International Geologiical Congress - Oslo 2008


Search Abstracts

Author Index

Symposia Programmes





EIG-02 Geological sources of global magnetic anomalies as interpreted from World Digital Magnetic Anomaly Map (WDMAM)


Confirmation of middle-pleistocene red-clay and the preliminary research on its magnetostratigraphy, Nanjing


Zhuliang Yang, Nanjing Institute of Geology and Mineral Resources (China)
Cunli Hu, Nanjing Institute of Geology and Mineral Resources (China)
Xianzhong Yang, Nanjing Institute of Geology and Mineral Resources (China)


Middle-Pleistocene red-clay was rarely seen in Nanjing, so that we can not know what happened in the geological period. During the 3-D urban geological mapping (2003-2008) in Nanjing, we fortunately found it in a drill core. This suit of sediments is made up of four cycles of bright-red to brick-red sand-bearing clay, thin-bedded sandy gravel, hard-plastic clay and brown-yellow to soil-yellow sand-bearing clay. From the lower to the upper part, both the content of magnetic minerals and the magnetic capacity increase with the increasing hydrodynamic condition. The average P value is 1.0329, A value is 1.77, Fs value is 1.0232 and Q value is 0.60. Magnetostratigraphic researches indicate that it is a suit of ordered sediments formed in a hydrostatic condition by normal gravity differentiation. It is quite different from the upper-covered Xiashu loess which is widely spread in Nanjing and can be compared with those red-clay profiles, such as that in Xuancheng, Anhui Province in the middle-lower reaches of Yangtze River.


CD-ROM Produced by X-CD Technologies