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Middle Jurassic palynomorphs of the dalichai formation, central Alborz Ranges, northeastern Iran:Paleoecological inferences

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Science China Earth Sciences 2013年第12期56卷 2107-2115页

作者： DEHBOZORGI Afsaneh SAJJADI Freshteh HASHEMI Hossein Faculty of Geology College of ScienceUniversity of TehranEnghelab AvenueTehran 14155-6455Iran Department of Geology Faculty of Science and Research School of Applied SciencesKharazmi UniversityNo. 49Mofatteh AvenueTehran 15614Iran

Palynological data are used to draw paleoecological inferences for the dalichai formation,northeast of Semnan,northeastern *** samples examined yield well-preserved,diverse palynofloras consisting predominantly of miospores;dinoflagellate cysts,foraminiferal test linings,and fungal spores occur as minor ***-four species of spores(37 genera),18species of pollen(9 genera),and 16 species of dinoflagellate cysts(13 genera)are ***-occurrence of such miospore species with known vertical ranges as Klukisporites variegatus,Sellaspora asperata,Murospora florida,and Concavissimisporites verrucosus suggests a Middle Jurassic(Bajocian-Callovian)age for the host strata,thus corroborating the available paleozoological *** spore species as Klukisporites,Cyathidites,and Dictyophyllidites known to have been produced by Pterophyta dominate the *** the contemporaneous coastal vegetation was characterized by predominance of Pterophyta whereas representatives of Ginkgophyta,Pteridospermophyta,Lycophyta,Coniferophyta,and Bryophyta were rarely *** reconstruction implies that a moist,warm climate prevailed in northeastern Iran during the Middle Jurassic(Bajocian-Callovian).This is confirmed by occurrence of fungal spores accompanied by such warm water dinoflagellate cysts as Mendicodinium groenlandicum,Pareodinia ceratophora,and Gonyaulacysta *** of Amorphous Organic Matter(AOM)signifies a shallow,low-energy,dysoxic-anoxic depositional site for the host ***,the ratio of AOM to marine palynomorphs as well as abundance of blade-shaped to eqiudimensional opaque palynomacerals could indicate low sedimentation rate in a shallow,low-oxygenated marine ***,occurrence of chorate dinoflagellate cysts(e.g.,Adnatosphaeridium caulleryi)and acritarchs bearing relatively long processes(e.g.,Micrhystridium)possibly suggests deepening upward in the study section.

关键词： palynomorphs Middle Jurassic paleoecology Alborz Ranges dalichai formation

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