Spatial and glacial‐interglacial variations in provenance of the Chinese Loess Plateau
Spatial and glacial‐interglacial variations in provenance of the Chinese Loess Plateau
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DOI：
10.1029/2012gl053304
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发表时间：
2012-10
影响因子：
5.2
通讯作者：
G. Xiao;K. Zong;Gaojun Li;Zhaochu Hu;G. Dupont‐Nivet;Shuzhen Peng;Kexin Zhang
中科院分区：
文献类型：
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作者：
G. Xiao;K. Zong;Gaojun Li;Zhaochu Hu;G. Dupont‐Nivet;Shuzhen Peng;Kexin Zhang
中国黄土高原面积超过44万km 2，为新近纪气候提供了前所未有的陆地记录。然而，这些黄土沉积物的物源是一致的还是存在时空差异，目前尚不清楚。在这里，这是通过比较碎屑锆石年龄谱的典型黄土和古土壤样品从三个遥远的网站位于西部，中部和东南部的CLP。结果表明，锆石年龄谱不仅在黄土层和古土壤层之间变化，而且从西部到东部的CLP，至少在末次冰期循环。不同地点锆石年龄谱的差异表明，CLP黄土的物源是不均匀的和空间可变的，虽然它已经表明，CLP黄土沉积物的矿物，元素和同位素组成是高度均匀的空间和冰期-间冰期旋回。
The Chinese Loess Plateau (CLP) covers an extensive area over 440,000 km2and provides an unprecedented terrestrial record of Neogene climate. However, it is still unclear whether the provenance of these loess deposits is uniform or contains spatial and temporal differences. Here this is addressed by comparing detrital‐zircon age spectra of typical loess and paleosol samples from three distant sites located at the western, middle, and southeastern parts of the CLP. Our results reveal that the zircon age spectra not only change between loess and paleosol layers but also vary from the western to the eastern CLP, at least during the last glacial cycle. The discrepancies of the zircon age spectra among different sites suggest that the loess provenance of CLP is heterogeneous and spatially variable, although it has been suggested that the mineralogical, elemental and isotopic compositions of loess deposits on CLP are highly homogenous spatially and in glacial‐interglacial cycles.