ORCID Profile
0000-0001-5368-8011
Current Organisation
Goethe University Frankfurt
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Publisher: Elsevier BV
Date: 03-2016
Publisher: Public Library of Science (PLoS)
Date: 04-11-2014
Publisher: Proceedings of the National Academy of Sciences
Date: 23-07-2012
Abstract: Marked changes in human dispersal and development during the Middle to Upper Paleolithic transition have been attributed to massive volcanic eruption and/or severe climatic deterioration. We test this concept using records of volcanic ash layers of the C anian Ignimbrite eruption dated to ca. 40,000 y ago (40 ka B.P.). The distribution of the C anian Ignimbrite has been enhanced by the discovery of cryptotephra deposits (volcanic ash layers that are not visible to the naked eye) in archaeological cave sequences. They enable us to synchronize archaeological and paleoclimatic records through the period of transition from Neanderthal to the earliest anatomically modern human populations in Europe. Our results confirm that the combined effects of a major volcanic eruption and severe climatic cooling failed to have lasting impacts on Neanderthals or early modern humans in Europe. We infer that modern humans proved a greater competitive threat to indigenous populations than natural disasters.
Publisher: American Geophysical Union (AGU)
Date: 08-05-2010
DOI: 10.1029/2009TC002582
Publisher: American Geophysical Union (AGU)
Date: 09-2012
DOI: 10.1029/2012GC004183
Publisher: Elsevier BV
Date: 30-03-2009
Publisher: Elsevier BV
Date: 10-2012
Publisher: Mineralogical Society of America
Date: 10-2016
Publisher: Elsevier BV
Date: 2013
Publisher: Geological Society of London
Date: 2003
Publisher: Elsevier BV
Date: 2015
Publisher: American Association for the Advancement of Science (AAAS)
Date: 23-06-2000
DOI: 10.1126/SCIENCE.288.5474.2195
Abstract: The time scales over which deformation in the Earth's crust remains localized in shear zones are poorly known, as are the associated strain rates. We have determined the longevity and rates of deformation using rubidium-strontium (Rb-Sr) micros ling dating of increments of fibrous strain fringes from a Pyrenean shear zone. The fibers grew quasi-continuously through a protracted deformation history between 87 and 50 million years ago, over a period comparable to that of an orogeny. During a short interval between 66 and 62 million years, a rise in strain rate from 1.1 × 10 −15 to 7.7 × 10 −15 seconds −1 occurred. This acceleration correlates with an abrupt change in fiber-growth direction and a stress-field inversion from gravitational collapse to renewed horizontal crustal shortening.
Publisher: Elsevier BV
Date: 06-2012
Publisher: American Association for the Advancement of Science (AAAS)
Date: 26-05-2006
Abstract: Valley et al . review the lines of evidence on which we drew to conclude that continental crust formed much earlier than previously thought. Their comment contains some misrepresentations that we correct, but new information they provide appears to bolster our hypothesis. Nothing in their comment refutes the presence of continental crust or plate boundary processes prior to 4 billion years ago.
Publisher: Elsevier BV
Date: 12-2019
Publisher: Wiley
Date: 05-03-2018
DOI: 10.1111/GGR.12204
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B805995K
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 03-2016
Publisher: International Glaciological Society
Date: 2014
Abstract: In polar ice sheets, the average grain size varies with depth. Ice grain size increases due to several factors including ice temperature and impurity content, which in turn varies with climate. The effect of impurities on grain growth is thought to be crucial but has never been observed experimentally. Using a methodology recently developed at Royal Holloway University of London, in situ chemical analysis of frozen ice at sub-ppm concentrations with unprecedented spatial resolution (~150 μm) is achievable using ultraviolet laser ablation inductively coupled plasma mass spectrometry (UV-LA-ICPMS) featuring a two-volume cryo-LA-cell. Following surface cleaning with a custom-built vice equipped with a ceramic blade, NGRIP ice slabs (~86 ka before AD 2000) have been analysed using a series of one-dimensional profiles and two-dimensional maps of laser spots at a resolution of 200–300 μm. Results demonstrate that cation impurities are not uniformly distributed in ice layers and show significant variations in concentration on a sub-millimetre scale. Furthermore, a different pattern of elemental distribution between clear ice and layers enriched in impurities (cloudy bands) has been identified: while concentration differences for cloudy bands are not resolvable between boundaries and inner grain domains, within clear ice, grain boundaries and junctions are significantly (up to 100 times) impurity-enriched relative to corresponding grain interiors.
