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Information Journal Paper

Title

GEOCHEMISTRY AND EVOLUTION OF THE CONTACT ZONE BETWEEN "TALUN TUNNEL" BASIC INTRUSIVE BODY AND SURROUNDING TUFF ROCKS, CENTRAL ALBORZ

Pages

 Start Page 193 | End Page 206

Abstract

 In this paper, physiochemical characteristics and evoluton of the CONTACT ZONE between "Talun Tunnel intrusive body" and the "country rocks" (surrounding TUFF rocks) in CENTRAL ALBORZ were studied. The intrusive body which is subvolcanic in texture, monzogabbroic in mineralogy and younger than Late Miocene in age, emplaced in Eocene TUFFs of Karaj Formation. The emplacements were occurred as sills and dykes and caused the development of spaced cleavage in the CONTACT ZONE. Based on the physiochemical variations observed from intrusive body towards country rocks, five zones were recognized as follows: I or igneous rock zone, II or contaminated igneous rock zone, III or illite-chlorite zone, IV or altered TUFF (montmorillonite) and V or TUFF. This study shows that hydrothermal solutions derived from the intrusive body, initially inflicted an acidic environment on the country rocks at the CONTACT ZONE. As a result, the country rocks have undergone a decrease in AI, Na, and K, while their Si increased Hydrothermal solutions decreased with time and the alkaline solutions replaced them. Effects of the the alkaline solutions are: the fixation of K and Mg and removal of Ca, the processes which promote the development of illite and chlorite in the country rocks (development of zone III). The alkaline solutions represent a marine environment which existed when zone III was forming.

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