological survey, the Xinhuadukou Group generated as shape as large or small blocks in the Presinian migmatitic granites. The distinct gravity and magnetic anomalies in the northeast Daxinganling Mountains indicate the existent of the large scale of Xinghuadukou Group in this area. In terms of the gravity and magnetic anomalies, moreover, through place-field conversion and integrated geological interpretation, deducing the extension and shape distributing of the Xinhuadukou Group, it is shown that the Xinghuadukou Group underlies the granites and has local uplift along SN and EW directions.The geological interpretation of gravity and magnetic anomalies is of significance for studying geological structure and its evolution, and for locating gold deposits

Key words: Xinghuadukou Group, Early-Middle Proterozoic, gravity and magnetic interpretation, inversion, Daxinganling Mountains