Journal of Radioanalytical and Nuclear Chemistry
Volume/Issue:
Volume 261: Issue 2
Iron speciation related to color of Jurassic sedimentary rocks in Turpan Basin, northwest China
Authors:
Guodong Zheng

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Bihong Fu National Institute of Advanced Industrial Science and Technology Active Fault Research Center Higashi 1-1-1 Tsukuba 305-8567 Japan

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Yi Duan Chinese Academy of Sciences Lanzhou Institute of Geology 324 West Donggang Road Lanzhou 730000 P.R. China

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Qi Wang Chinese Academy of Sciences Lanzhou Institute of Geology 324 West Donggang Road Lanzhou 730000 P.R. China

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M. Matsuo The University of Tokyo Graduate School of Arts and Sciences 3-8-1 Komaba Meguro-Ku, Tokyo 153-8902 Japan

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B. Takano The University of Tokyo Graduate School of Arts and Sciences 3-8-1 Komaba Meguro-Ku, Tokyo 153-8902 Japan

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Pages:
421–427
Online Publication Date:
03 Nov 2004
Publication Date:
17 Aug 2004
Article Category:
Research Article
DOI:
https://doi.org/10.1023/b:jrnc.0000034880.20577.fb
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Abstract  

Mesozoic-Cenozoic reddish and green beds are widely distributed in northwest China. Mössbauer spectroscopy revealed that the composition of iron species varies with color in the middle-upper Jurassic sedimentary rocks from the Turpan Basin. Three main kinds of iron species were identified: (1) ferric iron of hematite (hem-Fe3+), (2) paramagnetic ferric iron (para-Fe3+), and (3) paramagnetic ferrous iron (para-Fe2+). Pyrite iron (pyr-Fe2+) was revealed only in a few samples. In general, there is a direct correlation between rock color, iron species and total iron content, however, in detail, this relationship is more complicated. The reddish rocks contain higher contents of total iron and hem-Fe3+, whereas the gray rocks contain much more para-Fe2+. However, relatively low hematite content cannot give red color to rocks, probably due to suppression by other pigments such as organic matter in black or chlorite in green. The dark or green rocks normally contain either only paramagnetic Fe2+ and paramagnetic Fe3+ species or these two species associated with hematite Fe3+, but the relative content of hematite species is lower. The variations of different iron species control lithological properties such as color and also may reflect the sedimentary conditions. Moreover, iron speciation in these rocks is one of the main factors, which result the color features of rocks in remote sensing imagery.

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Cover Journal of Radioanalytical and Nuclear Chemistry
Journal of Radioanalytical and Nuclear Chemistry
Print ISSN:
0236-5731
Online ISSN:
1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation		 1968
Volumes
per Year		 1
Issues
per Year		 12
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)

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