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Showing 1 to 9 of 9 for “"impact melt"”.
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Impact Melt-Bearing Deposits Around Martian Craters
In this work, we investigate impact melt emplacement around Martian craters. We compare our results to melt emplacement processes found on Venus, the Moon, and Mercury. We tentatively find Martian melt emplacement more closely resembles Venusian emplacement, rather than lunar emplacement. This …
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Differentiation in impact melt sheets as a mechanism to produce evolved magmas on Mars
<p>Asteroid bombardment contributed to extensive melting and resurfacing of ancient (> 3 Ga) Mars, thereby influencing the early evolution of the Martian crust. However, information about how impact melting has altered Mars’ crustal petrology is limited. Evidence from some of the largest impact …
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Characterization of Impact Melt Rocks and Hydrothermal Mineralization at the Haughton Impact Structure, Devon Island, Canada: An Investigation of Impacts into Carbonate Targets
Impact cratering is a fundamental and ubiquitous geological process on all solid planetary bodies in our solar system. Impacts into carbonate-rich sedimentary target rocks on Earth are still poorly understood. The fate of carbonates during impact, in particular whether they undergo melting or …
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A Targeted Investigation of the Upper Contact Unit of the Sudbury Igneous Complex in the North Range, Sudbury Impact Structure, Canada
… (SIC) represents the remnant of a crystalline impact melt sheet of the Sudbury impact structure; and is historically and presently a strategic exploration target sustaining the region's prolific mining camp. In order to better understand the SIC, it is critical to investigate the chilled upper …
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Exploring the Enstatite Chondrites: Modal Abundances, Metamorphic History, and Volatile Challenges
… asteroid: contact metamorphism driven by an impact melt sheet. Chapter 3 integrates bulk, in situ, and isotopic volatile measurements, demonstrating that most detected hydrogen (H) is terrestrial contamination rather than indigenous. However, modeling the H budget of an EC-like parent body …
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Review of the mechanical properties of lunar soils
… regolith is comprised of a mixture of basalt, impact melt glasses, breccias and agglutinate particles, and is derived from processes related to surface impacts and volcanic activity. The soil itself has a particle size distribution that resembles a well graded silty sand with angular particles …
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Carbon Chemistry Of Giant Impacts
Impact diamonds were found in several impactites from the Ries crater, Germany including fallout and fallback (crater fill) suevites. a glass bomb, impact melt rock and shocked gneiss. These diamonds formed two distinct grain size populations: 50-300µm apographitic. platy aggregates with surface …
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Emplacement of sharp-walled sulphide veins during reactivation of impact-related structures at the Broken Hammer Mine, Sudbury, Ontario
… in the North Range of the ca. 1.85 Ga Sudbury impact structure. The sulphide vein system and associated low sulphide PGE mineralization were mined as an open pit operation over a 15-month period, providing a unique opportunity to study a complete 90-meter vertical section across a footwall …
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U-Th-Pb AGES OF HIGH-GRADE METAMORPHISM RECORDED IN POLYMICT EUCRITE LEWIS CLIFF (LEW) 85300
… solar system experienced an apparent increase in impact intensity almost a billion years after planet formation as predicted from Ar-Ar data of impact metamorphosed materials and crater density analyses. Evidence of this apparent increase in impact rate (the ‘late heavy bombardment’ or LHB) are …