Bendel, Verena

[["dc.bibliographiccitation.firstpage","142"],["dc.bibliographiccitation.journal","Applied Geochemistry"],["dc.bibliographiccitation.lastpage","149"],["dc.bibliographiccitation.volume","90"],["dc.contributor.author","Bau, Michael"],["dc.contributor.author","Schmidt, Katja"],["dc.contributor.author","Pack, Andreas"],["dc.contributor.author","Bendel, Verena"],["dc.contributor.author","Kraemer, Dennis"],["dc.date.accessioned","2020-11-05T15:10:58Z"],["dc.date.available","2020-11-05T15:10:58Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1016/j.apgeochem.2018.01.008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/68506"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-352.8"],["dc.relation.issn","0883-2927"],["dc.title","The European Shale: An improved data set for normalisation of rare earth element and yttrium concentrations in environmental and biological samples from Europe"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","972"],["dc.bibliographiccitation.issue","217"],["dc.bibliographiccitation.journal","Journal of Glaciology"],["dc.bibliographiccitation.lastpage","980"],["dc.bibliographiccitation.volume","59"],["dc.contributor.author","Bendel, Verena"],["dc.contributor.author","Ueltzhoeffer, Kai J."],["dc.contributor.author","Freitag, Johannes"],["dc.contributor.author","Kipfstuhl, Sepp"],["dc.contributor.author","Kuhs, Werner F."],["dc.contributor.author","Garbe, Christoph S."],["dc.contributor.author","Faria, Sergio H."],["dc.date.accessioned","2018-11-07T09:29:35Z"],["dc.date.available","2018-11-07T09:29:35Z"],["dc.date.issued","2013"],["dc.description.abstract","We investigated the large-scale (10-1000 m) and small-scale (mm-cm) variations in size, number and arrangement of air bubbles in the EPICA Dronning Maud Land (EDML) (Antarctica) ice core, down to the end of the bubble/hydrate transition (BHT) zone. On the large scale, the bubble number density shows a general correlation with the palaeo-temperature proxy, delta O-18, and the dust concentration, which means that in Holocene ice there are fewer bubbles than in glacial ice. Small-scale variations in bubble number and size were identified and compared. Above the BHT zone there exists a strong anticorrelation between bubble number density and mean bubble size. In glacial ice, layers of high number density and small bubble size are linked with layers with high impurity content, identified as cloudy bands. Therefore, we regard impurities as a controlling factor for the formation and distribution of bubbles in glacial ice. The anticorrelation inverts in the middle of the BHT zone. In the lower part of the BHT zone, bubble-free layers exist that are also associated with cloudy bands. The high contrast in bubble number density in glacial ice, induced by the impurities, indicates a much more pronounced layering in glacial firn than in modern firn."],["dc.identifier.doi","10.3189/2013JoG12J245"],["dc.identifier.isi","000325385200015"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31072"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Int Glaciol Soc"],["dc.relation.issn","1727-5652"],["dc.relation.issn","0022-1430"],["dc.title","High-resolution variations in size, number and arrangement of air bubbles in the EPICA DML (Antarctica) ice core"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","339"],["dc.bibliographiccitation.issue","196"],["dc.bibliographiccitation.journal","Journal of Glaciology"],["dc.bibliographiccitation.lastpage","348"],["dc.bibliographiccitation.volume","56"],["dc.contributor.author","Ueltzhoeffer, Kai J."],["dc.contributor.author","Bendel, Verena"],["dc.contributor.author","Freitag, Johannes"],["dc.contributor.author","Kipfstuhl, Sepp"],["dc.contributor.author","Wagenbach, Dietmar"],["dc.contributor.author","Faria, Sergio H."],["dc.contributor.author","Garbe, Christoph S."],["dc.date.accessioned","2018-11-07T08:47:57Z"],["dc.date.available","2018-11-07T08:47:57Z"],["dc.date.issued","2010"],["dc.description.abstract","Air bubbles in ice cores play an essential role in climate research, not only because they contain samples of the palaeoatmosphere, but also because their shape, size and distribution provide information about the past firn structure and the embedding of climate records into deep ice cores. In this context, we present profiles