Pleistocene climate change inferred from multi-proxy analyses of a loess-paleosol sequence in China

被引:10
|
作者
Wu, Yi [1 ,2 ]
Qiu, Shifan [3 ]
Fu, Shuqing [4 ]
Rao, Zhiguo [5 ]
Zhu, Zhaoyu [2 ]
机构
[1] South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
[2] Guangzhou Inst Geochem, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510640, Guangdong, Peoples R China
[3] Garman Normal Univ, Sch Geog & Planning, Ganzhou 341000, Peoples R China
[4] Guangzhou Inst Geog, Guangzhou 510070, Guangdong, Peoples R China
[5] Hunan Normal Univ, Coll Resources & Environm Sci, Changsha 410081, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
Loess; Magnetic minerals; Bulk grain-size; Sediment color; Hematite/goethite; East Asian monsoon; ASTRONOMICAL TIMESCALE; NORTHERN CHINA; ASIAN MONSOON; PLATEAU; LUOCHUAN; RECORDS; MA; REFLECTANCE; HEMATITE; DEPOSITS;
D O I
10.1016/j.jseaes.2017.10.007
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The aeolian loess blanketing the Chinese Loess Plateau (CLP) is sensitive to climate change in monsoonal East Asia. Here, we present a multi-proxy climatic record from a Pleistocene loess-paleosol sequence from the Lantian Basin on the southern margin of the CLP. The measurements include magnetic susceptibility and related magnetic properties, bulk median grain-size, color reflectance, and the color-inferred hematite versus goethite ratio (Hm/Gt). A long-term aridification and cooling trend during the interval from ca 2.22-0.43 Ma is indicated by two magnetic grain-size proxies, corresponding to the global climatic cooling of the late Cenozoic. In addition, at least four intervals of climatic extremes are evident in the record of Hm/Gt ratio: at 1.71-1.65 Ma, 1.26-1.24 Ma, 0.94-0.86 Ma, and 0.62-0.48 Ma. These intervals are characterized by distinct regional climates, which contrast with the global climatic conditions represented in marine sediments. For example, a relatively arid climate is documented from 1.71 to 1.65 Ma, which was rapidly succeeded by a relatively humid climate which is associated with the earliest hominin (with an age of ca 1.63 Ma) in the Lantian Basin.
引用
收藏
页码:428 / 434
页数:7
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