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Observational Constraints on the Identification of Shallow Lunar Magmatism: Insights from Floor-Fractured CratersFloor-fractured craters are a class of lunar crater hypothesized to form in response to the emplacement of a shallow magmatic intrusion beneath the crater floor. The emplacement of a shallow magmatic body should result in a positive Bouguer anomaly relative to unaltered complex craters, a signal which is observed for the average Bouguer anomaly interior to the crater walls. We observe the Bouguer anomaly of floor-fractured craters on an individual basis using the unfiltered Bouguer gravity solution from GRAIL and also a degree 100-600 band-filtered Bouguer gravity solution. The low-magnitude of anomalies arising from shallow magmatic intrusions makes identification using unfiltered Bouguer gravity solutions inconclusive. The observed anomalies in the degree 100-600 Bouguer gravity solution are spatially heterogeneous, although there is spatial correlation between volcanic surface morphologies and positive Bouguer anomalies. We interpret these observations to mean that the spatial heterogeneity observed in the Bouguer signal is the result of variable degrees of magmatic degassing within the intrusions.
Document ID
20170002327
Document Type
Reprint (Version printed in journal)
Authors
Jozwiak, L. M. (Brown Univ. Providence, RI, United States)
Head, J. W., III (Brown Univ. Providence, RI, United States)
Neumann, G. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wilson, L. (Lancaster Univ. United Kingdom)
Date Acquired
March 17, 2017
Publication Date
April 27, 2016
Publication Information
Publication: ICARUS
Volume: 283
ISSN: 0019-1035
Subject Category
Lunar and Planetary Science and Exploration
Geosciences (General)
Report/Patent Number
GSFC-E-DAA-TN40006
Funding Number(s)
CONTRACT_GRANT: NNA14AB01A
CONTRACT_GRANT: NNX13AR86H
CONTRACT_GRANT: NNX13AO77G
CONTRACT_GRANT: NNX11AK29G
CONTRACT_GRANT: NNX12AL07G
Distribution Limits
Public
Copyright
Other