A divergent heritage for complex organics in Isheyevo lithic clasts

Publikation: Bidrag til tidsskriftTidsskriftartikelfagfællebedømt

Standard

A divergent heritage for complex organics in Isheyevo lithic clasts. / van Kooten, Elishevah M. M. E.; Nagashima, Kazuhide; Kasama, Takeshi; Wampfler, Susanne Franziska; Ramsey, Jonathan Paul; Frimann, Søren; Balogh, Zoltan I.; Schiller, Martin; Wielandt, Daniel Kim Peel; Franchi, Ian A.; Jørgensen, Jes Kristian; Krot, Alexander N.; Bizzarro, Martin.

I: Geochimica et Cosmochimica Acta, Bind 205, 15.05.2017, s. 119-148.

Publikation: Bidrag til tidsskriftTidsskriftartikelfagfællebedømt

Harvard

van Kooten, EMME, Nagashima, K, Kasama, T, Wampfler, SF, Ramsey, JP, Frimann, S, Balogh, ZI, Schiller, M, Wielandt, DKP, Franchi, IA, Jørgensen, JK, Krot, AN & Bizzarro, M 2017, 'A divergent heritage for complex organics in Isheyevo lithic clasts', Geochimica et Cosmochimica Acta, bind 205, s. 119-148. https://doi.org/10.1016/j.gca.2017.02.002

APA

van Kooten, E. M. M. E., Nagashima, K., Kasama, T., Wampfler, S. F., Ramsey, J. P., Frimann, S., Balogh, Z. I., Schiller, M., Wielandt, D. K. P., Franchi, I. A., Jørgensen, J. K., Krot, A. N., & Bizzarro, M. (2017). A divergent heritage for complex organics in Isheyevo lithic clasts. Geochimica et Cosmochimica Acta, 205, 119-148. https://doi.org/10.1016/j.gca.2017.02.002

Vancouver

van Kooten EMME, Nagashima K, Kasama T, Wampfler SF, Ramsey JP, Frimann S o.a. A divergent heritage for complex organics in Isheyevo lithic clasts. Geochimica et Cosmochimica Acta. 2017 maj 15;205:119-148. https://doi.org/10.1016/j.gca.2017.02.002

Author

van Kooten, Elishevah M. M. E. ; Nagashima, Kazuhide ; Kasama, Takeshi ; Wampfler, Susanne Franziska ; Ramsey, Jonathan Paul ; Frimann, Søren ; Balogh, Zoltan I. ; Schiller, Martin ; Wielandt, Daniel Kim Peel ; Franchi, Ian A. ; Jørgensen, Jes Kristian ; Krot, Alexander N. ; Bizzarro, Martin. / A divergent heritage for complex organics in Isheyevo lithic clasts. I: Geochimica et Cosmochimica Acta. 2017 ; Bind 205. s. 119-148.

