中国白垩纪植物群与生物地层学CRETACEOUS FLORAS AND BIOSTRATIGRAPHY OF CHINA
邓胜徽,卢远征,樊茹,李鑫,方琳浩,刘璐
摘要(Abstract)：
早白垩世时中国可划分出北方、南方和藏南3个植物地理区。北方植物地理区可归入瓦赫拉梅耶夫的西伯利亚加拿大植物地理区,发育有热河、阜新和大砬子3个植物群。热河植物群产于辽西义县组和九佛堂组及其他相当地层,时代为早白垩世早期,以苏铁纲和松柏纲占主导地位。阜新植物群赋存于辽西的沙海组和阜新组及相当地层,以真蕨纲、银杏纲和松柏纲共同繁盛,苏铁纲和木贼目较丰富为特点。由早而晚可以进一步划分为Acanthopteris-Ginkgoco riacea组合、Ruffordia goepperti-Dryopterites组合和Ctenis lyrata-Chilinia组合,分别产于辽西的沙海组、阜新组中下部和阜新组上部。大砬子植物群产于吉林延吉盆地的大砬子组和松辽盆地的泉头组,被子植物占优势且掌鳞杉科丰富。南方植物地理区属于瓦赫拉梅耶夫的欧洲中国植物地理区的范畴,苏铁纲、鳞叶或锥叶型松柏和小羽片小而叶膜厚的真蕨类(主要是Cladophlebis)占主导地位,缺少银杏纲、真蕨纲的蚌壳蕨科及单缝孢类型等,为热带、亚热带植物群,可进一步划分为东部、西藏北部和中部3个亚区。其中,东部亚区滨邻古太平洋,以浙江、福建和山东莱阳盆地等的植物为代表,以鳞叶和锥叶型松柏与本内苏铁Ptilophyllum占优势。该亚区植物群可以进一步划分为3或4个植物组合,自早至晚包括Cupressinocladus-Pagiophyllum组合、Cladophlebis-Ptilophyllum组合、Ruffordia-Zamiophyllum组合和Suturovagina-Frenelopsis组合。西藏北部亚区邻近古特提斯洋东北岸,植物群与东部亚区的基本特点一致,但真蕨类更为繁盛,特别是海金沙科Klukia属和里白科的Gleichenites相当丰富,并有海金沙科的Scleropteris属和马通蕨科存在,裸子植物以苏铁纲为主,松柏纲相对较少,可进一步划分为两个组合。中部亚区介于上述两个亚区之间,由于气候干旱,植物群不发育,以甘肃酒泉盆地、民和盆地所产化石为代表,特点是鳞叶、锥叶型松柏类为主,掌鳞杉科较发育,其他类型罕见。藏南植物地理区属于澳大利亚植物地理区的范畴,只发现于喜玛拉雅地区。晚白垩世植物群只发现于东北、华南、西藏等地的少数地点和少数层位,研究程度较低,还不能进一步划分出植物地理区系和组合。以植物化石为主要依据,结合其他生物和非生物证据,建立了中国不同植物地理区白垩纪含植物化石的地层及相关地层的对比关系。
关键词(KeyWords)： 生物地层学;植物群;植物地理区;白垩纪;中国
基金项目(Foundation): 国家基础研究项目(No.2012CB822003);; 国家自然科学基金(No.40372021,49872998)资助研究;国家自然科学基金(No.91114201);; 国家重点基础研究发展计划(2012CB821906)资助出版~~
作者(Author): 邓胜徽,卢远征,樊茹,李鑫,方琳浩,刘璐
DOI: 10.19839/j.cnki.dcxzz.2012.02.008
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