• 责任者：Cheng Hongguang (State Key Laboratory of Environmental Geochemistry ; Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang ; 550002 ; China) ; Li Xinqing
• 刊名：Acta Geoscientica Sinica
• 出版年：2009
• 卷期：30(1)
• 关键词：氧同位素 ; oxygen isotopes ; 碳同位素 ; carbon isotopes ; 泥盆纪 ; Devonian ; 四川 ; Sichuan Province
• 页码：p.79-87
• 图表：6 illus., 42 refs.
• 分类号：1300
• issnNo：ISSN1006-3021
• isbnNo：CN11-3474/P

The stable isotopic information in biogenic calcite was used to calculate the isotopic composition of seawater in the geological history. Brachiopod shell, due to its resistant ability to diagenesis (low magnesium calcite) and widespread distribution, was considered to be one of the ideal samples in the study of seawater isotopic composition in Paleozoic. The authors measured carbon and oxygen isotopic composition of well-preserved Longmenshan brachiopod shells, and established the seawater isotopic variation curve of Devonian and discussed the influencing factors. The results shows that: the δ¹³C value range from -2‰ to 2‰ (PDB) with three cycles, it every high value corresponding to one reef building event in Longmenshan area. The results indicated that temperature is possibly the factor controlling the oxygen isotopic composition of sea water.