Extracts of impact breccia samples from Sudbury, Gardnos, and Ries impact craters and the effects of aggregation on C60 detection

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doi: 10.1016/j.gca.2004.11.023
Authors:Elsila, J. E.; de Leon, N. P.; Plows, F. L.; Buseck, P. R.; Zare, Richard N.
Author Affiliations:Primary:
Stanford University, Department of Chemistry, Stanford, CA, United States
Ciphergen Biosystems, United States
Arizona State University, United States
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 69(11), p.2891-2899. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:2005
Note:In English. 54 refs.; illus., incl. 1 table
Summary:Fullerenes have been detected in carbonaceous chondrite meteorites and in breccia samples from meteorite impact craters, but questions have been raised about contradictory results from similar samples and the sensitivities and accuracies of different analytical methods. We analyzed samples from three impact craters and detected C60 in samples from several locations; we also observed differences in the detection capabilities of various analytical techniques used in the search for fullerenes. The presence of C60 in rocks from the Onaping Formation of the Sudbury impact crater was confirmed. Low levels of C60 were also detected for the first time in samples from the Gardnos (Norway) and Ries (Germany) impact structures. We detected C60 in these samples using surface-enhanced laser desorption/ ionization (SELDI), but the related technique of microprobe laser-desorption, laser-ionization mass spectrometry (µL2MS) did not observe C60 above detection limits. We attribute the absence of µL2MS signal to aggregate formation caused by phthalic acid esters, which appear to easily contaminate samples either during storage or demineralization in plastic containers. The µL2MS technique is incapable of detecting aggregated C60, but aggregation does not suppress detection in SELDI. Phthalate-induced aggregation did, however, enhance SELDI detection of C60 in some cases, and we suggest that this enhancement may help explain previously reported differences in C60 detection from natural samples between laser desorption mass spectrometry (LDMS, a technique analogous to SELDI that has detected fullerenes in meteorite and impact breccia samples) and high-pressure liquid chromatography (HPLC). This work highlights the effects of phthalates and other indigenous compounds or contaminants on certain mass spectrometric techniques and lends support to the idea that several complementary analytical methods should be employed to investigate complex natural samples. Abstract Copyright (2005) Elsevier, B.V.
Sections:Meteorites and tektites
Subjects:Breccia; Carbon; Carbonaceous chondrites; Chondrites; Chromatography; Cosmochemistry; Craters; Fullerene; Geochemistry; Impact craters; Impact features; Isotopes; Mass spectra; Meteorites; Microscope methods; Native elements; Optical mineralogy; Spectra; Stony meteorites; Bavaria Germany; Canada; Central Europe; Eastern Canada; Europe; Germany; Norway; Ontario; Ries Crater; Scandinavia; Sudbury Structure; Western Europe; C-60; Gardnos Crater; SELDI; Surface-enhanced laser desorption/ionization
Coordinates:N462500 N465000 W0804500 W0814000
N484600 N490000 E0104500 E0102300
Abstract Numbers:05M/2548
Record ID:2006022290
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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