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Mineral magnetism to probe into the nature of palaeomagnetic signals of subtropical red soil sequences in southern China

【摘要】:正Magnetic polarity stratigraphy has proved to be useful in dating of both marine and terrestrial sedimentary sequences over the world.However,the reliability of magnetostratigraphic results of red soil sequences in subtropical southern China has been found to be variable in different regions.To probe into the capabilities of recording magnetic polarity stratigraphy in the red soils,three red soil sequences have been selected for detailed mineral magnetic,petrographic and/or palaeomagnetic analyses.These include the Xuancheng and Qiliting sequences,which are located in the lower reaches of the Yangtze River and the Damei sequence in the Bose Basin near the Tropic of Cancer.Palaeomagnetic results indicate that the Xuancheng sequence has recorded the Brunhes Chron and the late Matuyama Chron,including a short interval probably representing the Santa Rosa geomagnetic event.The Xuancheng and Qiliting sequences have faithfully recorded the palaeogeomagnetic field behaviour while the Damei sequence has failed.Detailed mineral magnetic and petrographic measurements suggest that four magnetic minerals(magnetite,maghemite,haematite and goethite)are contained in the three studied sequences,but the characteristic remanent magnetization(ChRM)carriers are different.For the Xuancheng and Qiliting samples,the ChRM carriers are magnetite and haematite,which are all of detrital origin.However,the ChRMs of Damei samples are carried by pedogenic haematite with an unblocking temperature(T_B)of about 630-640℃,which has overprinted the primary remanence of the Damei red soil deposits.This pedogenic haematite is mainly produced by chemical weathering,which is commonly intensified by the climate of high temperature and rainfall.It further suggests that climatic conditions have a great effect on the nature of palaeomagnetic signals of the red soil sequences.In addition,the red pigment components in the red soils may be used to indicate the degree of remagnetization.

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