Kronz, Andreas

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Paleoceanography and Paleoclimatology"],["dc.bibliographiccitation.volume","37"],["dc.contributor.author","Leclerc, Natasha"],["dc.contributor.author","Halfar, Jochen"],["dc.contributor.author","Hetzinger, Steffen"],["dc.contributor.author","Chan, Phoebe T. W."],["dc.contributor.author","Adey, Walter"],["dc.contributor.author","Tsay, Alexandra"],["dc.contributor.author","Brossier, Eric"],["dc.contributor.author","Kronz, Andreas"],["dc.date.accessioned","2022-04-01T10:02:36Z"],["dc.date.available","2022-04-01T10:02:36Z"],["dc.date.issued","2021"],["dc.identifier.doi","10.1029/2021PA004286"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/105959"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-530"],["dc.relation.eissn","2572-4525"],["dc.relation.issn","2572-4517"],["dc.rights.uri","http://onlinelibrary.wiley.com/termsAndConditions#vor"],["dc.title","Suitability of the Coralline Alga Clathromorphum compactum as an Arctic Archive for Past Sea Ice Cover"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","412"],["dc.bibliographiccitation.journal","Acta Biomaterialia"],["dc.bibliographiccitation.lastpage","424"],["dc.bibliographiccitation.volume","31"],["dc.contributor.author","Schunck, Antje"],["dc.contributor.author","Kronz, Andreas"],["dc.contributor.author","Fischer, Cornelius"],["dc.contributor.author","Buchhorn, Gottfried Hans"],["dc.date.accessioned","2018-11-07T10:18:36Z"],["dc.date.available","2018-11-07T10:18:36Z"],["dc.date.issued","2016"],["dc.description.abstract","In a previous failure analysis performed on femoral components of cemented total hip replacements, we determined high volumes of abraded bone cement. Here, we describe the topography of the polished surface of polymethyl methacrylate (PMMA) bone cement containing zirconia radiopacifier, analyzed by scanning electron microscopy and vertical scanning interferometry. Zirconia spikes protruded about 300 nm from the PMMA matrix, with pits of former crystal deposition measuring about 400 nm in depth. We deduced that the characteristically mulberry-shaped agglomerates of zirconia crystals are ground and truncated into flat surfaces and finally torn out of the PMMA matrix. Additionally, evaluation of in vitro PMMA-on-PMMA articulation confirmed that crystal agglomerations of zirconia were exposed to grain pullout, fatigue, and abrasion. In great quantities, micron-sized PMMA wear and zirconia nanoparticles accumulate in the cement-bone interface and capsular tissues, thereby contributing to osteolysis. Dissemination of nanoparticles to distant lymph nodes and organs of storage has been reported. As sufficient information is lacking, foreign body reactions to accumulated nanosized zirconia in places of long-term storage should be investigated. Statement of Significance The production of wear particles of PMMA bone cement in the interface to joint replacement devices, presents a local challenge. The presence of zirconia particles results in frustrated digestion attempts by macrophages, liberation of inflammatory mediators, and necrosis leading to aseptic inflammation and osteolyses. Attempts to minimize wear of articulating joints reduced the attention to the deterioration of cement cuffs. We therefore investigated polished surfaces of retrieved cuffs to demonstrate their morphology and to measure surface roughness. Industrially admixed agglomerates of the radiopacifier are abraded to micron and nano-meter sized particles. The dissemination of zirconia particles in the reticulo-endothelial system to storage organs is a possible burden. Research to replace the actual contrast media by non-particulate material deserves more attention. