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首页> 外文期刊>Paleoceanography >X-ray fluorescence core scanning records of chemical weathering and monsoon evolution over the past 5 Myr in the southern South China Sea
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X-ray fluorescence core scanning records of chemical weathering and monsoon evolution over the past 5 Myr in the southern South China Sea

机译：X射线荧光核扫描记录南海南部过去5 Myr的化学风化和季风演变

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摘要

We present ultrahigh resolution K/Al and Ti/Al records at ODP Site 1143 for the past 5 Myr, which were obtained by nondestructive X-ray fluorescence (XRF) core scanning on the sediment surface of the archive half cores of this site at a step of 1 cm. The K/Al and Ti/Al records and their amplitudes of the variability on glacial/interglacial cycles show a markedly increasing trend since ～2.5 Ma, indicating a gradual strengthening of the chemical weathering and the East Asian summer monsoon under the influences from the Northern Hemisphere glaciation (NHG). Evolutive cross spectral analyses of K/Al with benthic foraminiferal δ~(18)O reveal that phases of the East Asian summer monsoon abruptly changed by more than 90 at 4.0 Ma, 2.75 Ma, 1.0 Ma and 0.6 Ma relative to global ice volume at the obliquity and the precession bands over the past 5 Myr. Strong 400 kyr and 100 kyr cycles in the K/Al and Ti/Al records consistently exist over the past 5 Myr. Particularly, these cycles are highly coherent with the long and short eccentricity cycles in the truncated insolation at 65N, indicating an eccentricity forcing of the East Asian summer monsoon. The chemical weathering recorded in the elemental records of ODP Site 1143 also shows highly coherent relationship with the ocean carbon reservoir at the eccentricity, the obliquity and the precession bands over the late Pliocene and Pleistocene.
机译：我们提供了过去5 Myr在ODP站点1143处的超高分辨率K / Al和Ti / Al记录，这些记录是通过在该站点的档案半芯沉积物表面的非破坏性X射线荧光（XRF）磁芯扫描获得的。步长1厘米。自〜2.5 Ma以来，K / Al和Ti / Al记录及其在冰川/间冰期循环中的变化幅度呈现出明显增加的趋势，表明在北半球影响下化学风化和东亚夏季风逐渐增强半球冰河（NHG）。底栖有孔虫δ〜（18）O与K / Al的演化谱分析表明，东亚夏季风的相变相对于全球冰量在4.0Ma，2.75Ma，1.0Ma和0.6Ma突然改变了90％以上。过去5 Myr的倾斜和进动带。在过去的5 Myr中，K / Al和Ti / Al记录中始终存在400 kyr和100 kyr的强循环。特别是，这些周期与65N截断日照下的长和短偏心周期高度一致，表明东亚夏季风被偏心。在ODP站点1143的元素记录中记录的化学风化也显示出与上新世和更新世晚期偏心，倾角和进动带的海洋碳储层高度一致的关系。

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