History of Asian eolian input to the West Philippine Sea over the last one million years
History of Asian eolian input to the West Philippine Sea over the last one million years
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DOI：
10.1016/j.palaeo.2012.02.015
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发表时间：
2012-04
期刊：
影响因子：
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通讯作者：
S. Wan;Zhaojie Yu;P. Clift;Hanjie Sun;Anchun Li;Tiegang Li
中科院分区：
文献类型：
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作者：
S. Wan;Zhaojie Yu;P. Clift;Hanjie Sun;Anchun Li;Tiegang Li
太平洋沉积物中的风成成分被认为是500 ka以来地球轨道时间尺度上大陆黄土和海洋δ 18 O气候记录之间的直接联系。在这里，我们扩展了过去一百万年的风尘记录。基于西菲律宾海国际海洋过去全球变化（ICORD）岩芯MD 06 -3050的δ 18 O年代学，建立了高分辨率的粘土矿物地层学，以追踪粘土矿物的来源，并重建1.0Ma以来亚洲风成输入盆地的过去变化的代用记录。MD 06 -3050岩心的粘土矿物组合主要由蒙皂石（~65%）和伊利石（~25%）组成，少量高岭石（~5%）和高岭石（~5%）。物源分析表明，蒙皂石主要来源于吕宋岛火山岩的风化作用，伊利石、高岭石和高岭石则主要来源于东亚冬季风从中亚地区吹来的风尘。MD 06 -3050孔中的伊利石/蒙皂石值在冰期期间通常较高且变化较大，而在间冰期期间较低，这表明西菲律宾海的风成输入量较高通常与东亚冬季风强度和亚洲大陆的干旱程度共同变化。1.0Ma以来。谱分析进一步揭示了1.0Ma以来高纬冰川活动范围、东亚冬季风强度和西菲律宾海风成输入在偏心率（100 ka）、旋进率（41 ka）和岁差（23 ka）波段上的密切联系。
The eolian component in Pacific Ocean sediments has been recognized as providing a direct link between the continental loess and marine δ18O climate records over orbital timescales since 500ka. Here we extend this eolian record over the past one million years. We constructed high-resolution clay mineral stratigraphies based on δ18O chronology in sediments from the International Marine Past Global Change (IMAGES) Core MD06-3050 from the West Philippine Sea in order to trace the sources of clay minerals and reconstruct proxy records of past changes in the Asian eolian input to the basin since 1.0Ma. The clay mineral assemblage in Core MD06-3050 mainly consists of smectite (~65%) and illite (~25%), with minor kaolinite (~5%) and chlorite (~5%). Provenance analysis suggests that smectite was derived mainly from the weathering of volcanic rocks on Luzon island, whereas illite, chlorite and kaolinite were mainly transported as eolian dust by the East Asian winter monsoon from central Asia. Illite/smectite values in Core MD06-3050 are generally higher and more variable during glacial periods and lower during interglacials, suggesting that higher eolian input to the West Philippine Sea generally co-varied with East Asian winter monsoon intensity and more aridity in continental Asia since 1.0Ma. Spectral analysis further reveals the close link between the extent of high-latitude glaciation, East Asian winter monsoon intensity and eolian input to the West Philippine Sea at eccentricity (100ka), obliquity (41ka) and precession (23ka) bands since 1.0Ma.