华南上扬子地台寒武系-妙岭间系高分辨率碳同位素地层学：全球对比意义

IF 2.7 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2025-08-18 DOI:10.1016/j.palaeo.2025.113213

Huachuan Jiang , Jintong Liang , Karem Azmy , Yan Wei , Lian Duan , Hao Zhang , Taiyuan Fan , Jian Xu , Wei Zheng , Huaguo Wen

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引用次数: 0

摘要

Redlichiid-Olenellid灭绝碳同位素偏移（ROECE）和Drumian碳同位素偏移（DICE）代表了下至中寒武统两次明显的负碳同位素偏移事件，分别被认为是识别寒武统-五流期边界和Drumian期基底的关键化学地层学标志。然而，ROECE和DICE的精确局部和全球相关性仍未得到解决，其大小的异质性也存在争议。本文报道了华南上扬子地台张飞前剖面、十流剖面和七辽剖面的高分辨率δ13Ccarb剖面，该剖面横跨寒武纪-江山期。石龙洞组、高台组、西相池组以灰质泥岩和白云岩为主，间或与薄层泥岩或砂质白云岩互层交替。通过岩石学和地球化学的多重筛选技术，对所研究的碳酸盐的保存情况进行了细致的评估。δ13Ccarb值（- 0.5±1.2‰VPDB）与δ18Ocarb值（- 8.8±1.6‰VPDB, R2 = 0.01）和Mn/Sr比值（R2 = 0.18）的相关性不显著，这表明至少保存了近初级δ13C特征，可用于构建可靠的高分辨率δ13C剖面，用于全球相关性。δ13Ccarb剖面主要表现为两次负偏移，下偏移（~ 6.0‰）几乎发生在高台组中段，上偏移（~ 3.2‰）发生在西乡池组中段。三叶虫生物分带方案支持了低偏移与ROECE和高偏移与DICE事件的相关性，这些事件在全球不同的古大陆上都有记录。结合前人的研究成果，建立了扬子地台寒武系连续高分辨率δ13Ccarb剖面，用于全球化学地层对比。

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High-resolution carbon-isotope stratigraphy of the Cambrian Series 2–Miaolingian Series in Upper Yangtze Platform, South China: Implications for global correlation

The Redlichiid-Olenellid extinction carbon-isotope excursion (ROECE) and Drumian carbon-isotope excursion (DICE) represent two pronounced negative C-isotope excursion events in the lower to middle Cambrian and have been proposed as key chemostratigraphic markers for identifying the Cambrian Stage 4–Wuliuian Stage boundary and the base of the Drumian Stage, respectively. However, the precise local and global correlations of the ROECE and DICE remain unsolved, and the heterogeneity of their magnitudes is controversial. In the current study, we report a new high-resolution δ¹³C_carb profile from the Zhangfeiqian (ZFQ), Shiliu (SL), and Qiliao (QL) sections in the Upper Yangtze Platform (South China) that spans the Cambrian Stage 4-Jiangshanian Stage. The investigated Shilongdong, Gaotai, and Xixiangchi formations are dominated by lime mudstone and dolomicrite, occasionally alternating with thinly-bedded mudstone or sandy dolomite interbeds. The preservation of the investigated carbonates was meticulously evaluated by multi-screening petrographic and geochemical techniques. The δ¹³C_carb values (−0.5 ± 1.2 ‰ VPDB) exhibit an insignificant correlation with their δ¹⁸O_carb (−8.8 ± 1.6 ‰ VPDB, R² = 0.01) and Mn/Sr ratios (R² = 0.18), which supports the preservation of at least near-primary δ¹³C signatures that can be utilized to construct a reliable high-resolution δ¹³C profile for global correlations. The δ¹³C_carb profile shows two main negative excursions, the lower excursion (∼ 6.0 ‰) almost at the middle part of the Gaotai Formation and the upper excursion (∼ 3.2 ‰) at the lower part of the Xixiangchi Formation. The trilobite biozonation scheme supports the correlation of the lower excursion with the ROECE and the upper excursion with the DICE events, which have been globally documented on different paleocontinents. Combined with previous studies, we provide a continuous high-resolution δ¹³C_carb profile of the Cambrian in the Yangtze Platform for global chemostratigraphic correlations.

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来源期刊

Palaeogeography, Palaeoclimatology, Palaeoecology 地学-地球科学综合

CiteScore

5.90

自引率

10.00%

发文量

398

审稿时长

3.8 months

期刊介绍： Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.