Lilit Pogosyan

Lilit Pogosyan
Universidad Nacional Autónoma de México | UNAM · Institute of Geology

PhD Earth Sciences

About

8
Publications
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43
Citations
Introduction
Lilit Pogosyan currently works at the Institute of Geology, Universidad Nacional Autónoma de México.

Publications

Publications (8)
Article
Full-text available
Paleosols interbedded with pyroclastic deposits have been proven to be an important paleoenvironmental proxy for the late Quaternary in Central Mexico. We studied a key upland section and several profiles on the slopes and lowlands of the Tlaxcala Block, assuming that the topographic variability of the soil-sedimentary mantle contains the complete...
Article
This research provided a model of genesis of soils in NorthWest Siberia connecting the stages of their development to the main environmental changes over the Late Pleistocene and the Holocene. The "soil memory" showed that the studied soils had a complex polygenetic origin. A gleyed paleosol with signs of solifluction found at a depth of 2 m was mo...
Article
Tepetates are indurated subsoil horizons developed in tephra-derived materials in various parts of the Trans-Mexican Volcanic Belt. The term ‘tepetate’ includes fragipans, duripans, pedosediments and saprolites, derived from vitric rhyolitic tuff, Pleistocene volcanic ashes or pyroclastic flows. All soils with tepetates are at high risk of erosion...
Article
A fragipan is a diagnostic subsurface soil, not a cemented horizon, which is characterised by high density, and so restricts root penetration and water percolation. Although fragic horizons are considered to be pedogenic, the exact genesis of this phenomenon is not well understood. Quantitative study of pore space characteristics in a profile with...
Article
Full-text available
Fragipan is a compacted but non-cemented subsurface horizon, considered as a pedogenic horizon, but the mechanism of its formation is not well understood. The main hydro-consolidation hypothesis involves a collapse of soil structure when it is loaded and wet, resulting a reorganisation of pore space. Soils with fragipan never have been marked in Ru...
Article
Full-text available
Ground ice and sedimentary records of a pingo exposure reveal insights into Holocene permafrost, landscape and climate dynamics. Early to mid‐Holocene thermokarst lake deposits contain rich floral and faunal paleoassemblages, which indicate lake shrinkage and decreasing summer temperatures (chironomid‐based TJuly) from 10.5 to 3.5 cal kyr BP with t...
Conference Paper
Full-text available
Origin of tepetate – the indurated subsoil horizons developed in tephrous materials in various parts of Transmexican Volcanic Belt– after decades of research is still under discussion. Their properties correspond in most cases to fragipans, they consist of sand-and silt-size volcanic minerals and clay made up of halloysite with admixtures of kaolin...
Article
The aim of the study was to fill the gap in the knowledge on soils of montane cloud forest: until recently the soils formed in base-rich parent material under this forest type were insufficiently studied. We provided pedogenetic analysis of soils of two localities under montane cloud forest ecosystems in Sierra Gorda Mountains, Quirétaro state, Mex...

Network

Cited By
    • University Centre in Svalbard (UNIS)
    • Lomonosov Moscow State University
    • Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
    • Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
    • Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research Potsdam

Projects

Project (1)
Project
Fossil soils are a common phenomenon in the volcanic geosystems where they are buried under lavas, pyroclastic materials and the products of their redeposition. Multiple eruptions provide regular burial of pre-existing soils giving rise to the tefra-paleosol sequences. Paleosol properties reflect past bioclimatic conditions under which soil was formed before the burial, thus successions of paleosols could provide a record of environmental change over different chronological scales. From the other hand individual buried volcanic paleosols were formed during different time intervals controlled by the eruption frequency - these are perfect objects to estimate the rates of soil development and evolution. Tephra-paleosol sequences studied in Mexico span from the late Holocene to middle Pleistocene, in Armenia we investigated early Pleistocene volcanic paleosols and pedosediments