Browsing by Author "Kamar, Guldem"

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A Geoscientist Approach To Palaeoclimate Reconstruction Based on Pollen Analysis of Lake Deposits; Problems and Solutions
(Tmmob Jeoloji Muhendisleri Odasi, 2022) Kamar, Guldem
Lakes contain sediments rich in organic material where pollen analysis and palaeoclimate studies can ideally be carried out. Lakes provide a habitat for many organisms, where the pollen grains are best preserved, and lake sediments also offer an archive where climatic and environmental changes are preserved. In order to make a palaeoclimatic reconstruction based on pollen analysis, the study area needs to be investigated in detail from a geological, biological, and archaeological point of view. This study aims to present a methodological perspective to researchers who want to conduct paleoclimate reconstruction through pollen analysis. The geological structure o f the region, its volcanic activity, archaeological history and the effects of the structural elements of the lake floor on the changes in the pollen diagrams are described in detail by the proposed method of this study. For this purpose, the data from studies carried out in the lakes at a close distance to each other (Eastern Anatolian plateau high altitude lakes) and the terrace deposits of Lake Van were examined under the headings of volcanic activity, human impact, sedimentation ratio and structural characteristics of the lake floor to reveal the differences. According to the results, before performing a paleoclimate reconstruction,identification of the deposit packages, local vegetative changes and current flora, the structural elements of the lake floor, human impact and volcanism should be investigated first of all under separate headings.
Holocene Palynology and Pollen-Based Palaeoclimate Reconstruction of Lake Ercek (Eastern Anatolia); Short-Term Climatic Fluctuations and Their Relation With Global Palaeoclimatic Change; Results of Cores E1 and E10
(Tmmob Jeoloji Muhendisleri Odasi, 2021) Kamar, Guldem
This study is a palynological and stratigraphical investigation of E1 and E10 core samples from the southern part of Lake Ercek (Eastern Anatolia, Turkey). Core samples were taken by a gravity corer from different water depths. Deposits in the core samples include mostly laminated rhythmic sediments, massive and graded layers and a tephra layer from E10 core, representing different time spans because of the faulted ground of the lake. Tentative time scales of the core samples are based on pollen and tephra correlation with Lake Van deposits. According to the palynological investigations, palaeovegetation of Greenlandian is represented by Amaranthaceae-dominant halophytic vegetation and semi-arid palaeoclimate conditions based on pollen analysis around Lake Ercek. The Meghalayan stage is mainly characterized by Poaceae-dominated steppe vegetation and increasing human impact according to anthropogenic pollen indicators. The Meghalayan palaeoclimate of Lake Ercek was more humid than Greenlandian and is represented by maximum deciduous Quercus expansion in recent times around the Lake Ercek area.
Palynology of Lake Arin (Eastern Anatolia, Turkey) Deposits and Its Relation With Water Level Change of Lake Van: Preliminary Findings
(Pergamon-elsevier Science Ltd, 2018) Kamar, Guldem
Palynological and lithological investigations of Lake Arin indicate mid-late Holocene lake level fluctuations both in Lake Arin and Lake Van. Pollen diagram and lithological features of sediments suggest unstable conditions during last 6 kyr BP for Lake Arin. Climatic changes and human impact have been both effective for destroying uppermost sediments of the lake. Semi-arid steppe vegetation dominance has been identified for Early Holocene around Lake Arin. (C) 2017 Elsevier Ltd and INQUA. All rights reserved.