Hangenberg事件晚期海相Sr同位素组成的牙形石磷灰石记录

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2025-07-23 DOI:10.1016/j.chemgeo.2025.122981

Thomas Letulle , Przemysław Lech Świś , Federico Lugli , Annalisa Ferretti , Manuel Rigo

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引用次数: 0

摘要

泥盆纪-石炭系界线是显生宙海洋放射性成因锶曲线的主要裂缝之一。由于同位素锶地层学可以提供一种辅助的对比工具，因此在重新定义泥盆纪/石炭纪界线的讨论中，这一差距尤其令人感兴趣。本文介绍了从波兰中部科瓦拉采石场剖面收集的三组牙形石元素的最新法门纪放射性成因Sr数据。牙形石数据的最小变化，加上与同期发表的腕足动物数据的良好拟合，使这一记录具有很高的可靠性。Kowala Quarry材料提供了Hangenberg事件前数百万年的海水87Sr/86Sr比值趋势。从Bispathodus costatus（~ 0.70832±0.00003）到Siphonodella (Eosiphodella) praesulcata带（0.70822±0.00003）的87Sr/86Sr比值下降趋势表明早石炭世的下降趋势早在晚famenian就开始了。与早法明世趋势对比表明，海水87Sr/86Sr比值在法明世晚期和中期达到最大值。我们试图将这个新数据集与GTS 2020联系起来，并基于现有的生物地层学、放射学和天体年代学数据讨论两种不同的年龄模型。两种年龄模型均表明，在s (e) praesulcata带87Sr/86Sr比值下降速率较高。我们使用海洋sr的一维质量平衡模拟来探讨这种减少趋势的原因。模拟实验拒绝了同时期的科拉-第聂伯河大火成岩省位进是87Sr/86Sr位移的主要驱动因素的假设。更可能的解释是全球海洋锶的持续不平衡，其中可能包括造山带的减弱、火山弧活动和增生的增加、热液作用的增加以及LIP侵位的小贡献。

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Conodont apatite record of marine Sr isotopic composition in the advent of the Hangenberg Event (Late Devonian)

The Devonian-Carboniferous boundary constitutes one of the major gaps of the Phanerozoic oceanic radiogenic Sr curve. This gap is of particular interest in the ongoing discussion to redefine the Devonian/Carboniferous boundary, as isotopic Sr stratigraphy could provide an auxiliary correlation tool. We present herein the first latest Famennian radiogenic Sr data from three monogeneric sets of conodont elements collected from the well-studied Kowala Quarry section in central Poland. The minimal alteration of this conodont dataset, supported by the good fit with published brachiopod data from coeval intervals, makes this record highly reliable. The Kowala Quarry material provides updated seawater ⁸⁷Sr/⁸⁶Sr ratio trend along the few million years preceding the Hangenberg Event. The decreasing ⁸⁷Sr/⁸⁶Sr ratios trend from the Bispathodus costatus (∼ 0.70832 ± 0.00003) to the Siphonodella (Eosiphodella) praesulcata Zone (0.70822 ± 0.00003) suggest the early Carboniferous decreasing trend started as early as the late Fammenian. Comparison with early Fammenian trends indicate seawater ⁸⁷Sr/⁸⁶Sr ratio reached a maximum during the late or middle Famennian. We attempt to correlate this new dataset to the GTS 2020 and discuss two different age models based on available biostratigraphic, radiometric and astrochronological data. Both age models suggest higher rates of ⁸⁷Sr/⁸⁶Sr ratio decrease during the S. (E.) praesulcata Zone. We explore the cause of this decreasing trends using one-dimensional mass balance modelling of oceanic Sr. The modelling experiments reject the hypothesis of the coeval Kola-Dniepr Large Igneous Province emplacement as the main driver of this ⁸⁷Sr/⁸⁶Sr shift. It is more likely explained by a global and sustained imbalance of oceanic Sr, which may include a combination of orogenic belt waning, increased volcanic arc activity and accretion, increased hydrothermalism, as well as a small contribution of LIP emplacement.

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.