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首页> 外文期刊>Geoscience frontiers >Periodicities in the emplacement of large igneous provinces through the Phanerozoic: Relations to ocean chemistry and marine biodiversity evolution
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Periodicities in the emplacement of large igneous provinces through the Phanerozoic: Relations to ocean chemistry and marine biodiversity evolution

机译：大火成岩进入大火成岩省的周期性：与海洋化学和海洋生物多样性演变的关系

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Large igneous provinces (LIPs) are considered a relevant cause for mass extinctions of marine life throughout Earth’s history. Their flood basalts and associated intrusions can cause significant release of SO 4 and CO 2 and consequently, cause major environmental disruptions. Here, we reconstruct the long-term periodic pattern of LIP emplacement and its impact on ocean chemistry and biodiversity from δ 34 S sulfate of the last 520 Ma under particular consideration of the preservation limits of LIP records. A combination of cross-wavelet and other time-series analysis methods has been applied to quantify a potential chain of linkage between LIP emplacement periodicity, geochemical changes and the Phanerozoic marine genera record. We suggest a mantle plume cyclicity represented by LIP volumes ( V ) of V =?(350–770)×10 3 km 3 sin(2 πt /170Ma)+(300–650)×10 3 km 3 sin(2 πt /64.5Ma+2.3) for t =time in Ma. A shift from the 64.5Ma to a weaker ～28–35Ma LIP cyclicity during the Jurassic contributes together with probably independent changes in the marine sulfur cycle to less ocean anoxia, and a general stabilization of ocean chemistry and increasing marine biodiversity throughout the last ～135Ma. The LIP cycle pattern is coherent with marine biodiversity fluctuations corresponding to a reduction of marine biodiversity of ～120genera/Ma at ～600×10 3 km 3 LIP eruption volume. The 62–65Ma LIP cycle pattern as well as excursion in δ 34 S sulfate and marine genera reduction suggest a not-yet identified found LIP event at ～440–450Ma. Graphical abstract Display Omitted Highlights ? 140 and 65Ma cyclic eruptions of large igneous provinces (LIPs) control ocean chemistry and marine biodiversity. ? Since ～135Ma, a ～32Ma cyclicity became dominated in LIP and marine biodiversity records. ? Cycle amplitudes relate to reduction of ～120 marine genera at >～600×10 3 km 3 LIP eruption volume.
机译：火成岩大省（LIP）被认为是整个地球历史上海洋生物大规模灭绝的重要原因。它们的洪水玄武岩和相关的侵入物可能导致SO 4和CO 2大量释放，从而导致严重的环境破坏。在这里，我们特别考虑到LIP记录的保存限制，从最后520 Ma的δ34 S硫酸盐中重建LIP的长期长期分布格局及其对海洋化学和生物多样性的影响。交叉小波分析和其他时间序列分析方法的结合已被用于量化LIP进位周期，地球化学变化与生代海洋属记录之间的潜在联系链。我们建议以LIP体积（V）为V =？（350–770）×10 3 km 3 sin（2πt/ 170Ma）+（300–650）×10 3 km 3 sin（2πt/ 64.5Ma + 2.3），t =时间以Ma为单位。在侏罗纪期间，LIP周期从64.5Ma转变为较弱的〜28-35Ma，这与可能是海洋硫循环的独立变化共同作用，从而减少了海洋缺氧，并在最后一个135Ma期间使海洋化学基本稳定并增加了海洋生物多样性。 。 LIP周期模式与海洋生物多样性波动相一致，对应于在600×10 3 km 3 LIP喷发量下〜120genera / Ma的海洋生物多样性减少。 62-65Ma的LIP循环模式以及δ34 S硫酸盐的偏移和海洋属的减少表明，尚未发现在440-450Ma处发现的LIP事件。图形摘要显示省略的突出显示？大火成岩省（LIP）的140和65Ma周期性喷发控制着海洋化学和海洋生物多样性。 ？自〜135Ma以来，LIP和海洋生物多样性记录中以〜32Ma为周期。 ？周期振幅与>〜600×10 3 km 3 LIP喷发量时〜120海洋属的减少有关。

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