西藏文布当桑二叠系-三叠系界线剖面碳酸盐岩碳氧同位素异常研究
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中国地质科学院地质力学研究所,中国地质科学院,成都理工大学,长江大学资源与环境学院,成都理工大学,中国地质科学院

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国家自然科学基金项目(青年基金)


13-18 O Isotopic Anomalous Study of the Carbonate Rock at the Wenbudangsang PTB Section, Tibet
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Institute of Geomechanics, Chinese Academy of Geological Sciences,Chinese Academy of Geological Sciences,Institute of Sedimentary Geology, Chengdu University of Technology,College of Resource and Environment, Yangtze University,Institute of Sedimentary Geology, Chengdu University of Technology,Chinese Academy of Geological Sciences

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    摘要:

    华南海相二叠系-三叠系界线(PTB)剖面研究相当成熟,且滇东黔西和天山地区的陆相PTB剖面也取得了重大突破,但西藏特提斯域该领域研究相对薄弱。在前人建立完整二叠系-三叠系牙形刺生物地层剖面的基础上开展碳氧同位素分析,研究表明西藏文布当桑PTB剖面附近碳同位素明显负偏,但偏移样式与华南煤山剖面突变模式具有明显差异,表现为随时间推移逐渐变小,且变化连续,类似南阿尔卑斯地区PTB剖面变化样式,通过与中下扬子地区代表碳酸盐岩台地相到下斜坡相沉积环境的典型海相PTB地层剖面对比发现,西藏文布当桑剖面与江苏西山浅水碳酸盐岩台地相剖面碳同位素变化曲线高度一致。此外,西藏文布当桑PTB剖面伴随碳同位素负偏,出现了两次明显的氧同位素波动,氧同位素两次负偏对应着海水温度的增加和盐度的降低。

    Abstract:

    The research on the marine PTB in South China has been well- established, and the significant breakthrough has beenmade on the terrestrial PTB in eastern Yunnan Province, western Guizhou Province and Tianshan Mountains, but still poor in that of the Tibetan Tethys region. This research conducted C and O isotopic composition analysis for the complete Permian- Triassic conodonts biostratigraphy column established by the previous studies. The analysis results indicate an obvious negative excursion on the 13 C isotopic composition at the PTB in the Wenbudangsang section (Tibet), but the excursion pattern is distinguished from that of the Meishan section in South China. To be specific, the pattern shows that its δ13 C carb decreased continuously as time passed by, which was similar to that of the PTB in South Alps. Comparison with the typical marine PTB in the Yangtze region which represents the transition of depositional environment from carbonates platform to lower shelf facies suggests that the δ13C carb excursion pattern from the Wenbudangsang section (Tibet) is highly consistent with that of the Xishan (Jiangsu Province) shallow carbonates platform. Two events of obvious 18 O isotopic negative excursion cooccurring with the negative δ13 C carb excursion at the PTB of the Wenbudangsang section (Tibet) may be related to the seawater temperature increasing and salinity decreasing during that time.

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季长军,吴珍汉,伊海生,夏囯清,赵珍,王霆.2018.西藏文布当桑二叠系-三叠系界线剖面碳酸盐岩碳氧同位素异常研究[J].地质学报,92(10):2018-2027.
JI Changjun, WU Zhenhan, YI Haisheng, XIA Guoqing, ZHAO Zhen, WANG Ting.2018.13-18 O Isotopic Anomalous Study of the Carbonate Rock at the Wenbudangsang PTB Section, Tibet[J]. Acta Geologica Sinica,92(10):2018-2027.

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  • 收稿日期:2017-10-23
  • 最后修改日期:2018-01-18
  • 录用日期:2018-10-29
  • 在线发布日期: 2018-10-29
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