A divergent heritage for complex organics in Isheyevo lithic clasts Accepted Manuscript A divergent heritage for complex organics in Isheyevo lithic clasts Elishevah M M E van Kooten, Kazuhide Nagashi[.]
Accepted Manuscript A divergent heritage for complex organics in Isheyevo lithic clasts Elishevah M.M.E van Kooten, Kazuhide Nagashima, Takeshi Kasama, Susanne Wampfler, Jon P Ramsey, Søren Frimann, Zoltan I Balogh, Martin Schiller, Daniel P Wielandt, Ian A Franchi, Jes K Jørgensen, Alexander N Krot, Martin Bizzarro PII: DOI: Reference: S0016-7037(17)30079-0 http://dx.doi.org/10.1016/j.gca.2017.02.002 GCA 10149 To appear in: Geochimica et Cosmochimica Acta Please cite this article as: van Kooten, E.M.M., Nagashima, K., Kasama, T., Wampfler, S., Ramsey, J.P., Frimann, S., Balogh, Z.I., Schiller, M., Wielandt, D.P., Franchi, I.A., Jørgensen, J.K., Krot, A.N., Bizzarro, M., A divergent heritage for complex organics in Isheyevo lithic clasts, Geochimica et Cosmochimica Acta (2017), doi: http:// dx.doi.org/10.1016/j.gca.2017.02.002 This is a PDF file of an unedited manuscript that has been accepted for publication As a service to our customers we are providing this early version of the manuscript The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain A divergent heritage for complex organics in Isheyevo lithic clasts Elishevah M.M.E van Kootena , Kazuhide Nagashimab , Takeshi Kasamac , Susanne Wampflerd , Jon P Ramseya,e , Søren Frimanna,e , Zoltan I Baloghc , Martin Schillera , Daniel P Wielandta , Ian A Franchif , Jes K Jørgensena,e , Alexander N Krota,b , and Martin Bizzarroa a Centre for Star and Planet Formation and Natural History Museum of Denmark, University of Copenhagen, DK-1350 Copenhagen, Denmark b Hawai‘i Institute of Geophysics and Planetology, University of Hawai‘i at M¯ anoa, HI 96822, USA c Centre for Electron Nanoscopy, Technical University of Denmark, DK-2800, Copenhagen d Center for Space and Habitability, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland e Niels Bohr Institute, DK-1350 Copenhagen, Denmark f Planetary and Space Sciences, Open University, Milton Keynes, MK7 6AA, UK In preparation for Geochim Cosmochim Acta Abstract Primitive meteorites are samples of asteroidal bodies that contain a high proportion of chemically complex organic matter (COM) including prebiotic molecules such as amino acids, which are thought to have been delivered to Earth via impacts during the early history of the Solar System Thus, understanding the origin of COM, including their for- mation pathway(s) and environment(s), is critical to elucidate the origin of life on Earth as well as assessing the potential habitability of exoplanetary systems The Isheyevo CH/CBb carbonaceous chondrite contains chondritic lithic clasts with variable enrich- ments in 15 N believed to be of outer Solar System origin Using transmission electron 10 microscopy (TEM-EELS) and in situ isotope analyses (SIMS and NanoSIMS), we report 11 on the structure of the organic matter as well as the bulk H and N isotope composition 12 of Isheyevo lithic clasts These data are complemented by electron microprobe analy- 13 ses of the clast mineral chemistry and bulk Mg and Cr isotopes obtained by inductively 14 coupled plasma and thermal ionization mass spectrometry, respectively (MC-ICPMS and 15 TIMS) Weakly hydrated (A) clasts largely consist of Mg-rich anhydrous silicates with lo- 16 cal hydrated veins composed of phyllosilicates, magnetite and globular and diffuse organic 17 matter Extensively hydrated clasts (H) are thoroughly hydrated and contain Fe-sulfides, 18 sometimes clustered with organic matter, as well as magnetite and carbonates embedded 19 in a phyllosilicate matrix The A-clasts are characterized by a more 20 trogen isotope composition (δ15 N=200-650h) relative to H-clasts (δ15 N=50-180h) and 21 contain extremely 15 N-rich domains with δ15 N