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    扬子台地西北缘志留纪奥氏笔石属新种及地层对比意义

    王欣 王健 张举

    王欣, 王健, 张举, 2018. 扬子台地西北缘志留纪奥氏笔石属新种及地层对比意义. 地球科学, 43(12): 4399-4410. doi: 10.3799/dqkx.2018.521
    引用本文: 王欣, 王健, 张举, 2018. 扬子台地西北缘志留纪奥氏笔石属新种及地层对比意义. 地球科学, 43(12): 4399-4410. doi: 10.3799/dqkx.2018.521
    Wang Xin, Wang Jian, Zhang Ju, 2018. A New Silurian Graptolite Species of Oktavites from Northwestern Margin of Yangtze Platform, and Its Stratigraphic Significance. Earth Science, 43(12): 4399-4410. doi: 10.3799/dqkx.2018.521
    Citation: Wang Xin, Wang Jian, Zhang Ju, 2018. A New Silurian Graptolite Species of Oktavites from Northwestern Margin of Yangtze Platform, and Its Stratigraphic Significance. Earth Science, 43(12): 4399-4410. doi: 10.3799/dqkx.2018.521

    扬子台地西北缘志留纪奥氏笔石属新种及地层对比意义

    doi: 10.3799/dqkx.2018.521
    基金项目: 

    中国地质调查局项目 121201011000150006

    国家自然科学基金青年基金项目 41302006

    详细信息
      作者简介:

      王欣(1984-), 男, 在读博士生, 助理研究员, 主要从事古生物学与地层学相关专业研究

    • 中图分类号: P52

    A New Silurian Graptolite Species of Oktavites from Northwestern Margin of Yangtze Platform, and Its Stratigraphic Significance

    • 摘要: Oktavites spiralis(Geinitz,1842)是志留系兰多维列统特列奇阶的笔石带化石分子,其独特的盘旋生长模式易于识别,在世界范围内广泛分布,地层意义重要.然而,关于Oktavites spiralis的首现位置始终存在争议,不利于地层的精确对比.在陕西紫阳、岚皋地区,Oktavites spiralis笔石带可以通过带化石丰度变化进行识别,而不是依靠带化石的首现.近来,对陕西紫阳、岚皋地区多个志留系特列奇阶剖面研究后认为,通过幼体特征和盘旋形态对比,一个奥氏笔石新种Oktavites longtanensis sp.nov.可以从Oktavites spiralisOktavites contortus中进一步区分出来.新种Oktavites longtanensis sp.nov.化石延限仅限于Oktavites spiralis笔石带,延限较短,并具有重要的演化意义和较强的地层划分对比潜力.

       

    • 图  1  研究区域的地质简图及剖面位置

      Fig.  1.  Geological map showing the locations of the studied sections

      图  3  新种Oktavites longtanensis sp. nov.的不同发育阶段

      a.Gr20303,50.50 m; b.Gr23621,70.00 m; c.Gr21444,50.50 m; d.Gr20304,50.50 m;e.Gr20305,50.50 m;f.Gr20300,44.60 m;标本均采自龙潭剖面O. spiralis笔石带

      Fig.  3.  Oktavites longtanensis sp.nov. in different developmental stages

      图  4  新种Oktavites longtanensis sp. nov.的不同发育阶段

      a.Gr20303,50.50 m;b.Gr23621,70.00 m; c.Gr21444,50.50 m; d.Gr20304,50.50 m; e.Gr20300,44.60 m;以上标本均采自龙潭剖面O. spiralis笔石带

      Fig.  4.  Oktavites longtanensis sp. nov. in different developmental stages

      图  5  陕西紫阳-岚皋地区Oktavites spiralisOktavites longtanensis sp. nov.和Oktavites contortus之间的比较

      a.Oktavites contortus(Perner,1897),龙潭剖面,38.10 m,O. spiralis笔石带,Gr21454;b.Oktavites spiralis(Geinitz,1842),龙潭剖面,64.15 m,O. spiralis笔石带,Gr21424; c.Oktavites longtanensis sp. nov.,龙潭剖面,44.60 m,O. spiralis笔石带,Gr20300; d.Oktavites contortus(Perner,1897),桥西剖面,2.10 m,Cyr. lapworthi笔石带,Gr21700;e.Oktavites spiralis(Geinitz,1842),龙潭剖面,65.00 m,O. spiralis笔石带,Gr21420; f.Oktavites longtanensis sp. nov.,龙潭剖面,50.50 m,O. spiralis笔石带,Gr20303

      Fig.  5.  Comparison among Oktavites spiralis, Oktavites longtanensis sp. nov. and Oktavites contortus in the Ziyang-Langao area

      图  6  Cyrtograptus lapworthi弓笔石的起源过程推测

      a.Oktavites contortus(Perner,1897),龙潭剖面,38.10 m,O. spiralis笔石带,Gr21259; b.Oktavites longtanensis sp. nov.,龙潭剖面,50.5 m,O. spiralis笔石带,Gr20304; c.Oktavites excentritus(Bjerreskov,1975),龙潭剖面,63.5 m,O. spiralis笔石带,Gr21303;d.Cyrtograptus lapworthi(Tullberg,1883),芭蕉口剖面,546.0 m,Cyr. lapworthi笔石带,Gr20166

      Fig.  6.  Potential origin process of Cyrtograptus lapworthi

      图  7  Oktavites spiralisOktavites contortus的不同发育阶段

      a~d,i.Oktavites spiralis(Geinitz,1842);a.龙潭剖面,70.00 m,O. spiralis笔石带,Gr21414; b.龙潭剖面,42.60 m,O. spiralis笔石带,Gr23583; c.芭蕉口剖面,545.10 m,O. spiralis笔石带,Gr20751; d.龙潭剖面,44.00 m,O. spiralis笔石带,Gr21278; i.龙潭剖面,64.15 m,O. spiralis笔石带,Gr21424;e~h.Oktavites contortus(Perner,1897);e.芭蕉口剖面,546.00 m,Cyr. lapworthi笔石带,Gr23404; f.桥西剖面,2.10 m,Cyr. lapworthi笔石带,Gr20405;g.龙潭剖面,53.50 m,O. spiralis笔石带,Gr23630; h.龙潭剖面,38.10 m,O. spiralis笔石带,Gr21454

      Fig.  7.  Oktavites spiralis and Oktavites contortus in different developmental stages

      图  2  综合剖面柱状图

      Fig.  2.  Comprehensive profile histogram of the studied sections in the Ziyang area

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