the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Magnetic properties and geochemistry of loess/paleosol sequences at Nowdeh section northeastern of Iran
Vahid Feizi
Ghasem Azizi
Habib Alimohammadian
Maryam Mollashahi
Abstract. The loess-palesols sequences in the northeastern of Iran are high-resolution natural archive of climate and environmental change, providing evidence for the interaction between accumulation and erosion of aeolian and fluvial sediments during the Middle and Late Pleistocene. In this study, Azadshar (Nowdeh Loess Section) was selected to reconstruct Late Quaternary climate change. The Nowdeh loess/ paleosol sequences with 24 m thickness were sampled for magnetic and geochemical analysis. The section systematically and with high resolution (10 cm intervals) were sampled and totally 237 samples were taken. Magnetic susceptibility of all samples were measured in Environmental and Paleomagnteic laboratory based at Geological Survey of Iran, Tehran, Iran. The geochemical analysis of selected samples (peak of magnetic susceptibility) were included to assist the paleoclimatic interpretation of the magnetic signals. The result of magnetic susceptibility of Loess/paleosol deposits show low magnetic susceptibility values in cold and dry climate periods (Loess) and high magnetic susceptibility values in warm and humid climate periods (paleosoil). Comparison of magnetic and geochemical data show that the results of geochemical weathering ratio variations such as magnetic parameters variations are with magnetic susceptibility. High degree of coherency between the intensity of magnetic susceptibility and Rb/Sr, Mn/Ti, Zr/ Ti and Mn/ Sr ratio are confirmed.
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Vahid Feizi et al.
Status: open (until 29 Oct 2023)
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RC1: 'Comment on cp-2023-56', Anonymous Referee #1, 10 Aug 2023
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The paper entitled “Magnetic properties and geochemistry of loess/paleosol sequences at Nowdeh section northeastern of Iran“ of Feizi et al. presents magnetic susceptibility and isothermal remanent magnetization data as well as geochemical ratios of sediment samples taken from the loess-paleosol sequence at Now Deh, a loess section located in the transition zone between the Caspian Lowlands and the steep northward facing slopes of Alborz Mountains. The sequence has been studied before, but the authors resampled it and provide new data. Although the paper addresses relevant scientific questions within the scope of CP, it shows many severe deficiencies. It is thus impossible to accept the paper in the present form. I doubt that the deficiencies will be overcome within the time provided until the resubmission deadline.
A very significant flaw is the language use, which makes it hardly possible to understand what the authors want to say. Many other shortcomings could be listed. The research question is not well elaborated and it remains unclear, why the study was conducted and why the section at Now Deh was selected for this investigation. The literature cited in the introduction and the discussion sections does not include recent studies on loess deposits in the area, although these also used rock magnetic and geochemical methods to derive paleoclimate proxy data for the area. The stratigraphy of Now Deh section is not described at all. It thus remains unclear, from where the investigated samples derive. The stratigraphic column of loess and paleosol layers presented in figures 2 to 4 will provide relevant information but is not referred to at all in the text. In addition, the dating results shown therein are not discussed against the background of other recently published luminescence ages for Northern Iranian loess deposits. It is also necessary to mention the correct source of the dating results in the text and the figure captions. The quality of all figures is low, some are difficult if not impossible to read.
Overall, the presentation of the chronostratigraphic context, the origin of the samples, and the data in the results section are not convincing. The discussion lacks clear structure and is below the standard of an international paper to be published in CP. Finally, the conclusions are too general and not supported by the presented data. Overall, I have to recommend rejection of the manuscript.
Citation: https://doi.org/10.5194/cp-2023-56-RC1 -
AC1: 'Reply on RC1', Vahid Feizy, 29 Aug 2023
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Greetings and courtesy, respected referee
First of all, we need to thank you for your valuable time to review the article. The authors of this article would like to improve and increase the quality of the article with the help of you, respected referees. Therefore, all the cases mentioned by the respected referees are examined by the group of authors.
According to the explanations mentioned in the text of the article, loess sediments are one of the most important indicators of ancient climate reconstruction. The sequence of loess sediments in Nodeh section was investigated because this sequence was previously investigated by Kohl et al. in 2009 in relation to stratigraphy and climatic changes and had an acceptable age. Therefore, in this research, magnetic and geochemical reception methods have been investigated to obtain more details about the past climate changes in this region.
Regarding the question they have raised, the stratigraphy of the studied sequence has not been explained at all, it should be pointed out that the discussion of the stratigraphy of the Noda sediments sequence has been studied before and its rereading is a kind of repetition, so we tried to explain the stratigraphy of the Do not check. Regarding mentioning the source of historiography results, this can be corrected and will be corrected. Also, the quality of the figures can be changed and the shapes can be presented with a higher quality so that they can be recognized and read.
Citation: https://doi.org/10.5194/cp-2023-56-AC1
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AC1: 'Reply on RC1', Vahid Feizy, 29 Aug 2023
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Vahid Feizi et al.
Vahid Feizi et al.
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