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Composition and origin of the Dewar geochemical anomaly
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| Zeitschriftentitel: | Journal of Geophysical Research: Planets |
|---|---|
| Personen und Körperschaften: | , , , , , , , , , |
| In: | Journal of Geophysical Research: Planets, 113, 2008, E2 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
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| Schlagwörter: |
| author_facet |
Lawrence, Samuel J. Hawke, B. Ray Gillis‐Davis, Jeffrey J. Taylor, G. Jeffrey Lawrence, David J. Cahill, Joshua T. Hagerty, Justin J. Lucey, Paul G. Smith, Gregory A. Keil, Klaus Lawrence, Samuel J. Hawke, B. Ray Gillis‐Davis, Jeffrey J. Taylor, G. Jeffrey Lawrence, David J. Cahill, Joshua T. Hagerty, Justin J. Lucey, Paul G. Smith, Gregory A. Keil, Klaus |
|---|---|
| author |
Lawrence, Samuel J. Hawke, B. Ray Gillis‐Davis, Jeffrey J. Taylor, G. Jeffrey Lawrence, David J. Cahill, Joshua T. Hagerty, Justin J. Lucey, Paul G. Smith, Gregory A. Keil, Klaus |
| spellingShingle |
Lawrence, Samuel J. Hawke, B. Ray Gillis‐Davis, Jeffrey J. Taylor, G. Jeffrey Lawrence, David J. Cahill, Joshua T. Hagerty, Justin J. Lucey, Paul G. Smith, Gregory A. Keil, Klaus Journal of Geophysical Research: Planets Composition and origin of the Dewar geochemical anomaly Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| author_sort |
lawrence, samuel j. |
| spelling |
Lawrence, Samuel J. Hawke, B. Ray Gillis‐Davis, Jeffrey J. Taylor, G. Jeffrey Lawrence, David J. Cahill, Joshua T. Hagerty, Justin J. Lucey, Paul G. Smith, Gregory A. Keil, Klaus 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2007je002904 <jats:p>Dewar crater is a 50‐km diameter impact structure located in the highlands northwest of the South Pole–Aitken basin on the lunar farside. A low‐albedo area with enhanced Th and Sm values is centered east‐northeast of Dewar crater. This area also exhibits elevated FeO abundances (9.0–16.6 wt %) and TiO<jats:sub>2</jats:sub> values (0.6–2 wt %). The range of FeO and TiO<jats:sub>2</jats:sub> abundances determined for the darkest portions of the geochemical anomaly overlap the range of FeO and TiO<jats:sub>2</jats:sub> values determined for nearside mare basalt deposits. Analysis of Clementine spectra obtained from the darkest portions of the Dewar geochemical anomaly indicates that the low‐albedo materials contain large amounts of high‐Ca clinopyroxene consistent with the presence of major amounts of mare basalt. Cryptomare deposits have played an important role in the formation of the Dewar geochemical anomaly. The evidence indicates that buried basalt, or cryptomare, was excavated from depth during impact events that formed dark‐haloed craters in the region. We show that an early Imbrian‐ or Nectarian‐age, low‐TiO<jats:sub>2</jats:sub> mare basalt deposit with enhanced Th concentrations (6–7 <jats:italic>μ</jats:italic>g/g) exists in the Dewar region. This ancient mare unit was buried by ejecta from Dewar crater, creating a cryptomare. Although most mare units on the central farside of the Moon exhibit low Th abundances, the enhanced Th values associated with the Dewar cryptomare deposit indicate that at least some portions of the underlying lunar interior (mantle and crust) on the farside of the Moon were not Th poor.</jats:p> Composition and origin of the Dewar geochemical anomaly Journal of Geophysical Research: Planets |
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10.1029/2007je002904 |
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Allgemeine Naturwissenschaft Physik Technik Geologie und Paläontologie Geographie Chemie und Pharmazie Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft Biologie |
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| title |
Composition and origin of the Dewar geochemical anomaly |
| title_unstemmed |
Composition and origin of the Dewar geochemical anomaly |
| title_full |
Composition and origin of the Dewar geochemical anomaly |
| title_fullStr |
