The effects of Antarctic alteration and sample heterogeneity on Sm-Nd and Lu-Hf systematics in H chondrites

Quantitative elemental mapping of chondritic meteorites using laser ablation-inductively coupled plasma-time of flight-mass spectrometry (LA-ICP-TOF-MS)

“…The same polished thick sections (PTSs) as those studied in Maeda et al (2021) 24 were used for the analyses described below. Additionally, PTSs for Jilin (H5), Nuevo Mercurio (H5), Richardton (H5), and Butsura (H6) were allocated by the Royal Belgian Institute of Natural Sciences (RBINS), Belgium, and prepared for these analyses.…”

“…aSee Maeda et al (2021) 24 for the details of the type and weathering index.bNinagawa et al (2005). 25 …”

“…These analyses have been described in detail in Maeda et al (2021). 24 The PTSs of 12 samples (A-880941, A-881258, A 09436, A 09387, NWA 6771, Jilin, Nuevo Mercurio, Richardton, A 09618, Butsura, A 09516, and Y-790960) were analyzed using pulse-resolved multi-elemental LA-ICP-TOF-MS mapping at Ghent University, Belgium. Two LA-units equipped with a 193 nm ArF* excimer-based nanosecond lasing system were used: a customized Teledyne Photon Machines Analyte G2 and a commercially available Teledyne Photon Machines Iridia LA-unit equipped with a prototype and commercially available version of the cobalt ablation chamber, respectively.…”

“…To avoid matrix effects as much as possible, especially in the case of the phosphate phases, phases of silicates, phosphates, and the others were differently calibrated using all the MPI-DING and USGS glasses, the Durango apatite only, and all the MPI-DING and USGS glasses combined with the Durango apatite, respectively. The following nuclides were used for the quantication: 23 Na, 24 Mg, 27 Al, 28 Si, 31 P, 39 K, 43 Ca, 45 Sc, 49 Ti, 51 V, 52 Cr, 55 232 Th, and 238 U. BHVO-2G, GOR128-G, and the Durango apatite were also quantied using the same procedures for the validation of this analysis. Incidentally, BHVO-2G and GOR128-G were calibrated as silicate phase while the Durango apatite was calibrated as phosphate phase.…”

Artificial weathering of an ordinary chondrite: Recommendations for the curation of Antarctic meteorites

“…The most visible weathering products on meteorites are evaporites and rust (mainly Fe oxyhydroxides), which result from the precipitation of salts due to water evaporation and corrosion of metal within the rock, respectively (Benoit & Sears, 1999;Bland et al, 2006;Gooding, 1982Gooding, , 1986Jull et al, 1988;Lee & Bland, 2004;Losiak & Velbel, 2011;Velbel, 1988Velbel, , 2014Velbel & Gooding, 1990). Therefore, effects of terrestrial weathering are visible in most Antarctic meteorites, albeit to a much lower extent than in meteorites recovered under a more humid and/or hot climate (Bland et al, 2006;Maeda et al, 2021;Pourkhorsandi et al, 2021). Even though terrestrial weathering is unavoidable, it is nonetheless necessary to preserve collected meteorite samples in an environment that will slow or, ideally, stop its progression.…”