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

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. Lithos. 2011, vol. 127, november, p. 373-385. ISSN 0024-4937.

Basic information

• Original name: 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
• Authors: ČOPJAKOVÁ, Renata (203 Czech Republic, guarantor), Milan NOVÁK (203 Czech Republic, belonging to the institution) and Eva FRANCŮ (203 Czech Republic).
• Edition: Lithos, 2011, 0024-4937.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10500 1.5. Earth and related environmental sciences
• Country of publisher: Netherlands
• Confidentiality degree: is not subject to a state or trade secret
• Impact factor: Impact factor: 3.246
• RIV identification code: RIV/00216224:14310/11:00056033
• Organization unit: Faculty of Science
• UT WoS: 000298070600024
• Keywords in English: Authigenic monazite;Diagenesis;Very-low grade metamorphism;Graywackes;Lower Carboniferous Culm basin;Bohemian Massif
• Tags: AKR, rivok

Abstract

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.

Links

• MSM0021622412, plan (intention): Name: Interakce mezi chemickými látkami, prostředím a biologickými systémy a jejich důsledky na globální, regionální a lokální úrovni (INCHEMBIOL) (Acronym: INCHEMBIOL)

Investor: Ministry of Education, Youth and Sports of the CR, Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)