Search Results - "Wieler, R."

Late formation and prolonged differentiation of the Moon inferred from W isotopes in lunar metals by TOUBOUL, M, KLEINE, T, BOURDON, B, PALME, H, WIELER, R

“…The Moon is thought to have formed from debris ejected by a giant impact with the early 'proto'-Earth and, as a result of the high energies involved, the Moon…”
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On the origin and composition of Theia: Constraints from new models of the Giant Impact by Meier, M.M.M., Reufer, A., Wieler, R.

“…•We calculate the allowed range in isotopic composition for Theia.•A carbonaceous chondritic or Mars-like Theia is marginally possible in a few cases.•The…”
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Cosmic‐ray exposure ages of six chondritic Almahata Sitta fragments by Riebe, M. E. I., Welten, K. C., Meier, M. M. M., Wieler, R., Barth, M. I. F., Ward, D., Laubenstein, M., Bischoff, A., Caffee, M. W., Nishiizumi, K., Busemann, H.

“…The Almahata Sitta strewn field is dominated by ureilites, but contains a large fraction of chondritic fragments of various types. We analyzed stable isotopes…”
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Denudation rates and a topography-driven rainfall threshold in northern Chile: Multiple cosmogenic nuclide data and sediment yield budgets by Kober, F., Ivy-Ochs, S., Schlunegger, F., Baur, H., Kubik, P.W., Wieler, R.

“…The quantification of geomorphic process rates on the outcrop- and the orogen-scale is important to describe accurately the interaction between the relative…”
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Noble gases in 18 Martian meteorites and angrite Northwest Africa 7812-Exposure ages, trapped gases, and a re-evaluation of the evidence for solar cosmic ray-produced neon in shergottites and other achondrites by Wieler, R., Huber, L., Busemann, H., Seiler, S., Leya, I., Maden, C., Masarik, J., Meier, M. M. M., Nagao, K., Trappitsch, R., Irving, A. J.

“…We present noble gas data for 16 shergottites, 2 nakhlites (NWA 5790, NWA 10153), and 1 angrite (NWA 7812). Noble gas exposure ages of the shergottites fall in…”
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Effects of aqueous alteration on primordial noble gases and presolar SiC in the carbonaceous chondrite Tagish Lake by Riebe, M. E. I., Busemann, H., Alexander, C. M. O'D., Nittler, L. R., Herd, C. D. K., Maden, C., Wang, J., Wieler, R.

“…Effects of aqueous alteration on primordial noble gas carriers were investigated by analyzing noble gases and determining presolar SiC abundances in insoluble…”
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High early solar activity inferred from helium and neon excesses in the oldest meteorite inclusions by Kööp, L., Heck, P. R., Busemann, H., Davis, A. M., Greer, J., Maden, C., Meier, M. M. M., Wieler, R.

“…Astronomical observations show that early in their evolution, stars experience stages of high activity associated with enhanced energetic particle fluxes 1 …”
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Cosmic-ray exposure ages of fossil micrometeorites from mid-Ordovician sediments at Lynna River, Russia by Meier, M.M.M., Schmitz, B., Lindskog, A., Maden, C., Wieler, R.

“…We measured the He and Ne concentrations of 50 individual extraterrestrial chromite grains recovered from mid-Ordovician (lower Darriwilian) sediments from the…”
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The Solar Noble Gas Record in Lunar Samples and Meteorites by Wieler, R

“…Lunar soil and certain meteorites contain noble gases trapped from the solar wind at various times in the past. The progress in the last decade to decipher…”
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Noble gases in individual L chondritic micrometeorites preserved in an Ordovician limestone by Meier, M.M.M., Schmitz, B., Baur, H., Wieler, R.

