云南含罗平生物群层位锶同位素组成与演化
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摘要
现有公布的数据显示,海水87Sr/86Sr值在中三叠世安尼期较为平稳,有别于早三叠世因环境导致的动荡变化,为二叠纪末生物大灭绝之后生物复苏的加速期,而罗平生物群就是该加速期的标志性生物群。本文研究了含罗平生物群层位标准剖面-大凹子剖面上连续沉积的26件碳酸盐岩样品的锶同位素组成与演化,用于了解含罗平生物群层位沉积海水锶同位素的变化趋势。结果显示:(1)碳酸盐岩中Sr平均值大于2000×10-6,主要来自于文石和海洋成岩作用;(2)低Mn和Mn/Sr<0.4说明:87Sr/86Sr数据在很大程度上能代表同时期海水中的87Sr/86Sr比值;(3)这些样品的87Sr/86Sr值变化在0.707969～0.708253,平均值为0.708025,锶同位素比值变化曲线呈小幅度的起伏波动,其值明显大于同时期欧洲等地公布的数据,但同华南其他地区公布的数据具有相似性,推测含罗平生物群层位锶同位素组成仅代表区域事件,受印支运动影响。
The87 Sr/86 Sr curve of seawater is relatively stable in the Anisian period of Middle Triassic according to data available,which is different from the situation of frequent changes in the Early Triassic. The recovery of marine ecosystem from the endPermian mass extinction experienced an accelerating phase during the Anisian period. The Luoping biota is one of the typical representatives of the Triassic biota. The authors studied the composition and evolution of the strontium isotope in 26 carbonate samples from the standard section, i.e., Dawazi section, of the Luoping biota, in order to know the change of strontium isotope from the fossiliferous layers which contain the Luoping biota. The results show three remarkable characteristics:(1) The average value of Sr is more than 2000×10-6 from the carbonate, which is mainly caused by the aragonite and diagenesis;(2) the low value of Mn and the Mn/Sr ratios less than 0.4 show that the these87 Sr/86 Sr ratios can represent the composition of Sr isotope of the coeval seawater;(3) the ratios of87 Sr/86 Sr of all samples range between 0.707969 and 0.708253, with the average ratio 0.708025. It is notable that the ratios of the87 Sr/86 Sr are larger than the data for the same geological time published from Europe. Nevertheless, they are similar to Sr isotopic values from other areas in southern China. The authors therefore hold that the strontium isotope composition of the fossiliferous layers of the Luoping biota was not directly connected to global geological events, but affected by the regional event,such as the indosinian movement.
The87 Sr/86 Sr curve of seawater is relatively stable in the Anisian period of Middle Triassic according to data available,which is different from the situation of frequent changes in the Early Triassic. The recovery of marine ecosystem from the endPermian mass extinction experienced an accelerating phase during the Anisian period. The Luoping biota is one of the typical representatives of the Triassic biota. The authors studied the composition and evolution of the strontium isotope in 26 carbonate samples from the standard section, i.e., Dawazi section, of the Luoping biota, in order to know the change of strontium isotope from the fossiliferous layers which contain the Luoping biota. The results show three remarkable characteristics:(1) The average value of Sr is more than 2000×10-6 from the carbonate, which is mainly caused by the aragonite and diagenesis;(2) the low value of Mn and the Mn/Sr ratios less than 0.4 show that the these87 Sr/86 Sr ratios can represent the composition of Sr isotope of the coeval seawater;(3) the ratios of87 Sr/86 Sr of all samples range between 0.707969 and 0.708253, with the average ratio 0.708025. It is notable that the ratios of the87 Sr/86 Sr are larger than the data for the same geological time published from Europe. Nevertheless, they are similar to Sr isotopic values from other areas in southern China. The authors therefore hold that the strontium isotope composition of the fossiliferous layers of the Luoping biota was not directly connected to global geological events, but affected by the regional event,such as the indosinian movement.
引文
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Hu Shixue,Zhang Qiyue,Chen Zhongqiang,Zhou Changyong,LüTao,Xie Tao,Wen Wen,Huang Jinyuan,Benton M J.2011.The Luoping biota:exceptional preservation,and new evidence on the Triassic recovery from end-Permian mass extinction[J].Proceeding of the Royal Society B,278:2274-2282.
Hu Zuowei,Huang Sijing,Qing Hairuo,Wang Qingdong,Wang Chunmei,Gao Xiaoyong.2008.Evolution and global correlation for strontium isotopic composition of marine Triassic from Huaying Mountains,eastern Sichuan,China[J].Science in China Series D:Earth Sciences,51(4):540-549.
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Huang Sijing,Huang Keke,LüJie,Lan Yefang.2012.Carbon isotopic composition of Early Triassic marine carbonates,Eastern Sichuan Basin,China[J].Science China(Earth Sciences),55(12):2026-2038.
Huang Sijing,Qing Hairuo,Huang Peipei,Hu Zuowei,Wang Qingdong,Zou Mingliang,Liu Haonian.2008.Evolution of strontium isotopic composition of seawater from Late Permian to Early Triassic based on study of marine carbonates,Zhongliang Mountain,Chongqing,China[J].Science in China(Series D):Earth Sciences,51(4):528-539.
Huang Sijing,Shi He,Zhang Meng,Wu Wenhui,Shen Licheng.2002.Global correlation of strontium isotope evolution curve of Devonian in Longmen mountain and dating marine sediments[J].Progress in Natural Science,12(9):945-951(in Chinese).
Huang Sijing,Sun Zhilei,Wu Sujuan,Zhang Meng,Pei Changrong,Hu Zuowei.2006.Strontium isotope composition and control factors of global sea water in Triassic[J].Journal of Mineralogy and Petrology,26(1):43-48(in Chinese with English abstract).
Jiang Maosheng,Zhu Jiangquan,Chen Daizhao,Zhang Renhu,Qiao Guangsheng.2001.Carbon and strontium isotope variations and responses to sea-level fluctuations in the Ordovician of the Tarim Basin[J].Science in China(Series D):Earth Sciences,44(9):816-823.
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Kaufman A J,Knoll A H.1995.Neoproterozoic variations in the C-isotopic composition of seawater:stratigraphic and biogeochemical implications[J].Precambrian Research,73:27-49.
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