The Oxygen and Carbon Isotopic Signatures of Laminations in Lacustrine Stromatolites and Palaeoenvironmental Significances of Growth Rhythmites
详细信息
- 责任者：Yi Haisheng (Institute of Sedimentary Geology ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Shi Zhiqiang
- 刊名：Earth Science Frontiers
- 出版年：2009
- 卷期：16(6)
- 关键词：叠层石 ; stromatolites ; 古环境 ; paleoenvironment ; 纹理 ; laminations ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.168-176
- 图表：4 illus., 1 table, 48 refs.
- 分类号：0803
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The lacustrine stromatolites from the Oligocene Yaxicuo Formation of the northern Tibetan Plateau display regular growth rhythms of dark (organic-rich layer) and light (sediment-rich layer) lamination alternations with millimeter scale. The analysis results showed that the dark lamina in stromatolites commonly has relatively higher δ18O and δ13C values than the light lamina. The authors suggest that the couplets of laminae in lacustrine stromatolites indicate the origin of annual lamination. This study demonstrates the lamination in lacustrine stromatolites can provide a kind of geologic material with high-resolution to reconstruct terrestrial palaeoclimate and palaeoenvironment changes during the geologic history.