Pack, Andreas

[["dc.bibliographiccitation.journal","Rapid Communications in Mass Spectrometry : RCM"],["dc.contributor.author","Adnew, Getachew A."],["dc.contributor.author","Hofmann, Magdalena E. G."],["dc.contributor.author","Paul, Dipayan"],["dc.contributor.author","Laskar, Amzad"],["dc.contributor.author","Surma, Jakub"],["dc.contributor.author","Albrecht, Nina"],["dc.contributor.author","Pack, Andreas"],["dc.contributor.author","Schwieters, Johannes"],["dc.contributor.author","Koren, Gerbrand"],["dc.contributor.author","Peters, Wouter"],["dc.contributor.author","Röckmann, Thomas"],["dc.date.accessioned","2019-07-24T06:59:58Z"],["dc.date.available","2019-07-24T06:59:58Z"],["dc.date.issued","2019"],["dc.description.abstract","Determination of δ17 O values directly from CO2 with traditional gas source isotope ratio mass spectrometry is not possible due to isobaric interference of 13 C16 O16 O on 12 C17 O16 O. The methods developed so far use either chemical conversion or isotope equilibration to determine the δ17 O value of CO2 . In addition, δ13 C measurements require correction for the interference from 12 C17 O16 O on 13 C16 O16 O since it is not possible to resolve the two isotopologues."],["dc.identifier.doi","10.1002/rcm.8478"],["dc.identifier.pmid","31063233"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16564"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61954"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.intern","In goescholar not merged with http://resolver.sub.uni-goettingen.de/purl?gs-1/16764 but duplicate"],["dc.relation.eissn","1097-0231"],["dc.relation.issn","0951-4198"],["dc.relation.issn","1097-0231"],["dc.rights","CC BY 4.0"],["dc.rights.access","openAccess"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject.ddc","550"],["dc.title","Determination of the triple oxygen and carbon isotopic composition of CO2 from atomic ion fragments formed in the ion source of the 253 Ultra High-Resolution Isotope Ratio Mass Spectrometer"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","4"],["dc.bibliographiccitation.journal","Geochemical Transactions"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Pack, Andreas"],["dc.contributor.author","Kremer, Katrina"],["dc.contributor.author","Albrecht, Nina"],["dc.contributor.author","Simon, Klaus"],["dc.contributor.author","Kronz, Andreas"],["dc.date.accessioned","2018-11-07T08:39:05Z"],["dc.date.available","2018-11-07T08:39:05Z"],["dc.date.issued","2010"],["dc.description.abstract","Background: In aerodynamic levitation, solids and liquids are floated in a vertical gas stream. In combination with CO2 laser heating, containerless melting at high temperature of oxides and silicates is possible. We apply aerodynamic levitation to bulk rocks in preparation for microchemical analyses, and for evaporation and reduction experiments. Results: Liquid silicate droplets (similar to 2 mm) were maintained stable in levitation using a nozzle with a 0.8 mm bore and an opening angle of 60 degrees. The gas flow was similar to 250 ml min(-1). Rock powders were melted and homogenized for microchemcial analyses. Laser melting produced chemically homogeneous glass spheres. Only highly (e.g. H2O) and moderately volatile components (Na, K) were partially lost. The composition of evaporated materials was determined by directly combining levitation and inductively coupled plasma mass spectrometry. It is shown that the evaporated material is composed of Na > K >> Si. Levitation of metal oxide-rich material in a mixture of H-2 and Ar resulted in the exsolution of liquid metal. Conclusions: Levitation melting is a rapid technique or for the preparation of bulk rock powders for major, minor and trace element analysis. With exception of moderately volatile elements Na and K, bulk rock analyses can be performed with an uncertainty of +/- 5% relative. The technique has great potential for the quantitative determination of evaporated materials from silicate melts. Reduction of oxides to metal is a means for the extraction and analysis of siderophile elements from silicates and can be used to better understand the origin of chondritic metal."],["dc.identifier.doi","10.1186/1467-4866-11-4"],["dc.identifier.isi","000283299700001"],["dc.identifier.pmid","20875118"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18906"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1467-4866"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Description of an aerodynamic levitation apparatus with applications in Earth sciences"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","229"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Meteoritics and Planetary Science"],["dc.bibliographiccitation.lastpage","242"],["dc.bibliographiccitation.volume","50"],["dc.contributor.author","Hezel, Dominik C."],["dc.contributor.author","Poole, Graeme M."],["dc.contributor.author","Hoyes, Jack"],["dc.contributor.author","Coles, Barry J."],["dc.contributor.author","Unsworth, Catherine"],["dc.contributor.author","Albrecht, Nina"],["dc.contributor.author","Smith, Caroline"],["dc.contributor.author","Rehkaemper, Mark"],["dc.contributor.author","Pack, Andreas"],["dc.contributor.author","Genge, Matthew"],["dc.contributor.author","Russell, Sara S."],["dc.date.accessioned","2018-11-07T10:01:23Z"],["dc.date.available","2018-11-07T10:01:23Z"],["dc.date.issued","2015"],["dc.description.abstract","Meteorite fusion crust formation is a brief event in a high-temperature (2000-12,000K) and high-pressure (2-5MPa) regime. We studied fusion crusts and bulk samples of 10 ordinary chondrite falls and 10 ordinary chondrite finds. The fusion crusts show a typical layering and most contain vesicles. All fusion crusts are enriched in heavy Fe isotopes, with Fe-56 values up to +0.35 parts per thousand relative to the solar system mean. On average, the Fe-56 of fusion crusts from finds is +0.23 parts per thousand, which is 0.08 parts per thousand higher than the average from falls (+0.15 parts per thousand). Higher Fe-56 in fusion crusts of finds correlate with bulk chondrite enrichments in mobile elements such as Ba and Sr. The Fe-56 signature of meteorite fusion crusts was produced by two processes (1) evaporation during atmospheric entry and (2) terrestrial weathering. Fusion crusts have either the same or higher O-18 (0.9-1.5 parts per thousand) than their host chondrites, and the same is true for O-17. The differences in bulk chondrite and fusion crust oxygen isotope composition are explained by exchange of oxygen between the molten surface of the meteorites with the atmosphere and weathering. Meteorite fusion crust formation is qualitatively similar to conditions of chondrule formation. Therefore, fusion crusts may, at least to some extent, serve as a natural analogue to chondrule formation processes. Meteorite fusion crust and chondrules exhibit a similar extent of Fe isotope fractionation, supporting the idea that the Fe isotope signature of chondrules was established in a high-pressure environment that prevented large isotope fractionations. The exchange of O between a chondrule melt and an O-16-poor nebula as the cause for theobserved nonmass dependent O isotope compositions in chondrules is supported by the same process, although to a much lower extent, in meteorite fusion crusts."],["dc.description.sponsorship","Paneth Trust"],["dc.identifier.doi","10.1111/maps.12414"],["dc.identifier.isi","000350120100004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38010"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1945-5100"],["dc.relation.issn","1086-9379"],["dc.title","Fe and O isotope composition of meteorite fusion crusts: Possible natural analogues to chondrule formation?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]