X‐ray fluorescence core scanning records of chemical weathering and monsoon evolution over the past 5 Myr in the southern South China Sea
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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DOI：
10.1029/2010pa002045
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发表时间：
2011-12
期刊：
影响因子：
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通讯作者：
Jun Tian;Xin Xie;Wentao Ma;Haiyan Jin;Pinxian Wang
中科院分区：
文献类型：
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作者：
Jun Tian;Xin Xie;Wentao Ma;Haiyan Jin;Pinxian Wang
与底栖有孔虫d18 O的对比研究表明，东亚夏季风在4.0Ma、2.75Ma、1.0Ma和0.6Ma时，相对于近500万年来全球冰量，在赤道带和岁差带上发生了90°以上的位相突变。在过去的500万年里，K/Al和Ti/Al记录中的强400 kyr和100 kyr周期一直存在。特别是这些周期与65°N截断日射的长、短偏心率周期有很好的相关性，表明东亚夏季风存在偏心率强迫。ODP 1143站元素记录中的化学风化作用在晚上新世和更新世的偏心率、垂直度和岁差带上与海洋碳库也表现出高度一致的关系。
with benthic foraminiferal d 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 65°N, 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.