Lower Cretaceous carbonate successions outcrop extensively along the northern Tethyan margin in Kopet-Dagh (NE Iran) and Yazd Block (Central Iran). These units are not well constraint terms of stratigraphic, sedimentological, geochemical, paleobiogeographic view point. To improve our knowledge, a detailed multidisciplinary study has been presented on two roughly coeval stratigraphic different a...

In Western Kopet Dagh, the lower Cretaceous carbonate series contains distinctive assemblages of calcareous algae, chiefly Dasycladales which are primarily studied in this work. Based on the significant presence of certain species, the Zard Formation, assigned to the Valanginian and, in its upper part, to the Hauterivian or base of the Barremian, is subdivided into two intervals, respectively A...

The current study deals with microfacies and the depositional environment of Lower Cretaceous Sarmord Formation at selected sections in Sulaimani Erbil Governorates, northern Iraq. alternates rhythmically between yellowish grey marly limestones black marls. These lithologies are observed all studied Petrographic investigation this based on 240 thin demonstrated that carbonate constituents mainl...

Integrated organic petrographic and geochemical analyses were made on organic-rich marine carbonate mixed clastic-carbonate rocks of Middle–Late Jurassic Early Cretaceous age from the Shushan Basin, Egypt to evaluate their hydrocarbon potential. Analyses allowed identification depositional settings, paleoclimate, three third order genetic stratigraphic sequences (SQ) with deposits assigned high...

The stable carbon isotopic compositions of carbonate sediments (?13Ccarb) have been widely used to reconstruct the global cycle and as a stratigraphic correlation tool. This work investigates ?13Ccarb record marine organic-rich, mixed siliciclastic?carbonate mudstones accumulated from Tithonian (late Jurassic) early Valanginian (early Cretaceous) in retro-arc basin connected Proto-Pacific Ocean...