天津滨海新区全新世沉积特征和沉积过程

从地貌、沉积和年代等方面分析了天津滨海新区的形成演变过程。研究区中部和南部主要为不同时期的古黄河三角洲,每期古黄河三角洲发育时均形成前三角洲、三角洲前缘和潮间带等沉积层序,三角洲的不同部位分别形成河控三角洲和潮控三角洲,三角洲废弃后,形成三角洲平原—贝壳堤—滨海沙坝的地貌体系。研究区北部的沉积层序和地貌特征反映了少泥沙河流在海洋动力逐渐减弱条件下的河海相互作用过程。

Holocene Epoch Sedimentation Characteristics and Process in Tianjin New Coastal Region

The formation and development process of new coastal region in Tianjin were analyzed from such aspects as geomorphology,sedimentation and chronology.There were some old Yellow River deltas in different periods in the south and center of the region,each phase of these old Yellow River deltas developed into depositional sequence as prodelta,delta front and intertidal flat in vertical direction,and different part of these deltas formed tidal-dominated delta and river-dominated delta respectively early and always developed into deltaic plain-shell dike-beach ridge in transverse direction after delta discarded.The depositional sequence and geomorphology of northern part of research regain reflected sea-land interaction in the condition of the ocean dynamics weakening and little sediment supply.