| 辽宁北部地区下白垩统木化石及其古气候意义 |
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| 引用本文： | 丁秋红,李晓海,李文博,张志斌,陈树旺,张健,孙守亮,张渝金.辽宁北部地区下白垩统木化石及其古气候意义[J].地质与资源,2022,31(1):13-20,12. |
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| 作者姓名： | 丁秋红 李晓海 李文博 张志斌 陈树旺 张健 孙守亮 张渝金 |
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| 作者单位： | 中国地质调查局 沈阳地质调查中心, 辽宁 沈阳 110034 |
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| 基金项目： | 中国地质调查局项目;大兴安岭中南部中侏罗世植物群及地层新探;国家自然科学基金 |
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| 摘 要： | 对辽宁北部地区下白垩统沙海组木化石进行的木材解剖学及系统分类学研究显示,木化石均为硅化保存的松柏类裸子植物次生木质部,分别属于Protocupressinoxylon、Protopiceoxylon和Xenoxylon等3个分类群.当前木化石新材料生长轮清晰,早晚材比率在0.84～64之间,年平均敏感度在0.23～0....
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| 关 键 词： | 木化石 古气候 下白垩统 沙海组 生长轮 辽宁北部 |
| 收稿时间： | 2021-02-02 |
THE LOWER CRETACEOUS PETRIFIED WOOD IN NORTHERN LIAONING:Paleoclimatic Significance |
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| DING Qiu-hong,LI Xiao-hai,LI Wen-bo,ZHANG Zhi-bin,CHEN Shu-wang,ZHANG Jian,SUN Shou-liang,ZHANG Yu-jin.THE LOWER CRETACEOUS PETRIFIED WOOD IN NORTHERN LIAONING:Paleoclimatic Significance[J].Geology and Resources,2022,31(1):13-20,12. |
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| Authors: | DING Qiu-hong LI Xiao-hai LI Wen-bo ZHANG Zhi-bin CHEN Shu-wang ZHANG Jian SUN Shou-liang ZHANG Yu-jin |
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| Institution: | Shenyang Center of China Geological Survey, Shenyang 110034, China |
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| Abstract: | The wood anatomy and systematics study of petrified woods from the Lower Cretaceous Shahai Formation in northern Liaoning show that the petrified woods are all silicified secondary xylem of conifer gymnosperms,belonging to the taxonomic groups of Protocupressinoxylon,Protopiceoxylon and Xenoxylon respectively.The growth rings of novel materials of the current petrified woods are clear,with the early wood to late wood ratio of 0.84-64,and the annual average sensitivity of 0.23-0.3,indicating that the climate has obvious seasonal variation.The trees have a short late-wood growth time and long early-wood time span,that is,the tracheid division is strong in the growing season,and the suitable time for factors such as moisture,temperature,humidity and light last longer.The uneven width of continuous growth rings and existence of false rings reflect that the climate changed frequently at that time,and the average annual precipitation may have a great difference.It can be inferred from the growth characteristics that the Shahai Formation in northern Liaoning was generally humid during the sedimentary period,but there might be some arid-semiarid climate fluctuations.The special anatomical structures in petrified woods such as false ring,traumatic resin canal,twisted growth ring and insect hole reveal that there may be drought,wind disaster and insect pests in the then eco-environment,which are unfavorable for the growth of trees in a short time. |
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| Keywords: | petrified wood paleoclimate Lower Cretaceous Shahai Formation growth ring northern Liaoning |
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