A5043809088- Geological and Geochemical Analysis
- Astro and Planetary Science
- Geology and Paleoclimatology Research
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Geochemistry and Elemental Analysis
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- Geomagnetism and Paleomagnetism Studies
- Astronomical and nuclear sciences
- Archaeology and ancient environmental studies
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Radioactive element chemistry and processing
- Silicon Effects in Agriculture
- Radioactive contamination and transfer
- Space Exploration and Technology
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies Worldwide
- Stellar, planetary, and galactic studies
- Geological and Geophysical Studies
- Geological Studies and Exploration
- Ancient and Medieval Archaeology Studies
Aarhus University
2011-2024
Aarhus GeoSoftware (Denmark)
2022
University of Houston
2012-2019
Imperial College London
2009-2017
Dartmouth College
2004-2009
University of Copenhagen
2004
Dartmouth Hospital
2004
The application of 87Sr/86Sr in prehistoric mobility studies requires accurate strontium reference maps. These are often based from present-day surface waters. However, the use agricultural lime low to noncalcareous soils can substantially change compositions Water unaffected by agriculture western Denmark has an average ratio 0.7124 as compared 0.7097 water nearby farmland. obtained samples over 1.5 km along a stream, which originates forest and flows through lime-treated farmland,...
The timing and nature of igneous activity recorded at a single Mars ejection site can be determined from the isotope analyses Martian meteorites. Northwest Africa (NWA) 7635 has an Sm-Nd crystallization age 2.403 ± 0.140 billion years, data indicate that it is derived incompatible trace element-depleted mantle source similar to which produced geochemically distinct group 327- 574-million-year-old "depleted" shergottites. Cosmogenic nuclide demonstrate NWA was ejected 1.1 million years ago...
Bulk carbonaceous chondrites display a deficit of approximately 100 parts per million (ppm) in 144Sm with respect to other meteorites and terrestrial standards, leading decrease their 142Nd/144Nd ratios by 11 ppm. The data require that samarium neodymium isotopes produced the p process associated photodisintegration reactions supernovae were heterogeneously distributed solar nebula. Other rapid neutron capture (r process) slow (s red giants homogeneously distributed. sources supplying p-...
High-precision barium isotopic compositions of large samples an ordinary chondrite and a eucrite are identical to the terrestrial values. In contrast, carbonaceous chondrites reveal excesses in 135Ba 137Ba around +39 +22 parts per million (ppm), respectively; no anomalies resolvable 130,132,138Ba. Sr all meteorites within error. The data consistent with having excess r-process 135,137Ba respect Earth, parent bodies, chondrites. chondrites, however, display variation r- s-process Sm Nd...
Abstract. Injection of basaltic magmas into silicic crustal holding chambers and subsequent magma mingling or mixing is a process that has been recognised since the late seventies as resulting in explosive eruptions. Detailed reconstruction assessment caused by such intrusion now possible because exceptional time-sequence sample suite available from tephra fallout 2010 summit eruption at Eyjafjallajökull volcano South Iceland. Fallout 14 to 19 April contains three glass types basaltic,...
Zinc isotope compositions (δ66Zn) and concentrations were determined for metal samples of 15 iron meteorites across groups IAB, IIAB, IIIAB. Also analyzed troilite other inclusions from the IAB Toluca. Furthermore, first Zn data are presented metal–silicate partitioning experiments that conducted at 1.5 GPa 1650 K. Three with run durations between 10 60 min provide consistent partition coefficients ∼0.7 indicate fractionation molten silicate is either small (at less than about ±0.2‰) or...
Laser ablation multi‐collector mass spectrometry (LA‐MC‐ICP‐MS) has emerged as the technique of choice for in situ measurements Sr isotopes geological minerals. However, method poses analytical challenges and there is no widely adopted standardised approach to collecting these data or correcting numerous potential isobaric inferences. Here, we outline practical procedures reduction strategies help establish a consistent framework isotope materials by LA‐MC‐ICP‐MS. We characterise new set...
The aim of this study was to analyse arsenic (As) transformation and biosorption by indigenous As‐resistant bacteria both in planktonic biofilm modes growth. were isolated from industrial waste water strain PT2, identified as Exiguobacterium profundum through 16S rRNA gene sequencing selected for further study. As E. profundumPT2 determined HPLC‐ICP‐MS analysis. Planktonic cultures reduced 3·73 mmol l−1 As5+ into As3+ artificial effluent after 48‐h incubation. In case biosorption, biofilms...
Abstract New Tl, Pb, and Cd concentration Pb isotope data are presented for enstatite as well L‐ LL ‐type ordinary chondrites, with additional stable results the former. All three chondrite suites have Tl contents that vary by more than 1–2 orders of magnitude but concentrations uniform, a result terrestrial contamination. Model calculations based on compositions indicate half samples, 50% measured due to addition modern Pb. In part, this is responsible relatively young imprecise Pb‐Pb ages...
The use of strontium isotopes in pre-historic mobility studies requires accurate isoscapes for evaluating whether individuals are local to the areas which they were buried or not. Isoscapes often based on modern-day samples, commonly surface waters. There is, however, growing evidence that farming has a significant impact isotopic composition waters and farmed soils, mainly due agricultural lime soil improvement. In this paper, we investigate fate from an experimentally-manipulated field...
Abstract We investigate the shallow plumbing system of Deccan Traps Large Igneous Province using rock and mineral data from Giant Plagioclase Basalt (GPB) lava flows around entire province, but with a focus on Saurashtra Peninsula, Malwa Plateau, base top Western Ghats (WG) pile. GPB lavas in WG typically occur at transition between chemically distinct basalt formations. Most samples are evolved basalts, high Fe Ti contents, show major trace elements Sr-Nd-Pb isotopic compositions generally...
Increasingly, strontium (Sr) isotopes are used to distinguish locals and migrants in prehistoric studies, by measuring 87 Sr/ 86 Sr human remains comparing these values the distribution of bioavailable study area, often surface water. However, it has recently been shown that agricultural lime can have a substantial impact on ratio concentration water areas where soils low- non-calcareous. Agricultural is rich with low ratios, such interpretations migration based waters affected overestimate...