fossil meteorites; Noble gases; extraterrestrial material flux; Meteorites; asteroid impacts
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. (2017), Cosmic-ray exposure ages of six chondritic Almahata Sitta fragments, in Meteoritics & Planetary Science
Riebe My E.I., Huber Liliane, Metzler Knut, Busemann Henner, Luginbuehl Stefanie M., Meier Matthias M.M., Maden Colin, Wieler Rainer (2017), Cosmogenic He and Ne in chondrules from clastic matrix and a lithic clast of Murchison: No pre-irradiation by the early sun, in Geochimica et Cosmochimica Acta
, 213, 618-634.
Riebe My E.I., Busemann Henner, Wieler Rainer, Maden Colin (2017), Closed System Step Etching of CI chondrite Ivuna reveals primordial noble gases in the HF-solubles, in Geochimica et Cosmochimica Acta
, 205, 65-83.
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. (2016), 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, in Meteoritics & Planetary Science
, 51(2), 407-428.
Herzog G. F., Cook D. L., Cosarinsky M., Huber L., Leya I., Park J. (2015), Cosmic-ray exposure ages of pallasites, in Meteoritics & Planetary Science
, 50(1), 86-111.
Keil Klaus, Zucolotto Maria E., Krot Alexander N., Doyle Patricia M., Telus Myriam, Krot Tatiana V., Greenwood Richard C., Franchi Ian A., Wasson John T., Welten Kees C., Caffee Marc W., Sears Derek W. G., Riebe My, Wieler Rainer, dos Santos Edivaldo, Scorzelli Rosa B., Gattacceca Jerome, Lagroix France, Laubenstein Matthias, Mendes Julio C., Schmitt-Kopplin Philippe, Harir Mourad, Moutinho Andre L. R. (2015), The Vicência meteorite fall: A new unshocked (S1) weakly metamorphosed (3.2) LL chondrite, in Meteoritics & Planetary Science
, 50(6), 1089-1111.
Trigo-Rodríguez Josep M., Llorca Jordi, Weyrauch Mona, Bischoff Addi, Moyano-Cambero Carles E., Keil Klaus, Laubenstein Matthias, Pack Andreas, Madiedo José María, Alonso-Azcárate Jacinto, Riebe My, Wieler Rainer, Ott Uli, Tapia Mar, Mestres Narcís (2014), The Ardón L6 ordinary chondrite: A long-hidden Spanish meteorite fall, in Meteoritics & Planetary Science
, 49(8), 1475-1484.
Ott U., Wieler R., Huber L. (2013), 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, in Meteoritics & Planetary Science
, 48(8), 1524-1528.
Leya I., Ammon K., Cosarinsky M., Dalcher N., Gnos E., Hofmann B., Huber L. (2013), Light noble gases in 12 meteorites from the Omani desert, Australia, Mauritania, Canada, and Sweden, in Meteoritics & Planetary Science
, 48(8), 1401-1414.
We propose a research program along four lines: i) Energetic particles from the early active sun - is there a record in meteorites?Young stars often emit large fluxes of energetic particles. It would be very important to find direct evidence that this also happened with the early sun. Several previous claims of a record of an early solar energetic particle irradiation in meteorites remain controversial. We are looking for the presence or absence of such evidence by a more sophisticated approach, i. e. by measuring noble gases produced by energetic particles in high-temperature objects in meteorites (chondrules and refractory inclusions). A careful sample selection and characterisation will allow us to distinguish noble gases acquired during an early exposure to energetic particles prior to meteorite compaction - if present - from the products of a later irradiation of the meteorite. ii) Primordial noble gases in primitive meteoritesPrimordial noble gases in meteorites were incorporated during the earliest stages of the solar system. Meteoritic noble gases are crucial for our understanding of the volatile elements in the solar system, the formation and early evolution of planetary building blocks, and ultimately also terrestrial and giant planets. Here we plan a) the first complete characterization of the noble gases in a CI chondrite by online etching, b) to study the effect of aqueous alteration on noble gas carriers in the particulalry primitive chondrite Tagish Lake and c) to search for isotopic heterogeneity in chondrites inherited from the early solar system by combining Kr and Xe data from online etching studies of a primitive meteorite with previously obtained isotopic data showing nucleosynthetic anomalies on other elements (e. g. Zr) in leachate fractions from the same meteorite. iii) Indigenous noble gases in lunar rocks - how volatile-poor is the Moon really?The Moon is the most volatile-depleted planetary sized body known and until a few years ago the lunar interior has been thought to be completely devoid of water. New analyses changed this picture, however, as they revealed sizeable amounts of water in lunar rocks. So far also no indigenous noble gases in lunar rocks have been unambiguously detected, but the respective analyses stem from the early days of lunar sample studies. In view of the renewed interest in lunar water and lunar volatiles in general, we plan to revisit the question of indigenous noble gases in suitable lunar samples with state of the art gas extraction and analysis techniques. iv) Meteorites and micrometeorites in terrestrial sediments - the noble gas recordMid-Ordovician sediments in several parts of the world have been found to contain dispersed extraterrestrial chromite grains, and partly even fossilized meteorites. These are the result of the largest known collision in the asteroid belt. With our ultrasensitive noble gas mass spectrometer we showed that most individual Ordovician chromite grains were delivered as micrometeorites and these data also yielded other important insights into the delivery mechanisms of meteorites and micrometeorites. Here we propose to extend such investigations in space, time, and scope. We plan to study fossilized meteorites from different sediment layers, as well as dispersed chromite grains from other Mid-Ordovician sediments, e. g. from Russia. We also intend to analyse chromite grains deposited at several major geological boundaries, with the ultimate goal to study the potential influence of impacts on the biosphere. Finally we will search for material from the Moon brought to Earth in the aftermath of large impacts.