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较为系统地探讨了区内晚白垩世泰州组沉积相类型、沉积特征,深入研究了泰州组各亚段沉积相平面分布及盆地沉积演化规律。研究表明,泰州组主要发育冲积扇、扇三角洲和湖泊3种主要沉积相类型。从盆地边缘到盆地中心,沉积相由冲积扇沉积逐渐变为扇三角洲或滨湖、浅湖、半深湖相沉积;自下而上由冲积扇沉积逐渐变为扇三角洲或滨湖,至浅湖、半深湖相,再到浅湖相沉积。晚白垩世泰州组沉积早期为断陷湖盆发育时期,以冲积扇、扇三角洲发育为特征;晚期为拗陷湖盆发育时期,湖平面持续上升,湖水加深,沉积范围扩大,浅湖相或半深湖相发育,而后湖平面下降,沉积物粒度变粗。
The types and sedimentary characteristics of sedimentary facies in the Late Cretaceous Taizhou Formation are systematically discussed, and the sedimentary facies distribution and sedimentary evolution in each sub-section of Taizhou Formation are studied in depth. The study shows that the Taizhou Formation is mainly composed of alluvial fan, fan delta and lake three kinds of major sedimentary facies. From the edge of the basin to the center of the basin, the sedimentary facies gradually changed from alluvial fan deposition to fan delta or lake, shallow lake and semi-deep lacustrine facies; from bottom to top, alluvial fan deposition gradually changed into fan delta or lake, Lakes, semi-deep lacustrine facies, then shallow lacustrine deposits. The Early Cretaceous Taizhou Formation was characterized by alluvial fan and fan delta development in the early period of sedimentary basin development. In the late period of depression basin, the lake level continued to rise, the lake deepened, the deposition area expanded, Semi-deep lacustrine facies developed, while the lake level decreased and the sediment grain size became thicker.