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.actbio.2015.11.044"],["dc.identifier.isi","000370086100037"],["dc.identifier.pmid","26612414"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41478"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Sci Ltd"],["dc.relation.issn","1878-7568"],["dc.relation.issn","1742-7061"],["dc.title","Release of zirconia nanoparticles at the metal stem-bone cement interface in implant loosening of total hip replacements"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","307"],["dc.bibliographiccitation.issue","3-4"],["dc.bibliographiccitation.journal","Earth and Planetary Science Letters"],["dc.bibliographiccitation.lastpage","316"],["dc.bibliographiccitation.volume","308"],["dc.contributor.author","Jacob, Dorrit E."],["dc.contributor.author","Wirth, Richard"],["dc.contributor.author","Enzmann, Frieder"],["dc.contributor.author","Kronz, A."],["dc.contributor.author","Schreiber, Andrea"],["dc.date.accessioned","2018-11-07T08:53:13Z"],["dc.date.available","2018-11-07T08:53:13Z"],["dc.date.issued","2011"],["dc.description.abstract","A single polycrystalline diamond aggregate from the Orapa kimberlite (Botswana) contains a syngenetic micro- and nano-inclusion suite of magnetite, pyrrhotite, omphacite, garnet, rutile and C-O-H fluid in order of abundance. This suite of inclusions is distinctly different from those in fibrous diamonds, although the presence of sub-micrometer fluid inclusions provides evidence for a similarly important role of fluids in the genesis of polycrystalline diamond. It is the first study of polycrystalline diamond by High resolution mu-CT (Computed Tomography) reaching a resolution of 1.3 mu m using polychromatic X-rays. Combined with Focused Ion Beam assisted Transmission Electron Microscopy the method reveals epigenetic replacement coatings of hematite and late stage sheet silicates around the magnetites showing that magnetites are often (but not always) interstitial to the diamond and, thus, were open to late stage overprinting. It is proposed that the polycrystalline diamond formed by a redox reaction between a small-scale carbonatitic melt and a sulfide-bearing eclogite. The water released from the melt during diamond precipitation fluxed local melting of the surrounding eclogite, and oxidation of sulfide phases to magnetite, which mingled with the carbonatitic melt and (re-)precipitated locally. (C) 2011 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.epsl.2011.05.056"],["dc.identifier.isi","000293931600005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22356"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","0012-821X"],["dc.title","Nano-inclusion suite and high resolution micro-computed-tomography of polycrystalline diamond (framesite) from Orapa, Botswana"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","431"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Geostandards and Geoanalytical Research"],["dc.bibliographiccitation.lastpage","457"],["dc.bibliographiccitation.volume","42"],["dc.contributor.author","Nasdala, Lutz"],["dc.contributor.author","Corfu, Fernando"],["dc.contributor.author","Schoene, Blair"],["dc.contributor.author","Tapster, Simon R."],["dc.contributor.author","Wall, Corey J."],["dc.contributor.author","Schmitz, Mark D."],["dc.contributor.author","Ovtcharova, Maria"],["dc.contributor.author","Schaltegger, Urs"],["dc.contributor.author","Kennedy, Allen K."],["dc.contributor.author","Kronz, Andreas"],["dc.contributor.author","Reiners, Peter W."],["dc.contributor.author","Yang, Yue-Heng"],["dc.contributor.author","Wu, Fu-Yuan"],["dc.contributor.author","Gain, Sarah E. M."],["dc.contributor.author","Griffin, William L."],["dc.contributor.author","Szymanowski, Dawid"],["dc.contributor.author","Chanmuang N., Chutimun"],["dc.contributor.author","Ende, Martin"],["dc.contributor.author","Valley, John W."],["dc.contributor.author","Spicuzza, Michael J."],["dc.contributor.author","Wanthanachaisaeng, Bhuwadol"],["dc.contributor.author","Giester, Gerald"],["dc.date.accessioned","2020-12-10T18:28:49Z"],["dc.date.available","2020-12-10T18:28:49Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1111/ggr.12239"],["dc.identifier.issn","1639-4488"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/76418"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","GZ7 