“…We have measured the He and Ne concentrations and isotopic ratios of individual sediment-dispersed extraterrestrial chromite grains (63–180 μm in diameter)…”
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Graphite grains in supernova ejecta – Insights from a noble gas study of 91 individual KFC1 presolar graphite grains from the Murchison meteorite by Meier, M.M.M., Heck, P.R., Amari, S., Baur, H., Wieler, R.

“…We have measured helium and neon concentrations, elemental and isotopic ratios of 91 individual presolar graphite grains from the KFC1 density separate of the…”
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Comment on "Cosmogenic neon in grains separated from individual chondrules: Evidence of precompaction exposure in chondrules" by J. P. Das, J. N. Goswami, O. V. Pravdivtseva, A. P. Meshik, and C. M. Hohenberg by Ott, U., Wieler, R., Huber, L.

“…Das et al. (2012) claim that in several cases nominal cosmic ray exposure ages derived from concentrations of cosmogenic Ne in individual olivine grains…”
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The Predictable Collateral Consequences of Nucleosynthesis by Spallation Reactions in the Early Solar System by Leya, I, Halliday, A. N, Wieler, R

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Cosmogenic helium and neon in individual chondrules from Allende and Murchison: Implications for the precompaction exposure history of chondrules by ROTH, A. S. G., BAUR, H., HEBER, V. S., REUSSER, E., WIELER, R.

“…– We analyzed cosmogenic He and Ne in more than 60 individual chondrules separated from small chips from the carbonaceous chondrites Allende and Murchison. The…”
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The cosmogenic 21Ne production rate in quartz evaluated on a large set of existing 21Ne–10Be data by Kober, F., Alfimov, V., Ivy-Ochs, S., Kubik, P.W., Wieler, R.

“…Based on a compilation of published combined 10Be and 21Ne cosmogenic nuclide data sets from quartz samples obtained at ETH Zürich we assess the 21Ne/10Be…”
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Complex multiple cosmogenic nuclide concentration and histories in the arid Rio Lluta catchment, northern Chile by Kober, F., Ivy-Ochs, S., Zeilinger, G., Schlunegger, F., Kubik, P. W., Baur, H., Wieler, R.

“…Terrestrial cosmogenic nuclide (TCN) concentrations measured in river sediments can be used to estimate catchment‐wide denudation rates. By investigating…”
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Calibration of cosmogenic noble gas production based on 36Cl-36Ar ages. Part 2. The 81Kr-Kr dating technique by Leya, I., Dalcher, N., Vogel, N., Wieler, R., Caffee, M. W., Welten, K. C., Nishiizumi, K.

“…We calibrated the 81Kr‐Kr dating system for ordinary chondrites of different sizes using independent shielding‐corrected 36Cl‐36Ar ages. Krypton concentrations…”
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A global rain of micrometeorites following breakup of the L-chondrite parent body-Evidence from solar wind-implanted Ne in fossil extraterrestrial chromite grains from China by ALWMARK, C., SCHMITZ, B., MEIER, M. M. M., BAUR, H., WIELER, R.

“…– Previous studies of limestone beds of mid‐Ordovician age from both Sweden and China show that the Earth saw an at least two orders of magnitude increase in…”
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Similarities and differences between the solar wind light noble gas compositions determined on Apollo 15 SWC foils and on NASA Genesis targets by Vogel, N., Bochsler, P., Bühler, F., Heber, V. S., Grimberg, A., Baur, H., Horstmann, M., Bischoff, A., Wieler, R.

“…We compare the solar wind (SW) He, Ne, and Ar compositions collected during the Apollo Solar Wind Composition (SWC) experiments (1969–1972; Al‐ & Pt‐foils) and…”
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Stalagmite water content as a proxy for drip water supply in tropical and subtropical areas by Vogel, N, Scheidegger, Y, Brennwald, M. S, Fleitmann, D, Figura, S, Wieler, R, Kipfer, R

“…In this pilot study water was extracted from samples of two Holocene stalagmites from Socotra Island, Yemen, and one Eemian stalagmite from southern…”
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