FN Archimer Export Format PT J TI The old, unique C1 chondrite Flensburg - Insight into the first processes of aqueous alteration, brecciation, and the diversity of water-bearing parent bodies and lithologies BT AF BISCHOFF, Addi ALEXANDER, Conel M. O'D BARRAT, Jean-Alix BURKHARDT, Christoph BUSEMANN, Henner DEGERING, Detlev DI ROCCO, Tommaso FISCHER, Meike FOCKENBERG, Thomas FOUSTOUKOS, Dionysis, I GATTACCECA, Jerome GODINHO, Jose R. A. HARRIES, Dennis HEINLEIN, Dieter HELLMANN, Jan L. HERTKORN, Norbert HOLM, Anja JULL, A. J. Timothy KERRAOUCH, Imene KING, Ashley J. KLEINE, Thorsten KOLL, Dominik LACHNER, Johannes LUDWIG, Thomas MERCHEL, Silke MERTENS, Cornelia A. K. MORINO, Precillia NEUMANN, Wladimir PACK, Andreas PATZEK, Markus PAVETICH, Stefan REITZE, Maximilian P. RUFENACHT, Miriam RUGEL, Georg SCHMIDT, Charlotte SCHMITT-KOPPLIN, Philippe SCHONBACHLER, Maria TRIELOFF, Mario WALLNER, Anton WIMMER, Karl WOELFER, Elias AS 1:1;2:2;3:3;4:1;5:4;6:5;7:6;8:6,7;9:8;10:2;11:9;12:10;13:11;14:12;15:1;16:13;17:1;18:14,15;19:1;20:16,17;21:1;22:18;23:19;24:20;25:19;26:4;27:4;28:20;29:6;30:1;31:18;32:1;33:4;34:19;35:20;36:14,21;37:4;38:20;39:18,19;40:22;41:1; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;18:;19:;20:;21:;22:;23:;24:;25:;26:;27:;28:;29:;30:;31:;32:;33:;34:;35:;36:;37:;38:;39:;40:;41:; C1 Univ Munster, Inst Planetol, Wilhelm Klemm Str 10, D-48149 Munster, Germany. Carnegie Inst Sci, Earth & Planets Lab, Washington, DC 20015 USA. Univ Bretagne Occident, Inst Univ Europeen Mer, Pl Nicolas Copern, F-29280 Plouzane, France. Swiss Fed Inst Technol, Inst Geochem & Petrol, Clausiusstr 25, CH-8092 Zurich, Switzerland. Analyt & Entsorgung Rossendorf eV, VKTA Strahlenschutz, Bautzner Landstr 400, D-01328 Dresden, Germany. Univ Gottingen, Geowissensch Zentrum, Goldschmidtstr 1, D-37077 Gottingen, Germany. Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. Ruhr Univ Bochum, Inst Geol Mineral & Geophys, D-44780 Bochum, Germany. Aix Marseille Univ, Coll France, CEREGE, INRAE,IRD,CNRS, Aix En Provence, France. Helmholtz Zentrum Dresden Rossendorf, Helmholtz Inst Freiberg Resource Technol, Chemnitzer Str 40, D-09599 Freiberg, Germany. Friedrich Schiller Univ Jena, Inst Geowissensch, Carl Zeiss Promenade 10, D-07745 Jena, Germany. German Fireball Network, Lilienstr 3, D-86156 Augsburg, Germany. Helmholtz Zentrum Munchen, Analyt BioGeoChem, German Res Ctr Environm Hlth, Ingolstadter Landstr 1, D-85764 Neuherberg, Germany. Univ Arizona, AMS Lab, 1118 East Fourth St, Tucson, AZ 85721 USA. Hungarian Acad Sci, Isotope Climatol & Environm Res Ctr ICER, Inst Nucl Res, Bem Ter 18-C, H-4026 Debrecen, Hungary. Open Univ, Sch Phys Sci, Milton Keynes MK7 6AA, Bucks, England. Nat Hist Museum, Dept Earth Sci, Cromwell Rd, London SW7 5BD, England. Australian Natl Univ, Res Sch Phys, Dept Nucl Phys, Canberra, ACT 2601, Australia. Helmholtz Zentrum Dresden Rossendorf, Bautzner Landstr 400, D-01328 Dresden, Germany. Heidelberg Univ, Inst Geowissensch, Klaus Tschira Lab Kosmochem, Neuenheimer Feld 234-236, D-69120 Heidelberg, Germany. Tech Univ Munich, Chair Analyt Food Chem, D-85354 Freising Weihenstephan, Germany. RiesKraterMuseum, Eugene Shoemaker Pl 1, D-86720 Nordlingen, Germany. C2 UNIV MUNSTER, GERMANY CARNEGIE INST SCI, USA UBO, FRANCE ETH ZURICH, SWITZERLAND VKTA, GERMANY UNIV GOTTINGEN, GERMANY MAX PLANCK INST, GERMANY UNIV BOCHUM, GERMANY UNIV AIX MARSEILLE, FRANCE HELMHOLTZ ZENTRUM, GERMANY UNIV JENA, GERMANY GERMAN FIREBALL NETWORK, GERMANY HELMHOLTZ ZENTRUM MUNCHEN, GERMANY UNIV ARIZONA, USA HUNGARIAN ACAD SCI, HUNGARY UNIV OPEN, UK NHM, UK UNIV AUSTRALIAN NATL, AUSTRALIA HELMHOLTZ ZENTRUM, GERMANY UNIV HEIDELBERG, GERMANY UNIV TECH MUNICH, GERMANY RIESKRATERMUSEUM, GERMANY UM LGO IF 