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

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

王欣^1,2,3,,
王健^1,2,3,
张举^1,2,3

1.
中国地质调查局西安地质调查中心, 陕西西安 710054
2.
中国地质调查局造山带地质研究中心, 陕西西安 710054
3.
自然资源部岩浆作用成矿与找矿重点实验室, 陕西西安 710054

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
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出版历程
- 收稿日期: 2018-01-08
- 刊出日期: 2018-12-15

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

Wang Xin^{1,2,3
,},
Wang Jian^1,2,3,
Zhang Ju^1,2,3

1.
Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China
2.
Orogen Research Center, China Geological Survey, Xi'an 710054, China
3.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Natural Resources, Xi'an 710054, China

摘要

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 spiralis和Oktavites 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.
- 志留系 /
- 特列奇阶 /
- Oktavites spiralis /
- Oktavites longtanensis sp.nov. /
- 弓笔石 /
- 古生物学 /
- 地层学
Abstract: Oktavites spiralis (Geinitz, 1842) is an index graptolite species of the Telychian age (late Llandovery, Silurian) that combined marked spiral morphology as well as a global distribution, making it stratigraphically significant. However, the first appearance datum of Oktavites spiralis is controversial, and consequently it is much difficult for regional stratigraphic correlations. In the Ziyang-Langao area of Shaanxi Province, Oktavites spiralis graptolite zone belongs to an abundance zone, rather than the FAD (first appearance datum) of this index fossil. Recent investigations in multiple Telychian profiles in the Ziyang-Langao area, along the northern margin of South China, reveal that a new species Oktavites longtanensis sp. nov. can be further distinguished from typical form of Oktavites spiralis and Oktavites contortus according to the larvas and coiled model. The new species Oktavites longtanensis sp. nov. is of a shorter stratigraphic range with great evolutionary significance, therefore has a great potential for accurate correlation of Oktavites spiralis Zone.
- Silurian /
- Telychian stage /
- Oktavites spiralis /
- Oktavites longtanensis sp.nov. /
- Cyrtograptus /
- paleontology /
- stratigraphy

HTML全文

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

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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

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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

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图 5 陕西紫阳-岚皋地区Oktavites spiralis，Oktavites 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

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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

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图 7 Oktavites spiralis和Oktavites 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

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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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