Simon, Klaus

[["dc.bibliographiccitation.artnumber","25"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Contributions to Mineralogy and Petrology"],["dc.bibliographiccitation.volume","174"],["dc.contributor.author","Birski, Łukasz"],["dc.contributor.author","Słaby, E."],["dc.contributor.author","Wirth, R."],["dc.contributor.author","Koch-Müller, M."],["dc.contributor.author","Simon, K."],["dc.contributor.author","Wudarska, A."],["dc.contributor.author","Götze, J."],["dc.contributor.author","Lepland, A."],["dc.contributor.author","Hofmann, A."],["dc.contributor.author","Kuras, A."],["dc.date.accessioned","2019-07-09T11:50:36Z"],["dc.date.available","2019-07-09T11:50:36Z"],["dc.date.issued","2019"],["dc.description.abstract","Multiple tools have been used to determine the sensitivity of phosphates from the early Archaean Barberton greenstone belt to transformation. The assessment of the degree of transformation is crucial for verifying data about the parameters of the paleo-environment. From the obtained results, three generations of phosphates can be distinguished. Group A is observed in cherts and banded iron formation BIF early-generation fluor-hydroxyapatite that precipitated from seawater. It is characterized by flat rare earth element (REE) patterns with a positive Eu anomaly and high Y/Ho ratio in the range of 54–70. Apatites in this group lack any visible indicators of secondary alterations at the micro- and nanoscales. Fourier transform infrared spectra indicate that these apatites are relatively rich in water, and, due to cationic substitution, their OH-stretching regions exhibit complex ordering and numerous component bands. The characteristics observed in the cherts and silicified felsic volcaniclastics of group B imply advanced metasomatic alteration. They exhibit light and heavy REE depletion and an absence of water in the halogen site. Nanoscale investigations reveal cracks, pores, nanofluid inclusions and nanochannellike structures, as well as inclusions. Group C is represented by igneous-derived apatites that partially reflect their igneous origin. The phosphates are predominantly fluorapatite with typical magmatic apatite REE distribution patterns. Imaging at the micro- and nanoscales indicates that they partially preserve the signature of igneous origin. It seems that some of the analyzed apatite partially preserved their primordial features; therefore, they might be used for the reconstruction of Archaean abiotic systems."],["dc.identifier.doi","10.1007/s00410-019-1560-z"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15975"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59806"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","1432-0967"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject.ddc","550"],["dc.title","Archaean phosphates: a case study of transformation processes in apatite from the Barberton greenstone belt"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","44"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Heritage Science"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Germinario, Luigi"],["dc.contributor.author","Siegesmund, Siegfried"],["dc.contributor.author","Maritan, Lara"],["dc.contributor.author","Simon, Klaus"],["dc.contributor.author","Mazzoli, Claudio"],["dc.date.accessioned","2019-07-09T11:44:45Z"],["dc.date.available","2019-07-09T11:44:45Z"],["dc.date.issued","2017"],["dc.description.abstract","Decay of trachyte used as building stone in urban environment was investigated through the analysis of crusts and patinas found on trachyte of the Euganean Hills in the Renaissance city walls of Padua, northeastern Italy. Mineralogical and microstructural characteristics of the alteration products, as well as major- and trace-element chemical composition, were determined by optical microscopy, SEM–EDS and X-ray mapping, XRPD, and LA-ICPMS. The results are discussed referring to environmental parameters, in particular concerning air quality and anthropic pollution sources. The influence of composition of the stone and other neighboring materials on specific weathering processes is also debated. The formation of crusts and patinas turns out to be mainly due to exogenous processes. Enrichment in heavy metals and carbonaceous matter derives from the deposition of particulate emitted during fuel combustion by road vehicles, domestic heating and, secondarily, industrial activities. The particulate is typically cemented by calcite, mainly mobilized after dissolution from nearby mortar joints, or iron, released by leaching from iron-bearing minerals, reprecipitated according to pH fluctuations. Gypsum layers were rarely observed. Generally, composition of the weathering crusts and patinas of Euganean trachyte proves to be an informative marker for the relevant environmental conditions and their evolution."],["dc.identifier.doi","10.1186/s40494-017-0156-z"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15182"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59086"],["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-1/14888 but duplicate"],["dc.relation.issn","2050-7445"],["dc.relation.orgunit","Abteilung Strukturgeologie und Geodynamik"],["dc.rights","CC BY 4.0"],["dc.rights.holder","The Author(s)"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.subject.ddc","550"],["dc.title","Trachyte weathering in the urban built environment related to air quality"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]