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| DOI | 10.1016/j.jseaes.2024.106033 |
| Orbital cycles recorded in Early Cambrian shales with implications for organic matter accumulation | |
| 发表日期 | 2024 |
| ISSN | 1367-9120 |
| EISSN | 1878-5786 |
| 起始页码 | 263 |
| 卷号 | 263 |
| 英文摘要 | The Qiongzhusi Formation, dating back to the Early Cambrian period and located in the Yangtze Block of the South China Craton, is distinguished by its organic -rich shales. These shales, which developed during the pivotal Second Cambrian Explosion have increasingly become a focal point of scholarly research. Previous studies have identified a stratigraphic transition in Qiongzhusi Formation, signaling a major shift in the Early Cambrian ocean -climate system. While existing geochemical analyses have shed light on primary productivity and redox conditions, the impact of orbital -forcing on organic matter accumulation remains poorly understood. This study reports on the results of iron to aluminum ratio (Fe/Al) and total organic carbon (TOC) assessments conducted on Early Cambrian shale samples from drill hole JS103 in the Sichuan Basin. The analysis spans approximately 10.8 million years, covering Stages 2-3 (from -526 Ma to -515 Ma), and is based on data derived from astronomical tuning. Our findings reveal hierarchal periodicities corresponding to 405, -100 and -36-kyr cycles. Notably, the observed phase shifts in the 405-kyr filtered Fe/Al and TOC data series around -521 Ma indicate potential orbitally driven variations in carbon cycling, possibly influencing monsoon dynamics. Higher Fe/Al ratios indicate enhanced preservation under anoxia environmental conditions, while low ratios alongside high TOC suggest increased productivity due to nutrient influx. The phase shifts observed in the coupled series on a 405-kyr cycle scale imply a significant transformation of the ocean -climate system, driven by strong eccentricity pacing during the second Cambrian explosion. This suggests that Cambrian biotic radiation could have been influenced by astronomical forcing and variations in oceanic oxygen levels. |
| 英文关键词 | Orbital timescale; Eccentricity pacing; Shales; Astronomical calculations; Bio-evolution |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:001176465800001 |
| 来源期刊 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/299124 |
| 作者单位 | Chengdu University of Technology; Chengdu University of Technology; Chengdu University of Technology; Sinopec |
| 推荐引用方式 GB/T 7714 | . Orbital cycles recorded in Early Cambrian shales with implications for organic matter accumulation[J],2024,263. |
| APA | (2024).Orbital cycles recorded in Early Cambrian shales with implications for organic matter accumulation.JOURNAL OF ASIAN EARTH SCIENCES,263. |
| MLA | "Orbital cycles recorded in Early Cambrian shales with implications for organic matter accumulation".JOURNAL OF ASIAN EARTH SCIENCES 263(2024). |
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