A5024752693- Geological and Geochemical Analysis
- Astro and Planetary Science
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Planetary Science and Exploration
- Geology and Paleoclimatology Research
- Radioactive element chemistry and processing
- Geochemistry and Elemental Analysis
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Geomagnetism and Paleomagnetism Studies
- Nuclear Physics and Applications
- Radioactive contamination and transfer
- Space Exploration and Technology
- Geological Studies and Exploration
- Marine and environmental studies
- Mineralogy and Gemology Studies
- Archaeology and ancient environmental studies
- Groundwater and Isotope Geochemistry
- Geological and Geophysical Studies
- Astronomical and nuclear sciences
- Radioactive Decay and Measurement Techniques
- Scientific Research and Discoveries
- Image Processing and 3D Reconstruction
University of Münster
2015-2024
Institute of Mineralogy
2015
Max Planck Institute for Chemistry
2006
University of California, Santa Cruz
1997-2000
University of Massachusetts Amherst
1999
Colgate University
1999
Well-defined constants of radioactive decay are the cornerstone geochronology and use radiogenic isotopes to constrain time scales mechanisms planetary differentiation. Four new determinations lutetium-176 constant (lambda176Lu) made by calibration against uranium-lead schemes yield a mean value 1.865 +/- 0.015 x 10(-11) year(-1), in agreement with two most recent decay-counting experiments. Lutetium-hafnium ages that based on previously used lambda176Lu 1.93 1.94 year(-1) thus approximately...
The application of multiple collector inductively coupled plasma source mass spectrometry (MC‐ICPMS) to 176 Lu‐ Hf and 92 Nb‐ Zr chronometry has been hampered by complex Zr‐Hf purification procedures that involve ion exchange column steps. This study presents a single‐column separation procedure for Lu using Eichrom® Ln‐Spec resin. sample is loaded in pure HCl, element yields are not dependent on the matrix. For chronometry, one‐column Biorad® AG‐1‐× 8 resin described. Titanium Mo completely...
Research Article| February 01, 2007 Zircon as a Monitor of Crustal Growth Erik E. Scherer; Scherer 1Institut für Mineralogie, Universität Münster, 48149 Germany Search for other works by this author on: GSW Google Scholar Martin J. Whitehouse; Whitehouse 2Laboratory Isotope Geology, Swedish Museum Natural History, SE-104 05 Stockholm, Sweden Carsten Münker 3Mineralogisch-Petrologisches Institut, Bonn, 53115 Elements (2007) 3 (1): 19–24. https://doi.org/10.2113/gselements.3.1.19 Article...
The Rb–Sr decay system is one of the most widely used geochronometers for obtaining ages and cooling rates terrestrial magmatic, metamorphic, hydrothermal events. It has also been extensively applied to date extraterrestrial, early solar accuracy ages, however, strongly depends on 87Rb constant (λ87Rb). We determined λ87Rb relative constants 235U 238U by comparing minerals with U–Pb obtained from same intrusion. Comparison emplacement high-precision mineral three rapidly cooled igneous rocks...
Research Article| December 01, 2013 Garnet Geochronology: Timekeeper of Tectonometamorphic Processes Ethan F. Baxter; Baxter 1Department Earth & Environment, Boston University685 Commonwealth Avenue, Boston, MA 02215, USAE-mail: efb@bu.edu Search for other works by this author on: GSW Google Scholar Erik E. Scherer 2Institut für Mineralogie, Westfälische Wilhelms-Universität MünsterCorrenstr. 24, 48149 Münster, GermanyE-mail: escherer@uni-muenster.de Author and Article Information Publisher:...
Abstract Incorporation of rare earth elements (REE) in garnet enables chronology (Sm‐Nd, Lu‐Hf), and imparts a garnet‐stable signature on cogenetic phases, which allows petrochronology general petrogenetic tracing stability minerals melts. Constraints the uptake redistribution mechanisms, as well diffusive behaviour REE are required for allowing accurate interpretation signatures ages. Garnet profiles often measured to gain insight into nature cause zoning. Interpretation such is...
Research Article| March 01, 2003 Evidence for a Neoproterozoic ocean in south-central Africa from mid-oceanic-ridge–type geochemical signatures and pressure-temperature estimates of Zambian eclogites Timm John; John 1Institut für Geowissenschaften, Universität Kiel, Olshausenstrasse 40, 24098 Germany, Institut Mineralogie, Münster, Corrensstrasse 24, 48149 Germany Search other works by this author on: GSW Google Scholar Volker Schenk; Schenk 2Institut Karsten Haase; Haase Erik Scherer;...
The application of the Hf isotope composition zircon as a geochemical tracer requires preservation Lu-Hf systematics within individual grains. We performed hydrothermal experiments on self-irradiation-damaged to test whether alteration would affect its isotopic composition. Severely radiation-damaged from Sri Lanka was reacted in either Teflon reactors or gold capsules at 200 °C (1080 h, autogeneous pressure), 400 (120 1 kbar), and 600 (72 kbar) M HCl-0.2 HF solution that spiked with 300 ppm...
Nucleosynthetic heterogeneity and secondary neutron capture reactions may have important implications for 176Lu–176Hf chronology modelling of early planetary evolution. So far, the relevance these phenomena Lu–Hf system has not been explored. We therefore analyzed non-radiogenic stable Hf-isotope composition (177Hf, 178Hf, 179Hf, 180Hf) meteorites, meteorite components, terrestrial rock samples to identify nucleosynthetic or capture-induced variations. All chondrites uniform 178Hf/177Hf...
The thermal structure of subduction zones exerts a major influence on deep-seated mechanical and chemical processes controlling arc magmatism, seismicity, global element cycles. Accretionary complexes exposed inland may comprise tectonic blocks with contrasting pressure–temperature (P–T) histories, making it possible to investigate the dynamics evolution former interfaces. With this aim, we present new Lu–Hf geochronological results for mafic rocks Halilbağı Complex (Anatolia) that evolved...
The Qinling–Dabie–Sulu orogenic belt in eastern China is one of the largest ultrahigh-pressure (UHP) terranes worldwide. Mineral Sm–Nd- and zircon U–Pb dating has been widely used to reveal metamorphic history this collisional orogen. However, exact timing UHP event(s) remains controversial ages ranging from 245 Ma 220 have suggested. We present high precision garnet–cpx Lu–Hf for six eclogites Dabie Sulu areas. All fall a narrow range between 219.6 224.4 Ma. Five samples define mean age...
We present an effective chemical separation technique for Lu–Hf geochronology on small samples (sub-ng range Hf) and precise <sup>176</sup>Hf/<sup>177</sup>Hf analysis.