FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2152074861> ?p ?o ?g. }

• W2152074861 endingPage "164" @default.
• W2152074861 startingPage "105" @default.
• W2152074861 abstract "We review the radiometric ages of the 16 currently known Martian meteorites, classified as 11 shergottites (8 basaltic and 3 lherzolitic), 3 nakhlites (clinopyroxenites), Chassigny (a dunite), and the orthopyroxenite ALH84001. The basaltic shergottites represent surface lava flows, the others magmas that solidified at depth. Shock effects correlate with these compositional types, and, in each case, they can be attributed to a single shock event, most likely the meteorite’s ejection from Mars. Peak pressures in the range 15 – 45 GPa appear to be a “launch window”: shergottites experienced ~ 30 – 45 GPa, nakhlites ~ 20 ± 5 GPa, Chassigny ~35 GPa, and ALH84001 ~35 – 40 GPa. Two meteorites, lherzolitic shergottite Y-793605 and orthopyroxenite ALH84001, are monomict breccias, indicating a two-phase shock history in toto: monomict brecciation at depth in a first impact and later shock metamorphism in a second impact, probably the ejection event. Crystallization ages of shergottites show only two pronounced groups designated S1 (~175 Myr), including 4 of 6 dated basalts and all 3 lherzolites, and S2 (330 – 475 Myr), including two basaltic shergottites and probably a third according to preliminary data. Ejection ages of shergottites, defined as the sum of their cosmic ray exposure ages and their terrestrial residence ages, range from the oldest (~20 Myr) to the youngest (~0.7 Myr) values for Martian meteorites. Five groups are distinguished and designated SDho (one basalt, ~20 Myr), SL (two lherzolites of overlapping ejection ages, 3.94 ± 0.40 Myr and 4.70 ± 0.50 Myr), S (four basalts and one lherzolite, ~2.7 – 3.1 Myr), SDaG(two basalts, ~1.25 Myr), and SE (the youngest basalt, 0.73 ± 0.15 Myr). Consequently, crystallization age group S1 includes ejection age groups SL, SE and 4 of the 5 members of S, whereas S2 includes the remaining member of S and one of the two members of SDaG. Shock effects are different for basalts and lherzolites in group S/S1. Similarities to the dated meteorite DaG476 suggest that the two shergottites that are not dated yet belong to group S2. Whether or not S2 is a single group is unclear at present. If crystallization age group S1 represents a single ejection event, pre-exposure on the Martian surface is required to account for ejection ages of SL that are greater than ejection ages of S, whereas secondary breakup in space is required to account for ejection ages of SE less than those of S. Because one member of crystallization age group S2 belongs to ejection group S, the maximum number of shergottite ejection events is 6, whereas the minimum number is 2. Crystallization ages of nakhlites and Chassigny are concordant at ~1.3 Gyr. These meteorites also have concordant ejection ages, i.e., they were ejected together in a single event (NC). Shock effects vary within group NC between the nakhlites and Chassigny. The orthopyroxenite ALH84001 is characterized by the oldest crystallization age of ~4.5 Gyr. Its secondary carbonates are ~3.9 Gyr old, an age corresponding to the time of Ar-outgassing from silicates. Carbonate formation appears to have coincided with impact metamorphism, either directly, or indirectly, perhaps via precipitation from a transient impact crater lake. The crystallization age and the ejection age of ALH84001, the second oldest ejection age at 15.0 ± 0.8 Myr, give evidence for another ejection event (0). Consequently, the total number of ejection events for the 16 Martian meteorites lies in the range 4 – 8. The Martian meteorites indicate that Martian magmatism has been active over most of Martian geologic history, in agreement with the inferred very young ages of flood basalt flows observed in Elysium and Amazonis Planitia with the Mars Orbital Camera (MOC) on the Mars Global Surveyor (MGS). The provenance of the youngest meteorites must be found among the youngest volcanic surfaces on Mars, i.e., in the Tharsis, Amazonis, and Elysium regions." @default.
• W2152074861 created "2016-06-24" @default.
• W2152074861 creator A5001352130 @default.
• W2152074861 creator A5018979245 @default.
• W2152074861 creator A5023628945 @default.
• W2152074861 creator A5036524823 @default.
• W2152074861 creator A5041602963 @default.
• W2152074861 creator A5042660678 @default.
