Investigations of the geomorphologic and pedologic system of sedimentary vega deposits from Lanzarote (Canary Islands) supported by luminescence dating [Elektronische Ressource] : important steps towards their palaeoclimatic interpretation / vorgelegt von Hans von Suchodoletz

Hans Von Suchodoletz

Informations

• Publié par: universitat_bayreuth
• Publié le: 01 janvier 2007
• Nombre de lectures: 20
• Langue: Deutsch
• Poids de l'ouvrage: 7 Mo

Extrait

summary

Investigations of the geomorphologic and pedologic system
of sedimentary vega deposits from Lanzarote (Canary
Islands) supported by luminescence dating – important
steps towards their palaeoclimatic interpretation




Dissertation
zur Erlangung des Grades
Doktor der Naturwissenschaften
(Dr. rer. nat.)
an der
Fakultät für Biologie, Chemie und Geowissenschaften
an der Universität Bayreuth



vorgelegt von

Hans von Suchodoletz
(Diplom-Geograph)
geb. am 20. 05. 1975 in Greifswald

Erstgutachter: Prof. Dr. Ludwig Zöller

Bayreuth, im August 2007
1summary

Die vorliegende Arbeit wurde in der Zeit von September 2003 bis August 2007 in
Bayreuth am Lehrstuhl Geomorphologie unter der Betreuung von Herrn Prof. Dr.
Ludwig Zöller, sowie am Geoforschungszentrum Potsdam unter der Betreuung von
PD Dr. H. Oberhänsli angefertigt.


Vollständiger Abdruck der von der Fakultät für Biologie, Chemie und
Geowissenschaften der Universität Bayreuth genehmigten Dissertation zur Erlangung
des Grades eines Doktors der Naturwissenschaften (Dr. rer. nat.).




















Dissertation eingereicht 10.08.2007

Tag des wissenschaftlichen Kolloquiums 30.04.2008

Amtierender Dekan: Prof. Axel Müller



Prüfungsausschuss

Erstgutachter: Prof. Dr. L. Zöller
Zweitgutachterin: PD Dr. H. Oberhänsli
Vorsitz: Prof. Dr. K. Hüser
Kommissionsmitglieder PD Dr. B. Glaser
Prof. Dr. K. Bitzer

2summary
Contents

Contents.................................................................................................................................................. 3
List of Tables.......................................................................................................................................... 5
List of Figures ........................................................................................................................................ 6
List of abbreviations.............................................................................................................................. 8
Summary ................................................................................................................................................ 9
Zusammenfassung............... 11
1. Introduction..................... 13
2. Location and studied sites............................................................................................................... 18
2.1. Location .................................................................................................................................... 18
2.1.1. Geology 18
2.1.2. Geomorphology.................................................................................................................. 18
2.1.3. Present climate................................................................................................................... 19
2.1.4. Vegetation .......................................................................................................................... 19
2.2. Studied sites .............................................................................................................................. 20
2.2.1. Vega of Femés.................................................................................................................... 20
2.2.2f Guatiza 21
2.2.3. Vega of Teguise 21
3. Material and methods ..................................................................................................................... 22
3.1. Material...... 22
3.2. Methods..................................................................................................................................... 22
3.2.1. GIS calculations of surface areas ..................................................................................... 22
3.2.2. Grain size analyses............................................................................................................. 22
3.2.3. X-ray diffraction (XRD) analyses...................................................................................... 23
3.2.5. Rock magnetism................................................................................................................. 27
3.2.6. Micromorphology .............................................................................................................. 27
3.2.7. Soil analytics ...................................................................................................................... 27
4. Results .............................................................................................................................................. 29
4.1. Stratigraphy.............................................................................................................................. 29
4.1.1. Profile of Femés 29
4.1.2. Profile of Guatiza III ......................................................................................................... 30
4.1.3of Teguise 30
4.2. Dating Saharan dust deposits on Lanzarote (Canary Islands) by luminescence dating
techniques and their implication for palaeoclimate reconstruction of NW Africa ................... 32
4.2.1. Introduction ....................................................................................................................... 32
4.2.2. Study area........................................................................................................................... 34
4.2.3. Studied sites........................................................................................................................ 35
4.2.4. Methods 38
4.2.4.1. Sample preparation ..................................................................................................... 38
4.2.4.2. Measurements.............................................................................................................. 38
4.2.4.3. Dose rate determination.............................................................................................. 40
4.2.4.4. Water content 40
4.2.4.5. Age calculation............................................................................................................ 42
4.2.5. Results ................................................................................................................................ 44
4.2.5.1. Dose rates.................................................................................................................... 44
4.2.5.2. Equivalent doses.......................................................................................................... 45
4.2.6. Discussion .......................................................................................................................... 48
4.2.6.1. Reliability of different luminescence methods............................................................. 48
4.2.6.2. Establishing a chronostratigraphy.............................................................................. 52
3summary
4.2.7. Conclusions........................................................................................................................ 56
4.2.8. Acknowledgements............................................................................................................. 56
4.3. Luminescence bleaching characteristics of Saharan dust – A case study from Lanzarote,
Canary Islands (Spain) ................................................................................................................... 57
4.3.1. Introduction ....................................................................................................................... 57
4.3.2. Regional setting ................................................................................................................. 58
4.3.3. Material.............................................................................................................................. 60
4.3.4. Methods 61
4.3.4.1. Microscopy.................................................................................................................. 61
4.3.4.2. Luminescence measurements ...................................................................................... 62
4.3.5. Results ................................................................................................................................ 63
4.3.5.1. Microscopy 63
4.3.5.2. Luminescence measurements 64
4.3.6. Discussion .......................................................................................................................... 66
4.3.7. Conclusions........................................................................................................................ 68
4.3.8. Acknowledgements............................................................................................................. 69
4.5.2. Geographic setting............................................................................................................ 93
4.5.7. Conclusions.................................................................