Bibtex

@article{a9a3b9fa36c14d2ca0dc850de20692b1,
title = "A divergent heritage for complex organics in Isheyevo lithic clasts",
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 formation 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 enrichments in 15N believed to be of outer Solar System origin. Using transmission electron microscopy (TEM-EELS) and in situ isotope analyses (SIMS and NanoSIMS), we report on the structure of the organic matter as well as the bulk H and N isotope composition of Isheyevo lithic clasts. These data are complemented by electron microprobe analyses of the clast mineral chemistry and bulk Mg and Cr isotopes obtained by inductively coupled plasma and thermal ionization mass spectrometry, respectively (MC-ICPMS and TIMS). Weakly hydrated (A) clasts largely consist of Mg-rich anhydrous silicates with local hydrated veins composed of phyllosilicates, magnetite and globular and diffuse organic matter. Extensively hydrated clasts (H) are thoroughly hydrated and contain Fe-sulfides, sometimes clustered with organic matter, as well as magnetite and carbonates embedded in a phyllosilicate matrix. The A-clasts are characterized by a more 15N-rich bulk nitrogen isotope composition (δ15N = 200–650‰) relative to H-clasts (δ15N = 50–180‰) and contain extremely 15N-rich domains with δ15N < 5000‰. The D/H ratios of the clasts are correlated with the degree of clast hydration and define two distinct populations, which we interpret as reflecting mixing between D-poor fluid(s) and distinct organic endmember components that are variably D-rich. High-resolution N isotope data of 15N-rich domains show that the lithic clast diffuse organic matter is typically more 15N-rich than globular organic matter. The correlated δ15N values and C/N ratios of nanoglobules require the existence of multiple organic components, in agreement with the H isotope data. The combined H and N isotope data suggest that the organic precursors of the lithic clasts are defined by an extremely 15N-poor (similar to solar) and D-rich component for H-clasts, and a moderately 15N-rich and D-rich component for A-clasts. In contrast, the composition of the putative fluids is inferred to include D-poor but moderately to extremely 15N-rich H- and N-bearing components. The variable 15N enrichments in H- and A-clasts are associated with structural differences in the N bonding environments of their diffuse organic matter, which are dominated by amine groups in H-clasts and nitrile functional groups in A-clasts. We suggest that the isotopically divergent organic precursors in Isheyevo clasts may be similar to organic moieties in carbonaceous chondrites (CI, CM, CR) and thermally recalcitrant organic compounds in ordinary chondrites, respectively. The altering fluids, which are inferred to cause the 15N enrichments observed in the clasts, may be the result of accretion of variable abundances of NH3 and HCN ices. Finally, using bulk Mg and Cr isotope composition of clasts, we speculate on the accretion regions of the various primitive chondrites and components and the origin of the Solar System's N and H isotope variability.",
keywords = "Accretion regions, Carbonaceous chondrites, Complex organic matter",
author = "{van Kooten}, {Elishevah M. M. E.} and Kazuhide Nagashima and Takeshi Kasama and Wampfler, {Susanne Franziska} and Ramsey, {Jonathan Paul} and S{\o}ren Frimann and Balogh, {Zoltan I.} and Martin Schiller and Wielandt, {Daniel Kim Peel} and Franchi, {Ian A.} and J{\o}rgensen, {Jes Kristian} and Krot, {Alexander N.} and Martin Bizzarro",
year = "2017",
month = may,
day = "15",
doi = "10.1016/j.gca.2017.02.002",
language = "English",
volume = "205",
pages = "119--148",
journal = "Geochimica et Cosmochimica Acta",
issn = "0016-7037",
publisher = "Pergamon Press",

}

RIS

TY - JOUR

T1 - A divergent heritage for complex organics in Isheyevo lithic clasts

AU - van Kooten, Elishevah M. M. E.

AU - Nagashima, Kazuhide

AU - Kasama, Takeshi

AU - Wampfler, Susanne Franziska

AU - Ramsey, Jonathan Paul

AU - Frimann, Søren

AU - Balogh, Zoltan I.

AU - Schiller, Martin

AU - Wielandt, Daniel Kim Peel

AU - Franchi, Ian A.

AU - Jørgensen, Jes Kristian

AU - Krot, Alexander N.

AU - Bizzarro, Martin

PY - 2017/5/15

Y1 - 2017/5/15

N2 - 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 formation 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 enrichments in 15N believed to be of outer Solar System origin. Using transmission electron microscopy (TEM-EELS) and in situ isotope analyses (SIMS and NanoSIMS), we report on the structure of the organic matter as well as the bulk H and N isotope composition of Isheyevo lithic clasts. These data are complemented by electron microprobe analyses of the clast mineral chemistry and bulk Mg and Cr isotopes obtained by inductively coupled plasma and thermal ionization mass spectrometry, respectively (MC-ICPMS and TIMS). Weakly hydrated (A) clasts largely consist of Mg-rich anhydrous silicates with local hydrated veins composed of phyllosilicates, magnetite and globular and diffuse organic matter. Extensively hydrated clasts (H) are thoroughly hydrated and contain Fe-sulfides, sometimes clustered with organic matter, as well as magnetite and carbonates embedded in a phyllosilicate matrix. The A-clasts are characterized by a more 15N-rich bulk nitrogen isotope composition (δ15N = 200–650‰) relative to H-clasts (δ15N = 50–180‰) and contain extremely 15N-rich domains with δ15N < 5000‰. The D/H ratios of the clasts are correlated with the degree of clast hydration and define two distinct populations, which we interpret as reflecting mixing between D-poor fluid(s) and distinct organic endmember components that are variably D-rich. High-resolution N isotope data of 15N-rich domains show that the lithic clast diffuse organic matter is typically more 15N-rich than globular organic matter. The correlated δ15N values and C/N ratios of nanoglobules require the existence of multiple organic components, in agreement with the H isotope data. The combined H and N isotope data suggest that the organic precursors of the lithic clasts are defined by an extremely 15N-poor (similar to solar) and D-rich component for H-clasts, and a moderately 15N-rich and D-rich component for A-clasts. In contrast, the composition of the putative fluids is inferred to include D-poor but moderately to extremely 15N-rich H- and N-bearing components. The variable 15N enrichments in H- and A-clasts are associated with structural differences in the N bonding environments of their diffuse organic matter, which are dominated by amine groups in H-clasts and nitrile functional groups in A-clasts. We suggest that the isotopically divergent organic precursors in Isheyevo clasts may be similar to organic moieties in carbonaceous chondrites (CI, CM, CR) and thermally recalcitrant organic compounds in ordinary chondrites, respectively. The altering fluids, which are inferred to cause the 15N enrichments observed in the clasts, may be the result of accretion of variable abundances of NH3 and HCN ices. Finally, using bulk Mg and Cr isotope composition of clasts, we speculate on the accretion regions of the various primitive chondrites and components and the origin of the Solar System's N and H isotope variability.

