关键词: 黑龙江东部, 鸡西盆地, 砾石统计, 白垩纪, 物源

Abstract: The results of gravel counting in different periods of cretaceous in Jixi basin shows that lower cretaceous gravel mainly consist of quartzite and granite, which is consistent with the outcrop lithology of pre-mesozoic basement in its periphery. In the contrast, rhyolite, andesite, tuff are growing in number in upper cretaceous Houshigou formation, and quartz sandstone and boulder clay can be found, hence indicating that the early mesozoic strata partly supply sediments. The shape of gravels chiefly changes from subangular to round, and the ratios between its long axis and short axis vary within 1?2 mostly, in small gravel primarily, particle size length conforms to the normal distribution. Sedimentary environment discriminant function displays that gravel mainly belong to rivers (delta) causes. Based on the analysis of gravels, the west of the basin and paleo-uplift supply sediments during the sedimentary stage of the Chengzihe formation. The deposition from Chengzihe formation to Muleng formation is the course of water expending. In the middle and late sedimentary stage of the Muleng formation, the western becomes the mainly continental provenance followed by the further expansion of the transgressive range. During late cretaceous, the basin and its periphery occurs uplift and subjects to erosion because intensely fold-thrusting, deposit Houshigou formation in the low-lying region.

Key words: eastern Heilongjiang, Jixi Basin, gravel counting, cretaceous, provenance