palynology€¦ · stratigraphic range: late ordovician ... stratigraphic range: latest devonian...
TRANSCRIPT
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Palynology Spore/Pollen Morphology
Mohamed K Zobaa, PhD Department of Geology
Faculty of Science, Benha University, EGYPT [email protected]
http://incredibleworld.net/wp-content/uploads/2010/04/pollen-grains-2.jpg
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The branch of science concerned with the study of fossil and living palynomorphs The term Palynology was coined by Hyde and Williams (1944)
What is Palynology?
What are Palynomorphs?
Palynomorphs include microscopic plant and animal structures composed of sporopollenin, chitin, or related compounds that are highly resistant to most forms of decay other than oxidation
Palynomorphs are abundant in most sediments and sedimentary rocks, and are resistant to the routine pollen-extraction procedures including strong acids, bases, acetolysis, and density separation
Most palynomorphs are between 5–500 µm in size
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Common palynomorph categories:
Acritarchs
Chitinozoans
Scolecodonts
Microscopic Algae and Algal Parts
Cryptospores
Embryophyte Spores
Pollen
Dinoflagellates
Chitinous Fungal Spores and Other Fungal Bodies
Microforaminiferal Inner Tests
Megaspores
Palynodebris
Varia
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Embryophyte Spores
Stratigraphic range: Late Ordovician–present
Trilete spore (Trilobosporites laevigatus El Beialy 1994)
Embryophyte Spores are microscopic unicellular reproductive cells of certain vascular plants (those with special conducting tissues called xylem)
These spores are extremely resistant and are easily transported by wind and water
They are useful biostratigraphic tools particularly in fresh-water environments, evaporitic deposits, and where marine and fresh-water facies interdigitate
They show variable surface sculpture (ornamentation)
Monolete spore (From Zobaa et al., 2009)
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Alternation of generations in some vascular plants
(http://www.geo.arizona.edu/palynology/ppfspor.html)
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Deltoidospora mesozoica Crybelosporites pannuceus Leptolepidites psarosus
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Pollen Grains
Stratigraphic range: latest Devonian–present
Pollen grains are the containers of the male gametophyte generation of seed plants (both angiosperms and gymnosperms)
They are produced in the male organs of the flowers (anthers)
Pollen production is a strategy by which seed plants became free from dependence on standing water for fertilization
Pollination occurs by transferring pollen grains from the anthers to the female organs by wind or animals
Pollen are good biostratigraphic and paleoenvironmental tools
Afropollis jardinus
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Reproduction in flowering plants
(http://www.geo.arizona.edu/palynology/polkey.html)
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Cupuliferoipollenites sp. Tricolporopollenites kruschii Caryapollenites veripites
(Zobaa et al., 2011)
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Pinus sp.
(http://jolisfukyu.tokai-sc.jaea.go.jp/fukyu/mirai-en/2007/2_5.html)
Pinus echinata
(http://www.geo.arizona.edu/palynology/pid00005.html)
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Sample preparation for palynological analysis
Major components of a sediment/sedimentary rock sample
Carbonates
Clays
Particulate Organic Matter (POM)
Our Target
Silicates
Removed by sieving Removed by HF
Removed by HCl
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Steps of work…
1- Crushing the sample in a mortar to the powder size
2- Transferring the crushed powder into a Nalgene plastic beaker that is resistant to high temperature
3- Conc. HCl treatment
4- Washing and neutralization
5- Conc. HF treatment
6- Washing and neutralization
Porcelain mortar and pestle
Agate mortar and pestle
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7- Conc. HCl treatment
8- Washing and neutralization
9- Sieving the sample in a 125 µm brass sieve and collecting the residue in a 5-15 µm nylon
sieve
10- Making permanent Kerogen slides
11- Oxidation if necessary
12- Making permanent oxidized slides
Nalgene beakers
Brass sieve
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Microscopic examination of some slides
Try to recognize some pollen and spore specimens….
