Rhuddanian to Aeronian (Llandovery, early Silurian) carbon isotope stratigraphy throughout carbonate sequences in the upper Yangtze region, South China block

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Island Arc Pub Date : 2024-01-23 DOI:10.1111/iar.12512
Shenyang Yu, Qijian Li, Stephen Kershaw, Axel Munnecke, Yingyan Mao, Yue Li
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Abstract

The Xiangshuyuan Formation (middle Rhuddanian to middle Aeronian stages of the Llandovery Series, lower Silurian) records a shelly fauna representing recovery after the end-Ordovician mass extinction in a well-oxygenated shallow carbonate platform of the Upper Yangtze region, South China Block. Carbon isotope stratigraphy is documented from limestone sequences of the formation at the Qiankou section, northeast Guizhou. The early Aeronian carbon isotope excursion (EACIE, with an amplitude of about 2 ‰ and peak value of 2.44 ‰) is identified in the middle and upper parts of the formation (Ozarkodina obesa conodont Biozone). The EACIE recorded herein correlates well with those in Baltica, Canada, and the United States; together with its records from organic material (δ13Corg) the data verify that the EACIE is a global event. The beginning of the EACIE can be used as a chemostratigraphic marker defining the Rhuddanian/Aeronian boundary in strata that lack high-resolution biostratigraphic constraints.

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华南区块长江上游地区整个碳酸盐岩层序的红垩纪至阿龙纪(兰德发现期,志留纪早期)碳同位素地层学
湘水源地层(兰德发现系中段至阿龙纪中段,志留系下统)记录了华南地块上长江地区一个含氧良好的浅层碳酸盐岩平台中代表奥陶纪末大灭绝后复苏的搁浅动物群。碳同位素地层学资料来自贵州东北部黔口段的石灰岩层序。在该地层的中上部(Ozarkodina obesa conodont Biozone)发现了早阿隆纪碳同位素偏移(EACIE,振幅约为2‰,峰值为2.44‰)。这里记录的 EACIE 与波罗的海、加拿大和美国的 EACIE 有很好的相关性;加上有机物质(δ13Corg)的记录,这些数据验证了 EACIE 是一个全球性事件。在缺乏高分辨率生物地层学约束的地层中,EACIE 的开端可作为界定 Rhuddanian/Aeronian 边界的化合地层学标志。
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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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