CHITINOZOAN BIOSTRATIGRAPHY AND PALAEOGEOGRAPHY OF SILURIAN STRATA (NIUR FORMATION)AT EASTERN ALBORZ RANGE (KOPET-DAGH REGION) NORTHEASTERN IRAN

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GHAVIDEL SIOUKI M.

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Journal: JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT) Year:2006 | Volume:32 | Issue:3 (SECTION GEOLOGY 2) Page(s): 127-146

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Title

CHITINOZOAN BIOSTRATIGRAPHY AND PALAEOGEOGRAPHY OF SILURIAN STRATA (NIUR FORMATION)AT EASTERN ALBORZ RANGE (KOPET-DAGH REGION) NORTHEASTERN IRAN

Author(s)

GHAVIDEL SIOUKI M. | Issue Writer Certificate

Keywords

CHITINOZOANQ3

EARLY SILURIANQ3

NORTH GONDWANAQ3

EASTERN ALBORZ RANGEQ3

BIOSTRATIGRAPHYQ3

PALAEOGEOGRAPHYQ3

Abstract

The Silurian strata in EASTERN ALBORZ RANGE are called Niur Formation. This formation is well-developed between the Esfarayien and Bojnourd road, approximately 35 km southeastern Bojnourd city (35 km southeastern Caspian Sea). The Niur Formation is 750 thick and in ascending stratigraphic order, it has been divided into Member I and Member n. The Member I is 500 m thick and consists mainly of black shale with subordinate thin-bedded limestone. The Member II is 250 m thick and comprises of white sandstones, changing into red shale towards upward. The lower and uppercontacts of Niur Formation are conformable with underlying Ghelli Formation and overlying Padeha Formation.A total of 76 surface samples were treated for CHITINOZOANs from this formation, in order to establish a CHITINOZOAN biozonation and to determine the palaeogeographic relationships of EASTERN ALBORZ RANGE (Kopet-Dagh Region) to Zagros Basin of southern Iran as well as other parts of the world. All samples of Member I, contain well-preserved and abundantpalynomorphs (acritarchs, CHITINOZOANs, cryptospores and scolecodonts), but those of Member II are barren.Thirty-two CHITINOZOAN species (6 genera) were recognized in this study, and arranged in four biozones Biozone of Ancyrochitinamerga appears in the upper part of Ghelli Formation, suggesting the Ashgillian age. The biozones of Ancyrochitina laevaensis, Ancyrochitina ramosaspina/Angochitina aff. longicollis and Plectochitina saharica occur through Member I of Niur Formation suggesting EARLY SILURIAN for this part of formation. Member II lacks of CHITINOZOANs, but some samples contain cryptospores and a few acritarchs, indicating Wenlockian age. 15 CHITINOZOAN speciesout of 32 are new, including Ancyrochitina angelinae, A. bojnourdensis, A. pelmisensis, A. silurica, A. heterospinosa, A. alborzensis, A. niurensis, A. longifilosa, A. fatema, Angochitina kalatensis, Angochitina minor, Angochitinacaspiensis and Angochitina multipodspina. Except for the new species, the remainder is similar to those of the same age in Zagros Basin southern Iran, Saudi Arabia, Algeria, Libya, Morocco and Spain, suggesting the EASTERN ALBORZ RANGE has been part of NORTH GONDWANA Domain.

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APA: Copy

GHAVIDEL SIOUKI, M.. (2006). CHITINOZOAN BIOSTRATIGRAPHY AND PALAEOGEOGRAPHY OF SILURIAN STRATA (NIUR FORMATION)AT EASTERN ALBORZ RANGE (KOPET-DAGH REGION) NORTHEASTERN IRAN. JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT), 32(3 (SECTION GEOLOGY 2)), 127-146. SID. https://sid.ir/paper/2290/en

Vancouver: Copy

GHAVIDEL SIOUKI M.. CHITINOZOAN BIOSTRATIGRAPHY AND PALAEOGEOGRAPHY OF SILURIAN STRATA (NIUR FORMATION)AT EASTERN ALBORZ RANGE (KOPET-DAGH REGION) NORTHEASTERN IRAN. JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT)[Internet]. 2006;32(3 (SECTION GEOLOGY 2)):127-146. Available from: https://sid.ir/paper/2290/en

IEEE: Copy

M. GHAVIDEL SIOUKI, “CHITINOZOAN BIOSTRATIGRAPHY AND PALAEOGEOGRAPHY OF SILURIAN STRATA (NIUR FORMATION)AT EASTERN ALBORZ RANGE (KOPET-DAGH REGION) NORTHEASTERN IRAN,” JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT), vol. 32, no. 3 (SECTION GEOLOGY 2), pp. 127–146, 2006, [Online]. Available: https://sid.ir/paper/2290/en

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