Startseite Constraints on the early delivery and fractionation of Earth’s major volatiles from C/H, C/N, and C/S ratios
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Constraints on the early delivery and fractionation of Earth’s major volatiles from C/H, C/N, and C/S ratios

  • Marc M. Hirschmann EMAIL logo
Veröffentlicht/Copyright: 4. März 2016
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 101 Heft 3

Abstract

Earth’s inventory of principle volatiles C, H, N, and S is a legacy of its early stages of accretion and differentiation. Elemental ratios (C/H, C/N, C/S) are powerful tools for understanding early processing of Earth’s volatiles, as they monitor relative fractionations through important processes even when absolute concentrations are less well defined. The C/H ratio of the bulk silicate Earth (BSE), defined from surface reservoirs and minimally degassed oceanic basalts is 1.3 ± 0.3, which is 5–15 times lower than the C/H ratio of carbonaceous and enstatite chondrites and 2–5 times lower than ordinary chondrites. The BSE C/N ratio is superchondritic (40 ± 8; Bergin et al. 2015) while the C/S ratio (0.49 ± 0.14) is nearly chondritic. Successful models of volatile acquisition and processing must account for the effects of accretion, core formation, and atmospheric loss on all three of these ratios.

Simple models of equilibration between a magma ocean, the overlying atmosphere, and alloy destined for the core are used to explore the influence of core formation and atmospheric loss on major volatile concentrations and ratios. Among major volatile elements, C is most siderophile, and consequently core formation leaves behind a non-metallic Earth with low C/H, C/N, and C/S ratios compared to originally accreted materials and compared to the BSE. Compared to the predicted effect of early differentiation, the relatively high C/X ratios of the BSE argue in part that significant volatile replenishment occurred after core formation ceased, possibly in the form of a late veneer. However, a late veneer with chondritic composition is insufficient to explain the pattern of major volatile enrichments and depletions because BSE C/H and C/N ratios are non-chondritic. The C/H ratio is best explained if an appreciable fraction of H in the BSE predates delivery in the late veneer. Although atmospheric blow-off is an attractive explanation for the high C/N ratio, available data for C and N solubility and metal/silicate partitioning suggest that atmospheric blow-off cannot counter core formation to produce subchondritic C/N. Thus, unless virtually all core-forming metal segregated prior to volatile accretion (or relative C and N solubilities are appreciably different from those assumed here), the BSE C/N ratio suggests that accreting materials had elevated ratios compared to carbonaceous chondrites. One possibility is that a fraction of Earth’s volatiles accreted from differentiated C-rich planetesimals similar to the ureilite parent body. Reconciling C/H, C/N, and C/S ratios of the BSE simultaneously presents a major challenge that almost certainly involves a combination of parent body processing, core formation, catastrophic atmospheric loss, and partial replenishment by a late veneer. The chondritic C/S ratio of the BSE and relatively low S content of the BSE constrains the BSE C concentration, but a potential complicating factor in interpreting the BSE C/S ratio is the possible effect of segregation of an S-rich matte to the core during the later parts of core-mantle differentiation.

Keywords: Volatiles; magma ocean; core formation; accretion

Acknowledgments

This work benefitted from conversations with many people, including Ted Bergin, Geoff Blake, Fred Ciesla, Jackie Li, Alex Halliday, Bernard Marty, Sujoy Mukhopadhyay, and Sarah Stewart. The comments of Bernard Marty, an anonymous referee, and Associate Editor Tracy Rushmer are appreciated. I grate fully acknowledge support by grants from NASA (NNX11AG64G) and NSF (AST1344133, EAR1426772).

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  1. Manuscript handled by Tracy Rushmer.

Received: 2015-6-7
Accepted: 2015-10-18
Published Online: 2016-3-4
Published in Print: 2016-3-1

