西藏羌南坳陷中侏罗统夏里组硅化木的发现及意义

Discovery of silicified wood in the Middle Jurassic Gyari Formation in the southern Qiangtang depression, Tibet, China, and its significance.

Section of Sedimentation and Energy Geology, Chengdu Institute of Geology and Mineral Resources,China Geological Survey, Chengdu 610082, Sichuan，China

摘要: 摘要:首次在羌南地区的地层中发现了硅化木化石，对硅化木的基本特征进行了描述，根据孢粉组合特征，将地层定为中侏罗统夏里组，硅化木初步定为南洋杉。同时，孢粉组合的特征反映出该区中侏罗世具干旱古气候特点。结合前人晚三叠世硅化木的发现，对羌塘盆地的性质及演化提出了新的思考。
- 硅化木 /
- 夏里组 /
- 中侏罗统 /
- 羌南坳陷 /
- 西藏
Abstract: Abstract: Recently silicified wood has been for the first time discovered in Middle Jurassic strata in southern Qiangtang, and its basic features are described. According to the features of the sporopollen assemblage, the strata is determined to be the Middle Jurassic Gyari Formation and the silicified wood is preliminarily designated as Araucarioxylon. The features of the sporopollen assemblage reflect that the Middle Jurassic climate was dry and hot in this area. According to this discovery, combined with the silicified wood discovered by previous researchers in Triassic strata, the authors present new ideas about the Middle Jurassic tectonic evolution and character of the Qiangtang basin.
- silicified wood /
- Gyari Formation /
- Middle Jurassic /
- southern Qiangtang depression /
- Tibet