Výsledky vyhledávání - "Christa Göpel"

40 Ar/ 39 Ar ages of Northwest Africa 7034 and Northwest Africa 7533

Autor: Carl C. Swisher, Jacob Setera, Munir Humayun, J. Park, L. E. Nyquist, Brigitte Zanda, Jeremy S. Delaney, Christa Göpel, Keisuke Nagao, Brent D. Turrin, C.-Y. Shih, Gregory F. Herzog, Roger H. Hewins, F. N. Lindsay

Publikováno v: Meteoritics and Planetary Science
Meteoritics and Planetary Science, 2021, 56 (3), pp.515-545. ⟨10.1111/maps.13637⟩
Meteoritics and Planetary Science, Wiley, 2021, 56 (3), pp.515-545. ⟨10.1111/maps.13637⟩

International audience; The Martian breccias NWA 7034, NWA 7533, and paired meteorites record events ranging in age from 4.47 Ga to 1 wt% K and thought to be rich in feldspar and one containing

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6535374b211e95ed10ab634586a3ea6a
https://hal.science/hal-03470392

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Th/U variability in Allende chondrules

Autor: Francis Albarède, Janne Blichert-Toft, Christa Göpel, Marc Chaussidon

Publikováno v: Geochimica et Cosmochimica Acta
Geochimica et Cosmochimica Acta, Elsevier, 2020, 280, pp.378-394. ⟨10.1016/j.gca.2020.04.006⟩

International audience; 14 Lead isotope compositions were measured on both single and combined chondrules from the 15 CV3 carbonaceous chondrite Allende with the goal of determining the range of Th/U implied by 16 the radiogenic 208Pb*/206Pb* values.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::40497da3cac9f528d779a3cea4cfd150
https://hal.archives-ouvertes.fr/hal-02873607

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Mn–Cr systematics in primitive meteorites: Insights from mineral separation and partial dissolution

Autor: Brigitte Zanda, Christa Göpel, Albert Galy, Jean-Alix Barrat, Jean-Louis Birck

Publikováno v: Geochimica et Cosmochimica Acta. 156:1-24

Cr isotopic compositions have been measured on carbonaceous chondrites (CC): Tafassasset, Paris, Niger I, NWA 5958, NWA 8157 and Jbilet Winselwan. In bulk samples, the 54 Cr/ 52 Cr ratios (expressed as e 54 Cr) range from 0.93 to 1.58 e units. These

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1ba3954bcdee027c7e1942a994669f76
https://doi.org/10.1016/j.gca.2015.02.008

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Chromium isotope evidence in ejecta deposits for the nature of Paleoproterozoic impactors

Autor: Bérengère Mougel, Christa Göpel, Christian Koeberl, Frédéric Moynier

Publikováno v: Earth and Planetary Science Letters
Earth and Planetary Science Letters, Elsevier, 2017, 460, pp.105-111. ⟨10.1016/j.epsl.2016.12.008⟩
Earth and Planetary Science Letters, 2017, 460, pp.105-111. ⟨10.1016/j.epsl.2016.12.008⟩

Non-mass dependent chromium isotopic signatures have been successfully used to determine the presence and identification of extra-terrestrial materials in terrestrial impact rocks. Paleoproterozoic spherule layers from Greenland (Graenseso) and Russi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c3d0f6606d8c14565854c20c92249734

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Regolith breccia Northwest Africa 7533: Mineralogy and petrology with implications for early Mars

Autor: Allen K. Kennedy, Hugues Leroux, Eric Lewin, Roger H. Hewins, Jeremy J. Bellucci, Marion Grange, Damien Deldicque, Martin J. Whitehouse, Christa Göpel, Sylvain Courrech du Pont, Jean-Pierre Lorand, Pierre Beck, Maya Marinova, Munir Humayun, Alexander A. Nemchin, Laurent Remusat, Brigitte Zanda

Publikováno v: Meteoritics and Planetary Science
Meteoritics and Planetary Science, 2017, 52 (1), pp.89-124. ⟨10.1111/maps.12740⟩
Meteoritics and Planetary Science, Wiley, 2017, 52 (1), pp.89-124. ⟨10.1111/maps.12740⟩

