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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Astronomically forced climate change in the late Cambrian
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Astronomically forced climate change in the late Cambrian

机译：寒武纪晚期天文迫使气候变化

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We report evidence for Milankovitch cycles in two drill cores from the Cambro-Ordovician Alum Shale Formation of Scandinavia. The signal is preserved in elemental abundances recorded at high stratigraphic resolution by core scanning XRF analysis (0.2 mm resolution). The new data enable us to establish a floating timeline calibrated to the stable 405 kyr eccentricity cycle for a similar to 8.7 Myr interval across the Miaolingian-Furongian boundary. This interval spans the Steptoean Positive Carbon Isotope Excursion (SPICE), which is recorded in the delta C-13(org) in the studied drill cores. We calculate the durations of the Olenus Superzone to 3.4 +/- 0.2 Myr, the Parabolina Superzone to 1.9 +/- 0.3 Myr, the Leptoplastus Superzone to 0.33 +/- 0.18 Myr, the Protopeltura Superzone to 0.51 +/- 0.20 Myr, and the SPICE event straddling the Paibian and lower main part of the Jiangshanian Stage to 3.0 +/- 0.2 Myr. The sedimentation rate shows similar trends at both drilling locations and is inversely correlated to eustatic sea level changes in certain time intervals, opening tantalizing new prospects of using cyclostratigraphic analyses of shales to track eustatic sea level variations. The identification of obliquity cycles enables us to calculate the Cambrian Earth-Moon distance as well as the day length at similar to 493 Ma to 368.9 +/- 2.3. 10(6) m and 21.78 +/- 0.29 hr, respectively. (C) 2020 Elsevier B.V. All rights reserved.
机译：我们报告的证据对来自斯堪的纳维亚的寒武 - 奥陶系明矾页岩地层两钻芯米兰科维奇周期。信号在记录在由核心扫描XRF分析（0.2 mm的分辨率）高地层分辨率元素丰度被保留。新的数据使我们能够建立校准，以稳定405 KYR偏心周期类似的跨越Miaolingian，芙蓉边界8.7秘耳区间浮动时间表。此间隔跨度Steptoean正碳同位素游览（SPICE），它被记录在所研究的岩心的ΔC-13（ORG）。我们计算Olenus Superzone的持续时间以3.4 +/- 0.2秘耳，所述Parabolina Superzone至1.9 +/- 0.3秘耳，所述Leptoplastus Superzone到0.33 +/- 0.18秘耳，所述Protopeltura Superzone到0.51 +/- 0.20秘耳，和的SPICE事件横跨Paibian和Jiangshanian阶段至3.0 +/- 0.2秘耳下主体部分。在两个钻井位置的沉降率示出了类似的趋势和呈负相关，以一定的时间间隔海平面升降变化，打开诱人使用页岩cyclostratigraphic分析来跟踪海平面升降变化的新的前景。倾角周期的识别，使我们能够计算出368.9±2.3以类似于493马寒武纪地月距离以及一天长度。 10（6）m和21.78 +/- 0.29小时，分别。 （c）2020 Elsevier B.v.保留所有权利。

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