贵州龙动物群产出层位碳氧同位素研究
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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‰,δ~(18)O分布范围在-5.7‰～-1.2‰;谢米剖面δ~(13)C值分布范围在-4.5‰～2.5‰,δ~(18)O在-5.7‰～-1.2‰;坝尾剖面δ13C值分布范围在0.5‰～2‰,δ~(18)O在-6.4‰～0.1‰;顶效剖面δ~(13)C值分布范围在-4.3‰～2.1‰,δ~(18)O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δ~(13)C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δ~(18)O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。
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 δ~(13)O values in Nimaigu section range from-6.3 ‰ to 2.6 ‰, and δ~(18)O values are between-5.7‰ and-1.2‰; the δ~(13)O values in Xiemi section range from-4.5‰ to 2.5‰, and δ~(18)O values are in the range of-5.7‰--1.2‰; the δ~(13)O values of Bawei section range from 0.5 ‰ to 2 ‰, and δ~(18)O values are between-6.4‰ and 0.1‰; the δ~(13)O values in Dingxiao section range from-4.3‰-2.1‰, and δ~(18)O values are between-7.3‰ and 2.5‰. According to thecorrelation 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 δ~(13)O 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 δ~(18)O 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.
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 δ~(13)O values in Nimaigu section range from-6.3 ‰ to 2.6 ‰, and δ~(18)O values are between-5.7‰ and-1.2‰; the δ~(13)O values in Xiemi section range from-4.5‰ to 2.5‰, and δ~(18)O values are in the range of-5.7‰--1.2‰; the δ~(13)O values of Bawei section range from 0.5 ‰ to 2 ‰, and δ~(18)O values are between-6.4‰ and 0.1‰; the δ~(13)O values in Dingxiao section range from-4.3‰-2.1‰, and δ~(18)O values are between-7.3‰ and 2.5‰. According to thecorrelation 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 δ~(13)O 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 δ~(18)O 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.
引文
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Korte C,Kozur H W,Veizer J.2005.δ13C andδ18O values of Triassic brachiopods and carbonate rocks as proxies for coeval seawater and palaeotemperature[J].Palaeogeography,Palaeoclimatology,Palaeoecology,226(3):287-306.
Li Jinling,RIieppel Olivier.2004.A new nothosaur form Middle Triassic of Guizhou,China[J].Vertebrata Palasiatica,42(1):1-5(in Chinese with English abstract).
Li Rongxi,Wei Jiayong,Xiao Jiafei,Wang Xingli,Lehrmann D J.2007.Response of carbon and oxygen isotopic geochemistry to transgressive systems tract:an example from Triassic Stratigraphy in Southwestern Guizhou Province[J].Journal of Earth Sciences and Environment,29(1):1-5(in Chinese with English abstract).
Li Zhiguang,Sun Zuoyu,Jiang Dayong,Ji Cheng.2016.LA-ICP-MS Zircon U-Pb age of the fossil layer of Triassic Xingyi Fauna from Xingyi,Guizhou,and its significance[J].Geological Review,62(3):779-790(in Chinese with English abstract).
Luo Beiwei,Wei Guoqi,Yang Wei,Dong Caiyuan.2013.Reconstruction of the late Sinian paleo-ocean environment in Sichuan basin and its geological significance[J].Geology in China,40(4):1099-1111(in Chinese with English abstract).
Luo Shunshe,Wang Kaiming.2010.Carbon and oxygen isotope composition of carbonatic rock from the Mesoproterozoic Gaoyuzhuang Formation in the Kuancheng area,Hebei Province[J].Aata Geologica Sinica,84(4):492-499.
Ma Letian,Ji Cheng,Sun Zuoyu,Yang Pengfei,Zou Xiaodong.2013.Biodiversity and stratigraphic distribution of the Triassic Xingyi marine reptile fauna,Guizhou Province[J].Journal of Stratigraphy,37(2):178-185(in Chinese with English abstract).
Marshall J D.1992.Climatic and oceanographic isotopic signals from carbonate rock record and their preservation[J].Geological Magazine,129:143-160.
Mei Mingxiang,Ma Yongsheng,Deng Jun,Meng Qingfen,Yi Dinghong,Li Donghai.2003.Sequence-stratigraphic frame work of the Early to Middle Triassic and evolution of Sedimentaryfacies and paleogeography in the Nanpanjiang Basin and its adjacent areas:discussion on evolutionary process from the Dianqiangui Basin to the Nanpanjiang[J].Geological Journal of China Universities,9(3):427-439(in Chinese with English abstract).
Meyer K M,Yu M,Lehrmann D,Schootbrugge B,Payne J L.2013.Constraintson on Early Triassic carbon cycle dynamics from paired organic and inorganic carbon isotope records[J].Earth and Planetary Science Letters,361(1):429-435.
Moustafa M S H,Pope M C,Grossman E L,Mriheel I Y.2016.Carbon and oxygen isotope variations of the Middlee Late Triassic Al Aziziyah Formation,northwest Libya[J].Journal of African Earth Sciences,118:149-162.
Muttoni G,Mazza M,Mosher D,Katz M E,Kent D V,Balini M.2014..A Middle-Late Triassic(Ladinian-Rhaetian)carbon and oxygen isotope record from the Tethyan Ocean[J].Palaeogeography,Palaeoclimatology,Palaeoecology,399(4):246-259.
Qing H R,Veizer J.1994.Oxygen and carbon isotopic composition of Ordovician brachiopods:implications for coeval seawater[J].Geochimica et Cosmochimica Acta,58(20):4429-4442.
Scholle P A,Arthur,M A.1980.Carbon isotope fluctuations in Cretaceous pelagic limestone:potential stratigraphic and petroleum exploration tool[J].American Association of Petroleum Geologists Bulletin,64(1):67-87.
Shao Longyi.1994.The relation of the oxygen and carbon isotopic in the carbonate rocks to the Paleotemperature etc.[J].Journal of China University of Mining&Technology,23(1):39-45(in Chinese with English abstract).
Song Huyue,Tong Jinnan,Tian Li,Song Haijun,Qiu Haiou,Zhu yuanyuan,Thomas Algeo.2014.Paleo-redox conditions across the Permian-Triassic boundary in shallow carbonate platform of the Nanpanjiang Basin,South China[J].Science China:Earth Sciences,57:1030-1038(in Chinese).
Song H Y,Tong J N,Algeo T J,Horacekc M,Qiu H O,Song H J,Tian L,Chen Z Q.2013.Large verticalδ13CDICgradients in Early Triassic seas of the South China craton:implications for oceanographic changes related to Siberian Traps volcanism[J].Global and Planetary Change,105:7-20.
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