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| Titel |
Reinvestigation of the Miocene palynoflora from the Daotaiqiao Formation of
north-eastern China using SEM |
| VerfasserIn |
Elvan Akyurt, Friðgeir Grímsson, Reinhard Zetter, Qin Leng, Johannes Martin Bouchal |
| 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 |
250125943
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| Publikation (Nr.) |
 EGU/EGU2016-5601.pdf |
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| Zusammenfassung |
| Here we report the first results of an ongoing study on the Miocene palynoflora from the
Daotaiqiao Formation of north-eastern China. Using the single grain technique, we examined
individual pollen and spores using both light and scanning electron microscopy. A previous
study by Grímsson et al. (2012) on Onagraceae pollen grains from this locality, using the
same technique identified five different species. Such a variety of Onagraceae from a single
palynoflora is unknown elsewhere. The ongoing study suggests a remarkably rich pollen and
spore flora with at least 15 different types of spores, one Ginkgo and one Ephedra type
pollen, 11 conifer pollen types and approximately 145 angiosperm pollen types. Spores are
very rare in the samples (≤1%). Conifer pollen grains are regularly observed but
are not a dominant component (ca. 16 %). The samples yield a high quantity and
diversity of angiosperm pollen (ca. 80%). The conifers include representatives of
Cupressaceae (2 spp.), Pinaceae (Larix, Picea, Pinus, Tsuga) and Sciadopityaceae. The
angiosperm pollen cover at least 40 families. Prominent elements are pollen of the
Betulaceae (Alnus, Betula, Carpinus, Corylus), Cercidiphyllaceae (Cercidiphyllum),
Ericaceae (8 spp.), Eucommiaceae (Eucommia), Fagaceae (Fagus, Quercus spp.,
Castaneoideae), Juglandaceae (Carya, Cyclocarya, Juglans, Pterocarya), Rosaceae (11 spp.),
Sapindaceae (Acer, Aesculus) and Ulmaceae (Hemiptelia, Ulmus, Zelkova). The high
angiosperm pollen diversity indicates a varying landscape with a relatively high variety
of niches including riparian, dry and mesic forests. Most of the potential modern
analogues of the fossil taxa are currently thriving under humid temperate (Cfa- and
Cwa)-climates, pointing to paleoclimate conditions not unlike those found today in the
lowlands and adjacent mountain regions of the (south-) eastern United States, the
humid-meridional region of western Eurasia, and central and southern China, and Honshu
(Japan).
References:
Grímsson F, Zetter R, Leng Q. 2012. Diverse fossil Onagraceae pollen from a Miocene
palynoflora of north-east China: early steps in resolving the phytogeographic history of the
family. Plant Systematics and Evolution 298: 671-687. |
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