Eynatten, Hilmar von

[["dc.bibliographiccitation.firstpage","1421"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Geological Magazine"],["dc.bibliographiccitation.lastpage","1440"],["dc.bibliographiccitation.volume","158"],["dc.contributor.author","Schönig, Jan"],["dc.contributor.author","von Eynatten, Hilmar"],["dc.contributor.author","Meinhold, Guido"],["dc.contributor.author","Lünsdorf, N. Keno"],["dc.date.accessioned","2021-08-12T07:44:48Z"],["dc.date.available","2021-08-12T07:44:48Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract Detrital coesite-bearing garnet is the final product of a complex geological cycle including coesite entrapment at ultra-high-pressure conditions, exhumation to Earth’s surface, erosion and sedimentary transport. In contrast to the usual enrichment of high-grade metamorphic garnet in medium- to coarse-sand fractions, coesite-bearing grains are often enriched in the very-fine-sand fraction. To understand this imbalance, we analyse the role of source-rock lithology, inclusion size, inclusion frequency and fluid infiltration on the grain-size heterogeneity of coesite-bearing garnet based on a dataset of 2100 inclusion-bearing grains, of which 93 contain coesite, from the Saxonian Erzgebirge, Germany. By combining inclusion assemblages and garnet chemistry, we show that (1) mafic garnet contains a low number of coesite inclusions per grain and is enriched in the coarse fraction, and (2) felsic garnet contains variable amounts of coesite inclusions per grain, whereby coesite-poor grains are enriched in the coarse fraction and coesite-rich grains extensively disintegrated into smaller fragments resulting in an enrichment in the fine fraction. Raman images reveal that: small coesite inclusions of dimension < 9 µm are primarily monomineralic, whereas larger inclusions partially transformed to quartz; and garnet fracturing, fluid infiltration and the coesite-to-quartz transformation is a late process during exhumation taking place at c.  330°C. A model for the disintegration of coesite-bearing garnet enables the heterogeneous grain-size distribution to be explained by inclusion frequency. High abundances of coesite inclusions cause a high degree of fracturing and fracture connections to smaller inclusions, allowing fluid infiltration and the transformation to quartz, which in turn further promotes garnet disintegration."],["dc.identifier.doi","10.1017/S0016756821000017"],["dc.identifier.pii","S0016756821000017"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/88298"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-448"],["dc.relation.eissn","1469-5081"],["dc.relation.issn","0016-7568"],["dc.relation.orgunit","Geowissenschaftliches Zentrum"],["dc.rights","CC BY 4.0"],["dc.title","Life-cycle analysis of coesite-bearing garnet"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Scientific Reports"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Schönig, Jan"],["dc.contributor.author","Meinhold, Guido"],["dc.contributor.author","von Eynatten, Hilmar"],["dc.contributor.author","Lünsdorf, Nils K."],["dc.date.accessioned","2020-12-10T18:10:09Z"],["dc.date.available","2020-12-10T18:10:09Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1038/s41598-018-21262-8"],["dc.identifier.eissn","2045-2322"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15417"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/73864"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.intern","Merged from goescholar"],["dc.relation.orgunit","Fakultät für Geowissenschaften und Geographie"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Tracing ultrahigh-pressure metamorphism at the catchment scale"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]