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| Titel |
Palynostratigraphical correlation of the excavated Miocene lignite seams of the Yatağan basin (Muğla Province, south-western Turkey) |
| VerfasserIn |
Johannes Martin Bouchal, Friðgeir Grímsson, Thomas Denk |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250126120
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| Publikation (Nr.) |
 EGU/EGU2016-5800.pdf |
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| Zusammenfassung |
| The excavated main lignite seams and overlying lacustrine sediments of the opencast mines
Eskihisar, Salihpaşalar, and Tı naz, Muğla Province, south-western Turkey were investigated
using a high taxonomic resolution palynological approach.
The Eskihisar section comprises 47m and 56 samples of which 30 were usable for
palynological analysis. The Tı naz section comprises 75 m and 29 samples of which 15 were
usable for palynological analysis. Finally, the Salihpaşalar section comprises 25 m and
26 samples of which 16 were usable for palynological analysis. The age of the
palynological sections is middle to late Miocene based on radiometric dating and vertebrate
fossils.
In order to investigate dispersed pollen and spores and their botanical affinities a
combined light microscopy and scanning electron microscopy approach was used. The rich
palynoflora comprises: seven types of algal cysts (Botryococcus, Zygnemataceae), seventeen
spore types belonging to Lycopsida (club mosses), Marsileaceae (water-clover),
Osmundaceae, Pteridaceae (brake), and Polypodiaceae; 14 types of gymnosperm pollen
belonging to Ephedraceae (Mormon tea), Cupressaceae, Pinaceae (Cathaya, cedar, hemlock,
pine, spruce); five types of monocotyledone pollen belonging to Poaceae (grasses, common
reed), and Typhaceae (bulrush, bur-reed); ca 90 dicotyledone pollen types belonging to
Altingiaceae (sweet gum), Amaranthaceae (goosefoot), Anacardiaceae (sumac family),
Apiaceae (parsley family), Aquifoliaceae (holly), Asteraceae (sunflower family), Betulaceae
(alder, birch, hazel, hophornbeam, hornbeam), Campanulaceae (bellflower family),
Cannabaceae (hackberries), Caprifoliaceae (honeysuckle, teasel family), Caryophyllaceae
(pink family), Ericaceae (heather family), Eucommiaceae, Euphorbiaceae (spurge family),
Fabaceae (bean family), Fagaceae (beech, oak), Geraniaceae (storkbills), Juglandaceae
(hickory, walnut, wingnut), Lamiaceae (bagflower), Linaceae (flax), Lythraceae
(waterwillow), Malvaceae (basswood, mallow family), Myricaceae (bayberry), Oleaceae
(olive family), Onagraceae (evening primrose family), Plumbaginaceae (sea-lavender),
Polygonaceae (docks, knotweed), Ranunculaceae (buttercup family), Rosaceae (rose
family), Salicaceae (willow), Sapindaceae (maple), Sapotaceae, and Ulmaceae (elm,
Zelkova).
The objectives of this investigation were (1) to evaluate whether the three palynological
sections were deposited at the same time, and (2) to show regional vegetation differences
within a single sedimentary basin.
We found three general pollen zones corresponding to different sedimentary settings and
palaeoenvironments. The first pollen zone was linked to lignite formation (swamp forest, fern
spores, Alnus, Decodon). The second pollen zone reflects lacustrine conditions (Typhaceae)
and surrounding hinterland vegetation dominated by Fagaceae. The third pollen zone
is dominated by herbaceous taxa, whereas woody taxa are less diverse and less
abundant.
In general, the three palynological sections are congruent in reflecting distinct pollen
zones. However main vegetation types may be represented by different dominating taxa (e. g.
Alnus dominace in Eskihisar and Tı naz localities while absent in Salihpaşalar) and rare taxa
may differ between localities.
Our results demonstrate that in order to achieve a comprehensive understanding of
environmental and vegetation conditions in a sedimentary basin, a single palynological
section (locality) may not capture the entirety of environmental conditions and changes. |
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