5.921 TC 31 UR https://archimer.ifremer.fr/doc/00686/79845/82672.pdf https://archimer.ifremer.fr/doc/00686/79845/82673.pdf LA English DT Article DE ;C1 chondrite;Carbonaceous chondrite;Aqueous alteration;Carbonates;Early solar system;Oldest carbonates in solar system;Unique chondrite;Ungrouped C chondrite AB On September 12, 2019 at 12:49:48 (UT) a bolide was observed by hundreds of eye-witnesses from the Netherlands, Germany, Belgium, Denmark and the UK. One day later a small meteorite stone was found by accident in Flensburg. The presence of short-lived cosmogenic radionuclides with half-lives as short as 16 days proves the recent exposure of the found object to cosmic rays in space linking it clearly to the bolide event. An exceptionally short exposure time of similar to 5000 years was determined. The 24.5 g stone has a fresh black fusion crust, a low density of <2 g/cm(3), and a magnetic susceptibility of log chi = 4.35 (chi in 10(-9) m(3)/kg). The rock consists of relict chondrules and clusters of sulfide and magnetite grains set in a fine-grained matrix. The most abundant phases are phyllosilicates. Carbonates (similar to 3.9 vol.%) occur as calcites, dolomites, and a Na-rich phase. The relict chondrules (often surrounded by sulfide laths) are free of anhydrous silicates and contain abundant serpentine. Lithic clasts are also surrounded by similar sulfide laths partly intergrown with carbonates. Mn-53-Cr-53 ages of carbonates in Flensburg indicate that brecciation and contemporaneous formation of the pyrrhotite-carbonate intergrowths by hydrothermal activities occurred no later than 4564.6 +/- 1.0 Ma (using the angrite D'Orbigny as the Mn-Cr age anchor). This corresponds to 2.6 +/- 1.0 or 3.4 +/- 1.0 Ma after formation of CAIs, depending on the exact absolute age of CAIs. This is the oldest dated evidence for brecciation and carbonate formation, which likely occurred during parent body growth and incipient heating due to decay of Al-26. In the three oxygen isotope diagram, Flensburg plots at the O-16-rich end of the CM chondrite field and in the transition field to CV-CK-CR chondrites. The mass-dependent Te isotopic composition of Flensburg is slightly different from mean CM chondrites and is most similar to those of the ungrouped C2 chondrite Tagish Lake. On the other hand, Ti-50 and Cr-54 isotope anomalies indicate that Flensburg is similar to CM chondrites, as do the similar to 10 wt.% H2O of the bulk material. Yet, the bulk Zn, Cu, and Pb concentrations are about 30% lower than those of mean CM chondrites. The He, Ne, and Ar isotopes of Flensburg show no solar wind contribution; its trapped noble gas signature is similar to that of CMs with a slightly lower concentration of Ne-20(tr). Based on the bulk H, C, and N elemental abundances and isotopic compositions, Flensburg is unique among chondrites, because it has the lightest bulk H and N isotopic compositions of any type 1 or 2 chondrite investigated so far. Moreover, the number of soluble organic compounds in Flensburg is even lower than that of the brecciated CI chondrite Orgueil. The extraordinary significance of Flensburg is evident from the observation that it represents the oldest chondrite sample in which the contemporaneous episodes of aqueous alteration and brecciation have been preserved. The characterization of a large variety of carbonaceous chondrites with different alteration histories is important for interpreting returned samples from the OSIRIS-REx and Hayabusa 2 missions. (C) 2020 The Authors. Published by Elsevier Ltd. PY 2021 PD JAN SO Geochimica Et Cosmochimica Acta SN 0016-7037 PU Pergamon-elsevier Science Ltd VL 293 UT 000600550100009 BP 142 EP 186 DI 10.1016/j.gca.2020.10.014 ID 79845 ER EF