of average bubble size and bubble number for the entire EDML (Antarctica) core and the top 600 m of the EDC (Antarctica) core, and distributions of bubble sizes from selected depths. The data are generated with an image-processing framework which automatically extracts position, orientation, size and shape of an elliptical approximation of each bubble from thick-section micrographs, without user interaction. The presented software framework allows for registration of overlapping photomicrographs to yield accurate locations of bubble-like features. A comparison is made between the bubble parameterizations in the EDML and EDC cores and data published on the Vostok (Antarctica) ice core. The porosity at the firn/ice transition is inferred to lie between 8.62% and 10.48% for the EDC core and between 10.56% and 12.61% for the EDML core."],["dc.identifier.isi","000280258200016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21084"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Int Glaciol Soc"],["dc.relation.issn","0022-1430"],["dc.title","Distribution of air bubbles in the EDML and EDC (Antarctica) ice cores, using a new method of automatic image analysis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1055"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","European Journal of Mineralogy"],["dc.bibliographiccitation.lastpage","1065"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Bendel, Verena"],["dc.contributor.author","Schmidt, Burkhard C."],["dc.date.accessioned","2018-11-07T11:09:24Z"],["dc.date.available","2018-11-07T11:09:24Z"],["dc.date.issued","2008"],["dc.description.abstract","This study reports a calibration of Raman band positions for the determination of the Na/K ratio in disordered alkali feldspars. Crystals along the join sanidine-analbite were synthesised in steps of 10 mol% by ion exchange from a natural sanidine from Volkesfeld and were analysed by electron microprobe. Calibrations were made for the positions of three Raman bands located at 120-142 cm(-1) (band A), 454-461 cm(-1) (band B) and 510-514 cm(-1) (band D) and for the difference between D and A (Delta DA). The calibrations for band A and Delta DA are most Suitable for the determination of composition. They show two linear trends with all intersection at about K/(Na+K) = 0.32, which is probably due to the phase transition between the monoclinic and triclillic crystal structures of sanidine and anorthoclase, respectively. For anorthoclase (K/(Na+K) < 0.32) the Raman shift (RS) of band A is related to composition by K/(Na+K) = 4.5077 - 0.0316 - RS. For sanidine (K/(Na+K) > 0.32) the correlation K/(Na+K) = 7.3675 - 0.0550 - RS was obtained. Both correlations allow the determination of K/(Na+K) with an accuracy of better than +/- 0.04 for the synthetic anorthoclase and sanidine. The application of this calibration to natural samples was tested by analysing a series of alkali feldspars (K/(Na+K) = 0.28 - 0.86) from various volcanic rocks. These data suggest that the calibration call be used to estimate the K/(Na+K) ratio in natural disordered alkali feldspars with an accuracy of better than 0.1. A further improvement can be reached by using Delta DA, for which the correlations K/(Na+K) = - 8.3608 + 0.0228 - Delta DA and K/(Na+K) = -21.5327 + 0.0573 - Delta DA were obtained for anorthoclase and sanidine, respectively. These correlations allow the determination of K/(Na+K) with an accuracy of about +/- 0.03 for the synthetic anorthoclase and sanidine and +/- 0.07 for the natural samples."],["dc.identifier.doi","10.1127/0935-1221/2009/0021-1856"],["dc.identifier.isi","000261987000008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53003"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","E Schweizerbartsche Verlags"],["dc.publisher.place","Stuttgart"],["dc.relation.conference","Short Course on Amphiboles"],["dc.relation.eventlocation","Rome, ITALY"],["dc.relation.issn","0935-1221"],["dc.title","Raman spectroscopic characterisation of disordered alkali feldspars along the join KAlSi3O8-NaAlSi3O8: application to natural sanidine and anorthoclase"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","142"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Meteoritics and Planetary Science"],["dc.bibliographiccitation.lastpage","157"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Patzer, Andrea"],["dc.contributor.author","Hezel, Dominik