Composition and origin of the Dewar geochemical anomaly |
| title_full_unstemmed |
Composition and origin of the Dewar geochemical anomaly |
| title_short |
Composition and origin of the Dewar geochemical anomaly |
| title_sort |
composition and origin of the dewar geochemical anomaly |
| topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| url |
http://dx.doi.org/10.1029/2007je002904 |
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2008 |
| physical |
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| description |
<jats:p>Dewar crater is a 50‐km diameter impact structure located in the highlands northwest of the South Pole–Aitken basin on the lunar farside. A low‐albedo area with enhanced Th and Sm values is centered east‐northeast of Dewar crater. This area also exhibits elevated FeO abundances (9.0–16.6 wt %) and TiO<jats:sub>2</jats:sub> values (0.6–2 wt %). The range of FeO and TiO<jats:sub>2</jats:sub> abundances determined for the darkest portions of the geochemical anomaly overlap the range of FeO and TiO<jats:sub>2</jats:sub> values determined for nearside mare basalt deposits. Analysis of Clementine spectra obtained from the darkest portions of the Dewar geochemical anomaly indicates that the low‐albedo materials contain large amounts of high‐Ca clinopyroxene consistent with the presence of major amounts of mare basalt. Cryptomare deposits have played an important role in the formation of the Dewar geochemical anomaly. The evidence indicates that buried basalt, or cryptomare, was excavated from depth during impact events that formed dark‐haloed craters in the region. We show that an early Imbrian‐ or Nectarian‐age, low‐TiO<jats:sub>2</jats:sub> mare basalt deposit with enhanced Th concentrations (6–7 <jats:italic>μ</jats:italic>g/g) exists in the Dewar region. This ancient mare unit was buried by ejecta from Dewar crater, creating a cryptomare. Although most mare units on the central farside of the Moon exhibit low Th abundances, the enhanced Th values associated with the Dewar cryptomare deposit indicate that at least some portions of the underlying lunar interior (mantle and crust) on the farside of the Moon were not Th poor.</jats:p> |
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| author | Lawrence, Samuel J., Hawke, B. Ray, Gillis‐Davis, Jeffrey J., Taylor, G. Jeffrey, Lawrence, David J., Cahill, Joshua T., Hagerty, Justin J., Lucey, Paul G., Smith, Gregory A., Keil, Klaus |
| author_facet | Lawrence, Samuel J., Hawke, B. Ray, Gillis‐Davis, Jeffrey J., Taylor, G. Jeffrey, Lawrence, David J., Cahill, Joshua T., Hagerty, Justin J., Lucey, Paul G., Smith, Gregory A., Keil, Klaus, Lawrence, Samuel J., Hawke, B. Ray, Gillis‐Davis, Jeffrey J., Taylor, G. Jeffrey, Lawrence, David J., Cahill, Joshua T., Hagerty, Justin J., Lucey, Paul G., Smith, Gregory A., Keil, Klaus |
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| description | <jats:p>Dewar crater is a 50‐km diameter impact structure located in the highlands northwest of the South Pole–Aitken basin on the lunar farside. A low‐albedo area with enhanced Th and Sm values is centered east‐northeast of Dewar crater. This area also exhibits elevated FeO abundances (9.0–16.6 wt %) and TiO<jats:sub>2</jats:sub> values (0.6–2 wt %). The range of FeO and TiO<jats:sub>2</jats:sub> abundances determined for the darkest portions of the geochemical anomaly overlap the range of FeO and TiO<jats:sub>2</jats:sub> values determined for nearside mare basalt deposits. Analysis of Clementine spectra obtained from the darkest portions of the Dewar geochemical anomaly indicates that the low‐albedo materials contain large amounts of high‐Ca clinopyroxene consistent with the presence of major amounts of mare basalt. Cryptomare deposits have played an important role in the formation of the Dewar geochemical anomaly. The evidence indicates that buried basalt, or cryptomare, was excavated from depth during impact events that formed dark‐haloed craters in the region. We show that an early Imbrian‐ or Nectarian‐age, low‐TiO<jats:sub>2</jats:sub> mare basalt deposit with enhanced Th concentrations (6–7 <jats:italic>μ</jats:italic>g/g) exists in the Dewar region. This ancient mare unit was buried by ejecta from Dewar crater, creating a cryptomare. Although most mare units on the central farside of the Moon exhibit low Th abundances, the enhanced Th values associated with the Dewar cryptomare deposit indicate that at least some portions of the underlying lunar interior (mantle and crust) on the farside of the Moon were not Th poor.</jats:p> |
