摘要： 通过对杭州湾第四系钻孔的年代地层学、沉积学、古环境学等多学科综合分析,认为 XZK169 孔全新世沉积始于孔深17.35m处(年代约为 10 ~ 9 ka B P), 其下至孔深 86.40 m沉积属晚更新世。整个沉积层中可分出3个海进—海退旋回: 晚更新世早期以陆相沉积为主,出现河湖相—滨海湖泊相—河湖相沉积,气候为温凉干燥—温暖湿润—温凉干燥; 晚更新世中晚期出现河湖相—潮滩 湖相—浅海相—河口湾相沉积,气候为温凉干燥—寒冷干燥—温凉—暖热湿润—温热湿润: 经历了末次冰期侵蚀后,全新世出现浅海相—河口湾相沉积,气候以暖热湿润—温暖湿润为主。约在5 ka B P,杭州湾与长江口分离。
关键词:
杭州湾,
晚第四纪,
年代地层,
沉积相,
古环境演变
Abstract: Through the comprehensive analyses on chronostratigraphy, sedimentology, and paleoenvironmentology of the Quaternary bore (XZK169) in Hangzhou Bay, it is proposed that the Holocene sedimentation began from the depth of 17.35 m (about 10-9 ka B P) , and the strata below this level to the depth of 86.4 m belong to the Late Pleistocene In the profile, three cycles of transgression regression can be recognized In the early period of Late Pleistocene, mainly continental sediments were developed, river-lacustrine facies, lagoon-lacustrine facies, river lacustrine facies respectively appeared, and the paleoclimate changed from temperament cool arid, warm and moist, to temperament cool arid In the mid ate period of Late Pleistocene, river lacustrine facies, tidal flat and lagoon facies, shallow marine facies, estuary facies appeared and the paleoclimate changed from temperament cool arid, cold and arid, temperament cool, warm hot and moist, to warm and moist After the erosion during the last glaciation, shallow marine estuary facies appeared in the Holocene, and the paleoclimate changed from warm hot and moist, to warm and moist. The Hangzhou Bay separated from the Changjiang River mouth in around 5 ka B P.
Key words:
Hangzhou Bay,
Late Quaternary,
chronostratigraphy,
sedimentary facies,
paleoenvironmental evolution
中图分类号:
王建华, 周洋, 郑卓, 丘元僖, 张珂, 邓韫, 梁致荣, 杨小强. 杭州湾晚第四纪沉积与古环境演变[J]. 古地理学报, 2006, 8(4): 551-558.
Wang Jianhua, Zhou Yang, Zheng Zhuo, Qiu Yuanxi, Zhang Ke, Deng Yun, Liang Zhirong, Yang Xiaogiang. Late Quaternary sediments and paleoenvironmental evolution in Hangzhou Bay[J]. JOPC, 2006, 8(4): 551-558.