CARBON AND OXYGEN ISOTOPE COMPOSITION ANDPALAEOENVIRONMENTAL CHARACTERISTICS OFJULINSHAN SECTION (LATE GUZHANGIAN) INHANDONG PROVINCE NORTH CHINA

摘要

Carbon and oxygen isotope in Cambrian ma- rine carbonate rock preserves a massive amount of information about past climate, particularly temper- ature changes. In this study, 57 carbonate samples were collected from the Julinshan section with a total thickness of 102.32 m in Shandong Province of North China for their carbon and oxygen isotopic compositions. The results show that the o13CPDB and 818OPDB values normally changing with a range of about 1.13% and 0.76% respectively, indicating that these samples record a memory of global scale sea- level fluctuations, which result explained why that consists mostly of limestone and shale alternate fre- quently up to 100 meters through six fossil zones. The most important reason is climate change with frequent alternating spells of warmth and cold; itmay relate to global-scale sea-level fluctuations, paleoecological environmental changes, global transgression, and regression events.