摘要
青岛市全新世陆相地层共分4层,从底到顶被前人分别命名为第⑨,⑦,⑤和③层,以粉土、粉质粘土和砂为主要沉积物。近来笔者在该市国际会议展览中心二期工程工地施工期间,从出露的全新世陆相地层的第⑤和③层的粉土及粘土中发现一个特异埋藏的大植物化石群。两层中均筛出大量保存三维立体结构的果实和种子标本。第⑤层顶部还产出枝叶、木材化石。产地附近的新钻孔材料同位素测年值显示,第⑦层底部、第⑤层顶部及第③层顶部14C测定年龄分别为6264±80aB.P.,4805±150aB.P.和3550±115aB.P.。对青岛市国际会议展览中心二期工程工地剖面植物群的初步研究结果表明,第⑤层顶部产出的枝叶、木材化石类群较单一,大多数属于壳斗科落叶类群,但从第⑤和③两层筛出的近万枚果实和种子标本却显示了丰富的类群多样性及良好的分层性,目前已鉴定的标本隶属于24科、38属、62种(包括未定种),全部为被子植物。该分层保存的特异埋藏的大植物化石群的发现,为探讨青岛地区全新世植被演替过程、气候变化及其与人类社会发展的关系提供了丰富的材料。
The terrestrial Holocene sequence of the Qingdao city was divided into 4 layers, i. e.,layers （9）,（7）,（5）, and （3） from the bottom upwards by previous researches. The deposition is mainly composed of silty soil, silty clay, and sands. Recently an exquisitely preserved megafossil flora, a lagerstatten, comprising a large number of fruits and seeds,leafy branches,leaves,stems,and pieces of wood was discovered from the Holocene terrestrial stratum at the construction site of the Qingdao International Convention Center which with layers （5） and （3） preserved. Fruits and seeds are sieved from silty soil and silty clay of both Layer （5） and Layer （3）,while the top of Layer （5）,a thin bed of silty clay also yields leafy branches,leaves, stems,and pieces of wood. Three 14C dating analyses on material from the bottom of Layer （7）,the top of Layer （5）,and the top of Layer （3） from a drilling core close to the fossil site show ages of 6264± 80aB. P., 4805 ±150aB. P., and 3550 ± 115aB. P. respectively. While fossils of leafy branches, leaves,stems, and pieces of wood are found mainly belonging to deciduous Fagaceae L., about ten thousands specimens of 3-dimensionally preserved fruits and seeds obtained from layers （5） and （3） at the fossil site have shown their high diversity as well as different components in different layers. They are primarily assigned to 38 genera and 62 species,belonging to 24 angiospermous families. The discovery of this plant fossil lagerstatten with sequenced layers deposited during thousands of years in Holocene provides an opportunity to understand the evolutionary history of vegetation in Holocene in Qingdao area along with the climate change and human activity.
出处
《第四纪研究》
CAS
CSCD
北大核心
2008年第4期762-768,共7页
Quaternary Sciences
基金
中国科学院知识创新工程重要方向项目(批准号:KZCX2-YW-105)
中国科学院/国家外国专家局创新团队国际合作伙伴计划
国家重点基础研究发展规划项目(批准号:2006CB806400)
国家自然科学基金项目(批准号:J0530085)资助
