01590caa a22002654a 4500 40374 AR-SsjUBGM 20251220110811.0 251215nuuuuuuuuag 000 0 spa d AR-SsjUBGM AR-SsjUBGM spa ag Toselli, A. J. 43474 Determinación preliminar del Grado Metamórfico en base a la crisitalinidad de illita en algunas localidades del Noroeste de Argentina. Relevamiento: 1981. Illite crystallinity is the criteria used to assess the degree of metamorphism of paleozoic pelitic rocks from Negro Peinado and Volcáncito formations from the Famatina; Puncoviscana formation from Cordillera Oriental; Falda Cienega formation from Puna and Suncho formation from Sierras Pampeanas. -The metamorphism correspond to the anchizone (anchimetamorphismor very low grade metamorphism). -The cristallinity of illite has been determined in sedimentation samples of different grain size (2u; 2-6, 3u and 6,3u).-The peak with at halt heght (Hb) of the (001) reflection serves as a measure of cristallinity and the value of relative Halbwertsbreite (Hbrel) by the fraction 2u defined the level for the metamorphism. An external quartz standard has been used. Diagenesis Metamorfismo Sedimentología NOA 39835 Artículo 24605 Revista del Instituto de Ciencias Geológicas no.4,. p.19-26 0326-9817 AR cdu BIDGYM (ESC) 1993-11-15 40374 40374 0 0 cdu 0 0 GM GM 2025-12-20 0 C-119 2025-12-20 00:00:00 2025-12-20 AR