Northwest Africa 7533, a polymict Martian breccia, consists of fine‐grained clast‐laden melt particles and microcrystalline matrix. While both melt and matrix contain medium‐grained noritic‐monzonitic material and crystal clasts, the matrix a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd5eede1659c9519a036506b6b11f961
https://hal.science/hal-02262480

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Origin and age of the earliest Martian crust from meteorite NWA 7533

Autor: Roger H. Hewins, Christa Göpel, Sylvain Pont, Brigitte Zanda, Marion Grange, Munir Humayun, Damien Deldicque, Alexander A. Nemchin, Allen K. Kennedy, Jean-Pierre Lorand, C. Fieni

Publikováno v: Nature. 503:513-516

Chemical analysis of the meteorite NWA 7533 indicates that it may be a Martian regolith breccia and, if so, that the crust of Mars may have formed in the first 100 million years of the planet’s history. This paper identifies the NWA 7533 meteorite

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::91292dda3922da4eaf8b85ef21fa834a
https://doi.org/10.1038/nature12764

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Lead contamination of the Seine River, France: Geochemical implications of a historical perspective

Autor: Marie Françoise Le Cloarec, Philippe Bonté, Sophie Ayrault, Christa Göpel, Matthieu Roy-Barman, Cindy Rianti Priadi

Publikováno v: Chemosphere
Chemosphere, 2012, 87 (8), pp.902-910. ⟨10.1016/j.chemosphere.2012.01.043⟩
Chemosphere, Elsevier, 2012, 87 (8), pp.902-910. ⟨10.1016/j.chemosphere.2012.01.043⟩

International audience; Four sediment cores collected in the Seine River basin and dated between 1916 and 2003 were analyzed for lead concentrations and isotopic composition. In all four cores, the measured Pb concentration (up to 460 mg kg$^{-1}$) l

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8aef8e671572e71e3ad4d4f2c376eb5d
https://doi.org/10.1016/j.chemosphere.2012.01.043

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Nickeliferous pyrite tracks pervasive hydrothermal alteration in Martian regolith breccia: A study in NWA 7533

Autor: Jean-Pierre Lorand, Allen K. Kennedy, Hugues Leroux, Marion Grange, Alexander A. Nemchin, Roger H. Hewins, Brigitte Zanda, Munir Humayun, Sylvain Pont, Laurent Remusat, Damien Jacob, Christa Göpel, Maya Marinova

Publikováno v: Meteoritics and Planetary Science
Meteoritics and Planetary Science, 2015, 50 (12), pp.2099-2120. ⟨10.1111/maps.12565⟩
Meteoritics and Planetary Science, Wiley, 2015, 50 (12), pp.2099-2120. ⟨10.1111/maps.12565⟩

Martian regolith breccia NWA 7533 (and the seven paired samples) is unique among Martian meteorites in showing accessory pyrite (up to 1% by weight). Pyrite is a late mineral, crystallized after the final assembly of the breccia. It is present in all

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c1092b3de2cd6e3d0dc754bdaab84c58
https://hal.science/hal-02308853

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Modern U–Pb chronometry of meteorites: Advancing to higher time resolution reveals new problems

Autor: Robert E. Zartman, James N. Connelly, Christa Göpel, Yuri Amelin, Leonid A. Neymark, J. H. Chen

Publikováno v: Geochimica et Cosmochimica Acta. 73:5212-5223

In this paper, we evaluate the factors that influence the accuracy of lead (Pb)-isotopic ages of meteorites, and may possibly be responsible for inconsistencies between Pb-isotopic and extinct nuclide timescales of the early Solar System: instrumenta

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a5f1ed8c2ee449568a79b7621b246898
https://doi.org/10.1016/j.gca.2009.01.040

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53Mn–53Cr systematics of the early Solar System revisited

Autor: Anne Trinquier, Claude J. Allègre, David Ulfbeck, Jean-Louis Birck, Christa Göpel

Publikováno v: Geochimica et Cosmochimica Acta. 72:5146-5163

We have reinvestigated the Mn–Cr systematics in a number of primitive meteorites, differentiated planetesimals and terrestrial planets in order to address the chronology of the early stages of protoplanetary disk evolution and planetary formation.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d717a7ae0a16f18c6bfd55b377c10631
https://doi.org/10.1016/j.gca.2008.03.023

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