US EPA

3585995 

Journal Article 

Layer silicates from a rodingite and its blackwall from Przemilow (Lower Silesia, Poland): mineralogical record of metasomatic processes during serpentinization and serpentinite recrystallization 

Dubinska, E; Wiewiora, A 

1999 

1 

Mineralogy and Petrology
ISSN: 0930-0708 

67 

3-4 

223-237 

WOS:000084637700006 

Minute inclusions of phlogopite and a chlorite-vermiculite intergrade mineral occur in the vesuvianite from rodingite at Przemilow (Lower Silesia). The same inclusions were found in its blackwall, i.e. outer metasomatic zone formed at the expense of adjacent ultrabasic rock. These findings demonstrate that:potassium was released from the rodingite protolith during the Ca-metasomatism that accompanied low-temperature serpentinization and was consumed by phlogopite formed in the rodingite blackwall. Fresh phlogopite persists as small inclusions in vesuvianite. The abundant phlogopite-derived intergrade chlorite-vermiculite in the blackwall documents the potassium-rich composition of the protolith of the rodingite, though its primary chemistry is highly modified during metasomatic processes. The rodingite blackwall can be useful as tracer of the metamorphic and tectonic episodes obscured during complex geological evolution of the ophiolite.