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早-中三叠世高分辨率的δ13Ccarb新记录:来自华南天生桥剖面的研究

A new high-resolution δ13Ccarb record for the Early-Middle Triassic: Insights from the Tianshengqiao section, South China

  • 摘要: 以往的研究发现早三叠世存在显著的碳循环扰动.为了验证早-中三叠世碳同位素的变化趋势并深入理解这一时期碳循环规律,我们研究了华南天生桥剖面的早-中三叠世无机碳同位素(δ13Ccarb)组成.研究结果表明,天生桥剖面的δ13Ccarb值受到成岩作用的影响较小.δ13Ccarb首先在嘉陵江组一段呈现幅度为2.2‰的负偏移,随后在嘉陵江组三段底部呈现幅度为3.8‰的正偏移.接着,δ13Ccarb在嘉陵江组三段出现幅度为2.5‰的负偏移,随后在关岭组一段底部出现正偏移,最大值达到5.0‰.而后,δ13Ccarb呈现第三次负偏移,并在关岭组二段至杨柳井组恢复且稳定在+1‰至+2‰左右.天生桥剖面的δ13Ccarb地层变化趋势与全球同时期其他剖面的碳同位素地层演化趋势呈现出一致性.这一特征表明天生桥剖面的早-中三叠世地层记录较为完整.研究结果表明,天生桥剖面的δ13Ccarb变化特征能够代表全球碳循环的扰动.此外,天生桥剖面记录的碳循环扰动与缓慢生命复苏之间具有地层一致性,这一特征表明碳循环扰动的物理机制可能是导致早三叠世缓慢生命复苏的主要原因.

     

    Abstract: Previous studies have documented remarkable changes in the carbon cycle during the Early Triassic. To verify these trends and improve our understanding of carbon cycling during the Early-Middle Triassic, we investigate the new δ13Ccarb record for the Early-Middle Triassic in the Tianshengqiao section of South China. Our study shows that the δ13Ccarb values in the Tianshengqiao section have received minimal diagenetic alterations. The δ13Ccarb profile initially shows a negative excursion of 2.2‰ within the Member I of the Jialingjiang Formation, followed by a positive excursion of 3.8‰ in the lower part of the Member III of the Jialingjiang Formation. After that, δ13Ccarb displays a negative excursion of 2.5‰ in the Member III of the Jialingjiang Formation, followed by a positive excursion with a maximum of +5.0‰ at the base of the Member I of the Guanling Formation. Above the maximum value, the δ13Ccarb profile exhibits a third negative excursion and then recovers and stabilizes around +1‰ to +2‰ through the Member II of the Guanling Formation to the Yangliujing Formation. The observed trend of the δ13Ccarb profile in the Tianshengqiao section can be correlated with the global C-isotopic excursions derived from the coeval sections worldwide. The similarity of the Early-Middle Triassic δ13Ccarb profile to those from other sections worldwide is indicative of the near completeness of the stratigraphic interval of the Tianshengqiao section. Our results suggest that the δ13Ccarb profile in the Tianshengqiao section represents a global carbon cycle perturbation. The stratigraphic coincidence between the carbon cycle perturbation and the limited biotic recovery has been documented in the Tianshengqiao section, suggesting that the physical mechanism of the carbon cycle perturbation may have contributed to the prolonged biotic recovery.

     

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