| 摘要: |
| 辽西凌源雾迷山组碳酸盐岩碳氧同位素和Mn/Sr比值数据反映了碳酸盐岩的原始沉积特征。δ13CPDB数值范围-2‰~2‰,δ18OPDB数值范围为-10‰~-4‰,其平均值分别为0.15‰,-6.2‰,碳同位素组成具有旋回性变化特征。在雾迷山组一段中上部,δ13C表现出明显的正漂移,可能为藻类的大量繁殖、有机碳增加所引起。δ18O的增加为气候变冷和冰川作用的结果。在δ13C为负值的层段,δ18O数值较高。碳氧同位素组成的这种特征可能与海平面变化有关。 |
| 关键词: 辽西 凌源 雾迷山组 碳氧同位素 海平面变化 |
| DOI： |
| 附件 |
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| 基金项目:国家自然科学基金“辽东地区臼齿碳酸盐岩显微组构与岩石地球化学研究”(40772078);中石化海相前瞻性项目“燕山地区中新元古界层序地层学与沉积相研究(G0800-06-ZS-350) |
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| Carbon and oxygen isotopic evolution in the carbonate rocks from the Wumishan Formation in Lingyuan,western Liaoning |
| LI Xin, LUO Shun-she, KUANG Hong-wei, SU Jie, YIN Xiao |
(1. Key Laboratory of Oil Resources, Yangtze University, Jingzhou 434023, Hubei, China;
2. School of Geosciences, Yangtzi University, Jingzhou 434023, Hubei, China;
3. School of Geophysics and Oil Resources, Yangtze University, Jingzhou 434023, Hubei, China) |
| Abstract: |
| The original deposits of the carbonate rocks from the Wumishan Formation in Lingyuan,western Liaoning are explored on the basis of carbon and oxygen isotopic and Mn/Sr ratios.The δ13CPDB values range between-2‰ and 2‰ and δ18O values range between-10‰ and-4‰,with an average of 0.15‰ and-6.2‰,respectively.The δ13C values exhibit a markedly positive shift in the carbonate rocks from the upper and middle parts of the first member of the Wumishan Formation.This shift may be caused by abundant algal production and organic carbon increase.The climatic cooling down and glaciation gave rise to the increase of δ18O values,especially in the levels with negative δ13C values.The carbon and oxygen isotopic evolution in the carbonate rocks may be correlated to the sea-level changes. |
| Key words: Western Liaoning Lingyuan Wumishan Formation carbon and oxygen isotopes sea-level changes |
