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湖北宜昌志留系纱帽组几丁虫生物地层学

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陈孝红, 张淼, 王传尚, 李志宏. 2018. 湖北宜昌志留系纱帽组几丁虫生物地层学[J]. 中国地质, 45(6): 1259-1270. doi: 10.12029/gc20180615
引用本文: 陈孝红, 张淼, 王传尚, 李志宏. 2018. 湖北宜昌志留系纱帽组几丁虫生物地层学[J]. 中国地质, 45(6): 1259-1270. doi: 10.12029/gc20180615
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CHEN Xiaohong, ZHANG Miao, WANG Chuanshang, LI Zhihong. 2018. Chitinozoan biostratigraphy of the Silurian Shamao Formation in Yichang of Hubei Province[J]. Geology in China, 45(6): 1259-1270. doi: 10.12029/gc20180615
Citation: CHEN Xiaohong, ZHANG Miao, WANG Chuanshang, LI Zhihong. 2018. Chitinozoan biostratigraphy of the Silurian Shamao Formation in Yichang of Hubei Province[J]. Geology in China, 45(6): 1259-1270. doi: 10.12029/gc20180615
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湖北宜昌志留系纱帽组几丁虫生物地层学

  • 中国地质调查局武汉地质调查中心, 湖北 武汉 430223

  • 基金项目:
    国家自然科学基金项目"中扬子地区志留系几丁虫复苏、多样性与环境变化"（44172031）资助
详细信息
    作者简介: 陈孝红, 男, 1964年生, 研究员, 主要从事地层古生物、页岩气调查工作; E-mail:yccxiaohong@163.com

  • 中图分类号: P534.43

Chitinozoan biostratigraphy of the Silurian Shamao Formation in Yichang of Hubei Province

  • Wuhan Center of China Geological Survey, Wuhan 430223 Hubei, China

  • Fund Project: Supported by National Natural Science Foundation of China (No.44172031)
More Information
    Author Bio: CHEN Xiaohong, male, born in 1964, senior researcher, mainly engages in the study of stratigraphic paleontology and shale gas survey; E−mail:yccxiaohong@163.com .

    摘要

  • 调查分析了湖北宜昌龚家冲志留系纱帽组剖面156件样品，在其中95件泥岩、粉砂岩样品中发现大量保存精美的早志留世几丁虫化石。自下而上识别出Conochitina malleus，Plectochitina pseudoaggltinans，Eisenackitina dolioliformis，Eisenackitina causiata等生物带。每一个几丁虫生物带均代表一次几丁虫多样性发展，由新生分子和已知分子所构成的组合特征能很好地与拉脱维亚、爱沙尼亚和沙特阿拉伯等国外同期地层的几丁虫组合进行对比。宜昌地区志留系几丁虫生物带与笔石、牙形石带的关系显示宜昌地区纱帽组的地质延限大致与笔石Stimulograptus sedgwickii带至Oktavites spiralis带相当，特列奇阶底界位于纱帽组第二段底部，与几丁虫Plectochitina pseudoagglutinans生物带的底界位置接近。同期地层，在重庆涪陵焦石坝等地为产大量笔石的富有机质页岩，是页岩气的重要储层，因此，这一研究成果对于深入认识我国南方志留系页岩气储层的分布发育特点具有重要意义。

    One hundred and fifty-six samples from the Silurian Shamao Formation of the Gongjiachong, Yi chang were investigated. Ninety-five samples collected from gray-greenish mudstone and siltstone contain well-preserved and very abundant Early Silurian chitinozoans. Five chitinozoan biozones, which in ascending order are Conochitina malleus, Plectochitina pseudoagglutinanss, Eisenackitina dolioliformis, Eisenachitia causiata and some other biozones, were recognized. Each chitinozoan biozone is diverse and contains new species occurring with well-known species. They can be correlated with chitinozoan biozones established from the contemporary strata of Latvia, Estonia and north Central Saudi Arabia. The correlation between the chitinozoan biozones and the graptolite and conodont biozones indicates that the geological range of the Shamao Formation in the Yichang area can be roughly correlated with the interval ranging from the upper part of Stimulograptus sedgwickii to Oktavites spiralis graptolite biozones. The basal boundary of the Telychian stage is located on the bottom of 2nd member of the Shamao Formation, which is close to the basal boundary of the Plectochitina pseudoagglutinans chitinozoa biozone.At the same time, the stratum in Jiaoshiba, Fuling of Chongqing and other places is organic rich shale that contains large amounts of graptolite, which is an important reservoir of shale gas.

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  • 图 1  三峡地区地质简图（据陈孝红等，2017）

    Figure 1. 

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    图 2  湖北宜昌龚家冲志留系纱帽组下部几丁虫

    Figure 2. 

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    图 3  宜昌龚家冲下志留统纱帽组三段上部至第四段几丁虫（图例见图 2）

    Figure 3. 

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    图 4  湖北宜昌龚家冲下志留统纱帽组几丁虫（标尺刻度为100µm）

    Figure 4. 

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    图 5  湖北宜昌龚家冲下志留统纱帽组几丁虫

    Figure 5. 

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    图 6  宜昌地区志留系纱帽组几丁虫序列及其对比

    Figure 6. 

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收稿日期:  2016-08-29
修回日期:  2018-05-30
刊出日期:  2018-12-25

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