and GZ8 - Two Zircon Reference Materials for SIMS U-Pb Geochronology"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","96"],["dc.bibliographiccitation.journal","Geochimica et Cosmochimica Acta"],["dc.bibliographiccitation.lastpage","109"],["dc.bibliographiccitation.volume","220"],["dc.contributor.author","Hetzinger, S."],["dc.contributor.author","Halfar, J."],["dc.contributor.author","Kronz, A."],["dc.contributor.author","Simon, K."],["dc.contributor.author","Adey, W.H."],["dc.contributor.author","Steneck, R.S."],["dc.date.accessioned","2020-12-10T14:24:13Z"],["dc.date.available","2020-12-10T14:24:13Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1016/j.gca.2017.09.044"],["dc.identifier.issn","0016-7037"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72185"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Reproducibility of Clathromorphum compactum coralline algal Mg/Ca ratios and comparison to high-resolution sea surface temperature data"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Geochimica et Cosmochimica Acta"],["dc.bibliographiccitation.volume","68"],["dc.contributor.author","Zack, Thomas"],["dc.contributor.author","Rivers, T."],["dc.contributor.author","Brumm, R."],["dc.contributor.author","Kronz, A."],["dc.date.accessioned","2018-11-07T10:48:26Z"],["dc.date.available","2018-11-07T10:48:26Z"],["dc.date.issued","2004"],["dc.format.extent","A600"],["dc.identifier.isi","000221923401061"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48193"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.publisher.place","Oxford"],["dc.relation.conference","14th Annual V M Goldschmidt Conference"],["dc.relation.eventlocation","Univ Copenhagen, Copenhagen, DENMARK"],["dc.relation.issn","0016-7037"],["dc.title","Lawsonite eclogite from the Dominican Republic: Implications for cold subduction"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4929"],["dc.bibliographiccitation.issue","20"],["dc.bibliographiccitation.journal","Geochimica et Cosmochimica Acta"],["dc.bibliographiccitation.lastpage","4947"],["dc.bibliographiccitation.volume","72"],["dc.contributor.author","Svensen, Henrik"],["dc.contributor.author","Bebout, Gray"],["dc.contributor.author","Kronz, Andreas"],["dc.contributor.author","Li, Long"],["dc.contributor.author","Planke, Sverre"],["dc.contributor.author","Chevallier, Luc"],["dc.contributor.author","Jamtveit, Bjorn"],["dc.date.accessioned","2018-11-07T11:10:01Z"],["dc.date.available","2018-11-07T11:10:01Z"],["dc.date.issued","2008"],["dc.description.abstract","We have investigated the N geochemistry of minerals and rocks from contact metamorphic aureoles and hydrothermal vent complexes (HVC) in the Karoo Basin in South Africa. The HVC formed during phreatic eruptions associated with rapid devolatilization and pressure build-up in contact aureoles around early Jurassic sill intrusions. By combining outcrop data from a HVC and core data from contact aureoles, we investigate the relationship between light element release during metamorphism and vertical fluid migration. Sandstone and breccia from the HVC contain early-diagenetic ammonium NH4+-bearing feldspar (buddingtonite) and illite. Ammonium occupies up to 95% of the A site in feldspar, corresponding to concentrations up to 5.2 wt% N. Bulk-rock N isotope data for rocks from inside and outside the hydrothermal vent complex fall into two distinct groups. Background samples have 815 N-air between +1.5 parts per thousand and +4.9 parts per thousand, whereas minerals from the vent complex have 815 N in the range +7.5 to +10.6 parts per thousand. The N geochemistry of contact metamorphic shale from the lower stratigraphic units of the Karoo Basin shows that the vitrinite reflectance and 615 N values are positively correlated. Shale with reflectivity values >4%Ro are enriched in N-15, with delta N-15 values between +6 parts per thousand. and +14 parts per thousand, implying the release of isotopically light N into metamorphic fluids (probably as N-2). We suggest that the relatively high 615 N values of the early-diagenetic buddingtonite in the HVC reflect exchange of buddingtonite with N-bearing fluids ascending from greater depth after their release during contact metamorphism and dehydration. We present a qualitative model whereby hydrothermal vent complexes represent fluid flow structures after their formation, focusing N-bearing metamorphic fluids sourced in deeper levels of the basin. The release of organic N from sediments at depth in volcanic basins could play a role in the geochemical cycle of N, becoming particularly important during periods of intense volcanic activity. (C) 2008 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.gca.2008.07.023"],["dc.identifier.isi","000260038200003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53125"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0016-7037"],["dc.title","Nitrogen geochemistry as a tracer of fluid flow in a hydrothermal vent complex in the Karoo Basin, South Africa"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","457"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Geostandards and Geoanalytical Research"],["dc.bibliographiccitation.lastpage","475"],["dc.bibliographiccitation.volume","40"],["dc.contributor.author","Nasdala, Lutz"],["dc.contributor.author","Corfu, Fernando"],["dc.contributor.author","Valley, John W."],["dc.contributor.author","Spicuzza, Michael J."],["dc.contributor.author","Wu, Fu-Yuan"],["dc.contributor.author","Li, Qiu-Li"],["dc.contributor.author","Yang, Y."],["dc.contributor.author","Fisher, Chris"],["dc.contributor.author","Muenker, Carsten"],["dc.contributor.author","Kennedy, Allen K."],["dc.contributor.author","Reiners, Peter W."],["dc.contributor.author","Kronz, Andreas"],["dc.contributor.author","Wiedenbeck, Michael"],["dc.contributor.author","Wirth, Richard"],["dc.contributor.author","Chanmuang, Chutimun"],["dc.contributor.author","Zeug, Manuela"],["dc.contributor.author","Vaczi, Tamas"],["dc.contributor.author","Norberg, Nicholas"],["dc.contributor.author","Haeger, Tobias"],["dc.contributor.author","Kroener, Alfred"],["dc.contributor.author","Hofmeister, Wolfgang"],["dc.date.accessioned","2018-11-07T10:05:26Z"],["dc.date.available","2018-11-07T10:05:26Z"],["dc.date.issued","2016"],["dc.description.abstract","In this article, we document a detailed analytical characterisation of zircon M127, a homogeneous 12.7 carat gemstone from Ratnapura, Sri Lanka. Zircon M127 has TIMS-determined mean U-Pb radiogenic isotopic ratios of 0.084743 +/- 0.000027 for Pb-206/U-238 and 0.67676 +/- 0.00023 for Pb-207/U-235 (weighted means, 2s uncertainties). Its Pb-206/U-238 age of 524.36 +/- 0.16 Ma (95% confidence uncertainty) is concordant within the uncertainties of decay constants. The delta O-18 value (determined by laser fluorination) is 8.26 +/- 0.06 parts per thousand VSMOW (2s), and the mean Hf-176/Hf-177 ratio (determined by solution ICP-MS) is 0.282396 +/- 0.000004 (2s). The SIMS-determined delta Li-7 value is -0.6 +/- 0.9 parts per thousand (2s), with a mean mass fraction of 1.0 +/- 0.1 mu g g(-1) Li (2s). Zircon M127 contains similar to 923 mu g g(-1) U. The moderate degree of radiation damage corresponds well with the time-integrated self-irradiation dose of 1.82 x 10(18) alpha events per gram. This observation, and the (U-Th)/He age of 426 +/- 7 Ma (2s), which is typical of unheated Sri Lankan zircon, enable us to exclude any thermal treatment. Zircon M127 is proposed as a reference material for the determination of zircon U-Pb ages by means of SIMS in combination with hafnium and stable isotope (oxygen and potentially also lithium) determination."],["dc.identifier.doi","10.1111/ggr.12123"],["dc.identifier.isi","388469700002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38892"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1751-908X"],["dc.relation.issn","1639-4488"],["dc.title","Zircon M127-A Homogeneous Reference Material for SIMS U-Pb Geochronology Combined