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- sierradetecka @fieldwork:sierradetecka #Argentina #Jurassic #Paleozoic #Patagonia #Sierra de Tecka #fieldwork #laccolith #mapping
- ltered biotite, muscovite and chlorite as well as accessory opaque minerals. Elongated particles are prefe... thic fragments (10%) of probably volcanic origin. Accessory minerals are mica (mainly biotite and chlorite... minor component and make up approximately 5-10%. Accessory minerals are biotite and opaque phases. Banded