Periodicities of paleoclimate variations in the first high-resolution non-orbitally tuned grain size record of the past 1 Ma from SW Hungary and regional, global correlations

Pál Sümegi, Sándor Gulyás, Dávid Molnár, Balázs P. Sümegi, Tünde Törőcsik, Peter C. Almond, Ian Smalley, Liping Zhou, Lidija Galovic, Elemér Pál-Molnár, Qingzhen Hao, Mihály Molnár, László Koloszár

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Abstract

This paper presents the results of grain-size analyses of an independently-dated loess/paleosol record dating back ca. 1 Ma from SW Hungary. The record follows an upward coarsening trend with a clear prevalence of coarse silts and fine sands. Variations are mainly controlled by fluctuations in sand input highlighting iterative changes in dust aerodynamics over the past 1 Ma in the source region found 50–100 km NW of our site. Based on our results regional factors influenced the intensity and nature of dust accumulation. Contrasting trends with the Chinese Loess Plateau in certain periods reflect a greater importance of the Atlantic region driving the evolution of nearby continental ice sheets. Proximity and expansion of these had significant impact on local wind field. Low topography of the surrounding mountain belts allowed for the intrusion of stronger cold winds, higher abrasion in the source region and transportation of coarser particles to the site from 700 to 450 ka. Another marked upward increase in grain-size from 400 ka can be linked to increasing continentality which along with tectonic activity resulted in a drop in the groundwater table in the source region and intensified erosion of formerly relatively stable surfaces bringing more coarse material to our site.

Original languageEnglish
Pages (from-to)74-90
Number of pages17
JournalAeolian Research
Volume40
DOIs
Publication statusPublished - Oct 2019

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Keywords

  • Cycles
  • Hungary
  • Loess grain-size
  • Middle & Upper Pleistocene
  • Past aeolian dynamics

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

Cite this

Sümegi, P., Gulyás, S., Molnár, D., Sümegi, B. P., Törőcsik, T., Almond, P. C., Smalley, I., Zhou, L., Galovic, L., Pál-Molnár, E., Hao, Q., Molnár, M., & Koloszár, L. (2019). Periodicities of paleoclimate variations in the first high-resolution non-orbitally tuned grain size record of the past 1 Ma from SW Hungary and regional, global correlations. Aeolian Research, 40, 74-90. https://doi.org/10.1016/j.aeolia.2019.07.002