Isostatic Compensation of the Lunar Highlands.
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| Title: | Isostatic Compensation of the Lunar Highlands. |
|---|---|
| Authors: | Sori, Michael M.1 sori@lpl.arizona.edu, James, Peter B.2,3, Johnson, Brandon C.4, Soderblom, Jason M.5, Solomon, Sean C.6,7, Wieczorek, Mark A.8, Zuber, Maria T.5 |
| Source: | Journal of Geophysical Research. Planets. Feb2018, Vol. 123 Issue 2, p646-665. 20p. |
| Abstract: | Abstract: The lunar highlands are isostatically compensated at large horizontal scales, but the specific compensation mechanism has been difficult to identify. With topographic data from the Lunar Orbiter Laser Altimeter and gravity data from the Gravity Recovery and Interior Laboratory, we investigate support of highland topography. Poor correlation between crustal density and elevation shows that Pratt compensation is not important in the highlands. Using spectrally weighted admittance, we compared observed values of geoid‐to‐topography ratio (GTR) with those predicted by isostatic models. Observed GTRs are 25.8+7.5–5.7 m/km for the nearside highlands and 39.3+5.7–6.2 m/km for the farside highlands. These values are not consistent with flexural compensation of long‐wavelength topography or Airy isostasy defined under an assumption of equal mass in crustal columns. Instead, the observed GTR values are consistent with models of Airy compensation in which isostasy is defined under a requirement of equal pressures at equipotential surfaces at depth. The gravity and topography data thus reveal that long‐wavelength topography on the Moon is most likely compensated by variations in crustal thickness, implying that highland topography formed early in lunar history before the development of a thick elastic lithosphere. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Geophysical Research. Planets is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 128483266 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Isostatic Compensation of the Lunar Highlands. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Sori%2C+Michael+M%2E%22">Sori, Michael M.</searchLink><relatesTo>1</relatesTo><i> sori@lpl.arizona.edu</i><br /><searchLink fieldCode="AR" term="%22James%2C+Peter+B%2E%22">James, Peter B.</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Johnson%2C+Brandon+C%2E%22">Johnson, Brandon C.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Soderblom%2C+Jason+M%2E%22">Soderblom, Jason M.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Solomon%2C+Sean+C%2E%22">Solomon, Sean C.</searchLink><relatesTo>6,7</relatesTo><br /><searchLink fieldCode="AR" term="%22Wieczorek%2C+Mark+A%2E%22">Wieczorek, Mark A.</searchLink><relatesTo>8</relatesTo><br /><searchLink fieldCode="AR" term="%22Zuber%2C+Maria+T%2E%22">Zuber, Maria T.</searchLink><relatesTo>5</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Planets%22">Journal of Geophysical Research. Planets</searchLink>. Feb2018, Vol. 123 Issue 2, p646-665. 20p. – Name: Abstract Label: Abstract Group: Ab Data: Abstract: The lunar highlands are isostatically compensated at large horizontal scales, but the specific compensation mechanism has been difficult to identify. With topographic data from the Lunar Orbiter Laser Altimeter and gravity data from the Gravity Recovery and Interior Laboratory, we investigate support of highland topography. Poor correlation between crustal density and elevation shows that Pratt compensation is not important in the highlands. Using spectrally weighted admittance, we compared observed values of geoid‐to‐topography ratio (GTR) with those predicted by isostatic models. Observed GTRs are 25.8+7.5–5.7 m/km for the nearside highlands and 39.3+5.7–6.2 m/km for the farside highlands. These values are not consistent with flexural compensation of long‐wavelength topography or Airy isostasy defined under an assumption of equal mass in crustal columns. Instead, the observed GTR values are consistent with models of Airy compensation in which isostasy is defined under a requirement of equal pressures at equipotential surfaces at depth. The gravity and topography data thus reveal that long‐wavelength topography on the Moon is most likely compensated by variations in crustal thickness, implying that highland topography formed early in lunar history before the development of a thick elastic lithosphere. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Geophysical Research. Planets is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/2017JE005362 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 20 StartPage: 646 Titles: – TitleFull: Isostatic Compensation of the Lunar Highlands. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Sori, Michael M. – PersonEntity: Name: NameFull: James, Peter B. – PersonEntity: Name: NameFull: Johnson, Brandon C. – PersonEntity: Name: NameFull: Soderblom, Jason M. – PersonEntity: Name: NameFull: Solomon, Sean C. – PersonEntity: Name: NameFull: Wieczorek, Mark A. – PersonEntity: Name: NameFull: Zuber, Maria T. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2018 Type: published Y: 2018 Identifiers: – Type: issn-print Value: 21699097 Numbering: – Type: volume Value: 123 – Type: issue Value: 2 Titles: – TitleFull: Journal of Geophysical Research. Planets Type: main |
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