In situ growth of monazite in anchizonal to epizonal mudrocks: first record from the Variscan accretionary prism of the Kaczawa Mountains, West Sudetes, SW Poland

• Autorzy: Kryza R. , Zalasiewicz J. A. , Charnley N. , Milodowski A. E. , Kostylew J. , Tyszka R.
• Języki publikacji: EN

Abstrakty

EN

We report the first occurrence of diagenetic or low grade metamorphic monazite from the Palaeozoic mudrock successions of the Kaczawa Complex of the West Sudetes, Poland. Where observed in relation to the enclosing mudrock, this monazite comprises tiny irregular grains, less than 20 microns in diameter, intergrown with the surrounding matrix minerals. This monazite resembles previously described examples of diagenetic monazite from elsewhere in the world in mostly possessing low contents of Th and U but differs in forming much smaller grains, which show only slight zonation of rare earth elements (REEs). Some of the monazite grains studied also appear to have formed synchronously with the cleavage, perhaps a function of early deformation and fluid release in an accretionary prism environment. Relatively Th-rich cores, and an association with altered detrital biotite in some instances, suggests that at least some of the in situ monazite growth might have taken place as overgrowths on primary detrital monazite particles.

Słowa kluczowe

EN

monazite; mudstone; melange; diagenesi; cleavage formation; low-grade metamorphism; Kaczawa Complex; Sudetes

• Wydawca: Instytut Nauk Geologicznych PAN ; Instytut Nauk Geologicznych Uniwersytetu Wrocławskiego
• Czasopismo: Geologia Sudetica
• Rocznik: 2004
• Tom: Vol. 36
• Strony: 39--51
• Opis fizyczny: Bibliogr. 24 poz.

Twórcy

autor

Kryza R.

• Institute of Geological Sciences, University of Wrocław, Cybulskiego 30, 50-205 Wrocław, Poland

autor

Zalasiewicz J. A.

• Department of Geology, University of Leicester, University Road, Leicester, LE1 7RH, UK

autor

Charnley N.

• Department of Earth Sciences, University of Oxford, Park Roads, Oxford, OX1 3PR, UK

autor

Milodowski A. E.

• British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham, NG12 5GG, UK

autor

Kostylew J.

• Institute of Geological Sciences, University of Wrocław, Cybulskiego 30, 50-205 Wrocław, Poland

autor

Tyszka R.

• Institute of Geological Sciences, University of Wrocław, Cybulskiego 30, 50-205 Wrocław, Poland

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