美国犹他州中寒武纪(约 500 Ma)Marjum 地层中受 Milankovitch 迫力调节的千年尺度气候循环

Geology Pub Date : 2024-05-17 DOI:10.1130/g52182.1
Damien Pas, Maya Elrick, A. Da Silva, Linda Hinnov, Valentin Jamart, Marion Thaureau, Michiel Arts
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摘要

美国犹他州马朱姆地层中寒武纪近海沉积的特征是由不同的细硅质岩与石灰岩丰度所定义的四种规模的叠加周期性;这些周期性包括石灰岩-泥灰岩对生(韵律岩;5-10 厘米),它们被捆绑成准序列(1-2 米)以及小规模(5-10 米)和大规模(20-40 米)序列。对二氧化硅和岩性等级地层序列的时间序列分析表明,这些周期与对应于寒武纪轨道偏心(20 米,405 千年;∼6 米,110 千年)、偏斜(1.8 米,30 千年)、气候前倾(1.15 米,∼18 千年)和半前倾(0.64 米,7 千年)的米兰科维奇周期一致。岩性等级序列的天文校准表明,0.065 米处的主要次米兰科维奇周期代表 1 k.y.,与基本节律岩对偶相对应。所有尺度的周期都被解释为湿润与干燥季风气候振荡的结果,控制着流入盆地的细硅质沉积物的丰度。一个可信的千年尺度气候驱动因素是太阳活动。这些结果描述了太阳影响的气候变化受 Milankovitch 迫力调节的最古老的地质候选现象之一。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Millennial-scale climate cycles modulated by Milankovitch forcing in the middle Cambrian (ca. 500 Ma) Marjum Formation, Utah, USA
Middle Cambrian offshore deposits of the Marjum Formation, Utah, USA, are characterized by four scales of superimposed cyclicity defined by varying fine siliciclastic versus limestone abundances; these include limestone-marl couplets (rhythmites; 5−10 cm), which are bundled into parasequences (1−2 m) and small-scale (5−10 m) and large-scale (20−40 m) sequences. Time series analysis of SiO2 and lithologic rank stratigraphic series reveal cycles consistent with Milankovitch periods corresponding to Cambrian orbital eccentricity (20 m, 405 k.y.; ∼6 m 110 k.y.), obliquity (1.8 m, 30 k.y.), climatic precession (1.15 m, ∼18 k.y.), and half-precession (0.64 m, 7 k.y.). Astronomical calibration of the lithologic rank series indicates that the main sub-Milankovitch cycle at 0.065 m represents ∼1 k.y. and corresponds to the basic rhythmite couplet. All scales of cyclicity are interpreted as the result of wet versus dry monsoonal climate oscillations controlling the abundance of fine siliciclastic sediment influx to the basin. A plausible millennial-scale climate driver is solar activity. These results describe one of the oldest known geological candidates for solar-influenced climate change modulated by Milankovitch forcing.
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