Burial diagenesis and deformational metamorphism, something more than temperature and stress.

FERNANDO NIETO,; DO CAMPO, MARGARITA; ABAD, ISABEL; HONGN, F.; DEL PAPA, C.; GUTIÉRREZ-ALONSO, G.; MURPHY, BRENDAN

Antalya

Congreso; European Clay Conference; 2011

TURKISH NATIONAL COMMITTEE on CLAY SCIENCE

The evolulion from clays lo shales lOO slales is eharacterized by mineral reactions from smectite 10 illite and ehlorite through mixed.layers with a progressive inerease of crystallinity of ncoformed minerals. In the fin t steps minera1 changes fol1ow a paltcm dependent on depth : slrain related with very-Iow grade melamorphism (VLGM) begins 10 play progressively a significantrole. In spite of the plethora of sequences describe<!, a simple model 10 relate the mineral patlem with burial lempcrature, has failed 10 be established, even eonsidering slmin, suggesting Ihal a comprehensh-e model of mineral reactions should consider <xher variables, such as Ihe role of fluids. We present examples from Canada and Argentina, studied by X ray diffl1lClion, seanning and transmission electroo microscopy, in which Ihe effect of nuids mobilized by regional faultscould be c1carly established in diagenetic I VLGM materials