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- W2363963695 abstract "Cretaceous marine sediments spread widely in the Gyangze area, Southern Tibet. The Chuangde Section is one of the most studied sections in this area. According to the lithology, the section is divided into 4 units from bottom to top: black unit, white unit, red beds units , and olistostrome unit. This paper analyzed the contents of Fe and Al, the ratios of Fe3+/Fe2+ and the characteristic of spectral data of the samples from different units of the Chuangde Section. Fe decreases from the bottom of black unit to the upper part of white unit, but it reaches to a highest value in the red bed. The plot of the content of Al represents a similar trend with that of Fe. Both of them have highest average value in the red beds. The Fe3+/Fe2+ ratio declines slightly from the black unit to white unit, but it reaches to a highest value in the red bed. By analyzing the ratios for Fe and Al, we believe that the Fe in the red bed was terrigenous. Fe′s enrichment in the red bed means an increased terrestrial input. The Al and Fe in the black unit and white unit have very low correlation coefficients. Though there is not exact explanation for it, we believe that it was caused by the pyritization. The spectral curves of samples from different units were estimated in this paper. To make the spectral data easier to be interpreted, we calculated the first derivative of the raw spectral curves. First derivative curves for the black unit and white unite have two peaks in the wavelength of 435 nm and 500 nm. In contrast, the samples of red bed have a single prominent peak in the wavelength of 565 nm. It indicates that the red bed is rich in hematite and the other units contain goethite. Combined with previous researches, we believe that the iron in the red bed came from terrestrial input and is oxygenated after precipitation. The bottom water was in a highly oxide state." @default.
- W2363963695 created "2016-06-24" @default.
- W2363963695 creator A5091792026 @default.
- W2363963695 date "2008-01-01" @default.
- W2363963695 modified "2023-10-14" @default.
- W2363963695 title "The Occurrence of Iron in the Chuangde Section of Gyangze,Southern Tibet:Implications for the Paleoceanography" @default.
- W2363963695 hasPublicationYear "2008" @default.
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