Toselli, A. J. <br/><br/>
Determinación preliminar del Grado Metamórfico en base a la crisitalinidad de illita en algunas localidades del Noroeste de Argentina. 

<br/><br/> Relevamiento: 1981. 
<br/><br/> 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. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Diagenesis<br/>Metamorfismo<br/>Sedimentología
<br/><br/><label>Subjects--Geographic Terms: </label><br/>NOA
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Artículo