辽宁铁法盆地早白垩世Elatocladus manchurica(Yokoyama)Yabe及其对古环境的指示  

STUDIES OF EARLY CRETACEOUS ELATOCLADUS MANCHURICA (YOKOYAMA) YABE FROM THE TIEFA BASIN, LIAONING PROVINCE AND ITS PALAEOENVIRONMENTAL IMPLICATIONS

作　　者：杜宝霞[1,2] 闫徳飞 孙柏年[1] 邓胜徽[3] 解三平[1] 温雯雯[1] 

机构地区：[1]兰州大学地质科学与矿产资源学院,兰州730000 [2]现代古生物学和地层学国家重点实验室 中国科学院南京地质古生物研究所,南京210008 [3]中国石油勘探开发研究院,北京100083

出　　处：《古生物学报》2012年第2期209-221,共13页Acta Palaeontologica Sinica

基　　金：国家重点基础研究发展计划"973"项目(No.2012CB822000);国家自然科学基金(No.41172022);现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所)开放基金(No.093110)资助

摘　　要：分析产于辽宁铁法盆地下白垩统小明安碑组Elatocladus manchurica(Yokoyama)Yabe的叶形态结构及表皮构造特征,通过对中国的Elatocladus Halle属内化石记录以及其宏观枝叶形态及表皮特征进行对比,认为将Elatocladus manchurica归属于Cupressaceae sensu lato较为合理。同时将Elatocladus manchurica与其最近现存对应种Cunninghamia lanceolata(Lamb.)Hook进行表皮构造及叶结构特征的对比分析。在此基础上利用气孔比率法半定量地重建早白垩世辽宁铁法盆地的大气CO2浓度为1026 ppmv,并讨论当前结果与相关碳循环模型推测值之间的差异,认为本文化石可用来进行古大气CO2浓度的重建。The leaf morphological characters and epidermal structure of Elatocladus manchurica （Yokoyama） Yabe from the Lower Cretaceous Xiaoming＇- anbei Formation, Tiefa Basin of Liaoning Province are analyzed. It is appropriate to assign E. manchurica to Cupressaceae sensu lato according to the comparison of leaf morphology and cuticular characteristics amongst all the fossil species of Elatocladus in China. A comparative analysis on the leaf characters and epidermal structures between fossil E. manchurica and its nearest living equivalent species, Cunninghamia lanceolata （ Lamb. ） Hook, is also documented. The Early Cretaceous atmospheric CO2 concentration was 1 026 ppmv in the Tiefa Basin as semi-quantitatively reconstru- cted using stomatal ratios of extant and fossil plants. Differences between our results and conjectural values from the carbon cycle model are discussed, and indicate that the stomatal parameters of the present species can be used to reconstruct the palaeo-atmospheric CO2 concentration.

关 键 词：Elatocladus manchurica CO2浓度 古环境 早白垩世 铁法盆地 

分 类 号：Q914[天文地球—古生物学与地层学]