Mid-Cretaceous radiolarian faunas from the Ashin Ophiolite (western Central-East Iranian Microcontinent)

Shirdashtzadeh, Nargess, Kachovich, Sarah, Aitchison, Jonathan C. and Samadi, Ramin (2015) Mid-Cretaceous radiolarian faunas from the Ashin Ophiolite (western Central-East Iranian Microcontinent). Cretaceous Research, 56 110-118. doi:10.1016/j.cretres.2015.04.003


Author Shirdashtzadeh, Nargess
Kachovich, Sarah
Aitchison, Jonathan C.
Samadi, Ramin
Title Mid-Cretaceous radiolarian faunas from the Ashin Ophiolite (western Central-East Iranian Microcontinent)
Journal name Cretaceous Research   Check publisher's open access policy
ISSN 1095-998X
0195-6671
Publication date 2015-09-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.cretres.2015.04.003
Open Access Status
Volume 56
Start page 110
End page 118
Total pages 9
Place of publication London, United Kingdom
Publisher Academic Press
Collection year 2016
Language eng
Abstract The Ashin ophiolitic mélange crops out in the west of the Central-East Iranian Microcontinent (CEIM). Accurate dating the deep-water radiolarian chert deposits associated with this ophiolite provide valuable data to constrain the stratigraphic and paleotectonic evolution this Neo-Tethyan oceanic basin. Chert nodules within Upper Cretaceous limestones and chert layers overlying pillow lavas of this ophiolite were collected and examined in detail for the first time. Radiolarians indicate that the cherts accumulated in the mid-Cretaceous in a deep marine setting within the eastern branch of the Tethyan Ocean in Iran. Two distinct radiolarian faunas, one mid-Albian (∼107 Ma) the other Turonian (∼94 Ma) were recovered. The radiolarian microfossil ages are consistent with radiometric ages previously obtained from associated plagiogranites and quartz keratophyre. This study indicates that mid-Cretaceous radiolarian assemblages from the western CEIM are similar to other radiolarian faunas reported from Cretaceous ophiolites in Greece, Turkey, Iran (Outer Zagros Ophiolitic Belt in Iran, e.g. Khoy, Kermanshah, Neyriz, and Soulabest), and southern Tibet in China.
Keyword Cretaceous
Radiolarian chert
Ashin ophiolitic mélange
Central-East Iranian Microcontinent
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
Official 2016 Collection
 
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