云南楚雄盆地东南缘安龙堡下侏罗统含恐龙化石地层的时代厘定REVISION OF THE LOWER JURASSIC DINOSAUR-BEARING HORIZONS IN ANLONGBAO OF SOUTHEASTERN CHUXIONG BASIN, YUNNAN PROVINCE, CHINA
王国付,潘世刚,李俊,任鑫鑫,尤海鲁
摘要(Abstract)：
云南楚雄盆地东南部侏罗纪地层中富含以基干蜥脚型类为代表的恐龙化石。基干蜥脚型类在全球范围内尚未在中侏罗世地层中被发现,而1∶20万地质图中该区域含上述化石的层位被划入中侏罗统。笔者在安龙堡一带恐龙化石调查中,发现之前对该区域下侏罗统冯家河组划分有误。我们对冯家河组进行了重新厘定,并确定了该区域恐龙化石所在层位。厘定后该区域冯家河组为上三叠统舍资组和中侏罗统张河组之间的一套紫红色粉砂质泥岩,以及泥岩与紫红色-灰黄色粉砂岩、泥质粉砂岩韵律互层,中部和顶部富含恐龙化石,时代为早侏罗世。通过岩石地层学与生物地层学研究,该区域下侏罗统冯家河组与上下地层间未发现明显的沉积间断,笔者推测其为连续沉积。连续沉积的下侏罗统在滇中十分罕见,尤其是该区域下侏罗统中部和顶部富含大量恐龙化石,为研究恐龙早期演化提供了重要的地质时代依据。
关键词(KeyWords)： 恐龙;岩石地层;生物地层;冯家河组;下侏罗统;楚雄盆地;云南
基金项目(Foundation): 中国科学院战略性先导科技专项(B类)(XDB26000000);; 国家自然科学基金项目(41688103,41872021);; 楚雄州古生物化石研究中心研究经费共同资助
作者(Author): 王国付,潘世刚,李俊,任鑫鑫,尤海鲁
DOI: 10.19839/j.cnki.dcxzz.2019.04.010
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