| 黔东北震旦纪陡山沱晚期庙河型生物群的生态特征及埋藏环境初探 |
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| 引用本文： | 王约,何明华,喻美艺,赵元龙,彭进,杨荣军,张振含.黔东北震旦纪陡山沱晚期庙河型生物群的生态特征及埋藏环境初探[J].古地理学报,2005,7(3):327-335. |
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| 作者姓名： | 王约 何明华 喻美艺 赵元龙 彭进 杨荣军 张振含 |
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| 作者单位： | 1.中国地质大学（北京）地球科学与资源学院 北京 100083;2.贵州大学资源与环境学院古生物及生物成矿研究所 贵州贵阳 550003;3.贵州省地质矿产勘查开发局103地质队 贵州铜仁 554300 |
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| 基金项目： | 国家自然科学基金;贵州省基础研究基金;贵州大学校科研和教改项目 |
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| 摘 要： | 贵州省东北部江口县桃映震旦纪陡山沱组上部发现的庙河型生物群，包括宏体藻类、可能的后生动物、遗迹化石以及其它生物化石等，进一步证实这类宏体生物群在扬子地区震旦纪陡山沱晚期有较为广泛的分布。通过与鄂西庙河生物群、皖南蓝田植物群的对比，震旦纪陡山沱晚期宏体生物群的生活环境主要为开阔浅海向台缘斜坡相过渡地带。通过对黔东北庙河型生物群的研究，认为陡山沱晚期的宏体生物群为以营固着生活方式为主，生活于透光性较好、具有一定水动力条件和一定含氧量的相对静水贫氧浅海环境；其固着基底为富含水份的未固结的粥性-软质基底。这些宏体生物群多呈半漂浮状竖立于海底，构成初步的“海底草原”，为生物群中依赖一定氧而生活、生长和繁殖的动物提供了必要的支持。生物死亡后，大部分生物躯体倒伏于沉积物表面，在贫氧和较快沉积速率的沉积环境中，生物遗体被较好保存，并很快被沉积物所埋藏。随着沉积物的增厚，生物遗体被完全封闭，导致生物遗体腐烂和分解过程终止，使其得以很好保存。较快的沉积速率、贫氧和相对平静水体的环境是生物群得以很好保存的重要因素。
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| 关 键 词： | 庙河型生物 群沉积环境 埋藏环境 陡山沱晚期 震旦纪 贵州省 |
| 文章编号： | 1671-1505（2005）03-0327-09 |
| 收稿时间： | 2004-11-01 |
| 修稿时间： | 2004-12-20 |
Preliminary discussion on ecological characteristics and buried environments of Miaohe-type Biota during the Late Doushantuoian of Sinian in northeastern Guizhou Province |
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| Wang Yue,He Minghua,Yu Meiyi,Zhao Yuanlong,Peng Jin,Yang Rongjun,Zhang Zhenhan.Preliminary discussion on ecological characteristics and buried environments of Miaohe-type Biota during the Late Doushantuoian of Sinian in northeastern Guizhou Province[J].Journal of Palaeogeography,2005,7(3):327-335. |
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| Authors: | Wang Yue He Minghua Yu Meiyi Zhao Yuanlong Peng Jin Yang Rongjun Zhang Zhenhan |
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| Institution: | 1.School of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083;2.School of Resource and Environment, Guizhou University, Guiyang 550003, Guizhou;
3 103 Geological Party, Guizhou Bureau of Geology and Mineral Exploration and Development, Tongren 554300, Guizhou |
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| Abstract: | The Miaohe-type Biota that are found from the upper part of Doushantuo Formation of Sinian at Taoying Town, Jiangkou County, northeastern Guizhou Province, South China includes macroalgal, possible metazoan, ichnofossil, and other fossils, and it was further more proved that the macrobiota was distributed widely in seafloor in Yangtze area, South China, during the Late Doushantuo Age of Sinian. Comparing with the Miaohe Biota in western Hubei Province and Lantian Flora in southern Anhui Province, we consider that the macrobiota mainly lived in the transitional area from the open platform to the platform edge slope facies. Studies on the Miaohe-type Biota in northeastern Guizhou, suggest that the life styles of macrobiota in the Late Doushantuo Age were mainly fixing on and attaching to the surface of seafloor, that the macrobiota lived in relatively calm-water shallow sea with abundant light, poor-oxygen, and a measure of water-energy, and that the ground macrobiota living on was the unfirmed soup-soft ground with rich water. During the Late Doushantuo Age, most of the macro-organisms were erect and semi-floating on the seafloor. They formed primitive “submarine grassland”, and produced oxygen to provide animals that depended on oxygen for living and reproducing. After these organisms were dead, their corpses laid on the surface of sediments and could be kept well in the environment with poor oxygen and fast sedimentation rate. Then they were buried rapidly by sediments. With the sediments being increased, these corpses were closed perfectly in the sediments to stop the decaying and decomposing process, and the macrobiota are preserved very well. The fast sedimentation rate, poor oxygen and comparatively calm-water environment are important factors making the biota be preserved well. |
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| Keywords: | Miaohe-type Biota sedimentary environments buried environments Late Doushantuoian Sinian Guizhou Province |
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