早期海相胶结物对埃迪卡拉纪-寒武纪海水化学演化的记录

IF 1.9 3区 地球科学 Q1 GEOLOGY
Yi Xiong, Rachel Wood, Laetitia Pichevin
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引用次数: 1

摘要

埃迪卡拉纪-寒武纪的辐射标志着后生动物和钙质生物矿化坚硬部分的广泛出现。这些创新发生在海洋氧化还原和海水化学的动态变化期间。在这里,记录了碳酸盐矿物学、Mg/Ca比率和稀土元素浓度的变化,包括铈的相对丰度(Ce异常:Ceanom),以跟踪寒武纪2-4期浅海珊瑚礁中保存完好的早期海洋胶结物中的海水氧水平(约525–512 马)。首先,将矿物学数据与已发表的记录相结合,推断出主要碳酸盐矿物学的几个变化:埃迪卡拉纪晚期的“白云石-霰石海”寒武纪2期的霰石/高镁方解石海;在寒武纪早期第3阶段,暂时转变为“方解石海”;晚寒武纪第3阶段至晚寒武纪第4阶段之间的“霰石海”,然后从中上寒武纪的混合“霰石-方解石海”逐渐转变为早奥陶世的“方解石海”。其次,根据测量的早期海洋水泥中的mMg/Ca,计算的15°C和35°C下的海水mMg/Ca在寒武纪第2阶段的范围分别为1.2至0.8,第3阶段为0.7至0.4,第4阶段为1.4至0.9。最后,分析的Ceanom数据与现有Ceanom的数据相结合,表明全球毒性扩张可能有三个阶段。首先,在埃迪卡拉纪晚期至Fortunian(约550–540年 马;平均Ceanom为0.99至0.41),可能在寒武纪早期的第3阶段有两个较短的阶段(约519 马;平均Ceanom为0.91至0.40)和第4阶段(约512 马;平均Ceanom为1.02至0.49),以更显性缺氧的间隔为界。总之,这些数据表明,通过地球进化的这一关键转变,早期海洋胶结物为浅海氧化还原和海水化学提供了一个未充分利用的高分辨率档案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The record of sea water chemistry evolution during the Ediacaran–Cambrian from early marine cements

The record of sea water chemistry evolution during the Ediacaran–Cambrian from early marine cements

The Ediacaran–Cambrian Radiation marks the widespread appearance of metazoans and calcareous biomineralised hard parts. These innovations occurred during an interval of dynamic changes in marine redox and sea water chemistry. Here, changing carbonate mineralogy, Mg/Ca ratios and rare earth element concentrations including the relative abundance of cerium (Ce anomaly: Ceanom) are documented to track sea water oxygen levels, in well-preserved early marine cements from shallow marine reefs from Cambrian Stages 2–4 (ca 525–512 Ma). First, integrating the mineralogical data with published records, several shifts in dominant carbonate mineralogy are inferred: ‘dolomite-aragonite seas’ in the late Ediacaran; ‘aragonite/high-Mg calcite seas’ in Cambrian Stage 2; a temporary shift to a ‘calcite sea’ during early Cambrian Stage 3; an ‘aragonite sea’ between late Cambrian Stage 3 and late Cambrian Stage 4, then a gradual shift from mixed ‘aragonite–calcite seas’ during the middle and upper Cambrian towards a ‘calcite sea’ by the early Ordovician. Second, based on measured mMg/Ca in early marine cements, calculated sea water mMg/Ca at 15 and 35°C ranges from 1.2 to 0.8 in Cambrian Stage 2, 0.7–0.4 in Stage 3 and 1.4–0.9 in Stage 4 respectively. Finally, analysed Ceanom data combined with existing Ceanom data suggest potentially three phases of global oxic expansion. First, a long-lived phase of progressive oxygenation during the late Ediacaran to Fortunian (ca 550–540 Ma; average Ceanom from 0.99 to 0.41), and possibly two shorter phases during early Cambrian Stage 3 (ca 519 Ma; average Ceanom from 0.91 to 0.40) and Stage 4 (ca 512 Ma; average Ceanom from 1.02 to 0.49), bounded by intervals of more dominant anoxia. Summarising, these data demonstrate that early marine cements offer an underused and high-resolution archive of shallow marine redox and sea water chemistry through this critical transition in Earth's evolution.

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CiteScore
4.10
自引率
16.70%
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42
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