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Morphology of Embryophytic Spores
Trilete A spore with three laesurae (showing a trilete mark) Monolete A spore with a single laesura Alete A spore without a laesura
http://www.pollen.mtu.edu/glos-gtx/211G.GIF
http://www.pollen.mtu.edu/glos-gtx/332G.GIF
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Schematic drawings illustrate the basic morphologic features of a trilete spore (Modified from Singh, 1964)
Basic morphology of a monolete spore (http://www.ucl.ac.uk/GeolSci/micropal/spore.html)
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Dictyophyllidites harrisii Couper 1958 (After Volkheimer et al., 2007)
Commissure
Margo
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Spore Amb (outline)
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http://www.pollen.mtu.edu/glos-gtx/000G.GIF
Spore/Pollen Wall Stratification
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After Tschudy (1969)
Surface Sculpture of Spores
Psilate
Scabrate
Verrucate
Gemmate
Baculate
Clavate
Echinate
Reticulate
Foveolate
Striate
Rugulate
Cicatricose
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1- Spore type -Trilete - Monolete - Alete 2- Type of view - Polar (proximal – distal) - Equatorial 3- Amb - Circular - Triangular (straight – convex – concave) - Cingulate 4- Laesurae - Commissure (short – medium – long; reaching the equator) - Margo (present – absent) 5- Sculpture
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Deltoidospora
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Cicatricosisporites
(Nye et al., 2008)
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Cingutriletes
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Leptolepidites
Sculpture: Verrucate
(Nye et al., 2008)
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Gemmatriletes
Sculpture: Gemmate
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Nodosisporites
Sculpture: Baculate
(Perez Loinaze et al., 2012)
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http://www.gns.cri.nz/what/earthhist/fossils/spore_pollen/catalog/
Rugulatisporites
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http://www.gns.cri.nz/what/earthhist/fossils/spore_pollen/catalog/taxa/234.htm
Gleicheniidites
Exinal crassitude
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Crybelosporites
Perinate spore
Perine
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Laevigatosporites
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Morphology of Pollen Grains
1- Polarity
The Polar Axis is the straight line between the distal and proximal poles of a pollen grain or a spore Pollen grains can therefore be: A- Isopolar (the proximal and distal faces of the exine are alike) B- Heteropolar (the distal and proximal faces of the exine are different, either in shape, ornamentation or apertural system) C- Subisopolar (the proximal and distal faces are slightly different)
Illustrations from: http://www.pollen.mtu.edu/glos-gtx/glos-int.htm
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2- Symmetry
Spores and pollen are either symmetric or asymmetric Symmetric ones can be: A- Radially symmetric (with two or more vertical planes of symmetry) B- Bilaterally symmetric (with a single, principal plane of symmetry)
Illustrations from: http://www.pollen.mtu.edu/glos-gtx/glos-int.htm
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3- Shape
The shape of pollen grains and spores can be: A- Prolate (the polar axis is longer than the equatorial diameter) B- Oblate (the polar axis is shorter than the equatorial diameter) C- Spheroidal (the polar axis and the equatorial diameter are approximately equal)
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4- Aperture
- The aperture is a specialized thin region of the spore/pollen wall that is generally different in ornamentation and/or in structure - Apertures can be in the form of Pori (pores) or Colpi/Sulci (furrows) ● Grains with pori are called Porate ● Grains with colpi/sulci are called Colpate/Sulcate ● Grains with combined colpus and porus are called Colporate
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- Examples of apertures include: ● Monocolpate ● Monoporate ● Dicolpate ● Dicolporate ● Diporate ● Tricolpate ● Tricolporate ● Triporate
http://www.pollen.mtu.edu/glos-gtx/087G.GIF
http://www.pollen.mtu.edu/glos-gtx/330G.GIF
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Apertures situated only at the equator: ● Zonocolpate (Stephanocolpate) ● Zonocolporate (Stephanocolporate) ● Zonoporate (Stephanoporate) Apertures spread over the surface sometimes forming a regular pattern: ● Pantocolpate (Pericolpate) ● Pantocolporate (Pericolporate) ● Pantoporate (Periporate) ● Inaperturate ● Ulcerate (having an ill-defined pore in the polar area)
Illustrations from: http://www.pollen.mtu.edu/glos-gtx/glos-int.htm
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● Monosulcate ● Trichotomocolpate/Trichotomosulcate (having three-branched colpus/sulcus) ● Syncolpate (having two or more colpi the ends of which anastomose at the pole)
