Elias N. Mansbach's research while affiliated with Massachusetts Institute of Technology and other places

... formation consists of various members discussed in further detail in Stack et al. (2024). 142 A key goal of the Perseverance rover is to acquire ∼30 rock samples that could be returned 143 to Earth for further laboratory analysis in the 2030s (Farley et al., 2020;Weiss et al., 2024). Unlike 144 most Martian meteorites, these cores have known geologic contexts, absolute orientations (Weiss 145 et al., 2024), and are less likely to not have experienced shocks (and associated heating) nor 146 remagnetization from weathering or hand magnets on Earth. ...

... In agreement with previous models, micromagnetic results presented in this study indicate that SV domain states formed in taenite undergo series of modifications driven by the chemical ordering of tetrataenite (Einsle et al., 2018). We conclude, therefore, that any previous paleomagnetic recordings within the thermally stable taenite precursor SV states are reset upon tetrataenite ordering, implying that in intermediate regions in the CZ of slowly cooled meteorites (island sizes ∼50-150 nm; Goldstein et al., 2014;, and possibly in coarse-grained tetrataenite-containing plessite (Mansbach et al., 2022(Mansbach et al., , 2023, inheritance of magnetic remanence from taenite precursor does not occur. Moreover, the drop in the thermomagnetic recording stability around ∼80% to ∼90% of tetrataenite chemical ordering (Figures 3c and 3d) and subsequent reestablishment of high stability indicates, therefore, that coarse grains record a new magnetization state when tetrataenite ordering is almost complete. ...

... Paleomagnetic records preserved in meteorites provide compelling evidence that their parent bodies once had liquid cores capable of generating dynamo fields (Bryson et al., 2015(Bryson et al., , 2017Maurel et al., 2020;Tarduno et al., 2012). Records of ancient dynamo activity in meteorites are preserved by ferromagnetic minerals that can, upon cooling, grain growth or chemical transformation, record a natural remanent magnetization, which can potentially be preserved over the age of the solar system (Devienne et al., 2023;Mansbach et al., 2022;Nagy et al., 2019;Shah et al., 2018). Taenite and tetrataenite are ferromagnetic minerals commonly observed in (stony-) iron meteorite groups that are promising candidates to provide reliable paleomagnetic information in extraterrestrial materials (Bryson, Church, et al., 2014;Uehara & Nakamura, 2006). ...

... However, given the practical detection limits, we strongly recommend the use of focused ion beam nanotomography and/or correlative transmission electron microscopy to confirm directly the presence of primary remanence carriers in the sub 300 nm range as part of targeted paleomagnetic workflows (e.g., 6,32,39,40,44,45 ). Beyond zircon, we envisage X-ray ptycho-tomography could play a major role in the characterization of other important single-crystal targets, including quartz, feldspar, olivine, pyroxene, rutile and baddeleyite in terrestrial and extraterrestrial rocks, chondrules, calcium-aluminium-rich inclusions 46 and aqueously altered matrix regions in chondritic meteorites. The spatial resolution and detectability of magnetite makes ptycho-tomography a suitable approach for the in-situ study of giant magnetofossils in marine sediments 47 and could potentially even detect conventional magnetofossils when combined with the dual-mode approaches outlined here and the increased phase contrast between magnetite and low-density sedimentary grains [e.g., 29 ]. ...

... Paleomagnetism is an essential tool for understanding planetary core dynamos (Fu et al., 2012;Mighani et al., 2020;Tikoo et al., 2017), the formation and evolution of the early Solar System (Borlina et al., 2021(Borlina et al., , 2022Fu et al., 2021;Sato et al., 2022;Wang et al., 2017;Weiss et al., 2021), and planetary accretion and differentiation Mansbach et al., 2023;Maurel et al., 2020). Accurate paleointensity estimates from planetary samples are crucial for studying these processes. ...

... All 24 archaeointensity specimens prepared from eight different bricks in LC08 met the acceptance criteria, which is an exceptional success rate (Fig. 12). The mean archaeointensity and the standard deviation of LC08 were calculated using the method described in Shaar et al. (2020) and are marked in blue in Fig. 13a ( Table 2) Fig. 12: Representative results of paleointensity experiments all carried out on a specific specimen: a) a representative Arai plot, where blue circles, red circles and triangles represent IZ steps, ZI steps and pTRM checks, respectively; the inset displays the Zijderveld (1967) plot of all the demagnetisation steps; the nearly ideal behaviour is characterised by a straight Zijderveld plot converging to the origin (inset), a nearly linear Arai plot and pTRM checks (triangles) which overlap the infield data points (red circles); the Zijderveld plot (inset) represents the projection of the vector on two different planes; b) the magnetisation after the different steps of the paleointensity experiment; the Y-axis represents the magnetisation normalised to the initial magnetisation of the specimen; the X-axis represents the temperature steps; the blue graph represents the initial magnetisation recorded in the past; it starts at 1.0 by definition and decreases gradually; note that the magnetisation is nearly entirely erased only at 600 °C; the red graph represents the magnetisation recorded in the lab, starting at 0.0 by definition and rising with the rising temperature steps; c) a representative result of a cooling rate correction experiment ; the blue line and light blue area represent the mean PI of LC08 and its standard deviation, accordingly; they are presented along all the prior age range of LC08 (1800-680 BCE); the intensity of the geomagnetic field at Lachish in 1980 CE (83 ZAm^2) is marked by a dashed green line; b) the result of the archaeomagnetic dating of LC08: the prior age range of LC08 which was used by the AH-RJMCMC algorithm (Livermore et al. 2018) is represented as a uniform probability density function (grey background); the posterior age probability distribution for LC08 is displayed in blue along with the intensity of the field in 1980 CE. The result of the archaeomagnetic dating of LC08 is presented in Fig. 13b. ...