| 鄂西秭归盆地下侏罗统香溪组新层型剖面研究 |
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| 引用本文： | 陈辉明,孟繁松,张振来.鄂西秭归盆地下侏罗统香溪组新层型剖面研究[J].地层学杂志,2002,26(3):187-192,234. |
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| 作者姓名： | 陈辉明 孟繁松 张振来 |
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| 作者单位： | 中国地质调查局地层古生物研究中心,湖北宜昌,443003 |
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| 基金项目： | 中国地质调查局“中国古大陆环境变化及年代、生物、层序、事件、化学和构造地层响应”项目 (编号 :2 0 0 113 90 0 72 )成果之一 |
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| 摘 要： | 秭归盆地香溪组是著名的华南下侏罗统典型岩石地层单位之一 ,但随着三峡大坝的建成及库区水位的提高 ,其层型地点和选型剖面都将被淹没 ,因而推荐位于库区警戒水位之上的泄滩罗家沟剖面为香溪组替代新层型剖面。通过对该剖面的详细研究 ,提出下侏罗统香溪组的底界应划在厚 1.5— 2 0 m的砾岩或灰白色石英砂岩之底 ,与上三叠统和下侏罗统的界线基本一致 ,并证实秭归盆地两统之间既存在假整合接触 ,也有连续沉积现象。罗家沟剖面的植物化石可分为下部 Coniopteris- Czekanowskia组合和上部 Coniopteris- Ptilophyllum组合 ;从沉积环境分析 ,香溪组具有明显的韵律性 ,可识别出 4个沉积旋回。
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| 关 键 词： | 早侏罗世 新型剖面 植物组合 沉积环境 湖北 |
| 文章编号： | 0253-4959(2002)03-0187-06 |
LECTOSTRATOTYPE SECTION OF THE EARLY JURASSIC XIANGXI FORMATION IN ZIGUI BASIN OF WESTERN HUBEI |
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| CHEN Hui ming,MENG Fan song,and ZHANG Zhen lai.LECTOSTRATOTYPE SECTION OF THE EARLY JURASSIC XIANGXI FORMATION IN ZIGUI BASIN OF WESTERN HUBEI[J].Journal of Stratigraphy,2002,26(3):187-192,234. |
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| Authors: | CHEN Hui ming MENG Fan song and ZHANG Zhen lai |
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| Abstract: | The Xiangxi Formation in the Zigui basin of western Hubei is one of the famous Lower Jurassic beds in South China. With the rise of the water lever in the reservoir area, the localities of stratotype, lectostratotype and reference section will be inundated by water. Therefore the Luojiagou section above the warning water level in the reservoir area is recommend to replace the Xiangxi Formation as a new lectostra totype section. Based on the detailed study of this section, a proposal is put forward that a boundary is drawn between the base of the Lower Jurassic Xiangxi Formation marked by conglomerate or grey white quartzose sandstone and the underlying Triassic. It is also justified that there was a pseudoconformity between the two series in the Zigui basin and also a continuous deposition there. Judging from the vertical diversity of the fossil plants, the fossil plants in the Luojiagou section may be divided into the Coniopteris\|Czekanowskia Assemblage above and the Coniopteris Ptilophyllum Assemblage below. At the same time, by analysis of the sedimentary environment of this section, it is pointed out that the Xiangxi Formation has a distinct rhythmicity and may be divided into four sedimentary cycles. |
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| Keywords: | Early Jurassic lectostratotype section plant assemblage environment Hubei |
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