辽西义县下白垩统九佛堂组木化石的发现  

Discovery of petrified wood from Lower Cretaceous Jiufotang Formation in Yixian of western Liaoning,NE China and its significance

作　　者：王秀芹[1] 田宁[2,3,4] 王永栋[5,6] 朱志鹏[2] 李玉玲[2] 

机构地区：[1]朝阳师范高等专科学校生化工程系,辽宁朝阳122000 [2]沈阳师范大学古生物学院,沈阳110034 [3]现代古生物学与地层学国家重点实验室,南京210008 [4]国土资源部东北亚古生物演化重点实验室,沈阳110034 [5]中国科学院南京地质古生物研究所,南京210008 [6]中国科学院资源地层学与古地理学重点实验室,南京210008

出　　处：《世界地质》2015年第4期879-885,共7页World Geology

基　　金：国家重点基础研究发展计划(2012CB822003);国家自然科学基金项目(41272010;41302004;40972008);中国科学院科技交叉与合作创新团队项目;现代古生物学和地层学国家重点实验室开放基金项目(133113);辽宁省教育厅科学研究一般项目(L2012391);沈阳师范大学优秀人才支持计划(91400114006)联合资助

摘　　要：首次发现产自辽西义县皮家沟下白垩统九佛堂组保存有解剖构造的木化石,利用木化石切片法对木化石解剖特征进行研究。当前木化石均为硅化保存,其中一块标本保存有髓、初生木质部、次生木质部等解剖构造。其髓部主要由薄壁细胞构成,初生木质部为内始式,次生木质部为Protophyllocladoxylon型。部分木化石标本表面密布大小不一的孔洞,推测为昆虫幼虫的觅食痕迹。此外,木化石产出层位还发现有大量丝碳化石,表明义县地区早白垩世九佛堂组沉积时期存在野火事件,而频发的火山喷发活动可能是野火事件的诱因。New fossil wood material was reported for the first time from the Lower Cretaceous Jiufotang Formation in Yixian of western Liaoning,NE China. These fossil woods are silicified preserved,in which one specimen is anatomically preserved with pith,primary xylem and secondary xylem. The pith is mainly composed of parenchymatous cells. The primary xylem is with an endarch maturation. Anatomical details of the secondary xylem canbe taxonomically referred to the morphogenus Protophyllocladoxylon Krausel. Additionally,numerous small holes occurred on the surface of some fossil wood specimens,which is guessed the foraging marks of insect larvae. It is noted that numerous fossil charcoals were found associated with these fossil woods. The presence of fossil charcoal indicates that natural wild fires,most probably ignited by volcanic eruptions,may have occurred in the Yixian region during the sedimentary stage of the Jiufotang Formation in the Early Cretaceous.

关 键 词：木化石 丝碳化石 Protophyllocladoxylon 早白垩世 九佛堂组 义县 

分 类 号：Q914.2[天文地球—古生物学与地层学]