• W2152074861 date "2001-01-01" @default.
• W2152074861 modified "2023-09-30" @default.
• W2152074861 title "Ages and Geologic Histories of Martian Meteorites" @default.
• W2152074861 cites W1503562354 @default.
• W2152074861 cites W1935527374 @default.
• W2152074861 cites W1964147580 @default.
• W2152074861 cites W1966383562 @default.
• W2152074861 cites W1967220311 @default.
• W2152074861 cites W1967737183 @default.
• W2152074861 cites W1968713120 @default.
• W2152074861 cites W1969628171 @default.
• W2152074861 cites W1972133040 @default.
• W2152074861 cites W1972228827 @default.
• W2152074861 cites W1973305168 @default.
• W2152074861 cites W1973363072 @default.
• W2152074861 cites W1974075852 @default.
• W2152074861 cites W1974409171 @default.
• W2152074861 cites W1975117309 @default.
• W2152074861 cites W1977970536 @default.
• W2152074861 cites W1979198439 @default.
• W2152074861 cites W1979285904 @default.
• W2152074861 cites W1979419973 @default.
• W2152074861 cites W1979696967 @default.
• W2152074861 cites W1979749784 @default.
• W2152074861 cites W1980354234 @default.
• W2152074861 cites W1980356926 @default.
• W2152074861 cites W1980705055 @default.
• W2152074861 cites W1982898366 @default.
• W2152074861 cites W1983485298 @default.
• W2152074861 cites W1983702818 @default.
• W2152074861 cites W1984241839 @default.
• W2152074861 cites W1985248732 @default.
• W2152074861 cites W1988633302 @default.
• W2152074861 cites W1988939119 @default.
• W2152074861 cites W1989740476 @default.
• W2152074861 cites W1991009883 @default.
• W2152074861 cites W1992308813 @default.
• W2152074861 cites W1993212942 @default.
• W2152074861 cites W1993357164 @default.
• W2152074861 cites W1993722172 @default.
• W2152074861 cites W1996782391 @default.
• W2152074861 cites W1997661031 @default.
• W2152074861 cites W2000383413 @default.
• W2152074861 cites W2006237547 @default.
• W2152074861 cites W2007020617 @default.
• W2152074861 cites W2007602037 @default.
• W2152074861 cites W2009565796 @default.
• W2152074861 cites W2010353627 @default.
• W2152074861 cites W2010708669 @default.
• W2152074861 cites W2012165781 @default.
• W2152074861 cites W2015527356 @default.
• W2152074861 cites W2017159535 @default.
• W2152074861 cites W2017447046 @default.
• W2152074861 cites W2019177556 @default.
• W2152074861 cites W2019256198 @default.
• W2152074861 cites W2021648887 @default.
• W2152074861 cites W2022175403 @default.
• W2152074861 cites W2024430005 @default.
• W2152074861 cites W2024862469 @default.
• W2152074861 cites W2026761972 @default.
• W2152074861 cites W2028424955 @default.
• W2152074861 cites W2029966097 @default.
• W2152074861 cites W2030670509 @default.
• W2152074861 cites W2031891762 @default.
• W2152074861 cites W2032178071 @default.
• W2152074861 cites W2033962534 @default.
• W2152074861 cites W2037372977 @default.
• W2152074861 cites W2038403070 @default.
• W2152074861 cites W2038643314 @default.
• W2152074861 cites W2039172699 @default.
• W2152074861 cites W2039861177 @default.
• W2152074861 cites W2040558407 @default.
• W2152074861 cites W2044138916 @default.
• W2152074861 cites W2044727490 @default.
• W2152074861 cites W2045613008 @default.
• W2152074861 cites W2046518383 @default.
• W2152074861 cites W2047067159 @default.
• W2152074861 cites W2047574019 @default.
• W2152074861 cites W2051209851 @default.
• W2152074861 cites W2051548229 @default.
• W2152074861 cites W2051876814 @default.
• W2152074861 cites W2052232122 @default.
• W2152074861 cites W2052631289 @default.
• W2152074861 cites W2054160977 @default.
• W2152074861 cites W2058259978 @default.
• W2152074861 cites W2061138336 @default.
• W2152074861 cites W2066389433 @default.
• W2152074861 cites W2066506241 @default.
• W2152074861 cites W2066614575 @default.
• W2152074861 cites W2067679711 @default.

• next