Publisher: Proceedings of the National Academy of Sciences
Date: 22-01-2018
Abstract: Reconstructing the degree of warming during geological periods of elevated CO 2 provides a way of testing our understanding of the Earth system and the accuracy of climate models. We present accurate estimates of tropical sea-surface temperatures (SST) and seawater chemistry during the Eocene (56–34 Ma before present, CO 2 ppm). This latter dataset enables us to reinterpret a large amount of existing proxy data. We find that tropical SST are characterized by a modest warming in response to CO 2 . Coupling these data to a conservative estimate of high-latitude warming demonstrates that most climate simulations do not capture the degree of Eocene polar lification.
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3JA50053E
Publisher: Cambridge University Press (CUP)
Date: 2004
DOI: 10.1017/S1473550404001648
Abstract: March 28, 2004–April 1, 2004 NASA Ames Research Center, Moffett Field, CA, USA
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 05-2003
Publisher: Elsevier BV
Date: 06-2019
Publisher: American Geophysical Union (AGU)
Date: 12-2017
DOI: 10.1002/2017PA003155
Publisher: CSIRO Publishing
Date: 2005
DOI: 10.1071/MF04184
Abstract: Otoliths preserve a continuous geochemical record of its life history, from the earliest natal stage through to adulthood. Using in situ laser ablation (UV) multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) measurements of Sr isotopic compositions together with elemental abundances (Ca, Sr, Ba and Mg), we show how it is possible to characterise the various types of habitats encountered throughout the lifecycle history of in idual barramundi. Unlike trace element concentrations, which can be modulated by physiological processes, Sr isotopic compositions of otoliths provide a direct fingerprint of the water mass in which the fish lived. Elemental abundances, in particular Sr/Ba ratios are, however, shown to be especially sensitive to transitional environments, such as estuaries. The flexibility of the barramundi’s life history is confirmed by the present study, with the existence of both marine and freshwater nurseries, with some in iduals spending their entire life cycle in fresh water, some entirely in marine and others moving between freshwater estuarine and marine habitats.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 23-12-2005
Abstract: The long-favored paradigm for the development of continental crust is one of progressive growth beginning at ∼4 billion years ago (Ga). To test this hypothesis, we measured initial 176 Hf/ 177 Hf values of 4.01- to 4.37-Ga detrital zircons from Jack Hills, Western Australia. ϵ Hf (deviations of 176 Hf/ 177 Hf from bulk Earth in parts per 10 4 ) values show large positive and negative deviations from those of the bulk Earth. Negative values indicate the development of a Lu/Hf reservoir that is consistent with the formation of continental crust (Lu/Hf ≈ 0.01), perhaps as early as 4.5 Ga. Positive ϵ Hf deviations require early and likely widespread depletion of the upper mantle. These results support the view that continental crust had formed by 4.4 to 4.5 Ga and was rapidly recycled into the mantle.
Publisher: Frontiers Media SA
Date: 04-10-2019
Abstract: Two species of Amphistegina were cultured under four variable DIC concentrations (2340–2570 μM). The variability of trace elements within the foraminiferal shells was measured in the knob area of three in iduals for each DIC treatment using LA-ICPMS. In in iduals that showed significant growth (identified via 135 Ba-enriched seawater), B, Na, and Sr showed an increase with DIC, while K and Mg were slightly lower or unchanged. Sharp transition zones between natural 135 Ba and the ∼10-fold increased 135 Ba in the shells represent one quarter of a new additional chamber, which occurs roughly once a week. The shape of the transition zone is best described by a logistic equation for population growth. We propose that this reflects the dynamics of seawater vacuoles that serve the biomineralization process and provide Ca and DIC for calcification of Amphistegina as described in previous publications (e.g., Bentov et al., 2009 ). LA-ICPMS profiles in the central knob (∼70 μm depth) also revealed previously described cyclical changes in concentration of Mg, each apparently representing a growth of a new chamber. Additional elements such as K, Na and U showed similar cycles with the same frequency and phase as the Mg cycles. Sr showed variability with similar frequency but not in-phase to those of the Mg. These multi-element cycles were found both in the newly grown calcite (elevated- 135 Ba) and in the natural skeleton regardless of the DIC treatments. These high Mg and multi-element cycles seem to be an essential part of the calcification process. They may originate from the interaction with the organic matrix resulting in elevated Mg and other elements in primary calcite while secondary calcite of the lamination process shows lower concentrations. It is also possible that primary calcite is enriched in trace elements if an Amorphous CaCO 3 (ACC) or vaterite precursors are involved. In addition, Rayleigh fractionation from a semi-closed reservoir, the presence of high Mg in the lattice or any combination of the previous causes may explain the trace elements enrichment. Changes in the DIC did not affect the pattern of elemental cycles in these foraminifera, suggesting that this variability is inherent to the biomineralization process.
