weight: bold" lang=EN-US>Oligocene Lacustrine Stromatolites in the Tuotuohe Basin, Qinghai-Tibetan Plateau: Paleoclimate Conditions Recorded by the Rhythmic Laminations

• 责任者：Hui Bo (Institute of Sedimentary Geology ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Yi Haisheng
• 刊名：Geological Bulletin of China
• 出版年：2010
• 卷期：29(1)
• 关键词：渐新世 ; Oligocene ; 叠层石 ; stromatolites ; 青藏高原 ; Qinghai-Tibetan Plateau
• 页码：p.62-69
• 图表：4 illus., 1 table, 24 refs.
• 分类号：1200
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

A group of lacustrine stromatelites growing in the process of the flooding lake is discovered in the Oligocene Yaxicuo Group of Tongtianhe section, Tuotuohe Basin. The shape patterns and microstructure of stromatolite laminations show the rhythm demonstrated by microbial micrite layers(dark layers) and grain-rich layers(light layers), three-level growth rhythm, gradational contact relation in the middle of the couplet while abrupt in the lamina growth bands. It’s showed that the climate was hot and wet in the growth period of dark layers, while colder and drier in the growth period of light layers. The lacustrine stromatelites are controlled by periodic climate change, which preserve plentiful paleoclimate informations.