Chemical overprint on the natural remanent magnetization of a subtropical red soil sequence in the Bose Basin, southern China

被引：27

作者：

Deng, Chenglong

Liu, Qingsong

Wang, Wei

Liu, Caicai

机构：

[1] Chinese Acad Sci, Inst Geol & Geophys, Paleomagnetism & Geochronol Lab SKL LE, Beijing 100029, Peoples R China

[2] Univ Southampton, Natl Oceanog Ctr, Southampton SO14 3ZH, Hants, England

[3] Nat Hist Museum Guangxi Zhuang Autonomous Reg, Nanning 530012, Peoples R China

来源：

GEOPHYSICAL RESEARCH LETTERS | 2007年 / 34卷 / 22期

关键词：

D O I：

10.1029/2007GL031400

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We present a high-resolution paleomagnetic investigation of the subtropical red soil sequence at the Damei section, Bose Basin, southern China. Maghemite with low coercivities and fine-grained hematite with high coercivities but relatively low unblocking temperatures were identified as main carriers of the natural remanent magnetization (NRM). Strong chemical weathering occurring under subtropical climatic conditions in southern China led to a chemical remanent magnetization (CRM) overprint that is sufficiently strong to mask the primary NRM. Analysis of the Bose Basin soil sequence indicates that the CRM has a large lock-in depth (> 4 m). This example shows that magnetostratigraphic studies on red soil sequences in subtropical-tropical southern China should be interpreted with caution.

引用

页数：7

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