CRC806-Database Data Feed (Atom) http://crc806db.uni-koeln.de/ Shallow hypersaline lakes as paleoclimate archives: A case study from the Laguna Salada Malaga province, southern Spain http://crc806db.uni-koeln.de/dataset/show/shallow-hypersaline-lakes-as-paleoclimate-archives-a-case-study-from-the-laguna-salada-m1526648152/ 2018-05-18T12:55:50+02:00 Although numerous studies concerning the Holocene climate of the southern Iberian Peninsula were accomplished within the last few decades, the climate history of this region is still poorly understood. Various studies deal with a combination of proxies, which are neither easy to compare nor is their connection easy to explain, e.g., due to spatial patterns and time transgression. Within this study, the suitability of the lacustrine sediments from the Laguna Salada (Andalucía region, southern Spain) as a paleoclimate archive is investigated. The lake sediments were evaluated using a multi-proxy approach including sedimentological, mineralogical, geochemical and biological analyses. The sediments reflect the evolution of the lake from pre-Medieval times onwards and Characeae as well as Ostracod analyses give an indication of paleosalinity. Moreover does the geochemical composition provide profound information concerning changes of elemental and mineralogical composition. Nevertheless, a robust, high-resolution chronology could not be achieved owed to the scarcity of material available for radiocarbon dating and contamination problems. Furthermore, poor preservation of pollen restricted the reconstruction of vegetation history, which could have complemented important information concerning climatic changes and human activity. Christian Willmes Palaeoenvironmental variabilities: A multi-proxy study of lacustrine sediments from salt lakes in the Antequera region (Andalusia), Southern Spain http://crc806db.uni-koeln.de/dataset/show/palaeoenvironmental-variabilities-a-multiproxy-study-of-lacustrine-sediments-from-salt-l1526647654/ 2018-05-18T12:47:32+02:00 Within the framework of the work of the Collaborative Research Centre 806 which investigates the history of the humankind, a multi-proxy analysis was applied on lacustrine sediments of Andalusia, Southern Spain. In this study different methods were applied on the sediments of the Laguna Dulce, Laguna Salada, Laguna de la Ratosa and the Laguna del Gosque to gain valuable information about past climate and environment, like the magnetic susceptibility, the X-ray fluorescence method and pollen analysis. Salt lakes constitute good archives of sediments and the south-western Mediterranean region represents an excellent site for palaeoclimate reconstruction. This and the proximity to archaeological sites on the Iberian Peninsula accounted for the selection of the research area, where variations of the past climate could be detected with the use of the geochemical and geophysical methods. The pollen analysis leads to interesting but unexpected results, which allowed no significant correlation with the indicated changes within the lacustrine sediments. Christian Willmes Lakustrine Sedimente der Laguna de Fuente de Piedra: Ein Vergleich von zwei RFA-Messgeräten mittels statistischer Parameter http://crc806db.uni-koeln.de/dataset/show/lakustrine-sedimente-der-laguna-de-fuente-de-piedra-ein-vergleich-von-zwei-rfamessgerten1526647368/ 2018-05-18T12:42:46+02:00 The geochemical element analysis is an important part of the examination of lacustrine sediments for paleoclimatic reconstructions. X-ray fluorescence analysis is thereby one of the most important methods. Generally, stationary measuring devices are used, but nowadays cost-effective, portable instruments are used more and more. Subject of this work is the comparison of the high-resolution stationary ITRAX core scanner with the portable, allterrain Niton XLt 700 series environmental analyzer. Lake sediments from Laguna de Fuente de Piedra (southern Spain) form the data basis. Statistical parameters were calculated from the results of both X-ray fluorescence analyses and used to compare the data. The examination of these results displays that the measured element concentrations of the two devices show significant differences, but nevertheless there is a good correlation of the data series. Christian Willmes Laguna Hondilla und Laguna de la Paja (Südspanien): Eine Paläoklimatische Betrachtung mittels multi-proxy Untersuchung http://crc806db.uni-koeln.de/dataset/show/laguna-hondilla-und-laguna-de-la-paja-sdspanien-eine-paloklimatische-betrachtung-mittels1526647119/ 2018-05-18T12:38:38+02:00 The Collaborative Research Centre 806 established by the universities of Cologne, Bonn and Aachen reconstructs climatic conditions on the Iberian Peninsula in the quaternary. Lake sediments are especially useful for these reconstructions because of their high-resolution, interruption-free record of the palaeoenvironment. This thesis therefore examines the lithological and geochemical composition of lake sediments from Laguna Hondilla and Laguna de la Paja, including sedimentological analysis as well as measurements of magnetic susceptibility and X-ray fluorescence. The evaluated results from Laguna de la Paja from magnetic susceptibility and from potassium, titan, vanadium, rubidium and calcium show chronological patterns with warm phases adjoined by gradual cooling, which is in turn followed by an abrupt increase in temperature and the repetition of this pattern. The results of Laguna Hondilla do not allow conclusions about the palaeoclimatic conditions. Christian Willmes Endorheische Becken in SW-Spanien: eine GIS-Vorerkundung zu weiterführenden Paläoumwelt-Studien http://crc806db.uni-koeln.de/dataset/show/endorheische-becken-in-swspanien-eine-gisvorerkundung-zu-weiterfhrenden-paloumweltstudie1526646882/ 2018-05-18T12:34:41+02:00 To understand paleoenvironment and its evolution, paleoenvironmental reconstruction is indispensable. Various climate archives containing data of several thousands of years allow conclusions about environmental conditions in prehistoric times. On the Iberian Peninsula such significant data can be found in lacustrine depositions in endorheic salt lakes. The Collaborative Research Centre 806 (CRC 806) established by the universities of Cologne, Bonn and Aachen examines the history and migration of humanity within the geoscientific and archeological project Our Way to Europe. Lacustrine core hole drilling in Spanish endorheic salt lakes is used to gain and evaluate sedimentary data. A GIS-based reconnaissance of those basins may achieve a quality improvement of sediment cores and the consequent paleoclimatic information. The potential drilling spots are supposed to be helpful suggestions and intend to optimize future field expeditions. Result of this work are drilling spots of the Spanish salt lakes Laguna de Medina, Laguna de Hondilla, Laguna del Pilón and the artificial desiccated Laguna de la Janda. Christian Willmes