Terrestrial record of carbon-isotope shifts across the Norian/Rhaetian boundary: A high-resolution study from northwestern Sichuan Basin, South China
Terrestrial record of carbon-isotope shifts across the Norian/Rhaetian boundary: A high-resolution study from northwestern Sichuan Basin, South China
复制标题
跨越诺里安/雷蒂亚边界的碳同位素变化的陆地记录：华南四川盆地西北部的高分辨率研究
DOI：
10.1016/j.gloplacha.2022.103754
复制
发表时间：
2022-01
影响因子：
3.9
通讯作者：
Manuel Rigo
中科院分区：
文献类型：
--
作者：
Xin Jin;James G. Ogg;Song Lu;Zhiqiang Shi;David B. Kemp;Xia Hua;Tetsuji Onoue;Manuel Rigo
在Norian/Rhaetian边界（NRB）记录了一系列生物危机和更替，以及一个或多个负碳同位素变化形式的全球碳循环的假定扰动。尽管有这些证据，但诺里安/雷蒂安气候变化的全面验证还不可能。特别是，没有明确的记录Norian/Rhaetian环境变化尚未恢复从陆地设置。Angayucham大火成岩省的喷发被认为是NRB负碳同位素位移的可能原因。汞作为火山活动的代用指标，在许多古代海洋和陆地沉积物中得到了很好的研究，但迄今为止，没有汞记录已获得整个NRB。利用旋回地层学和磁性地层学方法，对四川盆地西北部广元以北的一个陆相Norian-Rhaetian剖面（须家河剖面）进行了对比研究。在整个NRB间期，δ 13 Corg存在长期负趋势，叠加了四次负移。这可以与欧洲海洋站点剖面中识别的第三个负δ 13 Corg偏移（命名为S3）的最高部分相关联。须家河剖面的同期Hg浓度、Hg/Al和Hg/TOC异常可能是大规模火山活动造成的。δ 13 Corg（约1.50 μ m）的大幅度变化，是一个重要的信号。-5.2 ‰），我们观察到的建议是与当地野火和增强粗泥沙输入，表明在NRB期间的显着的环境变化。在其他灭绝事件中也注意到了类似的古气候扰动（例如，二叠纪末大规模灭绝事件），由于大火成岩省的侵位，或因为长英质火山作用。
A series of biotic crises and turnovers have been recorded at the Norian/Rhaetian boundary (NRB), together with a putative perturbation to the global carbon cycle in the form of one or more negative carbon-isotope shifts. Despite this evidence, the full validation of Norian/Rhaetian climate changes has not been possible. In particular, no clear record of Norian/Rhaetian environmental change has yet been recovered from a terrestrial setting. The eruption of the Angayucham Large Igneous Province has been considered as a possible cause for the putative NRB negative carbon-isotope shifts. Hg as a volcanism proxy has been well-studied in many ancient marine and terrestrial sediments, but to date no Hg record has been obtained across the NRB. In this study, we focus on a terrestrial Norian-Rhaetian section (Xujiahe section) located north of Guangyuan in the northwestern Sichuan Basin, which has been correlated to the NRB using cyclostratigraphy and magnetostratigraphy. A long-lived negative trend in δ13Corg, superimposed with four negative shifts, is recognized across the NRB interval. This can be correlated to the uppermost part of the third negative δ13Corgshift (named S3) recognized in profiles from marine sites in Europe. Contemporaneous Hg concentration, Hg/Al and Hg/TOC anomalies in the Xujiahe section were possibly caused by large-scale volcanic activity. The large amplitude changes in δ13Corg(ca. −5.2‰) that we observe are suggested to be associated with local wildfire and enhanced coarse sediment input, indicating a significant environmental change during the NRB interval. Similar paleoclimatic perturbations have been noted across other extinction events (e.g., end-Permian mass extinction event) as a result of the emplacement of large igneous provinces, or because of felsic volcanism.
登录
查看更多内容
影响因子：
5.2
作者：
Hammes, Karen;Schmidt, Michael W. I.;Ding, Luyi
通讯作者：
Ding, Luyi
DOI：
10.1130/0-8137-2352-3.247
发表时间：
2001
期刊：
--
影响因子：
--
作者：
R. Ernst;K. Buchan
通讯作者：
R. Ernst;K. Buchan
卡尼期洪积期（晚三叠世）整个特提斯浅水碳酸盐产量的同步变化
影响因子：
3.9
作者：
Xin Jin;Piero Gianolla;Zhiqiang Shi;Marco Franceschi;Marcello Caggiati;Yixing Du;Nereo Preto
通讯作者：
Nereo Preto
影响因子：
3.9
作者：
Honami Sato;A. Ishikawa;T. Onoue;Y. Tomimatsu;M. Rigo
通讯作者：
Honami Sato;A. Ishikawa;T. Onoue;Y. Tomimatsu;M. Rigo
影响因子：
2.2
作者：
M. Rigo;H. Campbell
通讯作者：
M. Rigo;H. Campbell