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Paper Information

Journal:   GEOSCIENCES   SPRING-SUMMER 2004 , Volume 11 , Number 51-52; Page(s) 18 To 27.
 
Paper: 

LITHOLOGICAL AND MICROSTRUCTURAL STUDY OF SORESAT METAMORPHIC COMPLEX (SOUTHEASTERN OF SHAHIN-DEJ)

 
 
Author(s):  GHASEMI A., POURKERMANI M.
 
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Abstract: 

Field and microscopic studies and geochemical analyses suggest that granitoid rocks may be subdivided into three main groups. The first group of granitoid rocks is S-type syn-tectonic granitic gneiss sheets, the second group is I-type volcanic arc granite and granodiorite and the third group is S-type post-collision alkali-granite.
The rocks of Soresat metamorphic complex are different kinds of schist. Andalusite, staurolite, garnet, sillimanite (fibrolite) are the main metamorphic porphyroblasts in these rocks. The protolith of Soresat metamorphic complex are a sequence including shale, siltstone and graywacke with carbonate, arkosic sandstone and pyroclastic intercalations.
A prominent, regionally penetrative foliation (S2) is distinguished in studied area. S2 is generally parallel to meta-sedimentary bedding plane. Thin section studies reveal two discrete deformational events. The first deformational event (D1) is preserved as straight inclusion trails in Pre -S2 Post – S1 andalusite, staurolite porphyroblasts. The S2 is generated by the second deformational event. The retrograde metamorphic event follows the second deformational event. The proposed P-T-t path shows a clock-wise path for Soresat metamorphic complex (Pmax=3.7Kbar, Tmax=600°C).

 
Keyword(s): DEFORMATIONAL EVENTS, PORPHYROBLAST, TRAIL INCLUSION, P-T-T CURVE, TECTONIC, SETTING OF GRANITE, THERMOMETERY
 
References: 
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