黑龙江七台河下白垩统苔类化石Marchantiolites blairmorensis发现及其地质意义  

Discovery of fossil Marchantiolites blairmorensis(liverwort) from the lower cretaceous of Qitaihe area,Heilongjiang province,northeast China and its geological significance

作　　者：林志成[1] 闫德飞[1] 孙柏年[1] 李相传[1] 吕晓东[1] 何文龙[1] 杜宝霞[1] 温雯雯[1] 

机构地区：[1]兰州大学资源环境学院,兰州730000

出　　处：《兰州大学学报（自然科学版）》2010年第4期1-6,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点基础研究发展计划(973计划)项目(2006CB701401);国家自然科学基金项目(40772012);兰州大学中央高校基本科研业务费专项资金项目(lzujbky2009-69);2007年国家建设高水平大学公派研究生项目

摘　　要：近来于黑龙江七台河勃利盆地城子河组中发现了一种大型叶状体苔类化石.借鉴蕨类化石羽状复叶结构的描述方法,提出了一套新的术语并用来准确描述这种苔类化石.在体式显微镜和扫描电镜下详细研究了这种二歧式分叉的大型叶状体苔类的宏观和微观特征,并与同时代或同分布区的其他苔类化石分析对比后,确定为古似地钱属的Marchantiolites blairmorensis.这种苔类化石在黑龙江的首次发现表明早白垩世M.blairmorensis在中国的分布区已北延至黑龙江东部,亦佐证了城子河组的地质时代为早白垩世,并推论勃利盆地当时的古生态环境为溪流发育、植被繁盛的湖泊沼泽环境.Recently, a kind of mega thallus fossil was found from the lower cretaceous Chengzihe formation of Jixi group in the Boll basin of Qitaihe city, Heilongjiang province. By using the approach and terminology describing the pinnately compound leaf of fossil ferns, a new set ofterminology was established to accurately describe the dichotomous mega thalloid liverwort in detail. The fossils were observed with a stereo microscope and a scanning electron microscope, and compared with some other fossil liverworts from the same area or the same geologic age. Accordingly, the fossil liverwort was assigned to Marchantiolites blairmorensis. This kind of liverwort, found for the first time in Heilongjiang province, indicates that the distribution of M. blairmorensis in the early cretaceous has been northwardly extended to the east of Heilongjiang province. The appearance of M. blairmorensis provides a new proof for the age of the Chengzihe formation, which was early cretaceous, and also illustrates that the palaeoenvironment in this area was of lakes and swamps with developed stream and exuberant vegetation.

关 键 词：Marchantiolites blairmorensis 苔类化石 城子河组 下白垩统 黑龙江省 

分 类 号：Q914[天文地球—古生物学与地层学]