© 2016 by Walter de Gruyter Berlin/Boston

Artikel in diesem Heft

  1. Editorial
  2. The most-cited journal in mineralogy and petrology (and what scientists can learn from baseball)
  3. Fluids in the Crust
  4. Fluids in the crust during regional metamorphism: Forty years in the Waterville limestone
  5. Research Article
  6. Remanent magnetization, magnetic coupling, and interface ionic configurations of intergrown rhombohedral and cubic Fe-Ti oxides: A short survey
  7. Research Article
  8. Are covalent bonds really directed?
  9. Dana Medal Paper
  10. Constraints on the early delivery and fractionation of Earth’s major volatiles from C/H, C/N, and C/S ratios
  11. Crossroads in Earth and Planetary Materials
  12. Octahedral chemistry of 2:1 clay minerals and hydroxyl band position in the near-infrared: Application to Mars
  13. Special Collection: Advances in Ultrahigh-Pressure Metamorphism
  14. Multi-stage barite crystallization in partially melted UHP eclogite from the Sulu belt, China
  15. Spinels Renaissance: The Past, Present, and Future of those Ubiquitous Minerals and Materials
  16. Crystal chemistry of spinels in the system MgAl2O4-MgV2O4-Mg2VO4
  17. Spinels Renaissance: The Past, Present, and Future of those Ubiquitous Minerals and Materials
  18. Magnetite spherules in pyroclastic iron ore at El Laco, Chile
  19. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  20. Evidence for dissolution-reprecipitation of apatite and preferential LREE mobility in carbonatite-derived late-stage hydrothermal processes
  21. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  22. Compositional variation of apatite from rift-related alkaline igneous rocks of the Gardar Province, South Greenland
  23. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  24. Dynamics and thermodynamics of magma mixing: Insights from a simple exploratory model
  25. Special Collection: From Magmas to Ore Deposits
  26. Geochemistry, petrologic evolution, and ore deposits of the Miocene Bodie Hills Volcanic Field, California and Nevada
  27. Research Article
  28. Recognizing sulfate and phosphate complexes chemisorbed onto nanophase weathering products on Mars using in-situ and remote observations
  29. Research Article
  30. Crystallographic orientation relationships in host–inclusion systems: New insights from large EBSD data sets
  31. Research Article
  32. In-situ infrared spectroscopic studies of hydroxyl in amphiboles at high pressure
  33. Research Article
  34. Confined water in tunnel nanopores of sepiolite: Insights from molecular simulations
  35. Research Article
  36. Equation of state of the high-pressure Fe3O4 phase and a new structural transition at 70 GPa
  37. Research Article
  38. Reflectance spectroscopy of chromium-bearing spinel with application to recent orbital data from the Moon
  39. Research Article
  40. Temperature dependences of the hyperfine parameters of Fe2+ in FeTiO3 as determined by 57Fe-Mössbauer spectroscopy
  41. Letter
  42. Accurate predictions of iron redox state in silicate glasses: A multivariate approach using X-ray absorption spectroscopy
  43. Research Article
  44. New Mineral Names
https://doi.org/10.2138/am-2016-5452
Schlagwörter für diesen Artikel
Volatiles; magma ocean; core formation; accretion

Artikel in diesem Heft

  1. Editorial
  2. The most-cited journal in mineralogy and petrology (and what scientists can learn from baseball)
  3. Fluids in the Crust
  4. Fluids in the crust during regional metamorphism: Forty years in the Waterville limestone
  5. Research Article
  6. Remanent magnetization, magnetic coupling, and interface ionic configurations of intergrown rhombohedral and cubic Fe-Ti oxides: A short survey
  7. Research Article
  8. Are covalent bonds really directed?
  9. Dana Medal Paper
  10. Constraints on the early delivery and fractionation of Earth’s major volatiles from C/H, C/N, and C/S ratios
  11. Crossroads in Earth and Planetary Materials
  12. Octahedral chemistry of 2:1 clay minerals and hydroxyl band position in the near-infrared: Application to Mars
  13. Special Collection: Advances in Ultrahigh-Pressure Metamorphism
  14. Multi-stage barite crystallization in partially melted UHP eclogite from the Sulu belt, China
  15. Spinels Renaissance: The Past, Present, and Future of those Ubiquitous Minerals and Materials
  16. Crystal chemistry of spinels in the system MgAl2O4-MgV2O4-Mg2VO4
  17. Spinels Renaissance: The Past, Present, and Future of those Ubiquitous Minerals and Materials
  18. Magnetite spherules in pyroclastic iron ore at El Laco, Chile
  19. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  20. Evidence for dissolution-reprecipitation of apatite and preferential LREE mobility in carbonatite-derived late-stage hydrothermal processes
  21. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  22. Compositional variation of apatite from rift-related alkaline igneous rocks of the Gardar Province, South Greenland
  23. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  24. Dynamics and thermodynamics of magma mixing: Insights from a simple exploratory model
  25. Special Collection: From Magmas to Ore Deposits
  26. Geochemistry, petrologic evolution, and ore deposits of the Miocene Bodie Hills Volcanic Field, California and Nevada
  27. Research Article
  28. Recognizing sulfate and phosphate complexes chemisorbed onto nanophase weathering products on Mars using in-situ and remote observations
  29. Research Article
  30. Crystallographic orientation relationships in host–inclusion systems: New insights from large EBSD data sets
  31. Research Article
  32. In-situ infrared spectroscopic studies of hydroxyl in amphiboles at high pressure
  33. Research Article
  34. Confined water in tunnel nanopores of sepiolite: Insights from molecular simulations
  35. Research Article
  36. Equation of state of the high-pressure Fe3O4 phase and a new structural transition at 70 GPa
  37. Research Article
  38. Reflectance spectroscopy of chromium-bearing spinel with application to recent orbital data from the Moon
  39. Research Article
  40. Temperature dependences of the hyperfine parameters of Fe2+ in FeTiO3 as determined by 57Fe-Mössbauer spectroscopy
  41. Letter
  42. Accurate predictions of iron redox state in silicate glasses: A multivariate approach using X-ray absorption spectroscopy
  43. Research Article
  44. New Mineral Names
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