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Analysis of Trace Elements in Troilite from Chondrites and Iron Meteorites

This study investigates trace element concentrations in troilite samples from H chondrites and various iron meteorites. We analyze the copper (Cu) and manganese (Mn) concentrations, noting that while Cu levels are generally above detection limits in all iron meteorites, many H chondrites show Mn values below detection limits. The report includes comparative histograms illustrating variations in Cu concentrations, particularly in Ashmore and Castalia H5 chondrites. Findings contribute to a deeper understanding of the compositional diversity of meteorites, with implications for planetary formation.

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Analysis of Trace Elements in Troilite from Chondrites and Iron Meteorites

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  1. Samples Other Elements Copper H chondrites meteorite classif. sample # Dhajala* H3.8 L6102Brownfield (1937) H3.7 L6991Bath* H4 L3760Forest Vale* H4 M4810Ashmore H5 L3758Castalia* H5 L3767Estacado H6 L3785Tugalin-Bulen* H6 L9826 * fall Iron Meteorites meteorite classif. sample # Toluca IAB M2760Zagora IAB H4826Bohumilitz IABOcotillo IAB M10116Georgetown IIICD+ M5640Watson 001 IIE M5642Cape York IIIAB Soroti* ungr. (FeS-rich) USNM1621 * fall+ alternative classif. IAB-ungr. Titanium and zinc concentrations are generally below detection limit in all troilite samples analyzed. Manganese concentrations in troilite from H chondrites are mostly below detection limit. In general Mn behaves similar to Cr, but due to calibration problems analyses have not yet been fully evaluated. No systematic trend is apparent in the Cu content of troilite.All iron meteorites have Cu concentrations above the detection limit, but troilite with high Cu occurs in some H chondrites as well. Although native Cu is sometimes found embedded in troilite, the variations among troilite from meteorites of the same group (and in the case of chondrites same metamorphic class) cannot be explained in this way. Histograms of Cu concen-trations in troilite from Ashmore and Castalia, bothH5 chondrites, are shown below. Note the different scales. Source of samples:Soroti: NMNH, Smithsonian Institution, Washington, DCall other samples: Naturhistorisches Musem, Vienna, Austria Trace Elements in Meteoritic Troilite Alfred Kracher, Ames Laboratory, Iowa State UniversityAmes, IA 50011-3020, USA.Franz Brandstätter, Naturhistorisches MuseumBurgring 7, A-1010 Vienna, Austria. Results

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