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Chemostratigraphy of the Mesoproterozoic Shennongjia Group, Yangtze Craton (South China): Implications for oxidized shallow seawaters

机译：中索古代神农集团的化学读物图，长江（华南）：对氧化浅海洋浇水的影响

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摘要

The relatively low Mesoproterozoic oxygen concentrations in atmospheric and marine environments remained controversial because the marine chemical evolution has not been sufficiently researched. To provide a better understanding of the secular redox conditions of shallow-water sedimentary environments and to perform global isotopic comparisons, we present new data of rare earth elements and yttrium (REE + Y), redox-sensitive elements (RSEs), and carbonate carbon-oxygen isotopes from Mesoproterozoic marine succession in the Shennongjia Group of the Yangtze Shennongjia area. Seawater-like REE + Y distribution patterns with significantly negative Ce anomalies, which had previously been screened to avoid detrital effects in the leached carbonates, illustrate the oxidation of shallow seawaters during the deposition of this group. Although the Ce/Ce* and (Pr/Yb)(SN) values remain relatively low in carbonate samples throughout the Mesoproterozoic, these values are higher than those of the modern oxygenated ocean, indicating less intense oxygenation. This conclusion is supported by the high enrichment factors of the RSEs in screened samples resulting from a considerable marine reservoir for dissolved RSEs in a constantly oxidized environment. Under these circumstances, the delta C-13(carb) chemostratigraphy is moderately varied, with values near +3.5 parts per thousand and lower than +5 parts per thousand, and more dynamic variability is observed over time, which is related to progressively smaller marine dissolved inorganic carbon (DIC) reservoirs. In addition, the significant negative excursion of delta C-13(carb) near to or less than 0 parts per thousand in this lower subgroup is globally matched in different blocks and may correspond to the oxidation of isotopically light organic matter in oceans. A worldwide comparison indicates that the delta C-13(carb) chemostratigraphies combined with limited geochronological data may constrain this extended negative excursion to ca. 1.3-1.2 Ga and the Shennongjia Group to ca. 1.3-1.1 Ga.
机译：大气和海洋环境中相对低的中环佐色氧浓度保持争议，因为海洋化学进化没有得到充分研究。为了更好地了解浅水沉积环境的世俗氧化还原条件并进行全局同位素比较，我们呈现了稀土元素和钇（REE + Y），氧化还原元素（RSES）和碳酸碳碳的新数据扬子市神农鸡群中的中间蛋白古世纪海洋继承的氧化索同位素。海水的Ree + Y分布模式具有显着的负CE异常，先前已经筛选以避免在浸出的碳酸盐中脱滴效应，说明了在该组沉积期间浅海水处的氧化。虽然CE / Ce *和（Pr / Yb）（Sn）值在碳酸盐样品中保持相对较低，但这些值高于现代含氧海洋的值，表明较小的氧合。该结论是由筛选样品中的RSES的高浓缩因子支持，该样品由溶解的RSES在不断氧化环境中的溶解RSES中产生的。在这种情况下，Delta C-13（Carb）化学疗效适度变化，值接近+ 3.5分别，低于+ 5份，随着时间的推移，观察到的+ 5份，而且具有更多的动态变异，这与逐步更小的海洋有关溶解无机碳（DIC）储层。此外，在该较低亚组中近乎或少于0次左右的ΔC-13（CARB）的显着负偏移在不同的块中全球匹配，并且可以对应于海洋中同位素轻有机物的氧化。全球比较表明，Delta C-13（CARB）化疗与有限的地质纪情况数据组合可以将这种延长的负偏移约束到CA. 1.3-1.2 GA和Shennongjia Group到CA。 1.3-1.1 GA。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第1期|399-415|共17页
  • 作者

    Zou Yu; Liu Dongna; Zhao Fenghua; Kuang Hongwei; Sun Yuxiang; Cheng Jianbo;

  • 作者单位

    China Univ Min & Technol Coll Geosci & Surveying Engn Beijing 100083 Peoples R China;

    China Univ Min & Technol Coll Geosci & Surveying Engn Beijing 100083 Peoples R China|Taiyuan Univ Technol Coll Min Engn Taiyuan 030024 Shanxi Peoples R China;

    China Univ Min & Technol Coll Geosci & Surveying Engn Beijing 100083 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Beijing 100083 Peoples R China;

    China Univ Min & Technol Coll Geosci & Surveying Engn Beijing 100083 Peoples R China;

    China Univ Geosci Sch Earth Sci & Resources Beijing 100083 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Shennongjia Group; Yangtze Craton; Chemostratigraphy; Oxidized conditions;

    机译：神农集团;长江克拉顿;Chemostraphy;氧化条件;

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