Primary Establishment of Quaternary Stalagmite Section in the Shihua Cave, Beijing
详细信息
- 责任者：Lü Jinbo (Beijing Geological Survey ; Beijing 102206 ; China) ; Li Tieying
- 刊名：Geological Survey and Research
- 出版年：2013
- 卷期：36(1)
- 页码：p.63-70
- issnNo：ISSN1672-4135
- isbnNo：CN12-1353/P
摘要
Beijing Shihua Cave sits at the northeastern of granite fringe synclial belt in Fangshan,and is face to face with Peking Man(Homo erectus pekinensis)Site.Their layer is limestone in Ordovician Period.Among Chinese Karst caves,Beijing Shihua Cave has got the most complete sorts of speleothems.There is the superimposed relationship of stalagmite from drip water is evident and the microbanding of stalagmite grows clear in Holocene.The speleothems recorded the changing information of Beijing Western Hills antique environment since Middle Pleistocene,which could set up Quaternary section of stalagmite.The U dating of calcareous plate is 334.99 ～ 366.74 ka,,named Gaiban Fm.The U dating of wide stalagmite is 169 ～ 235 ka,and the ESR dating of wide stalagmite is 130 ～ 518 ka,all of which were deposited in Middle Pleistocene,named Yunshuidong Fm.The U dating of rod-like stalagmite is 14.9±2.1 ～ 100.3±11.1 ka,which was deposited in Upper Pleistocene,named Shihuadong Fm.In Holocene stalagmite,usually there is an about 1μm-thick dark stripe deposited between two microbandings,which in fact is the boundary of two microbandings.It is a mark of microbanding quantities.14C dating of microbanding stalagmite is 0.58 ～ 2.50 ka,named Shoubeizhidong Fm.