C."],["dc.contributor.author","Bendel, Verena"],["dc.contributor.author","Pack, Andreas"],["dc.date.accessioned","2018-11-07T09:16:00Z"],["dc.date.available","2018-11-07T09:16:00Z"],["dc.date.issued","2012"],["dc.description.abstract","Reduced CV3 chondrites are relatively pristine rocks and prime candidates for studies exploring processes that predated planet formation. We closely examined the petrographic features and trace elemental composition of different CV3 constituents in the accretionary breccia Leoville. The petrographic results are presented here. Our sample (2.2 cm2) is not brecciated. The main ingredientabout 65 area%is fine- to coarse-grained ferromagnesian type I chondrules. Minor constituents (in order of 2-D abundance) include refractory inclusions, Al-rich chondrules, and very fine-crystalline clasts of moderately volatile composition. Type II chondrules and metal nuggets occur sporadically. The chondrulematrix ratio is approximately 3:1. Medium- and coarse-grained chondrules exhibit porphyritic textures, probably caused by incomplete melting, and frequent, partial or continuous, recrystallized dust rims. The fine-grained population most likely represents randomly sectioned dust rims. The rim material and some of the medium-grained objects are relatively troilite-rich. Iron-nickel metal is rare. In addition, almost all constituents show strikingly ragged or convoluted outlines. Only a few, rim-less components exhibit smooth contours. Evidence for incomplete melting and the formation of recrystallized or igneous rims in carbonaceous chondrites is well established, suggesting that both processes were widespread events. The observed features in Leoville support this conclusion. In addition, our findings indicate that surface abrasion in a turbulent dust-filled regime may have taken place after the consolidation of dust rims. Alternatively, the irregular, convoluted nature of at least the rimmed chondrules may have been inherent to the dust accretion event and was not erased by subsequent heating."],["dc.description.sponsorship","DFG (German Research Foundation) [PA1970/1-1, PA909/2-1, PA909/2-2]"],["dc.identifier.doi","10.1111/j.1945-5100.2011.01318.x"],["dc.identifier.isi","000298743900008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27835"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1086-9379"],["dc.title","Chondritic ingredients: I. Usual suspects and some oddballs in the Leoville CV3 meteorite"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1391"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Meteoritics & Planetary Science"],["dc.bibliographiccitation.lastpage","1412"],["dc.bibliographiccitation.volume","53"],["dc.contributor.author","Patzer, Andrea"],["dc.contributor.author","Hezel, Dominik C."],["dc.contributor.author","Bendel, Verena"],["dc.contributor.author","Pack, Andreas"],["dc.date.accessioned","2020-12-10T18:29:10Z"],["dc.date.available","2020-12-10T18:29:10Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1111/maps.13084"],["dc.identifier.issn","1086-9379"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/76544"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation.issn","1086-9379"],["dc.title","Chondritic ingredients: II. Reconstructing early solar system history via refractory lithophile trace elements in individual objects of the Leoville CV3 chondrite"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Meteoritics and Planetary Science"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Bendel, Verena"],["dc.contributor.author","Pack, Andreas"],["dc.contributor.author","O'Neill, H. St. C."],["dc.contributor.author","Jenner, F. E."],["dc.contributor.author","Muenker, Carsten"],["dc.date.accessioned","2018-11-07T09:08:23Z"],["dc.date.available","2018-11-07T09:08:23Z"],["dc.date.issued","2012"],["dc.format.extent","A63"],["dc.identifier.isi","000307389700030"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26022"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.publisher.place","Hoboken"],["dc.relation.eventlocation","Cairns, AUSTRALIA"],["dc.relation.issn","1086-9379"],["dc.title","Volatility-controlled rare earth element fractionation in the early solar system"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]