Illustrations from: http://www.pollen.mtu.edu/glos-gtx/glos-int.htm
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● Fenestrate (having large, window-like spaces lacking a tectum) ● Lophate (having a raised outer exine in a pattern of ridges (lophae) surrounding depressions (lacunae)) ● Heterocolpate (having both simple and compound colpi)
Lophae
Lacunae
Illustrations from: http://www.pollen.mtu.edu/glos-gtx/glos-int.htm
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Other pollen types: ● Saccate (having at least one saccus/vesicle/bladder/wing) A saccus is an expansion of the exine of a pollen grain that is at least partly filled with an alveolate infrastructure ● Polyplicate/Striate (having more than three meridional ridges (plicae) separated by deep grooves (striae))
Alveolate infrastructure
Illustrations from: http://www.pollen.mtu.edu/glos-gtx/glos-int.htm
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1- Polarity - Isopolar - Heteropolar - Subisopolar 2- Symmetry - Asymmetric - Radially symmetric - Bilaterally symmetric 3- Shape - Prolate - Oblate - Spheroidal 4- Type/Aperture - Monoporate - Bisaccate - Tricolpate, etc. 5- Sculpture
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Afropollis
(Doyle et al., 1982)
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Retimonocolpites
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Stellatopollis
(Dejax and Masure, 2005)
(Dejax and Masure, 2005)
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Cretacaeiporites
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Asteraceae
(Zobaa et al., 2011)
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Poaceae
(Joly et al., 2007)
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Elaterosporites
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Corollina
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Ephedripites
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Pinus
(http://jolisfukyu.tokai-sc.jaea.go.jp/fukyu/mirai-en/2007/2_5.html) (http://www.geo.arizona.edu/palynology/pid00005.html)
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Spores and Pollen as Paleoenvironmental Indicators
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Continental
Aeolian
Fluvial
Lacustrine
Alluvial
Transitional
Deltaic
Tidal
Lagoonal
Beach
Marine
Shallow marine
Deep marine
Reef
Sed
ime
nta
ry D
ep
osi
tio
nal
En
viro
nm
en
ts
Others
Evaporite
Glacial
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http://en.wikipedia.org/wiki/Sedimentary_depositional_environment
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References
Dejax, J. and Masure, E., 2005, Analyse palynologique de l’argile lignitifère à ambre de l’Albien terminal d’Archingeay (Charente-Maritime, France), Comptes Rendus Palevol, V. 4(1–2), p. 53-65 Doyle, J.A., Jardiné, S. and Doerenkamp, A., 1982, Afropollis, a new genus of early angiosperm pollen, with notes on the Cretaceous palynostratigraphy and palaeoenvironments of northern Gondwana. Bull. Cent. Rech. Expl.-Prod. Elf-Aquitaine, V. 6 (1), p. 39-117. Hyde, H. A. and Williams, D. W., 1944, Right word, Pollen Analysis Circular 8:6 Joly, C., Barillé, L., Barreau, M., Mancheron, A., Visset, L., 2007, Grain and annulus diameter as criteria for distinguishing pollen grains of cereals from wild grasses, Review of Palaeobotany and Palynology, V. 146(1–4), p. 221-233 Nye, E., Feist-Burkhardt, S., Horne, D. J., Ross, A. J. and Whittaker, J. E., 2008, The palaeoenvironment associated with a partial Iguanodon skeleton from the Upper Weald Clay (Barremian, Early Cretaceous) at Smokejacks Brickworks (Ockley, Surrey, UK), based on palynomorphs and ostracods, Cretaceous Research, V. 29 (3), p. 417-444 Perez Loinaze, V. S., Archangelsky, S. and Cladera, G., 2012, Palynostratigraphic study of the Early Cretaceous Río Mayer and Kachaike formations at the Quebrada El Moro Section, Austral Basin, southwestern Argentina, Cretaceous Research, V. 34, p. 161-171 Singh, C. 1964, Microflora of the Lower Cretaceous Mannville Group, East-Central Alberta, Alberta Res. Council, Bull. 15; 1–239 Tschudy, R. H., 1969, The plant kingdom and its palynological representation. Aspects of Palynology, Wiley-interscience, chapter 2, p. 5-34 58
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Zobaa, M. K., Oboh-Ikuenobe, F. E. and Rogers, J. D., 2009, Possible palynologic evidence of hurricanes in the New Orleans area during the past 4,500 years. AASP‒The Palynological Society, 42nd Annual Meeting, Kingsport, Tennessee, Abstract Volume, p. 39 Zobaa, M. K., Zavada, M. S., Whitelaw, M. J., Shunk, A. J. and Oboh-Ikuenobe, F. E., 2011, Palynology and palynofacies analyses of the Gray Fossil Site, eastern Tennessee: Their role in understanding the basin-fill history, Palaeogeography, Palaeoclimatology, Palaeoecology, V. 308; 433−444 http://www.geo.arizona.edu/palynology/ http://www.ucl.ac.uk/GeolSci/micropal/welcome.html http://www.pollen.mtu.edu/glos-gtx/glos-int.htm
References