Johns Hopkins University2014-12-03 6:20 PM

Images of surface volatiles in Mercury's polar craters acquired by the MESSENGER spacecraft

Abstract


Images acquired by NASA's MESSENGER spacecraft have revealed the morphology of frozen volatiles in Mercury's permanently shadowed polar craters and provide insight into the mode of emplacement and evolution of the polar deposits . The images show extensive, spatially continuous regions with distinctive reflectance properties . 


A site within Prokofiev crater identified as containing widespread surface water ice exhibits a cratered texture that resembles the neighboring sunlit surface except for its uniformly higher reflectance , indicating that the surficial ice was emplaced after formation of the underlying craters . 


In areas where water ice is inferred to be present but covered by a thin layer of dark , organic-rich volatile material, regions with uniformly lower reflectance extend to the edges of the shadowed areas and terminate with sharp boundaries . The sharp boundaries indicate that the volatile deposits at Mercury's poles are geologically young , relative to the time scale for lateral mixing by impacts, and either are restored at the surface through an ongoing process or were delivered to the planet recently .


Full Article:

http://geology.gsapubs.org/content/early/2014/10/14/G35916.1.abstract

KEYWORDS

SHARE & LIKE

COMMENTS

ABOUT THE AUTHOR

Johns Hopkins University

0 Following 0 Fans 0 Projects 13 Articles

SIMILAR ARTICLES

AbstractBackgroundBeing able to investigate the relationship between underage drinkers' preferences for particular brands and their exposure to adverti

Read More

ABSTRACTImportance Diabetic macular edema (DME) is a leading cause of vision loss in persons with diabetes mellitus. Although there are national estim

Read More

AbstractSpecies of Clostridium bacteria are notable for their ability to lyse tumor cells growing in hypoxic environments . We show that an attenuated

Read More

AbstractLubrication is key for the efficient function of devices and tissues with moving surfaces , such as articulating joints, ocular surfaces and th

Read More

ABSTRACTImportance Opioid analgesic overdose mortality continues to rise in the United States, driven by increases in prescribing for chronic pain. Be

Read More

AbstractStem cell therapy has shown promise in treating a variety of pathologies including skin wounds, but practical applications remain elusive. Here

Read More

BackgroundSocial anxiety disorder—a chronic and naturally unremitting disease that causes substantial impairment—can be treated with pharmacological ,

Read More

AbstractOsteogenesis during bone modeling and remodeling is coupled with angiogenesis . A recent study showed that a specific vessel subtype, strongly

Read More

ABSTRACTOBJECTIVE : To estimate the diagnostic accuracy of electronic fetal heart rate abnormalities in the identification of neonates with encephalopa

Read More

BackgroundSupply-side reductions to the calories in chain restaurants are a possible benefit of upcoming menu labeling requirements .PurposeTo describe

Read More