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| imprint | American Geophysical Union (AGU), 2008 |
| imprint_str_mv | American Geophysical Union (AGU), 2008 |
| institution | DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Zi4, DE-Gla1, DE-15, DE-Pl11, DE-Rs1, DE-14, DE-105 |
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| language | English |
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| publisher | American Geophysical Union (AGU) |
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| spelling | Lawrence, Samuel J. Hawke, B. Ray Gillis‐Davis, Jeffrey J. Taylor, G. Jeffrey Lawrence, David J. Cahill, Joshua T. Hagerty, Justin J. Lucey, Paul G. Smith, Gregory A. Keil, Klaus 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2007je002904 <jats:p>Dewar crater is a 50‐km diameter impact structure located in the highlands northwest of the South Pole–Aitken basin on the lunar farside. A low‐albedo area with enhanced Th and Sm values is centered east‐northeast of Dewar crater. This area also exhibits elevated FeO abundances (9.0–16.6 wt %) and TiO<jats:sub>2</jats:sub> values (0.6–2 wt %). The range of FeO and TiO<jats:sub>2</jats:sub> abundances determined for the darkest portions of the geochemical anomaly overlap the range of FeO and TiO<jats:sub>2</jats:sub> values determined for nearside mare basalt deposits. Analysis of Clementine spectra obtained from the darkest portions of the Dewar geochemical anomaly indicates that the low‐albedo materials contain large amounts of high‐Ca clinopyroxene consistent with the presence of major amounts of mare basalt. Cryptomare deposits have played an important role in the formation of the Dewar geochemical anomaly. The evidence indicates that buried basalt, or cryptomare, was excavated from depth during impact events that formed dark‐haloed craters in the region. We show that an early Imbrian‐ or Nectarian‐age, low‐TiO<jats:sub>2</jats:sub> mare basalt deposit with enhanced Th concentrations (6–7 <jats:italic>μ</jats:italic>g/g) exists in the Dewar region. This ancient mare unit was buried by ejecta from Dewar crater, creating a cryptomare. Although most mare units on the central farside of the Moon exhibit low Th abundances, the enhanced Th values associated with the Dewar cryptomare deposit indicate that at least some portions of the underlying lunar interior (mantle and crust) on the farside of the Moon were not Th poor.</jats:p> Composition and origin of the Dewar geochemical anomaly Journal of Geophysical Research: Planets |
| spellingShingle | Lawrence, Samuel J., Hawke, B. Ray, Gillis‐Davis, Jeffrey J., Taylor, G. Jeffrey, Lawrence, David J., Cahill, Joshua T., Hagerty, Justin J., Lucey, Paul G., Smith, Gregory A., Keil, Klaus, Journal of Geophysical Research: Planets, Composition and origin of the Dewar geochemical anomaly, Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| title | Composition and origin of the Dewar geochemical anomaly |
| title_full | Composition and origin of the Dewar geochemical anomaly |
| title_fullStr | Composition and origin of the Dewar geochemical anomaly |
| title_full_unstemmed | Composition and origin of the Dewar geochemical anomaly |
| title_short | Composition and origin of the Dewar geochemical anomaly |
| title_sort | composition and origin of the dewar geochemical anomaly |
| title_unstemmed | Composition and origin of the Dewar geochemical anomaly |
| topic | Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| url | http://dx.doi.org/10.1029/2007je002904 |