黑龙江省东部残留盆地群早白垩世沉积相特征及演化

Sedimentary facies characteristics and their evolution of the Early Cretaceous relict basins in eastern Heilongjiang Province

黑龙江省东部残留盆地群早白垩世主要充填滴道组(裴德组)、城子河组(七虎林组和云山组)、穆棱组(珠山组)和东山组。沉积相以冲积扇相、(扇)三角洲相、湖泊相、海相等为主。沉积相研究结果表明,滴道组以冲积扇及(扇)三角洲粗碎屑沉积为主,并伴随有火山岩分布,反映了盆地初始裂陷阶段的沉积环境特点;城子河组和穆棱组沉积时期,三江地区处于整体下沉阶段,现今残留的三江盆地、勃利盆地、鸡西盆地、虎林盆地、宁安盆地、鹤岗盆地和汤原断陷等为统一的近海拗陷盆地,张广才岭—小兴安岭及东三江和完达山地区是盆地主要物源供给区,平面上构成(扇)三角洲—滨浅湖—半深湖—湖底扇的沉积格局,并且伴随有多次海侵事件,海侵方向主要来自虎林盆地东部及绥滨坳陷北部;东山组沉积时期,盆地已明显萎缩,发育局限的(扇)三角洲—滨浅湖相沉积。

The Early Cretaceous relict basins in eastern Heilongjiang Province were filled with the Didao （Peide） Formation, Chengzihe （Qihulin and Yunshan） and Muling （Zhushan） formations and Dongshan Formation from the bottom to the top. The sedimentary facies are dominated by the alluvial fan, （fan） delta, lacustrine facies, marine facies etc. The sedimentary facies analyses indicate that the Didao Formation is mainly composed of alluvial fan and （fan） delta coarse-grained clastic deposits, with intercalation of volcanic rocks, which shows the sedimentary environment characteristics for early stage of rifting. During the deposition of the Chengzihe （Qihulin and Yunshan） and Muling （Zhushan） formations, the basins were sagging and the present-day relict Sanjiang, Boli, Jixi, Hulin, Ning＇an and Hegang basins as well as the Tangyuan faulted Depression formed a uniform neritic depressional basin. The Zhangguangcailing Mountain-Xiaoxing＇anling Mountain, Dongsanjiang and Wandashan areas are the primary provenances and （fan） delta-shallow lake-semi-lake-lacustrine bottom fan facies were mainly developed with several episodes of transgression which were dominantly from the eastern Hulin Basin and the northern Suibin Depression. During the deposition of the Dongshan Formation, the basin obviously shrank and local （fan） delta-shallow lake sedimentary facies were developed.