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@article{975151, author = {Čopjaková, Renata and Novák, Milan and Franců, Eva}, article_number = {november}, keywords = {Authigenic monazite;Diagenesis;Very-low grade metamorphism;Graywackes;Lower Carboniferous Culm basin;Bohemian Massif}, language = {eng}, issn = {0024-4937}, journal = {Lithos}, title = {Formation of authigenic monazite-(Ce) to monazite-(Nd) from Upper Carboniferous graywackes of the Drahany Upland: Roles of the chemical composition of host rock and burial temperature}, volume = {127}, year = {2011} }
TY - JOUR ID - 975151 AU - Čopjaková, Renata - Novák, Milan - Franců, Eva PY - 2011 TI - Formation of authigenic monazite-(Ce) to monazite-(Nd) from Upper Carboniferous graywackes of the Drahany Upland: Roles of the chemical composition of host rock and burial temperature JF - Lithos VL - 127 IS - november SP - 373-385 EP - 373-385 SN - 00244937 KW - Authigenic monazite;Diagenesis;Very-low grade metamorphism;Graywackes;Lower Carboniferous Culm basin;Bohemian Massif N2 - Irregular aggregates of monazite-(Ce) to monazite-(Nd)have been found in graywackes from the Protivanov Formation, Drahany Upland, Czech Republic. Textural evidences suggest that they are of authigenic origin and grew during very low-grade metamorphism at a maximum temperature ~200–300C in relation to a deep burial. Authigenic monazite appears to form only in Ca-poor rocks. In Ca-rich graywackes, which underwent the same low-temperature metamorphic overprint, authigenic synchysite-(Ce) or parisite-(Ce) are common instead. Authigenic monazite shows low concentrations of Th, U, Ca, Y+HREE, and a low Eu anomaly. Zoning pattern suggests an evolution in fluid chemistry during diagenesis/very low-grade metamorphism or it relates to different solubility of the individual REE-phosphates. The major source of REEs are detrital minerals mainly monazite. Other minor sources of REEs probably include Fe-oxide/hydroxide and/or clay minerals, which could have contributed to the Nd+MREE-rich cores. ER -
ČOPJAKOVÁ, Renata, Milan NOVÁK and Eva FRANCŮ. Formation of authigenic monazite-(Ce) to monazite-(Nd) from Upper Carboniferous graywackes of the Drahany Upland: Roles of the chemical composition of host rock and burial temperature. \textit{Lithos}. 2011, vol.~127, november, p.~373-385. ISSN~0024-4937.
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