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Paper Information

Journal:   GEOSCIENCES   SPRING 2016 , Volume 25 , Number 99; Page(s) 239 To 252.
 
Paper: 

BACK-ARC EXTENSIONAL MAGMATISM IN THE OLIGO-MIOCENE BASIN OF THE NORTHERN EDGE OF CENTRAL IRAN

 
 
Author(s):  GHASEMI H.*, ROSTAMI HOSSURI M., SADEGHIAN M., KADKHODAYE ARAB F.
 
* FACULTY OF EARTH SCIENCES, SHAHROOD UNIVERSITY OF TECHNOLOGY, SHAHROOD, IRAN
 
Abstract: 

Subduction of the Neo-Tethyan oceanic lithosphere beneath the southern edge of the Central Iran caused development of extensional back-arc basins behind the Urumieh-Dokhtar magmatic belt during Mesozoic and Cenozoic. Some researchers have noted formation of the oceanic backarc basins in Nain, Sabzevar and Sistan in Central Iran during Mesozoic, but little is known about generation of such basins in Cenozoic. The depressed extensional back-arc basin of Central Iran contains sedimentary successions of intracontinental extensional environments associated with alkaline basic magmatic rocks. These magmatic rocks are outcropped in the Oligo-Miocene gypsiferous red marls (red formations), as both intrusive (gabbro) and extrusive (basalt) forms. The present study has focused on the basaltic lava flows in the Oligo-Miocene siliciclasticevaporitic sedimentary succession extending for about 300 kilometers from Sabzevar to Shahroud along the northern edge of Central Iran. These lava flows are observed as interbedded with the Oligo-Miocene sedimentary units. In the Kalate-Sadat area, located SW of Sabzevar, there are at least five intermittent basaltic lava flows in the red marls. These basaltic rocks (with a composition of olivine-basalt to basalt) show porphyritic, glomeroporphyritic and trachytic textures and are composed of olivine, clinopyroxene and plagioclase phenocrysts in a glassy to microlitic ground mass. On the basis of geochemical data, the parent magma of these rocks had a sodic-alkaline affinity, enriched in LILEs and LREEs and depleted in HREEs, without negative anomalies in HFSEs. The basalts show the geochemical characteristics of the basaltic magmas originated from partial melting of adjusted enriched garnet lherzolite mantle source beneath the continental areas of extensional back-arc basins.

 
Keyword(s): BASALT, EXTENSIONAL BASIN, BACK-ARC, OLIGO-MIOCENE, CENTRAL IRAN
 
 
References: 
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Click to Cite.
APA: Copy

GHASEMI, H., & ROSTAMI HOSSURI, M., & SADEGHIAN, M., & KADKHODAYE ARAB, F. (2016). BACK-ARC EXTENSIONAL MAGMATISM IN THE OLIGO-MIOCENE BASIN OF THE NORTHERN EDGE OF CENTRAL IRAN. GEOSCIENCES, 25(99), 239-252. https://www.sid.ir/en/journal/ViewPaper.aspx?id=508381



Vancouver: Copy

GHASEMI H., ROSTAMI HOSSURI M., SADEGHIAN M., KADKHODAYE ARAB F.. BACK-ARC EXTENSIONAL MAGMATISM IN THE OLIGO-MIOCENE BASIN OF THE NORTHERN EDGE OF CENTRAL IRAN. GEOSCIENCES. 2016 [cited 2021May14];25(99):239-252. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=508381



IEEE: Copy

GHASEMI, H., ROSTAMI HOSSURI, M., SADEGHIAN, M., KADKHODAYE ARAB, F., 2016. BACK-ARC EXTENSIONAL MAGMATISM IN THE OLIGO-MIOCENE BASIN OF THE NORTHERN EDGE OF CENTRAL IRAN. GEOSCIENCES, [online] 25(99), pp.239-252. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=508381.



 
 
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