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Provenance of block fields along lunar wrinkle ridges

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dc.contributor.author French, Renee A. en
dc.contributor.author Watters, Thomas R. en
dc.contributor.author Robinson, Mark S. en
dc.date.accessioned 2019-11-05T03:01:57Z
dc.date.available 2019-11-05T03:01:57Z
dc.date.issued 2019
dc.identifier.citation French, Renee A., Watters, Thomas R., and Robinson, Mark S. 2019. "<a href="https://repository.si.edu/handle/10088/99380">Provenance of block fields along lunar wrinkle ridges</a>." <em>Journal of Geophysical Research. E. Planets</em> 124 (11):2970-2982. <a href="https://doi.org/10.1029/2019JE006018">https://doi.org/10.1029/2019JE006018</a> en
dc.identifier.issn 2169-9100
dc.identifier.uri https://hdl.handle.net/10088/99380
dc.description.abstract Block fields and associated relatively high reflectance material along wrinkle ridge summits are revealed in meter scale Lunar Reconnaissance Orbiter Camera (LROC) images. Wrinkle ridges with block fields in Mare Australe, Crisium, Fecunditatis, Frigoris, Nubium, the northern half of Oceanus Procellarum, Serenitatis, and Tranquillitatis are evenly distributed, and block density generally increases with wrinkle ridge slope. The median cross-sectional area (proxy for diameter) of the 1,368 blocks measured in this study is 7 m2 and 75% of these blocks are = 14 m2. We propose that the largest variation in cross-sectional area of the blocks is related to substrate physical properties of the mare basalt and not a function of the slope on which they occur, suggesting that physical properties rather than slope is a stronger control on block size. The maximum length of blocks may constrain the minimum basalt flow thickness or joint width; our block measurements suggest basalt flows 2 – 14 m thick, agreeing with previous estimates. The data suggest that blocks originate from mare basalt layers that buckle and break as a result of movement along ridge-forming thrust faults. High reflectance material associated with wrinkle ridge blocks likely represents freshly exposed rock and soil. Meter-scale blocks may erode relatively quickly due to collisional disruption, indicating recent down-slope movement of regolith exposing preexisting blocks, or blocks formed and exposed by recent activity on ridge-forming faults. en
dc.relation.ispartof Journal of Geophysical Research. E. Planets en
dc.title Provenance of block fields along lunar wrinkle ridges en
dc.type Journal Article en
dc.identifier.srbnumber 153023
dc.identifier.doi 10.1029/2019JE006018
rft.jtitle Journal of Geophysical Research. E. Planets
rft.volume 124
rft.issue 11
rft.spage 2970
rft.epage 2982
dc.description.SIUnit NASM en
dc.description.SIUnit NASM-CEPS en
dc.citation.spage 2970
dc.citation.epage 2982

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