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首页> 外文期刊>Journal of Remote Sensing & GIS >Spectral Analysis of a Core from the Sebkha of Sidi Mansour, Southern Tunisia: The Holocene Cyclostratigraphy
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Spectral Analysis of a Core from the Sebkha of Sidi Mansour, Southern Tunisia: The Holocene Cyclostratigraphy

机译：突尼斯南部西迪·曼苏尔（Sidi Mansour）Sebkha岩心的光谱分析：全新世旋回地层

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The Milancovitch Theory explaining the ancient cyclostratigraphy does not file a case for the Holocene cyclostratigraphy. Instead, other astronomical and oceanographic mechanisms control the cyclicity within Holocene sediment. This work aimed to find out the climatic cyclicity along a core from the sebkha of Sidi Mansour located along the Mediterranean coast in Tunisia, through using different proxies: the magnetic susceptibility, carbonate percentages and chemical elements (Ca, Na, and K). Based on previous radiocarbon and tephrochrnological dating in the study area, the core was estimated to cover the two last millennia with a sedimentation rate of 0.35 mm/yr. This rate allows the elaboration of a depth-age model to carry the spectral analysis. Not all the proxies visualize the same climatic cycles. For instance, the spectral analysis of the magnetic susceptibility and Sodium data visualized a 1000 yr cycle. The spectral analysis of Potassium data did not visualize significant cycles. The spectral analysis of the carbonate percentages and calcium data visualized dual cycles of 1700-700 yr and 493-329 yr respectively. The about 500 yr and 1000 yr cycles are related to Sun activity. Other oceanographic and atmospheric factors could generate other cycles of 1700 yr, 700 yr, 493 yr, and 329 yr. The majority of these cycles were worldwide recorded as interplay between the oceanography and the solar forcing. Contrary to the earth-driven cyclostratigraphy related to orbital parameters and geographical positions, the Holocene cyclostratigraphy is sun-driven.
机译：解释古代旋回地层学的Milancovitch理论没有提出全新世旋回地层学的案例。取而代之的是，其他天文学和海洋学机制控制着全新世沉积物内部的周期性。这项工作旨在通过使用不同的代用物：磁化率，碳酸盐百分率和化学元素（Ca，Na和K）来找出突尼斯地中海沿岸的Sidi Mansour塞布卡河沿核心的气候循环。根据研究区域先前的放射性碳和年代学测年，估计岩心覆盖了最后一个千年，沉积速率为0.35毫米/年。该速率允许精心设计深度年龄模型以进行光谱分析。并非所有代理都可以看到相同的气候周期。例如，磁化率和钠数据的频谱分析显示了1000年的周期。钾数据的光谱分析未显示出明显的周期。碳酸盐百分比和钙数据的频谱分析分别显示了1700-700年和493-329年的双循环。大约500年和1000年的循环与太阳活动有关。其他海洋和大气因素可能产生其他1700年，700年，493年和329年的周期。这些周期的大多数在世界范围内被记录为海洋学与太阳强迫之间的相互作用。与与轨道参数和地理位置有关的地球驱动的地层相反，全新世的旋转地层是太阳驱动的。

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