辽西玲珑塔翼龙动物群和浙江翼龙的同位素年代:兼论中国翼龙化石的地层序列和时代框架  

Timing of Linglongta Pterosaur Fauna from Western Liaoning and Zhejiangopterus:A summary of geochronology and stratigraphic sequence of pterosaur fossil-bearing beds in China

作　　者：汪筱林[1] 程心[1,2] 蒋顺兴[1,2] 王强[1] 孟溪[1] 张嘉良[1,2] 李宁[1,2] 

机构地区：[1]中国科学院古脊椎动物与古人类研究所,中国科学院脊椎动物演化与人类起源重点实验室,北京100044 [2]中国科学院大学,北京100049

出　　处：《地学前缘》2014年第2期157-184,共28页Earth Science Frontiers

基　　金：国家杰出青年科学基金项目(40825005);国家重点基础研究发展计划"973"项目(2012CB821900)

摘　　要：目前中国已经有8个省及自治区发现翼龙化石,时代分布从中侏罗世一直延续到晚白垩世。对近年来大量发现翼龙化石的辽宁玲珑塔和产出浙江翼龙的塘上组两个有争议的化石层位进行了U-Pb同位素测年,得到了最新的年龄数据。在玲珑塔地区含化石沉积地层的碎屑锆石获得了最小150 Ma的同位素年龄,可能代表了化石层位的时代下限,表明含化石层的时代为晚侏罗世。同时,也获得了浙江天台盆地富含恐龙蛋化石层下伏的塘上组和临海上盘浙江翼龙化石地点的塘上组(小雄组)凝灰岩的年龄,分别为113 Ma和90Ma,证实了浙江翼龙产于晚白垩世,而浙江地区不同盆地的塘上组应属于不同时期的沉积。在辽西和浙江这两个重要的有争议的翼龙化石地点的同位素最新年龄数据的基础上,对中国发现的翼龙化石的地层序列和时代框架进行了初步的总结,表明早白垩世翼龙占优势地位。Pterosaurs have been found in eight provinces in China, and their geological ages are from the Middle Jurassic to the Late Cretaceous. We have analyzed the U-Pb zircon ages of two pterosaur localities, Linglongta in Liaoning and Tangshang Formation in Zhejiang, whose ages were disputable. The youngest age of detritaI zircons is 150 Ma, which suggested that the age of the Linglongta Pterosaur Fauna was younger than 150 Ma. Two different ages of tufts from Tangshang Formation in different basins in Zhejiang were obtained： one from Tiantai basin, underlying the dinosaur-egg bearing strata, is 113 Ma and one from Shangpan locality of Linhai is 90 Ma; the pterosaurs were found in the latter basin. These results suggested that Zhejiangopterus was in the Late Cretaceous, and the Tangshang Formation in Tiantai and Xiaoxiong basins were deposited in different times. On the basis of these new ages of two localities, we preliminarily summarized the geochronology and stratigraphic sequence of pterosanr fossil-bearing beds in China, and the pterosaurs from the Early Cretaceous were in the main position.

关 键 词：翼龙 玲珑塔翼龙动物群 浙江翼龙 锆石U-Pb年龄 地质时代框架 

分 类 号：P52[天文地球—古生物学与地层学] P539[天文地球—地质学]