滨海新区北塘晚更新世晚期以来的沉积环境特征及演化

文章以滨海新区北塘施工的第四系钻孔岩芯为研究对象,通过沉积岩石学、AMS~(14)C测年及微体生物特征综合分析,详细研究了晚更新世晚期以来该区地层的岩性特征、沉积相及其空间分布形态,认为本区晚更新世以来发育了一套海相—陆相—海相—陆相交互沉积的地层,成因类型包括冲积、湖沼沉积以及海积;晚更新世以来的沉积环境由滨海近岸浅海至河口湾、潟湖、滨海平原再至冲积平原的演变,总体上该区晚更新世晚期以来属于海陆交互作用及海进—海退的演变过程。

Sedimentary characteristics and environment evolution since the late Late-Pleistocene in the north Tanggu, Binhai New Area, Tianjin

Based on analysis of sedimentary petrology, ages of AMS ¹⁴C and characteristics of microorganism of core samples from bore holes operated in the north Tanggu, Binhai New Area, Tianjin are detaily studied lithologic characteristics of the sedimentary strata, sedimentary ficies and morphology of their spatial distribution. Since the Late-Pleistocene a alternating sequence of marine-continental-marine-continental sedimentary rock has been developed including alluvial, lacustrine and marine sediments. The sedimentary environment evolved as coastal shallow sea-viver mouth bay-lacustrine-coastal plain-alluvial plain, a general transgression-regression process.