Magnetostratigraphic dating of loess deposits in china

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Detailed rock magnetic analyses, together with other constraints such as geochemical and cyclostratigraphic results, are required to develop a reliable temporal framework. The studied succession is located in the Aktau Mountains situated in the Ili Basin, a triangular foreland basin in southeast Kazakhstan (44°00′20.3″N 79°14′40.9″E, Figure 1). Use of other approaches such as biostratigraphy and cyclostratigraphy can help to substantiate complex magnetostratigraphic dating (Krijgsman et al., 1995; Hu et al., 2005; Abels et al., 2010; Herb et al., 2015). Albeit the controversy on the reliability of red beds (Butler, 1992), previous studies show that red beds can carry a reliable primary detrital remanent magnetization (Tauxe et al., 1980; Tauxe and Kent, 1984; Krijgsman et al., 1999; Kruiver et al., 2003).

We present an integrated approach for dating the well-exposed Bastau Formation, based on magnetostratigraphy and constraints from cyclostratigraphy and biostratigraphy. doi: 10.1007/s11200-011-9018-4 Cross Ref Full Text | Google Scholar Zhang, W.

They result from an asymmetrical anticline with a gently dipping northern flank mainly comprising lake deposits and mudflats. Properties of a detrital remanence carried by haematite from study of modern river deposits and laboratory redeposition experiments.

Bedding is fairly constant throughout the section with an average dip direction of 314° and dip angle of 10°. doi: 10.1029/2011GC003966 Cross Ref Full Text | Google Scholar Tauxe, L., and Kent, D.

The observed magnetic properties are best explained by depositional variability and magneto-mineralogical alteration effects of both dissolution and neo-formation of magnetite, including significant secondary magnetization. A new mechanism for the magnetic enhancement of hematite during heating: the role of clay minerals.

The mean of reverse polarity directions is flatter than the expected Middle Miocene Earth magnetic field, which is an indicator for the existence of inclination shallowing that supports a primary origin. doi: 10.1016/j.palaeo.20 Cross Ref Full Text | Google Scholar Yamazaki, T., Abdeldayem, A., and Ikehara, K. Rock-magnetic changes with reduction diagenesis in Japan Sea sediments and preservation of geomagnetic secular variation in inclination during the last 30,000 years. doi: 10.1186/BF03351766 Cross Ref Full Text | Google Scholar Zhang, C., Paterson, G.

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