A NEW ASPECT ON THE NEYZAR FORMATION BASED ON NEW FINDINGS OF FOSSILS

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VAHIDINIA M.; SADEGHI ABAS; SHEMIRANI A.; ARIAEI A.A.; ADAABI M.H.

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Journal: GEOSCIENCES Year:2007 | Volume:17 | Issue:65 Page(s): 144-169

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Title

A NEW ASPECT ON THE NEYZAR FORMATION BASED ON NEW FINDINGS OF FOSSILS

Author(s)

Keywords

KOPET-DAGHQ2

MAASTRICHTIANQ2

NEYZAR FORMATIONQ3

PALEOSOILQ3

CARBONATE RAMPQ3

GLOBOTRUNCANIDAEQ3

BENTHONICQ2

PLANKTONQ3

Abstract

The Kopet Dagh basin was formed during and after the collision of Turan plate with Iran plate before late Carnian (about 225 m.y. ago). It is located in the northeast of Iran and has a WNW to ESE trend. NEYZAR FORMATION is composed of siliciclastic sediments and sandy shale and sandy limestone. This unit is widespread in the east and northeast parts of the basin. To determine the stratigraphy, microfossils, microfacies and depositional environment of NEYZAR FORMATION, three stratigraphic sections were selected and measurement and detailed sampling carried out on each of them. These sections from east to west are as fallows:1) Tang-e Neyzar (Neyzar gorge) section 2) Tang-e Chahchaheh section3) Jalil abad sectionIn the previous studies, the base and top boundaries of NEYZAR FORMATION with Abtalkh and Kalat Formations were reported conformable and transitional (Afshar Harb, 1373). However, according to present investigations in eastern regions, lower boundary of NEYZAR FORMATION with Abtalkh Formation in sections 1 and 2 are disconformable (as a Paleosol). This boundary in the section 3 is conformable and transitional. The upper boundary of NEYZAR FORMATION with Kalat Formation in 1, 2 and 3 sections are disconformable (as a PALEOSOIL).Two types of facies were identified based on micropaleontologic and petrographic studies: 1) Siliciclastic facies, 2) Carbonate facies. Based on microfacies studies it seems that the siliciclastic parts of NEYZAR FORMATION was deposited in a lagoonal-barrier island environments and the carbonaceous parts in a shallow carbonate platform (ramp type).In most of the published reports and articles NEYZAR FORMATION was introduced as low fossil bearing unit with no index–fossil. The age of this formation was determined only by the basis of its stratigraphical situation, but in the present investigation, in addition, 41 genera and 30 species of microfossils have been identified for the first time from index fossils such as:Orbitoides apiculata, Orbitoides tissoti, Lepidorbitoides sp., Siderolites calcitrapoides, Pseudosiderolites vidali, Abathomphalus mayaroensis.These fossil assemblages suggest the MAASTRICHTIAN, especially Late MAASTRICHTIAN age for NEYZAR FORMATION.

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APA: Copy

VAHIDINIA, M., SADEGHI, ABAS, SHEMIRANI, A., ARIAEI, A.A., & ADAABI, M.H.. (2007). A NEW ASPECT ON THE NEYZAR FORMATION BASED ON NEW FINDINGS OF FOSSILS. GEOSCIENCES, 17(65), 144-169. SID. https://sid.ir/paper/31619/en

Vancouver: Copy

VAHIDINIA M., SADEGHI ABAS, SHEMIRANI A., ARIAEI A.A., ADAABI M.H.. A NEW ASPECT ON THE NEYZAR FORMATION BASED ON NEW FINDINGS OF FOSSILS. GEOSCIENCES[Internet]. 2007;17(65):144-169. Available from: https://sid.ir/paper/31619/en

IEEE: Copy

M. VAHIDINIA, ABAS SADEGHI, A. SHEMIRANI, A.A. ARIAEI, and M.H. ADAABI, “A NEW ASPECT ON THE NEYZAR FORMATION BASED ON NEW FINDINGS OF FOSSILS,” GEOSCIENCES, vol. 17, no. 65, pp. 144–169, 2007, [Online]. Available: https://sid.ir/paper/31619/en

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