干旱区生态环境知识资源中心(Arid): 西菲律宾海GX149柱状样沉积物磁学性质及其环境意义

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	西菲律宾海GX149柱状样沉积物磁学性质及其环境意义
其他题名	Magnetic properties of core GX149 sediments from the West Philippine Sea and their environmental implications
	李波 1; 石显耀 2; 王艳 3; 李顺 4; 张江勇 4; 田成静 4; 李学杰 4; 钟和贤 4
来源期刊	地学前缘
ISSN	1005-2321
出版年	2017
卷号	24 期号:3 页码:341-349
中文摘要	对取自西菲律宾海西部的GX149柱状样沉积物进行详细的环境磁学研究,揭示其蕴含的环境意义和物源信息。岩石磁学结果表明,GX149柱状样沉积物中携磁矿物以低矫顽力磁铁矿为主;反映磁性颗粒粒径的King图与Day图显示沉积物中磁性矿物以准单畴(PSD)为主。剖面上磁学参数变化明显,以磁性矿物粒径参数(chi_(ARM)/chi)作为替代指标反演古气候变化结果显示:冷期沉积物中磁性矿物含量相对更高,粒径更粗,高矫顽力矿物含量增加;而暖期沉积物中磁性矿物含量相对较低,粒径更细,高矫顽力矿物含量降低。干燥、寒冷、风大的冷期气候下,东亚季风携带的粉尘输入增加导致沉积物中高矫顽力矿物含量增多;而温暖湿润的暖期,沉积物中风成粉尘输入减少,高矫顽力矿物含量降低。GX149柱状样沉积物与西菲律宾海其他区域以及南海沉积物相似的磁学特征,相同的冰期间冰期旋回趋势说明沉积物磁学特征对气候变化的响应在东亚地区具有共性。
英文摘要	The sediment core GX149 collected from the western West Philippine Sea was selected for environmental magnetic studies to reconstruct paleoenvironment and trace the provenance of sediments. Rock magnetic results indicate that the low-coercivity magnetite is the dominant magnetic mineral in the sediments. The King Plot and Day Plot, which reflect the magnetic particle size, show that pseudo-single-domain (PSD) phase magnetic particles are predominant magnetic minerals in the sediments. The variation in magnetic parameters on the profile is obvious. Climate change indicated by the parameter of magnetic particle size (chi_(ARM)/chi) shows that high magnetic concentrations in sediments are related to cold periods, in which the amount of high coercivity minerals increased, and the grain size is coarser, while during warm periods the sediments are characterized by low magnetic concentrations, decreased amount of high coercivity minerals, and finer-grain size. Eolian transport by Asian monsoon is inferred to deliver increasing amounts of high coercivity minerals into the sediments during a colder, windier, and more arid condition. On the contrary, a decreasing amount of high coercivity minerals were delivered to sediments during a warmer and humid condition. The similar magnetic properties and the same glacial-interglacial cycles in magnetic profile between West Philippine Sea and South China Sea imply similar magnetic response to regional climate changes in East Asia.
中文关键词	西菲律宾海 ; 磁学特征 ; 粒径 ; 古气候
英文关键词	West Philippine Sea magnetic properties grain size paleoclimate
语种	中文
国家	中国
收录类别	CSCD
WOS类目	OCEANOGRAPHY ; GEOLOGY
WOS研究方向	Oceanography ; Geology
CSCD记录号	CSCD:5990662
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235812
作者单位	1.中国地质调查局广州海洋地质调查局, 国土资源部海底矿产资源重点实验室, 广州, 广东 510075, 中国; 2.中国地质调查局, 北京 100037, 中国; 3.广东省有色地质勘查院, 广州, 广东 510080, 中国; 4.中国地质调查局广州海洋地质调查局, 广州, 广东 510075, 中国
推荐引用方式 GB/T 7714	李波,石显耀,王艳,等. 西菲律宾海GX149柱状样沉积物磁学性质及其环境意义[J],2017,24(3):341-349.
APA	李波.,石显耀.,王艳.,李顺.,张江勇.,...&钟和贤.(2017).西菲律宾海GX149柱状样沉积物磁学性质及其环境意义.地学前缘,24(3),341-349.
MLA	李波,et al."西菲律宾海GX149柱状样沉积物磁学性质及其环境意义".地学前缘 24.3(2017):341-349.