Emplacement of cretaceous radiolarites in Neo-Tethyan sistan ocean, eastern Iran

Category Tectonic & Seismotectonic
Group GSI.IR
Location International Geological Congress,oslo 2008
Author Babazadeh, Seyed Ahmad
Holding Date 10 September 2008

Sedimentary - igneous relation, together with radiolarian biochronology of east Iranian ophiolitic suite is examined. Two ophiolitic branches (Soulabest & Birjand ophiolites) were occurred in northern part of Sistan ocean. This paper focus to explain the age of emplacement and stratigraphy of radiolarites based on field and laboratory works.
The Soulabest ophiolite consists of volcanic rocks, deep marine calcareous rocks and radiolarian chert bearing Thanarla pulchra, Xitus mclaughlini etc. (Babazadeh & De Wever, 2004) was emplaced by ante-Maastrichtian conglomerate. The Birjand ophiolite consists of pillow lava, basalt layer, tuff and radiolarites containing Thanarla veneta, Thanarla conica etc. (Babazadeh, 2007) was covered by Early Eocene conglomeratic layers. The radiolarian fauna in two ophiolitic branches represents the same origin. No Jurassic magmatic basement has been identified on the Sistan ocean.
Key words: Cretaceous radiolarites, Sistan ocean. Eastern Iran.