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Mineralogy and Petrology

, Volume 112, Issue 4, pp 501–520 | Cite as

North Qorveh volcanic field, western Iran: eruption styles, petrology and geological setting

  • Abbas Asiabanha
  • Jacques-Marie Bardintzeff
  • Sara Veysi
Original Paper

Abstract

In the metamorphic Sanandaj-Sirjan Zone of western Iran, the “North Qorveh Volcanic Field” is constituted by Pleistocene scoria cones and associated deposits. Most scoria cones in the area display a simple structure resulted by Strombolian eruptions. Some of them are more complex, such as the Kuh-e Qarineh cone in where basaltic scoriaceous falls are underlain by felsic pyroclastic density–current deposits due to gas streaming at the base of eruption columns and are overlain by basaltic lava flows linked to basaltic fire fountains. Thus, it seems that the latter cones have been likely constructed by more or less violent Strombolian and then Hawaiian activities. Two types of enclaves have been found: gneissic xenoliths scavenged from the metamorphic basement and ultramafic–mafic (37–47 wt% SiO2) cumulates with the same paragenesis as the basaltic scoriaceous falls and lava flows. Three classes of cumulates were identified: (1) apatite mica hornblendite; (2) apatite hornblendite; and (3) olivine biotitite. Moreover, the mineral assemblage of basaltic rocks in the area (olivine (Fo79 − 83) + diopside + pargasite + phlogopite + Fe-Ti oxides ± plagioclase ± apatite) is very similar to lamprophyric facies. So, it seems that the parental magma was originated by mantle metasomatism. Although the felsic pyroclastic density–current deposits show a calcalkaline trend, the whole-rock and mineral chemistry of the basaltic rocks in the area imply an alkaline affinity. Also, the samples show subduction and continental collision signatures. Thus, the alkaline composition of this young volcanic centre in a metamorphic terrain could be explained by descending slab-break off and reactivation of small-scale convection at the lithosphere-asthenosphere boundary.

Keywords

Scoria cone Strombolian eruption Enclave Slab break-off Metasomatism Iran 

Notes

Acknowledgements

L. McGee and J. Lindsay are thanked for useful remarks. Careful reviews by B. Bonin, an anonymous reviewer, and journal editor L. Danyushevsky greatly helped to improve this paper.

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Copyright information

© Springer-Verlag GmbH Austria 2017

Authors and Affiliations

  • Abbas Asiabanha
    • 1
  • Jacques-Marie Bardintzeff
    • 2
  • Sara Veysi
    • 1
  1. 1.Department of Geology, Faculty of ScienceImam Khomeini International UniversityQazvinIran
  2. 2.Université Paris-Sud, Sciences de la Terre, Volcanologie, Planétologie, UMR CNRS 12 8148 GEOPS, bât. 504, Université Paris-SaclayOrsayFrance

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