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首页> 外文期刊>Geological Society of America Bulletin >Cyclostratigraphic calibration of the Frasnian (Late Devonian) time scale (western Alberta, Canada)
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Cyclostratigraphic calibration of the Frasnian (Late Devonian) time scale (western Alberta, Canada)

机译：Frasnian（晚泥盆世）时标的旋回地层校准（加拿大艾伯塔省西部）

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摘要

Until now, the duration of the Frasnian Stage has remained very poorly constrained, hampering a detailed understanding of sedimentation processes and environmental and evolutionary change. In this study, time-series analyses of high-resolution (10-20 k.y.) magnetic susceptibihty data identify sixteen 405 k.y. eccentricity cycles in the magnetic susceptibihty stratigraphy of the Frasnian (Late Devonian), derived from carbonate-platform and surrounding slope and basin deposits in western Alberta, Canada. Previous studies demonstrated the generally consistent pattern of magnetic susceptibihty change across the Alberta basin and thus demonstrated the utility of magnetic susceptibility stratigraphy as a refined regional correlation tool compared to biostratigraphy. In the present study, we show that the magnetic susceptibility stratigraphy of the Frasnian interval in western Alberta has been significantly influenced by astronomical forcing. Using the sixteen 405 k.y. eccentricity cycles as a geochronometer, we constructed a Frasnian astronomical time scale. This time scale indicates a duration of 6.5 ± 0.4 m.y. for the Frasnian. Calibrating this duration to the best available Devonian chronology, the absolute age of the Givetian-Frasnian boundary is recalculated to 383.6 ± 3.0 Ma, and the age of the Frasnian-Famennian boundary is recalculated to 376.7 ± 3.0 Ma. These new absolute ages take into account the astronomically derived duration of the Frasnian, but they also yield a narrowing of the error margins of the absolute ages by several hundreds of thousands of years.
机译：到现在为止，弗拉斯尼期的持续时间仍然受到非常有限的约束，妨碍了对沉积过程以及环境和演化变化的详细了解。在这项研究中，高分辨率（10-20 k.y.）磁化率数据的时间序列分析确定了16 405k.y。来自加拿大阿尔伯塔省西部的碳酸盐岩台地及周围斜坡和盆地沉积物的弗拉斯尼（晚期泥盆纪）磁化地层中的偏心周期。先前的研究表明，艾伯塔盆地的磁化率变化总体上是一致的，因此与生物地层学相比，磁化率地层学可作为精细的区域相关工具。在本研究中，我们表明，天文强迫对阿尔伯塔省西部Frasnian层的磁化率地层影响很大。使用16 405公里偏心轮作为地球精密计时器，我们构造了一个弗拉斯尼亚天文时标。此时间范围表示持续时间6.5±0.4m.y。为弗拉斯尼亚人。将这段持续时间校准为最佳的泥盆纪年代，将吉田-弗兰斯尼边界的绝对年龄重新计算为383.6±3.0 Ma，将弗拉斯尼-法门尼边界的年龄重新计算为376.7±3.0 Ma。这些新的绝对年龄考虑了Frasnian的天文学得出的持续时间，但也使绝对年龄的误差范围缩小了数十万年。

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