鸡西、勃利盆地白垩纪砂岩的物源分析及构造意义

鸡西、勃利盆地白垩纪砂岩骨架矿物成分的模式分析显示：下白垩统城子河组和穆棱组砂岩的源区主要为切割型岛弧，结合古水流方向和砂岩地球化学特征研究，物源区主要为小兴安岭-张广才岭；上白垩统猴石沟组砂岩的源区主要为基底隆升和切割型岛弧。结合古水流方向和砾石的统计结果认为，鸡西、勃利盆地物源区主要为桦南隆起和密山隆起，以及小兴安岭-张广才岭。据白垩纪砂岩物源，晚白垩世砾岩成分，以及区域地质资料分析，下白垩统城子河组和穆棱组时期，鸡西盆地、勃利盆地和黑龙江东部各盆地为统一的原型盆地，早白垩世末期随着桦南隆起和密山隆起的隆升而破坏。并在晚白垩世早期已隆升，并为周缘盆地提供物源，形成现今黑龙江东北部地区的盆岭格局。

Provenance analysis and tectonic implications for the Cretaceous sandstones in the Jixi and Boli Basins,Heilongjiang

The modal analysis of the Cretaceous sandstones from the Jixi and Boll Basins, Heilongjiang suggests that the provenance of the Lower Cretaceous Chengzihe Formation and Muleng Formation sandstones is a dissected island arc. The palaeocurrents and geochemical signatures of the sandstones have revealed that the major source areas are the Xiao Hingganling and Zhangguangcailing Mountains while the source areas of the Upper Cretaceous Houshigou Formation sandstones are the basement uplift and dissected island are. According to the palaeoeurrents and gravel compositional statistics, the source areas of the Jixi and Boli Basins consist of Huanan uplift, Mishan uplift, Xiao Hingganling and Zhangguangcailing Mountains. It is inferred from the provenance analysis of the Cretaceous sandstones, Late Cretaceous gravel compositional statistics and regional geological data that he Jixi, Boli and other basins in eastern Heilongjiang originally were once a unified protopyte basin during the Early Cretaceous （deposition of the Chengzihe and Muleng Formations）. This protopyte basin was subsequently subjected to the collapse with the uplifting of the Huanan and Mishan uplifts during the latest Early Cretaceous. Till the Late Cretaceous （deposition of the Houshigou Formation）, the Huanan and Mishan uplifts were constantly uplifted, and delivered the sediments for the surrounding basins. The present-day basin-range framework came into being in northeastern Heilongjiang at that time.