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| 西宁盆地谢家剖面车头沟组底部木化石的发现及其意义 | |
| 引用本文： | 陈传飞,苗运法,方小敏,宋春晖,戴霜,闫晓丽,张启波.西宁盆地谢家剖面车头沟组底部木化石的发现及其意义[J].地质学报,2009,83(8):1104-1109. |
| 作者姓名： | 陈传飞 苗运法 方小敏 宋春晖 戴霜 闫晓丽 张启波 |
| 作者单位： | 1. 兰州大学西部环境教育部重点实验室,资源环境学院,兰州,730000 2. 中国科学院青藏高原研究所,北京,100085 3. 兰州大学西部环境教育部重点实验室,资源环境学院,兰州,730000;中国科学院青藏高原研究所,北京,100085 4. 青海油田公司勘探开发研究院,甘肃敦煌,736202 |
| 基金项目： | 中国科学院知识创新项目,教育部科学技术研究重大项目，国家自然科学基金项目（面上项目，重点项目，重大项目）,中国博士后科学基金 |
| 摘 要： | 首次在西宁盆地谢家剖面车头沟组底部发现原始埋藏的钙质木化石不仅填补了植物大化石缺失的历史,同时对研究青藏高原东北部的植物生态环境演化和构造运动具有重要意义。通过对木化石埋藏特征、层位地层岩性和沉积环境的综合分析,认为其为近水河岸生长的成年乔木化石,株距3－8米不等,形成具有一定空间结构的植物群落,后期由于附近山地的隆起和该区气候向干旱化发展,植物遭受掩埋后经过石膏的交代作用进而形成硫酸钙质化石,说明该地区气候从中新世早中期开始恶化加剧。 |
| 关 键 词： | 西宁盆地 车头沟组 木化石 首次发现 早中新世 |
| 收稿时间： | 2008/10/28 0:00:00 |
| 修稿时间： | 2009/2/10 0:00:00 |
The discovery and significance of the fossil woods in the bottom of chetougou formation in Xiejia section,Xining Basin |
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| Chen Chuanfei,Miao Yunf,Fang Xiaomin,Song Chunhui,Dai Shuang,Yan Xiaoli and Zhang Qibo.The discovery and significance of the fossil woods in the bottom of chetougou formation in Xiejia section,Xining Basin[J].Acta Geologica Sinica,2009,83(8):1104-1109. | |
| Authors: | Chen Chuanfei Miao Yunf Fang Xiaomin Song Chunhui Dai Shuang Yan Xiaoli and Zhang Qibo |
| Abstract: | The original burial fossil woods excavation at the bottom of the Chetougou formation in Xiejia section, Xining Basin, is not only the first found of the big plant fossil in the arid-semiarid region in NW China, but also greatly significant to research the evolution of plant ecological environment and even the tectonic movement in northeastern Tibetan Plateau. Through the comprehensive analysis of the buried fossil woods characteristics, rock-layer facies and sedimentary environment, we consider that they are adult trees growing near the bank of river, and spacing in the rows ranging from 3-8 meters, which formed the good plant communities with a certain spatial structure. Then,the uplift of the vicinal mountains and the development of arid climate in this area, the plants were buried and the metasomatism with plaster took place, and then formed the calcium sulfate fossil woods, which could show the climate deteriorated in the region since the early-Miocene. |
| Keywords: | Xining Basin Chetougou formation fossil woods first found early-Miocene |
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