with Hafnium, Oxygen and, Potentially, Lithium Isotope Analysis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","15"],["dc.bibliographiccitation.journal","Geochimica et Cosmochimica Acta"],["dc.bibliographiccitation.volume","71"],["dc.contributor.author","Nasdala, L."],["dc.contributor.author","Hofmeister, Wolfgang"],["dc.contributor.author","Mattinson, James M."],["dc.contributor.author","Dorr, W."],["dc.contributor.author","Corfu, Fernando"],["dc.contributor.author","Reiners, Peter W."],["dc.contributor.author","Kronz, A."],["dc.contributor.author","Norberg, N."],["dc.contributor.author","Kroner, Antje"],["dc.date.accessioned","2018-11-07T11:00:00Z"],["dc.date.available","2018-11-07T11:00:00Z"],["dc.date.issued","2007"],["dc.format.extent","A705"],["dc.identifier.isi","248789901626"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/50831"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.publisher.place","Oxford"],["dc.relation.conference","17th Annual V M Goldschmidt Conference"],["dc.relation.eventlocation","Cologne, GERMANY"],["dc.relation.issn","0016-7037"],["dc.title","Zircon M257 - A new standard for SHPdMP U-Pb geocbronology"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","22107"],["dc.bibliographiccitation.issue","C9"],["dc.bibliographiccitation.journal","JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS"],["dc.bibliographiccitation.lastpage","22116"],["dc.bibliographiccitation.volume","105"],["dc.contributor.author","Halfar, Jochen"],["dc.contributor.author","Zack, Thomas"],["dc.contributor.author","Kronz, A."],["dc.contributor.author","Zachos, J. C."],["dc.date.accessioned","2018-11-07T10:10:23Z"],["dc.date.available","2018-11-07T10:10:23Z"],["dc.date.issued","2000"],["dc.description.abstract","We investigated rhodoliths (coralline red algae) from a subtropical locality in the Gulf of California (Lithothamnium crassiusculum) and a subarctic locality in Newfoundland (Lithothamnium glaciale) for their potential as paleoenvironmental archives using microanalytical geochemical techniques to measure variations in delta(18)O, Mg, and Ca. Rhodoliths are potentially well suited as recorders of shallow water paleoenvironmental signals because they (1) have worldwide distribution from the tropics to polar regions, (2) are long lived from decades to centuries, and (3) display well-developed growth bands. Our results indicate that rhodolith growth bands preserve ultrahigh-resolution records of paleoceanographic-paleoclimatic change and likely constitute an important new archive for reconstructing the paleoenvironmental history of littoral-neritic areas in which these algae are found. The delta(18)O content of individually sampled rhodolith growth bands ranges from -2.4 to -4.6 parts per thousand in L. crassiusculum and from -3.2 to -0.3 parts per thousand in L, glaciale. In both cases, the range of delta(18)O values suggests a slightly lower amplitude of variation in sea surface temperature than that actually measured in the ocean at the two study sites. Both L, crassiusculum ann L, glaciale show a negative offset from isotopic equilibrium. Electron microprobe analysis of magnesium and calcium in growth bands reveals cyclic variations with values ranging between 7.7-18.5 mol % MgCO3 in L. glaciale and 13.2-22.5 mol % MgCO3 in L. crassiusculum. In addition, electron microprobe element maps highlight individual growth bands, provide a powerful approach to study rhodolith formation, and indicate that the specimens we analyzed have Vertical growth rates of 250-450 mu m/yr."],["dc.identifier.doi","10.1029/1999JC000128"],["dc.identifier.isi","000089369600017"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/39844"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Geophysical Union"],["dc.relation.issn","2169-9291"],["dc.relation.issn","2169-9275"],["dc.title","Growth and high-resolution paleoenvironmental signals of rhodoliths (coralline red algae): A new biogenic archive"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]