吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (2): 499-517.doi: 10.13278/j.cnki.jjuese.201602116
陈永胜1,2, 李建芬1,2, 王福1,2, 田立柱1,2, 商志文1,2, 施佩歆1,2, 姜兴钰1,2, 王宏1,2
Chen Yongsheng1,2, Li Jianfen1,2, Wang Fu1,2, Tian Lizhu1,2, Shang Zhiwen1,2, Shi Peixin1,2, Jiang Xingyu1,2, Wang Hong1,2
摘要:
以渤海湾西岸现代岸线附近的NP3、CH110和BT113三个钻孔全新世岩心为研究对象,采用沉积岩石学、AMS 14C(accelerator mass spectrometry 14C,加速器质谱14C)测年、微体生物聚类分析等方法精细判别沉积相,重建渤海湾西岸全新世沉积演化历史,并利用微体生物组合分带对水深变化的指示,定量讨论全新世相对海面变化。结果表明:渤海湾西岸全新世受海陆交互作用影响,经历了沼泽-潮滩-浅海-前三角洲-三角洲前缘-三角洲平原环境的演化过程。全新世初始阶段,研究区中部和北部发育沼泽环境,南部未见沉积,与上更新统河流相沉积呈不整合接触。全新世早期,研究区潮滩环境发育。潮滩层厚度约1 m,历时数百至1千余年。至7000 cal BP前后水深增大,研究区进入浅海环境。约6000 cal BP,沿岸南北两端先后进入三角洲过渡环境,中部三角洲环境约开始于1500 cal BP。渤海湾西岸地区全新世的环境演化同时记录了该地区的相对海面变化:约10000 cal BP前后,渤海湾相对海平面已接近21.3~20.4 m。约8000 cal BP,相对海平面介于18.6~17.0 m。约6000 cal BP时相对海平面低于6.8 m,5000~1000 cal BP,相对海平面高于-2.5 m,1000~800 cal BP,相对海平面介于-1.3~-0.4 m。8000~5000 cal BP时,相对海面上升约15.0 m,上升速率达5 m/1 ka。
中图分类号:
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