2017年04期

吴浩若,许波,杨群.西藏南部早白垩世贝里阿斯期放射虫化石组合[J].微体古生物学报, 2017, 34(04): 343-359.

WU Haoruo,XU Bo,YANG Qun.BERRIASIAN (THE EARLIEST CRETACEOUS) RADIOLARIAN ASSEMBLAGE FROM THE SOUTHERN XIZANG (TIBET),CHINA[J].Acta Micropalaeontologica Sinica, 2017, 34(04): 343-359.

西藏南部早白垩世贝里阿斯期放射虫化石组合
吴浩若 1 许波 2 杨群 3 *
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+ 作者地址

1中国科学院地质与地球物理研究所, 北京 100029

2中国科学院南京地质古生物研究所资源地层学与古地理学重点实验室, 南京 210008

3现代古生物学与地层学国家重点实验室, 南京 210008

白垩纪放射虫硅质岩广泛分布于藏南雅鲁藏布蛇绿岩带两侧,形成于多种沉积-构造背景,为藏南特提斯演化研究提供了丰富信息。为确定硅质岩的时代,需要建立藏南白垩纪放射虫分带系统。作为第一步,本文重新研究了江孜地区宗卓组含白垩纪早期放射虫(吴浩若和李红生,1982)的滑塌岩块标本(80-R1),描述了放射虫化石29种,包括6个新种。有13种见于阿曼同期的放射虫动物群(Dumitrica et al.,1997),其中 Loopus yangiStichocapsa labyrinthica 限于白垩纪初贝里阿斯期。藏南和阿曼的动物群中都富含 GodiaWu 和 Becus Wu 两属,前者始现于贝里阿斯期(O'Dogherty et al.,2009)。此外, Obesacapsula polyedra 是加利福尼亚贝里阿斯期放射虫动物群的重要分子。宗卓组化石组合与藏南下鲁硅岩的 Pseudodictyomitra carpatica 带(KR1)(Matsuoka et al.,2002)比较,仅有很少共同分子。下鲁硅岩中该带的时代被归于提塘期-瓦兰今期。然而,其所含 Eucyrtidiellum pyramis以及与含 Loopus primitivus的西太平洋 P. carpatica带底部化石群的密切关系,指示其时代可能限于晚侏罗世提塘期。
语种: 中文   
基金: 本研究得到科技部基础性工作专项(2013FY113000)和国家自然科学基金青年基金(41402016)部分资助。
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