• 责任者：Liu Jiang (Bureau of Geology and Mineral Resources of Hainan Province ; Bureau of Marine Geological Survey of Hainan Province ; Haikou 570206 ; China) ; Bai Zhiqiang
• 刊名：Journal of Stratigraphy
• 出版年：2009
• 卷期：33(2)
• 关键词：生物地球化学 ; biogeochemistry
• 页码：p.155-164
• 图表：1 illus., 7 tables, 33 refs.
• 分类号：0600
• issnNo：ISSN0253-4959
• isbnNo：CN32-1187/P

///Organisms have different levels of selective absorbability, utilization and enrichment on different elements and stable isotopes in their living environments. The exact mechanisms of the selectivity can be explained by its body structures through the molecular level. Due to environmental changes in trace elements and stable isotopes, and their different ecological amplitudes and biological tolerance, organisms do not have consistent responses to these changes. For those elements with narrow biological tolerance, life-forms have a greater effect and specialized selectivity. And for those elements with wide ecological amplitudes, biological effects and selectivity are weakened. These ecological amplitudes may be overlapped between different life-forms. The δ ^{oft-com:office:smarttags" />13 C and} δ ¹⁸ O and their tendency of changes in the “secondary layers” of some fossil shells and their surrounding rocks are consistent. These responses are tested in different extents using the brachiopod fossils Rhynchospirifer and Stringocephalus, as well as their surrounding rocks.oft-com:office:office" />