Carbon Oxygen Isotope Analysis and Its Significance of Carbonate in the Zhaogezhuang Section of Early Ordovician in Tangshan, North China
Carbon Oxygen Isotope Analysis and Its Significance of Carbonate in the Zhaogezhuang Section of Early Ordovician in Tangshan, North China
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华北唐山早奥陶世赵各庄剖面碳酸盐岩碳氧同位素分析及其意义
DOI：
10.1007/s12583-013-0386-2
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发表时间：
2013-12
影响因子：
3.3
通讯作者：
Bao Zhengyu
中科院分区：
文献类型：
--
作者：
Yang Zhenhong;Zhang Ning;Dong Jinxiu;Xia Wenchen;Bao Zhengyu
In the Early Ordovician Zhaogezhuang Section of Tangshan , North China, the Yeli Formation is composed of an entire third-order sequence, with facies ranging from the inner ramp restricted platform and open marine to the middle and even outer ramps. The Liangjiashan Formation is dominated by highstand system tracts (HST) with predominantly inner ramp grain-shoal and lagoon facies. Analyzing the carbon and oxygen isotope during the.whole-rock carbonate reveals the δ 13 C values in the Yeli Formation range from -7.11‰–0.76‰ (PDB), with the mean value at -2.98‰, while the δ 18 O values range of -9.09‰– -4.65‰ with the mean value at -6.12‰. The δ 13 C values in the Liangjiashan Formation range of -1.15‰–0.3‰, and the mean value of -0.57‰; the δ 18 O values are -8.76‰– -7.48‰, and the mean value is -8.06‰. The δ 13 C values in the Yeli Formation decrease, but at the bottom of the Liangjiashan Formation the values increase steadily. In the middle-upper formation, there is an extended fluctuation between 0– -1.00‰. The δ 13 C trend in the studied section is similar to that of the contemporary sections, except that it has much lower δ 13 C values and a more negative excursion. The correlation between the δ 13 C changes and the eustatic events, as well as the sedimentary facies, indicates that in the Tangshan area, the carbon isotope evolution can be attributabled to the processes of the eutrophic sea/oligotrophic sea, the seafloor organismmediated oxidation in shallow water and the organic reduction after maximum flooding. The changes in the carbon isotope contents were.primarily affected by the regional relative sea level changes. Compared to the other coeval data, the Early Ordovician of the Tang shan area is.also severely depleted in 18 O, with all of the δ 18 O sample values being below -5‰, except for one sample with a value of -4.65‰. With the ancient seawater having a δ 18 O value of -5.5‰ (SMOW), it is reasonable to delineate a temperature of less than 37 .
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影响因子：
12.1
作者：
A. Prokoph;G. Shields;J. Veizer
通讯作者：
A. Prokoph;G. Shields;J. Veizer
DOI：
--
发表时间：
2002
期刊：
Acta Geological Sinica
影响因子：
--
作者：
Wang Darui
通讯作者：
Wang Darui
影响因子：
3.5
作者：
K. Tobin;K. Walker;D. M. Steinhauff;C. Mora
通讯作者：
K. Tobin;K. Walker;D. M. Steinhauff;C. Mora
DOI：
--
发表时间：
2000
期刊：
Geological Journal of China Universitiesf
影响因子：
--
作者：
F. Hong
通讯作者：
F. Hong
DOI：
10.1016/s0031-0182(03)00304-3
发表时间：
2003-06
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
A. Munnecke;C. Samtleben;T. Bickert
通讯作者：
A. Munnecke;C. Samtleben;T. Bickert