Carbon Isotope Records Indicative of Paleoceanographical Events at the Latest Permian Dalong Formation at Shangsi, Northeast Sichuan, China

Bai Xiao , Luo Genming , Wu Xia , Wang Youzhen , Huang Junhua , Wang Xinjun
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引用次数: 15

Abstract

Paired organic and carbonate carbon isotope compositions of Late Permian Wujiaping and Dalong formations at Shangsi, Northeast Sichuan were analyzed by MAT 251. An abrupt negative excursion in the two isotope records was observed in the middle part of Dalong Formation, in association with a drop in the carbon isotope difference of the two records and an increase of total organic carbon (TOC) content. The negative drop of the paired carbon isotope records is suggestive of the input of 12C-enriched CO2. The molecular ratios of pristane to phytane and dibenzothiophene to phenanthrene indicate the anoxic condition in this interval. The enhanced TOC content is indicative of the elevated preservation of organic matter due to the anoxic condition. These isotopic and organic geochemical data probably infer the occurrence of the upwelling in this interval. The additional contribution of volcanism activity observed in South China cannot be excluded to the input of 12C-enriched CO2 and the negative shifts in carbon isotope composition of bulk organic matter and carbonate.

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川东北上寺大龙组晚二叠世古海洋事件的碳同位素记录
利用MAT251对川东北上思地区晚二叠世吴家坪组和大龙组的有机碳和碳酸盐碳同位素组成进行了配对分析。在大隆组中部观察到两个同位素记录的突然负偏移,这与两个记录的碳同位素差异的下降和总有机碳(TOC)含量的增加有关。成对碳同位素记录的负下降表明输入了富含12C的CO2。棱镜烷与植烷、二苯并噻吩与菲的分子比表明了该区间的缺氧条件。TOC含量的增加表明由于缺氧条件而提高了有机物的保存。这些同位素和有机地球化学数据可能推断出该层段上升流的发生。在华南观察到的火山活动的额外贡献不能排除在富含12C的CO2的输入以及大量有机物和碳酸盐的碳同位素组成的负变化之外。
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