Matches in SemOpenAlex for { <https://semopenalex.org/work/W2602874089> ?p ?o ?g. }
- W2602874089 endingPage "297" @default.
- W2602874089 startingPage "277" @default.
- W2602874089 abstract "Martian meteorites are the only samples available from the surface of Mars. Among them, olivine-phyric shergottites are basalts containing large zoned olivine crystals with highly magnesian cores (Fo 70–85) and rims richer in Fe (Fo 45–60). The Northwest Africa 1068 meteorite is one of the most primitive “enriched” shergottites (high initial 87Sr/86Sr and low initial ε143Nd). It contains olivine crystals as magnesian as Fo 77 and is a major source of information to constrain the composition of the parental melt, the composition and depth of the mantle source, and the cooling and crystallization history of one of the younger magmatic events on Mars (∼180 Ma). In this study, Fe-Mg isotope profiles analyzed in situ by femtosecond-laser ablation MC-ICP-MS are combined with compositional profiles of major and trace elements in olivine megacrysts. The cores of olivine megacrysts are enriched in light Fe isotopes (δ56FeIRMM-14 = −0.6 to −0.9‰) and heavy Mg isotopes (δ26MgDSM-3 = 0–0.2‰) relative to megacryst rims and to the bulk martian isotopic composition (δ56Fe = 0 ± 0.05‰, δ26Mg = −0.27 ± 0.04‰). The flat forsterite profiles of megacryst cores associated with anti-correlated fractionation of Fe-Mg isotopes indicate that these elements have been rehomogenized by diffusion at high temperature. We present a 1-D model of simultaneous diffusion and crystal growth that reproduces the observed element and isotope profiles. The simulation results suggest that the cooling rate during megacryst core crystallization was slow (43 ± 21 °C/year), and consistent with pooling in a deep crustal magma chamber. The megacryst rims then crystallized 1–2 orders of magnitude faster during magma transport toward the shallower site of final emplacement. Megacryst cores had a forsterite content 3.2 ± 1.5 mol% higher than their current composition and some were in equilibrium with the whole-rock composition of NWA 1068 (Fo 80 ± 1.5). NWA 1068 composition is thus close to a primary melt (i.e. in equilibrium with the mantle) from which other enriched shergottites derived." @default.
- W2602874089 created "2017-04-07" @default.
- W2602874089 creator A5053113495 @default.
- W2602874089 creator A5067809998 @default.
- W2602874089 creator A5083347283 @default.
- W2602874089 creator A5083394434 @default.
- W2602874089 creator A5084881085 @default.
- W2602874089 creator A5090845644 @default.
- W2602874089 date "2017-06-01" @default.
- W2602874089 modified "2023-10-16" @default.
- W2602874089 title "Crystallization history of enriched shergottites from Fe and Mg isotope fractionation in olivine megacrysts" @default.
- W2602874089 cites W1008898031 @default.
- W2602874089 cites W1524079998 @default.
- W2602874089 cites W1571112900 @default.
- W2602874089 cites W1832204395 @default.
- W2602874089 cites W1858434880 @default.
- W2602874089 cites W1966397334 @default.
- W2602874089 cites W1973941169 @default.
- W2602874089 cites W1977643290 @default.
- W2602874089 cites W1979891355 @default.
- W2602874089 cites W1981370117 @default.
- W2602874089 cites W1982138141 @default.
- W2602874089 cites W1985341193 @default.
- W2602874089 cites W1987078617 @default.
- W2602874089 cites W1988430460 @default.
- W2602874089 cites W1992926644 @default.
- W2602874089 cites W1994919247 @default.
- W2602874089 cites W1995728876 @default.
- W2602874089 cites W2007935173 @default.
- W2602874089 cites W2011172116 @default.
- W2602874089 cites W2013367244 @default.
- W2602874089 cites W2014783846 @default.
- W2602874089 cites W2016082559 @default.
- W2602874089 cites W2017853565 @default.
- W2602874089 cites W2019191502 @default.
- W2602874089 cites W2019454371 @default.
- W2602874089 cites W2021271176 @default.
- W2602874089 cites W2022052744 @default.
- W2602874089 cites W2022970992 @default.
- W2602874089 cites W2024449021 @default.
- W2602874089 cites W2025356609 @default.
- W2602874089 cites W2025726120 @default.
- W2602874089 cites W2027465448 @default.
- W2602874089 cites W2033492741 @default.
- W2602874089 cites W2033620099 @default.
- W2602874089 cites W2040807950 @default.
- W2602874089 cites W2041398136 @default.
- W2602874089 cites W2043150294 @default.
- W2602874089 cites W2045038055 @default.
- W2602874089 cites W2045422306 @default.
- W2602874089 cites W2046193477 @default.
- W2602874089 cites W2046518383 @default.
- W2602874089 cites W2048091267 @default.
- W2602874089 cites W2049905979 @default.
- W2602874089 cites W2056420902 @default.
- W2602874089 cites W2056576190 @default.
- W2602874089 cites W2057683220 @default.
- W2602874089 cites W2058484309 @default.
- W2602874089 cites W2059392965 @default.
- W2602874089 cites W2060401165 @default.
- W2602874089 cites W2060544592 @default.
- W2602874089 cites W2060692092 @default.
- W2602874089 cites W2063711302 @default.
- W2602874089 cites W2068072498 @default.
- W2602874089 cites W2070519240 @default.
- W2602874089 cites W2072062807 @default.
- W2602874089 cites W2072310385 @default.
- W2602874089 cites W2078395629 @default.
- W2602874089 cites W2080450095 @default.
- W2602874089 cites W2080474245 @default.
- W2602874089 cites W2082795738 @default.
- W2602874089 cites W2086016364 @default.
- W2602874089 cites W2088978749 @default.
- W2602874089 cites W2092602839 @default.
- W2602874089 cites W2098354503 @default.
- W2602874089 cites W2101619099 @default.
- W2602874089 cites W2104138264 @default.
- W2602874089 cites W2110510775 @default.
- W2602874089 cites W2113566921 @default.
- W2602874089 cites W2118936252 @default.
- W2602874089 cites W2122408328 @default.
- W2602874089 cites W2132951786 @default.
- W2602874089 cites W2134594170 @default.
- W2602874089 cites W2141681791 @default.
- W2602874089 cites W2142892031 @default.
- W2602874089 cites W2149708143 @default.
- W2602874089 cites W2154662170 @default.
- W2602874089 cites W2163393460 @default.
- W2602874089 cites W2170352494 @default.
- W2602874089 cites W2286674568 @default.
- W2602874089 cites W2287076418 @default.
- W2602874089 cites W2300626709 @default.
- W2602874089 cites W2319156823 @default.
- W2602874089 cites W2335459763 @default.
- W2602874089 cites W2405422102 @default.
- W2602874089 cites W2411786744 @default.
- W2602874089 cites W2460150662 @default.
- W2602874089 cites W2528376957 @default.