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首页> 外文OA文献 >Stratigraphic continuity and fragmentary sedimentation: the success of cyclostratigraphy as part of integrated stratigraphy. In: Strata and Time: Probing the Gaps in Our Understanding
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Stratigraphic continuity and fragmentary sedimentation: the success of cyclostratigraphy as part of integrated stratigraphy. In: Strata and Time: Probing the Gaps in Our Understanding

机译：地层连续性和碎片沉积：作为综合地层学一部分的旋回地层学的成功。在：地层和时间：探索我们理解中的差距

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The Milankovitch theory of climate change is widely accepted, but the registration of the climate changes in the stratigraphic record and their use in building high-resolution astronomically tuned timescales has been disputed due to the complex and fragmentary nature of the stratigraphic record. However, results of time series analysis and consistency with independent magnetobiostratigraphic and/or radio-isotopic age models show that Milankovitch cycles are recorded not only in deep marine and lacustrine successions, but also in ice cores and speleothems, and in eolian and fluvial successions. Integrated stratigraphic studies further provide evidence for continuous sedimentation at Milankovitch time scales (104 years up to 106 years). This combined approach also shows that strict application of statistical confidence limits in spectral analysis to verify astronomical forcing in climate proxy records is not fully justified and may lead to false negatives. This is in contrast to recent claims that failure to apply strict statistical standards can lead to false positives in the search for periodic signals. Finally, and contrary to the argument that changes in insolation are too small to effect significant climate change, seasonal insolation variations resulting from orbital extremes can be significant (20% and more) and, as shown by climate modelling, generate large climate changes that can be expected to leave a marked imprint in the stratigraphic record. The tuning of long and continuous cyclic successions now underlies the standard geological time scale for much of the Cenozoic and also for extended intervals of the Mesozoic. Such successions have to be taken into account to fully comprehend the (cyclic) nature of the stratigraphic record.
机译：米兰科维奇关于气候变化的理论已被广泛接受，但是由于地层记录的复杂性和零碎性，人们对气候变化在地层记录中的记录及其在建立高分辨率的天文调谐时间尺度中的使用存在争议。然而，时间序列分析的结果以及与独立的磁生物地层学和/或放射性同位素年龄模型的一致性表明，米兰科维奇周期不仅记录在深海和湖相演替中，而且还记录在冰芯和蛇鞘中，以及风成和河流成因中。综合地层研究进一步为米兰科维奇时间尺度（104年至106年）的连续沉积提供了证据。这种组合的方法还表明，在光谱分析中严格应用统计置信度限制以验证气候代用记录中的天文学强迫还没有充分依据，并且可能导致假阴性。这与最近的说法相反，即没有应用严格的统计标准会导致在搜索周期性信号时出现误报。最后，与日照变化太小而无法影响重大气候变化的论点相反，轨道极端引起的季节性日照变化可能很大（20％或更多），并且如气候模型所示，会产生巨大的气候变化，有望在地层记录中留下明显的烙印。现在，长而连续的循环演替的调整是许多新生代以及中生代延长间隔的标准地质时间尺度的基础。为了充分理解地层记录的（循环）性质，必须考虑到这样的演替。

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