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首页> 外文期刊>Scientific reports. >An optimized chronology for a stalagmite using seasonal trace element cycles from Shihua Cave, Beijing, North China
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An optimized chronology for a stalagmite using seasonal trace element cycles from Shihua Cave, Beijing, North China

机译：利用北京市北京市北京季节季节性微量元素循环的石笋优化年表

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Stalagmites play an important role in paleoclimatic reconstructions from seasonal to orbital time scales as 230Th-dating can provide an accurate absolute age. Additionally, seasonal trace element and optical layers can provide a precise age. We analyzed the seasonal variability of multiple trace elements on a stalagmite (XMG) in Shihua Cave, Beijing and compared them with results from laminae counting. The results show that (1) the polished section of the topmost part of XMG has obvious bi-optical layers under a conventional transmission microscope, however, laminae are not observed using this method in the rest of the sample, and (2) The variations of P/Ca, Sr/Ca, Ba/Ca, U/Ca and Mg/Ca show seasonal cycles throughout the sample. The PC1 in the Principal Component Analysis (PCA) of five trace elements represents the annual cycle. This stalagmite was deposited over 150?±?1 years through PC1 peak counting. This result corresponds well with the annual layers and U-Th dating. Trace element cyclicity of PC1 can increase the accuracy of stalagmite dating, especially in the absence of obvious laminae and are a powerful method to identify seasonal changes in a strongly contrasting wet-dry monsoon climate region.
机译：Stalagmites在季节性重建中发挥着重要作用，从季节性重建到轨道时间尺度，因为230次约会可以提供准确的绝对年龄。此外，季节性迹线元件和光学层可以提供精确的年龄。我们分析了北京市石华洞穴（XMG）上多痕量元素的季节变异性，并将其与薄层计数的结果进行了比较。结果表明，（1）XMG最顶部的抛光截面在常规透射显微镜下具有明显的双光学层，然而，在样品的其余部分中使用该方法观察到薄层，以及（2）变型P / CA，SR / CA，BA / CA，U / CA和MG / CA在样品中显示季节性循环。五个跟踪元素的主要成分分析（PCA）中的PC1代表年度周期。通过PC1峰值计数，将该石笋沉积超过150？±1年。这结果与年度层和u-th约会很好。 PC1的痕量元素循环可以提高石笋约会的准确性，尤其是在没有明显的薄片的情况下，是识别强烈湿润季风气候区的季节变化的强大方法。

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