The equation of state of a lunar anorthosite - 60025High-pressure equation of state data for lunar anorthosite with an initial porosity of about 18% are compared with previous results for nonporous anorthosite and lunar samples. The porous anorthosite is characterized by a lower shock impedance than the nonporous anorthosite; nonporous gabbroic anorthosite and high-titanium mare basalt show higher shock impedances than the nonporous anorthosite. Thus the properties of target rocks may bias crater statistics and apparent cratering ages for different lunar terranes. Repeated meteoritic bombardment of the moon resulting in even mild brecciation and, hence, porosity, could lead to increases in the efficiency with which thermal energy is trapped by the surface upon impact.
Document ID
19790055238
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Jeanloz, R. (California Inst. of Tech. Pasadena, CA, United States)
Ahrens, T. J. (California Institute of Technology Pasadena, Calif., United States)