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摘要:
贵州龙动物群是二叠-三叠纪大绝灭后海洋生态系统辐射发展阶段最晚期的典型代表，为了解其古环境信息，对贵州省兴义地区顶效及周边产地开展了精细剖面测量，采集碳酸盐岩进行了全岩碳氧同位素测试。测试结果显示：泥麦谷剖面δ13C值分布范围-6.3‰~2.6‰，δ18O分布范围在-5.7‰~-1.2‰；谢米剖面δ13C值分布范围在-4.5‰~2.5‰，δ18O在-5.7‰~-1.2‰；坝尾剖面δ13C值分布范围在0.5‰~2‰，δ18O在-6.4‰~0.1‰；顶效剖面δ13C值分布范围在-4.3‰~2.1‰，δ18O在-7.3‰~-2.5‰。根据碳氧同位素数据相关性分析显示泥麦谷、谢米、坝尾剖面的同位素值受后期成岩作用影响较小。在泥麦谷、谢米及顶效贵州龙动物群产出层位下段均出现明显的δ13C负异常，与低水位时期海洋生物快速死亡密切相关，也与火山作用存在一定的联系。由于顶效剖面受后期成岩作用影响，笔者利用泥麦谷、谢米及坝尾剖面δ18O数据对兴义地区古海水温度进行了恢复，结果显示温度分布在19~27℃，平均为23℃左右，说明当时属于温暖气候环境。
Abstract:Kueichousaurus fauna is the typical representative of the biological radiation in the latest Triassic marine ecosystem, In order to study the palaeoenvironment of the Kueichousaurus fauna, the authors measured the fine sections in Dingxiao and its adjacent areas of Xingyi, Guizhou Province, and tested the whole rock carbon and oxygen isotope compositions by using the carbonate rock. According to the analytical results, the δ13C values in Nimaigu section range from -6.3 ‰ to 2.6 ‰, and δ18O values are between -5.7‰ and -1.2‰; the δ13C values in Xiemi section range from-4.5‰ to 2.5‰, and δ18O values are in the range of -5.7‰——1.2‰; the δ13C values of Bawei section range from 0.5 ‰ to 2 ‰, and δ18O values are between -6.4‰ and 0.1‰; the δ13C values in Dingxiao section range from-4.3‰-2.1‰, and δ18O values are between-7.3‰ and 2.5‰. According to the correlation analysis of carbon and oxygen isotope data, the isotopic values of Nimaigu, Xiemi and Dingxiao sections were less affected by diagenesis. There are obvious negative δ13C anomalies in the lower part of the horizon of Kueichousaurus fauna in Nimaigu, Xiemi and Dingxiao, closely related to the rapid death of marine organisms in low-water-level periods and the volcanism. Due to the influence of late diagenesis on the Dingxiao section, the seawater paleotemperature in Xingyi area was recovered by using δ18O data of Nimaigu, Xiemi and Dingxiao sections. It is shown that the temperature was between 19 and 27℃, with an average about 23℃, which indicates a warm climate during that period.
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Key words:
- Kueichousaurus fauna /
- paleotemperature /
- carbon and oxygen isotope /
- Zhuganpo Formation
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表 1 泥麦古、谢米、坝尾、顶效剖面碳酸盐岩δ13C、δ18O分析数据
Table 1. Analytical data of carbon isotope, oxygen isotope from Nimaigu, Xiemi, Bawei and Dingxiao section
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