1967
DOI: 10.1126/science.155.3758.77
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Lunar Ring Dikes from Orbiter I

Abstract: Orbiter photographs of the wall of a large circular formation on the moon show that the wall is a convex body resembling a flow of viscous lava. The slopes are less than the angle of repose of dry rock; hence an explanation in terms of mass wastage is hard to support. The viscosity is approximately 10(13) centimeter-gram- second units, indicating an acid lava.

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Cited by 33 publications
(5 citation statements)
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“…Abundant evidence of settling of mare lava surfaces due to cooling, shrinkage, or withdrawal suggests that circular structures such as these represent draping of cooled or cooling lavas over preexisting structure. Many of these mare ring structures have been attributed to shallow circular igneous intrusions emplaced along ring fractures over larger igneous masses[Strom, 1972;O'Keefe et al, 1967;Cameron and Padgett, 1974]. However, their abundance in the shallower maria and their partial development on craters that adjoin the highlands (Letronne, Lemonnier) argue that the draping hypothesis for the circular structures may represent the dominant mechanism of their formation.…”
mentioning
confidence: 99%
“…Abundant evidence of settling of mare lava surfaces due to cooling, shrinkage, or withdrawal suggests that circular structures such as these represent draping of cooled or cooling lavas over preexisting structure. Many of these mare ring structures have been attributed to shallow circular igneous intrusions emplaced along ring fractures over larger igneous masses[Strom, 1972;O'Keefe et al, 1967;Cameron and Padgett, 1974]. However, their abundance in the shallower maria and their partial development on craters that adjoin the highlands (Letronne, Lemonnier) argue that the draping hypothesis for the circular structures may represent the dominant mechanism of their formation.…”
mentioning
confidence: 99%
“…The second assumption is somewhat betterfounded ;chat the first; even if they were initiated by impact, the mare material and the mare basins are clearly older than the highlands (except for possible isolated extrusions, such as the Flamsteed ring (O'Keefe, et al, 1967). Moreover, all stages between complete burial by mare material and incipient subsidence a r e visible in regions such as Mare Nectaris and Oceanus Procellarum.…”
Section: Large Volumes Of Intermediate To Acidic Magmas Can Form By Pmentioning
confidence: 99%
“…A far-side crater at 1280E,28 S, about 70 km south of Tsiolkovsky, reveals some topographx (shown in the approximiiate cross-sectional profile A'-B'-C'-D', in Fig. 1) on the north and east sides of the cralter floor that seemi.s to be slightly different in extrusive or flow, nature from that near-Flamstead and elsewhere (1). The approxinmate profile between D' and C' crosses a lobalte fr-ont.…”
mentioning
confidence: 97%
“…The cosmic ray flux at the top of the atmosphere, due to an explosion occurring a distance R light-years away, for Ecr = 1051 ergs is, F = 9 X 10"/R'ergcm-2 (1) Since cosmic rays are charged particles, they will be affected by the interstellar magnetic field to some extent. However, for the nearby explosions that are of importance here this effect is negligible.…”
mentioning
confidence: 99%