伊犁黄土的磁学性质及其与黄土高原对比

被引：56

作者：

宋友桂 ^{[1
]}

史正涛 ^{[2
]}

方小敏 ^{[3
]}

NIE Junsheng ^{[4
]}

NAOTO Ishikawa ^{[5
]}

强小科 ^{[1
]}

王旭龙 ^{[1
]}

机构：

[1] 中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室

[2] 云南师范大学地理科学与旅游学院

[3] 中国科学院青藏高原研究所

[4] Jackson School of Geosciences,University of Texas at Austin

[5] Graduate School of Human and Environmental Studies,Kyoto

来源：

中国科学:地球科学 | 2010年 / 40卷 / 01期

基金：

中国博士后科学基金;

关键词：

黄土; 磁学性质; 磁化率; 伊犁盆地; 黄土高原;

D O I：

暂无

中图分类号：

P642.114 [];

学科分类号：

摘要：

近20多年来黄土高原的黄土磁学性质与古气候研究取得了重要进展,极大地推动了东亚古季风演化、亚洲内陆干旱化及过去全球变化的研究,但对亚洲内陆天山地区的黄土磁学性质知之甚少.选择天山伊犁盆地黄土剖面进行了系统的磁性测量,包括磁化率、无磁滞磁化率、高低温磁化率和磁滞参数等,并与黄土高原进行了对比,开展了伊犁黄土的X射线衍射矿物学分析,初步探讨了伊犁黄土磁化率增强的机制.结果表明,伊犁黄土磁性矿物的总含量要远远低于黄土高原,但磁性矿物类型与黄土高原黄土基本类似,以磁铁矿、磁赤铁矿和赤铁矿为主,部分样品还有钛铁矿等.在磁性矿物中磁赤铁矿占的比例总体上要比黄土高原黄土低,而磁铁矿和赤铁矿占的比例比黄土高原黄土要高.磁性矿物的粒度要比黄土高原粗,以准单畴(PSD)和多畴(MD)为主.成壤作用产生的细粒超顺磁体对磁化率的贡献非常有限,粒径为PSD和MD的磁铁矿和磁赤铁矿为伊犁黄土磁化率的主要贡献者.伊犁黄土磁化率增强既有风速论模式(阿拉斯加或西伯利亚黄土成土模式),又有黄土高原超细颗粒成壤模式,但以前一种模式为主导.伊犁黄土磁化率增强除与源区的原生磁性矿物有关以外,还与当地的地形气候环境和地质背景有关.伊犁黄土磁化率增强的机制十分复杂,将磁化率应用古气候的解释时要慎重.

引用

页码：61 / 72

页数：12

共 35 条

[11]

新疆西风区黄土沉积特征与古气候[M]. 海洋出版社 , 叶玮著, 2001

[12]

The formation of loess deposits in the Tashkent region and parts of Central Asia;and problems with irrigation, hydrocollapse and soil erosion[J] . I.J. Smalley,N.G. Mavlyanova,Kh.L. Rakhmatullaev,M.Sh. Shermatov,B. Machalett,K. O’Hara Dhand,I.F. Jefferson.Quaternary International . 2006

[13]

Multidisciplinary approach for paleoenvironmental reconstruction in loess-paleosol studies of the Darai Kalon section, Southern Tajikistan[J] . A.E. Dodonov,T.A. Sadchikova,S.N. Sedov,A.N. Simakova,L.P. Zhou.Quaternary International . 2006

[14]

Temperature dependence of magnetic susceptibility in an argon environment: implications for pedogenesis of Chinese loess/palaeosols[J] . Qingsong Liu,Chenglong Deng,Yongjae Yu,José Torrent,Michael J. Jackson,Subir K. Banerjee,Rixiang Zhu.Geophysical Journal International . 2005 (1)

[15]

The loess record in southern Tajikistan and correlation with Chinese loess[J] . Z.L. Ding,V. Ranov,S.L. Yang,A. Finaev,J.M. Han,G.A. Wang.Earth and Planetary Science Letters . 2002 (3)

[16] Paleoclimatic significance of the temperature-dependent susceptibility of Holocene loess along a NW-SE transect in the Chinese loess plateau [J].

Deng, CL ;

Zhu, RX ;

Verosub, KL ;

Singer, MJ ;

Yuan, BY .

GEOPHYSICAL RESEARCH LETTERS, 2000, 27 (22) :3715-3718

[17]

Rock magnetic and grain size evidence for intensified Asian atmospheric circulation since 800,000 years B.P. related to Tibetan uplift[J] . Xiao-Min Fang,Ji-Jun Li,Rob Van der Voo.Earth and Planetary Science Letters . 1999 (1)

[18]

Asian summer monsoon instability during the past 60,000 years: magnetic susceptibility and pedogenic evidence from the western Chinese Loess Plateau[J] . Xiao-Min Fang,Yugo Ono,Hitoshi Fukusawa,Pan Bao-Tian,Ji-Jun Li,Guan Dong-Hong,Keiichi Oi,Sumiko Tsukamoto,Masayuki Torii,Toshiaki Mishima.Earth and Planetary Science Letters . 1999 (3)

[19]

Magnetic properties of modern soils and Quaternary loessic paleosols: paleoclimatic implications[J] . Barbara A. Maher.Palaeogeography, Palaeoclimatology, Palaeoecology . 1998 (1)

[20] Variable shape of magnetic hysteresis loops in the Chinese loess-paleosol sequence [J].

Fukuma, K ;

Torii, M .

EARTH PLANETS AND SPACE, 1998, 50 (01) :9-14

← 1 2 3 4 →