气候变化领域集成服务门户(CCPortal): Long-term cooling/drying record of North China since the middle Pleistocene from geochemical evidence of a 150 m deep drill core, Beijing plain, China

CCPortal

DOI	10.1016/j.quaint.2014.07.037
	Long-term cooling/drying record of North China since the middle Pleistocene from geochemical evidence of a 150 m deep drill core, Beijing plain, China
	Cai, Maotang; Wei, Mingjian; Yang, Yibo; Wang, Junping; Xu, Dainan
通讯作者	Cai, MT (通讯作者)
发表日期	2014
ISSN	1040-6182
EISSN	1873-4553
起始页码	419
结束页码	427
卷号	349
英文摘要	The Quaternary strata in North China primarily consist of fluvial sediments, which react strongly to East Asian Monsoon circulation. However, the records of the Quaternary climate change history in terms of these fluvial sedimentations were limited which impeded understanding the East Asian Monsoon evolution in North China. Thus, a 150 m deep drill core was collected from Changping in the Beijing plain to reconstruct the Quaternary palaeoenvironmental changes. The core was chronologically well constrained using palaeomagnetic and thermoluminescence dating. The magnetostratigraphic result indicated that the Brunhes/Matuyama boundary is at 134.2 m (0.78 Ma) and the age at the bottom of the core is 1.07 Ma. The thermoluminescence (TL) dating of the upper sand at similar to 2 m was 10.4 ka. The chemical weathering history since the middle Pleistocene in Beijing plain was reconstructed by using geochemical proxies including selected major element pairs, chemical index of alteration and Al2O3-CaO* -(Na2O + K2O) diagrams. The CIA value of the Changping core ranged from 50.3 to 69.4 (average 59.2), which indicated that the sediment has experienced incipient to intermediate chemical weathering during the middle Pleistocene. The result of A-CN-K figure shows a high plagioclase to K-feldspar ratio in the source, which would be indicative of a granodiorite (Gd) source from Jundu Mountains north of the Beijing plain. All the geochemical results revealed a long-term gradual decrease of weathering since the middle Pleistocene, which implied a long-term increasing aridification/cooling in the Beijing plain. (C) 2014 Elsevier Ltd and INQUA. All rights reserved.
关键词	CHEMICAL-WEATHERING HISTORY TIBETAN PLATEAU YANGTZE DELTA EASTERN CHINA SEDIMENTS LOESS MONSOON INDEXES UPLIFT EVOLUTION
英文关键词	Geochemistry; Middle Pleistocene; Palaeoenvironment; Beijing plain
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000344950900047
来源期刊	QUATERNARY INTERNATIONAL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258280
推荐引用方式 GB/T 7714	Cai, Maotang,Wei, Mingjian,Yang, Yibo,et al. Long-term cooling/drying record of North China since the middle Pleistocene from geochemical evidence of a 150 m deep drill core, Beijing plain, China[J]. 中国科学院青藏高原研究所,2014,349.
APA	Cai, Maotang,Wei, Mingjian,Yang, Yibo,Wang, Junping,&Xu, Dainan.(2014).Long-term cooling/drying record of North China since the middle Pleistocene from geochemical evidence of a 150 m deep drill core, Beijing plain, China.QUATERNARY INTERNATIONAL,349.
MLA	Cai, Maotang,et al."Long-term cooling/drying record of North China since the middle Pleistocene from geochemical evidence of a 150 m deep drill core, Beijing plain, China".QUATERNARY INTERNATIONAL 349(2014).