Indications of geomorphological activity in peat bog deposits in the Pirin Mountains, SW Bulgaria

Autor: Rossitza Kenderova, Sonya Stoyanova, Ahinora Baltakova, Dimitar Krenchev, Juliana Atanassova
Rok vydání: 2018
Předmět:
Zdroj: Quaternary International. 470:109-118
ISSN: 1040-6182
DOI: 10.1016/j.quaint.2018.01.028
Popis: Peat bog deposits are reliable archives of climate and environment change but their sediment origin was underestimated in the Bulgarian studies up to now. The aim of this study is to enhance the understanding of lake sedimentation in order to improve the knowledge of lake dynamics under climate change during the Holocene in the Pirin Mountains. Most of the cirques in Pirin now are occupied by lakes or peat bogs and their deposits are most informative for the post glacial environment dynamics. We used representative boreholes at 2250 m (Okadensko Lake peaty area) and 2240 m (Bezbog Lake peaty area) and one lower borehole at 1600 m (a peat bog near Gotse Delchev hut) to characterize the lateglacial and postglacial geomorphological processes. Previously published paleo paleobotanical studies of peat deposits at these different altitudes now are supplemented by sedimentological analyses (grain size, grain morphology, mineralogical and textural analysis of mineral grains). In order to distinguish indications for climate and environment changes are traced parallels between the palynological and sediment facies sequencing. Our data showed that after the active weathering and mass wasting processes in the alpine zone, which was spreading to lower altitudes (1800–1900 m) just after the glaciers retreat, in general, geomorphological processes dynamics constantly decreases. Current processes activity in the mountains remains mainly due to human impact, especially constructions and deforestation.
Databáze: OpenAIRE
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