Mineral magnetism to probe into the nature of palaeomagnetic signals of subtropical red soil sequences in southern China
作者： Caicai Liu , Chenglong Deng , Qingsong Liu , Longting Zheng , Wei Wang
DOI: 10.1111/J.1365-246X.2010.04592.X
关键词:
摘要: SUMMARY Magnetic polarity stratigraphy has proved to be useful in dating of both marine and terrestrial sedimentary sequences over the world. However, reliability magnetostratigraphic results red soil subtropical southern China been found variable different regions. To probe into capabilities recording magnetic soils, three have selected for detailed mineral magnetic, petrographic and/or palaeomagnetic analyses. These include Xuancheng Qiliting sequences, which are located lower reaches Yangtze River Damei sequence Bose Basin near Tropic Cancer. Palaeomagnetic indicate that recorded Brunhes Chron late Matuyama Chron, including a short interval probably representing Santa Rosa geomagnetic event. The faithfully palaeogeomagnetic field behaviour while failed. Detailed measurements suggest four minerals (magnetite, maghemite, haematite goethite) contained studied but characteristic remanent magnetization (ChRM) carriers different. For samples, ChRM magnetite haematite, all detrital origin. ChRMs samples carried by pedogenic with an unblocking temperature (TB) about 630–640 °C, overprinted primary remanence deposits. This is mainly produced chemical weathering, commonly intensified climate high rainfall. It further suggests climatic conditions great effect on nature signals sequences. In addition, pigment components soils may used degree remagnetization.
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