AB - 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 formation 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 enrichments in 15N believed to be of outer Solar System origin. Using transmission electron microscopy (TEM-EELS) and in situ isotope analyses (SIMS and NanoSIMS), we report on the structure of the organic matter as well as the bulk H and N isotope composition of Isheyevo lithic clasts. These data are complemented by electron microprobe analyses of the clast mineral chemistry and bulk Mg and Cr isotopes obtained by inductively coupled plasma and thermal ionization mass spectrometry, respectively (MC-ICPMS and TIMS). Weakly hydrated (A) clasts largely consist of Mg-rich anhydrous silicates with local hydrated veins composed of phyllosilicates, magnetite and globular and diffuse organic matter. Extensively hydrated clasts (H) are thoroughly hydrated and contain Fe-sulfides, sometimes clustered with organic matter, as well as magnetite and carbonates embedded in a phyllosilicate matrix. The A-clasts are characterized by a more 15N-rich bulk nitrogen isotope composition (δ15N = 200–650‰) relative to H-clasts (δ15N = 50–180‰) and contain extremely 15N-rich domains with δ15N < 5000‰. The D/H ratios of the clasts are correlated with the degree of clast hydration and define two distinct populations, which we interpret as reflecting mixing between D-poor fluid(s) and distinct organic endmember components that are variably D-rich. High-resolution N isotope data of 15N-rich domains show that the lithic clast diffuse organic matter is typically more 15N-rich than globular organic matter. The correlated δ15N values and C/N ratios of nanoglobules require the existence of multiple organic components, in agreement with the H isotope data. The combined H and N isotope data suggest that the organic precursors of the lithic clasts are defined by an extremely 15N-poor (similar to solar) and D-rich component for H-clasts, and a moderately 15N-rich and D-rich component for A-clasts. In contrast, the composition of the putative fluids is inferred to include D-poor but moderately to extremely 15N-rich H- and N-bearing components. The variable 15N enrichments in H- and A-clasts are associated with structural differences in the N bonding environments of their diffuse organic matter, which are dominated by amine groups in H-clasts and nitrile functional groups in A-clasts. We suggest that the isotopically divergent organic precursors in Isheyevo clasts may be similar to organic moieties in carbonaceous chondrites (CI, CM, CR) and thermally recalcitrant organic compounds in ordinary chondrites, respectively. The altering fluids, which are inferred to cause the 15N enrichments observed in the clasts, may be the result of accretion of variable abundances of NH3 and HCN ices. Finally, using bulk Mg and Cr isotope composition of clasts, we speculate on the accretion regions of the various primitive chondrites and components and the origin of the Solar System's N and H isotope variability.

KW - Accretion regions

KW - Carbonaceous chondrites

KW - Complex organic matter

U2 - 10.1016/j.gca.2017.02.002

DO - 10.1016/j.gca.2017.02.002

M3 - Journal article

AN - SCOPUS:85014486870

VL - 205

SP - 119

EP - 148

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

SN - 0016-7037

ER -

ID: 177322445