Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Relative Dating of Moraines from the Arid Part of Altai: Applying of Rock Weathering and Colonization by Biota Data within the Framework of the Method

Version 1 : Received: 26 February 2021 / Approved: 1 March 2021 / Online: 1 March 2021 (12:30:16 CET)

How to cite: Ganyushkin, D.A.; Lesovaya, S.N.; Vlasov, D.Y.; Kopitsa, G.P.; Almásy, L.; Chistyakov, K.V.; Panova, E.G.; Derkach, E.; Alekseeva, A. Relative Dating of Moraines from the Arid Part of Altai: Applying of Rock Weathering and Colonization by Biota Data within the Framework of the Method. Preprints 2021, 2021030002 (doi: 10.20944/preprints202103.0002.v1). Ganyushkin, D.A.; Lesovaya, S.N.; Vlasov, D.Y.; Kopitsa, G.P.; Almásy, L.; Chistyakov, K.V.; Panova, E.G.; Derkach, E.; Alekseeva, A. Relative Dating of Moraines from the Arid Part of Altai: Applying of Rock Weathering and Colonization by Biota Data within the Framework of the Method. Preprints 2021, 2021030002 (doi: 10.20944/preprints202103.0002.v1).

Abstract

For the Altai mountainous region, especially the arid south-eastern part, the history of glacier fluctuations in Pleistocene and Holocene is still poorly known. The key plots were located in the Kargy valley (2288-2387 m a. s. l.) that is not currently affected by glaciations. The relative dating method was applied to define Pleistocene moraine chronology and configuration in the Kargy valley. Taking into account that relative dating methods are primarily based on weathering pat-terns, the mineralogy, porosity, and specificity of biological colonization as an agent of weath-ering were obtained for the moraine samples. Three moraine groups of different age (presumably MIS 6, MIS 4, and MIS 2) were identifies based on detailed investigation of morphological features. The moraine age was indirectly confirmed by the mesostructure of the moraine samples repre-sented by fine-grained shale: the older sample is characterized by a more developed fractal sur-face than the younger one. The growth of biota (crustose lichen and micromycetes) leads to initial biomass accumulation and subsequent rock disintegration. The accumulation of autochthonous fine earth on the rock surface was considered the initial stage of fine earth formation affected by biota.

Subject Areas

biota colonization; weathering; rock porosity; Pleistocene moraines; moraine relative dating

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