Geochemical characteristics and origin of lamprophyres from Mian-Bazar area, North of Zahedan, SE Iran

Document Type : Original Article

Authors

University of Sistan and Baluchestan

10.22128/ijcm.2025.2965.0

Abstract

In the Mian-Bazaar area, north of Zahedan, eastern Iran, a large number of calk-alkaline lamprophyre dikes are intruded in the flysch-type rocks of Cretaceous to Upper Eocene. The lamprophyres are of two types: Vogesite (Amp+Afs+Opq+Cpx+Ap±Cal±Ol) and minette (Ph+Cpx+Afs+Ol+Opq+Ap±Amp). Average SiO2, total alkali, MgO, and Mg-number are respectively 49.17, 7.68, 7.20 wt. %, and 63 for vogesites, and 49.94, 5.01, 9.06 wt. %, and 67 for minettes. These rocks are highly enriched in LILEs relative to HFSEs; for instance, the ratios of Rb/Hf and Ba/Nb are 9.97 and 63.59. They are also enriched in LREEs compared to MREEs and HREEs; for example, average of La/Yb, La/Sm and Gd/Yb ratios in these samples are 25.81, 7.11 and 3.01. Based on reverse melting model, the source of these rocks is an enriched, phlogopite peridotite in the garnet stability field. Using non-modal batch melting model, these samples are formed as a result of low degrees of partial melting, about one percent, of a combination of phlogopite lherzolite and garnet lherzolite, respectively with a mixture of about 80% and 20% to 50% and 50%. In the tectonic discrimination diagrams of Zr-Ti, Zr-Zr/Y, Ti/Y-Zr/Y, Nb/Y-Ti/Y the samples are plotted in the field of intra-plate basalts. REE and spider diagram patterns of the samples are similar to those of OIB. Magma emplacement is proposed to be occurred in an extensional setting.

 

Keywords

References

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Iranian Journal of Crystallography and Mineralogy
Volume 33, Issue 4 - Serial Number 100
January 2026
Pages 681-696

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  • Receive Date: 22 February 2025
  • Revise Date: 05 April 2025
  • Accept Date: 14 May 2025

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