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 09-2013
Publisher: American Geophysical Union (AGU)
Date: 10-11-2012
DOI: 10.1029/2012PA002315
Publisher: No publisher found
Date: 2006
Publisher: Springer Science and Business Media LLC
Date: 23-01-2022
Publisher: Springer Science and Business Media LLC
Date: 16-01-2023
Publisher: Elsevier BV
Date: 10-2013
Publisher: Elsevier BV
Date: 08-2000
Publisher: Springer International Publishing
Date: 2021
Publisher: Springer Science and Business Media LLC
Date: 10-2002
Publisher: Society for Sedimentary Geology
Date: 23-02-2015
Publisher: Elsevier BV
Date: 11-2015
Publisher: Elsevier BV
Date: 02-2003
Publisher: Elsevier BV
Date: 11-2013
Publisher: Springer Science and Business Media LLC
Date: 08-2001
Publisher: Wiley
Date: 08-2014
DOI: 10.1002/JQS.2734
Publisher: Copernicus GmbH
Date: 31-05-2017
Abstract: Abstract. Several abrupt shifts from periods of extreme cold (Greenland stadials, GS) to relatively warmer conditions (Greenland interstadials, GI) called Dansgaard–Oeschger events are recorded in the Greenland ice cores. Using cryo-cell UV-laser-ablation inductively coupled-plasma mass spectrometry (UV-LA-ICPMS), we analysed a 2.85 m NGRIP ice core section (2691.50–2688.65 m depth, age interval 84.86–85.09 ka b2k, thus covering ∼ 230 years) across the transitions of GI-21.2, a short-lived interstadial prior to interstadial GI-21.1. GI-21.2 is a ∼ 100-year long period with δ18O values 3–4 ‰ higher than the following ∼ 200 years of stadial conditions (GS-21.2), which precede the major GI-21.1 warming. We report concentrations of major elements indicative of dust and/or sea salt (Na, Fe, Al, Ca, Mg) at a spatial resolution of ∼ 200 µm, while maintaining detection limits in the low-ppb range, thereby achieving sub-annual time resolution even in deep NGRIP ice. We present an improved external calibration and quantification procedure using a set of five ice standards made from aqueous (international) standard solutions. Our results show that element concentrations decrease drastically (more than 10-fold) at the warming onset of GI-21.2 at the scale of a single year, followed by relatively low concentrations characterizing the interstadial part before gradually reaching again typical stadial values.
Publisher: Elsevier BV
Date: 06-2014
Publisher: Springer Science and Business Media LLC
Date: 25-06-2020
DOI: 10.1038/S41598-020-67017-2
Abstract: Mobility of people and goods during the Upper Paleolithic has proven difficult to reconstruct given the relative rareness of remains. Nevertheless, archaeological contexts like the Late Pleistocene horizon of Borsuka Cave (Southern Poland) represent a unique opportunity to explore patterns of objects’ transportation across Central Europe. We investigated the origin of four ornaments made of European elk ( Alces alces L.) incisors recovered at Borsuka Cave – the oldest known burial site in Poland, possibly a child grave. Laser-ablation plasma source mass spectrometric analyses of trace elements and Sr isotopic compositions revealed that one elk was roaming within a geologically uniform area while the others changed their pastures during their lifetimes. The non-local origin of the elk teeth is inferred from their exotic Sr isotopic compositions and the lack of evidence for the presence of elk in this territory during the Pleistocene. Instead, the elks’ Sr isotopic composition show good agreement with sites near the Austria-Slovakia border region and northern Hungary, ~250 km away from the study site. We argue that the artefacts were most likely brought to Borsuka Cave by humans or by a network of exchange, so far never reported in the time range 32.5–28.8 ka cal BP for Southern Poland.
Publisher: Public Library of Science (PLoS)
Date: 11-06-2013
Publisher: Copernicus GmbH
Date: 06-04-2016
Abstract: Abstract. Much of our knowledge of past ocean temperatures comes from the foraminifera Mg / Ca palaeothermometer. Several nonthermal controls on foraminifera Mg incorporation have been identified, of which vital effects, salinity, and secular variation in seawater Mg / Ca are the most commonly considered. Ocean carbonate chemistry is also known to influence Mg / Ca, yet this is rarely examined as a source of uncertainty, either because (1) precise pH and [CO32−] reconstructions are sparse or (2) it is not clear from existing culture studies how a correction should be applied. We present new culture data of the relationship between carbonate chemistry and Mg / Ca for the surface-dwelling planktic species Globigerinoides ruber and compare our results to data compiled from existing studies. We find a coherent relationship between Mg / Ca and the carbonate system and argue that pH rather than [CO32−] is likely to be the dominant control. Applying these new calibrations to data sets for the Paleocene–Eocene Thermal Maximum (PETM) and Eocene–Oligocene transition (EOT) enables us to produce a more accurate picture of surface hydrology change for the former and a reassessment of the amount of subtropical precursor cooling for the latter. We show that pH-adjusted Mg / Ca and δ18O data sets for the PETM are within error of no salinity change and that the amount of precursor cooling over the EOT has been previously underestimated by ∼ 2 °C based on Mg / Ca. Finally, we present new laser-ablation data of EOT-age Turborotalia liapertura from St. Stephens Quarry (Alabama), for which a solution inductively coupled plasma mass spectrometry (ICPMS) Mg / Ca record is available (Wade et al., 2012). We show that the two data sets are in excellent agreement, demonstrating that fossil solution and laser-ablation data may be directly comparable. Together with an advancing understanding of the effect of Mg / Casw, the coherent picture of the relationship between Mg / Ca and pH that we outline here represents a step towards producing accurate and quantitative palaeotemperatures using this proxy.
