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延庆千家店地区硅化木赋存层位及形成时代分析
引用本文:焦润成,王荣荣,张淑云.延庆千家店地区硅化木赋存层位及形成时代分析[J].城市地质,2016(2):56-59.
作者姓名:焦润成  王荣荣  张淑云
作者单位:1. 北京市地质研究所,北京,100011;2. 中国地质大学,北京,100083
基金项目:北京市国土局项目(编号0747-1361SITCN217),中国地质调查局项目(编号1212011220044)
摘    要:北京延庆千家店土城子组中的硅化木自发现以来,得到了众多学者的关注,但关于硅化木的赋存层位和形成时代一直未有定论,目前主流观点认为硅化木广泛发育于土城子组一段和二段的下部,关于其形成时代则自侏罗纪早期至白垩纪早期的论述均有,这种争论显然不利于木化石的保护、科普和进一步深化认识。在千家店土城子组进行的考察结果展现出与前人观点不同的线索。实地考察、剖面测量和年龄测试结果显示:原位埋藏硅化木形成时代应为晚侏罗世早期,赋存层位为土城子组一段下部,而土城子组二段下部的沉积特征反应出当时水位频繁升降,水体能量剧烈变化,火山活动暂时陷入沉寂的沉积环境,较难满足形成木化石的基本要求。

关 键 词:千家店  硅化木  土城子组  晚侏罗世早期

Occurrence Strata and Formation Age of Petriifed Wood in Qianjiadian Area of Yanqing County
JIAO Runcheng,WANG Rongrong,ZHANG Shuyun.Occurrence Strata and Formation Age of Petriifed Wood in Qianjiadian Area of Yanqing County[J].City Geology,2016(2):56-59.
Authors:JIAO Runcheng  WANG Rongrong  ZHANG Shuyun
Abstract:The petrified wood of Tuchengzi Formation in Qianjiadian area of Yanqing County, has attracted received many scholars’ attention since it was discovered. However, its hosting strata and formation age are uncertain. At present, the main view is that the petriifed wood is widely developed in lower part of the ifrst and second unit of Tuchengzi Formation. However, its formation age is discussed from the Early Jurassic to the Early Cretaceous. These arguments are clearly not conducive for the wood fossil protection and further study. Proifle measurement and ifeldworks show that the petriifed wood likely formed in the early stage of Late Jurassic, and it developed likely in lower part of the ifrst unit of Tuchengzi Formation. The sedimentary characteristics of lower part of the second unit of Tuchengzi Formation reflect an inapposite environment, which presented as frequent water lift, dramatic changes in the energy of water, a temporary silence of volcanic activity. The environment is dififcult to meet the basic requirements of the formation of wood fossil.
Keywords:Qianjiadian area  Petriifed wood  Tuchengzi Formation  the early stage of Late Jurassic
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