The Neoproterozoic era is a time of major environmental change in Earth history. The Ediacaran period (635–541 Ma), the uppermost division of Precambrian time, is characterized by the remarkable Shuram excursion (largest C isotope negative excursion), a deep ocean water oxidation event, and Ediacaran biota. The Nafun Group of Oman provides a well-preserved and mostly continuous section of an Ediacaran succession. Based on geochemical data from the Nafun Group, the Shuram excursion (SE) and deep ocean oxidation hypotheses were proposed. Now, we sampled this section at high stratigraphic resolution, and present here the petrographical and geochemical analysis of the Khufai, Shuram and Buah Formations. The major and trace element analysis of shales from the Shuram Formation indicates that northern Oman was an active continental margin environment in Neoproterozoic times. The provenance of the Shuram Formation was primarily mafic and intermediate igneous rocks. With the unsteady tectonic setting, the development of the Nafun Group was influenced by hydrothermal supply and volcaniclastic input. Based on the V/Cr and U/Th ratio of the samples from the Nafun Group, our study reveals the transition of the ocean water redox environment, which is connected to the rise and fall of the Ediacaran biota. Our study constrains the tectonic setting of northern Oman and the petrography and geochemical data from the Nafun Group for the hydrothermal and volcaniclastic supply. Thus, our study acknowledges more factors for the explanation of the Ediacaran conundrums.

中文翻译：

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受活跃大陆边缘影响的阿曼新元古代纳丰群沉积物

新元古代时代是地球历史上环境发生重大变化的时期。Ediacaran时期（635-541 Ma）是前寒武纪时间的最高分部，其特征是显着的Shuram偏移（最大的C同位素负偏移），深水氧化事件和Ediacaran生物区系。阿曼纳丰集团（Nafun Group）提供了保存完好的Ediacaran演替段，且大部分为连续段。根据纳富集团的地球化学数据，提出了舒兰姆偏移（SE）和深海氧化假说。现在，我们以较高的地层分辨率对这一部分进行了采样，并在此介绍了胡法伊，舒兰姆和布阿地层的岩石学和地球化学分析。Shuram组页岩的主要和微量元素分析表明，阿曼北部是新元古代的活跃大陆边缘环境。Shuram组的物源主要是镁铁质和中间的火成岩。由于构造环境不稳定，Nafun组的发展受到热液供应和火山碎屑输入的影响。根据Nafun组样本的V / Cr和U / Th比，我们的研究揭示了海水氧化还原环境的转变，这与Ediacaran生物群的兴衰有关。我们的研究限制了阿曼北部的构造环境以及纳富集团为热液和火山碎屑供应的岩相学和地球化学数据。从而，