Publisher: Elsevier BV
Date: 03-2017
Publisher: Proceedings of the National Academy of Sciences
Date: 02-11-2020
Abstract: The extent to which Neanderthals differ from us is the focus of many studies in human evolution. There is debate about their pace of growth and early-life metabolic constraints, both of which are still poorly understood. Here we use chemical and isotopic patterns in tandem with enamel growth rates of three Neanderthal milk teeth from northeastern Italy to explore the early life of these in iduals. Our study shows that these Neanderthals started to wean children at 5 to 6 months, akin to modern humans, implying similar energy demands during early infancy. Dental growth rates confirm this and follow trajectories comparable with modern humans. Contrary to previous evidence, we suggest that differences in weaning age did not contribute to Neanderthals’ demise.
Publisher: Elsevier BV
Date: 05-2017
Publisher: Elsevier BV
Date: 06-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1JA10242G
Publisher: Wiley
Date: 14-11-2016
DOI: 10.1111/TER.12184
Publisher: Mary Ann Liebert Inc
Date: 09-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5JA00311C
Abstract: Accurate in situ Sr isotope analysis of (bio)apatite via ‘robust-plasma’ laser-ablation MC-ICPMS with negligible 40 Ca 31 P 16 O and reliable 87 Rb interference correction.
Publisher: Elsevier BV
Date: 12-2010
Publisher: Elsevier BV
Date: 03-2014
Publisher: Geological Society of London
Date: 03-1999
Publisher: Elsevier BV
Date: 2004
Publisher: American Geophysical Union (AGU)
Date: 08-2015
DOI: 10.1002/2015GC005822
Publisher: Springer Science and Business Media LLC
Date: 27-02-2015
DOI: 10.1038/NCOMMS7344
Abstract: The European Alps are an effective barrier for meridional moisture transport and are thus uniquely placed to record shifts in the North Atlantic storm track pattern associated with the waxing and waning of Late-Pleistocene Northern Hemisphere ice sheets. The lack of well-dated terrestrial proxy records spanning this time period, however, renders the reconstruction of past atmospheric patterns difficult. Here we present a precisely dated, continuous terrestrial record of meteoric precipitation in Europe between 30 and 14.7 ka. In contrast to present-day conditions, our speleothem data provide strong evidence for preferential advection of moisture from the South across the Alps supporting a southward shift of the storm track during the local Last Glacial Maximum (that is, 26.5–23.5 ka). Moreover, our age control indicates that this circulation pattern preceded the Northern Hemisphere precession maximum by ~3 ka, suggesting that obliquity may have played a considerable role in the Alpine ice aggradation.
Publisher: Elsevier BV
Date: 09-2015
Publisher: American Association for the Advancement of Science (AAAS)
Date: 31-10-2003
Abstract: The Alpine Iceman provides a unique window into the Neolithic-Copper Age of Europe. We compared the radiogenic (strontium and lead) and stable (oxygen and carbon) isotope composition of the Iceman's teeth and bones, as well as 40 Ar/ 39 Ar mica ages from his intestine, to local geology and hydrology, and we inferred his habitat and range from childhood to adult life. The Iceman's origin can be restricted to a few valleys within ∼60 kilometers south(east) of the discovery site. His migration during adulthood is indicated by contrasting isotopic compositions of enamel, bones, and intestinal content. This demonstrates that the Alpine valleys of central Europe were permanently inhabited during the terminal Neolithic.
Publisher: Springer Science and Business Media LLC
Date: 08-2001
Publisher: Elsevier BV
Date: 05-2012
Publisher: Elsevier BV
Date: 2017
Publisher: Mary Ann Liebert Inc
Date: 12-2012
Publisher: MDPI AG
Date: 27-06-2018
DOI: 10.3390/MA11071091
Publisher: Society for Sedimentary Geology
Date: 23-02-2015
Publisher: Informa UK Limited
Date: 13-05-2020
Publisher: Elsevier BV
Date: 03-2016
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Wolfgang Müller.