What does this research mean for the field?

Eocene volcanic rocks in the Posht-e-Badam block of Central Iran are high-K calc-alkaline to shoshonitic magmatic rocks derived from the partial melting of a metasomatized mantle wedge, linked to the subduction of the Neo-Tethyan oceanic crust. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To characterize the petrology, geochemistry, and petrogenesis of Eocene volcanic rocks from the Posht-e-Badam block in Central Iran to understand their tectonic origin.

August 22, 2026Geotectonics

High-K Calc-Alkaline to Shoshonitic Eocene Volcanic Rocks from the Central Iran (Posht-e-Badam Block, Yazd Province)

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Authors

JMJ. MeshmayiUniversity of Isfahan GTGh. TorabiUniversity of Isfahan ZGZ. GharehchahiUniversity of Isfahan

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Implication

Petrological analysis uncovers high-potassium calc-alkaline to shoshonitic volcanism in Central Iran, suggesting a metasomatized mantle wedge source linked to Neo-Tethyan subduction.

Key Points

To characterize the petrology, geochemistry, and petrogenesis of Eocene volcanic rocks from the Posht-e-Badam block in Central Iran to understand their tectonic origin.
Petrographic analysis of mineral assemblages and textural features in volcanic rocks from Saghand, Allahabad, and Chapedony areas in Yazd province.
Whole-rock geochemical analysis measuring major, trace, and rare earth element (REE) compositions, normalized against chondrite and primitive mantle values.
Volcanic rocks range from basic to acidic (SiO2 = 48.9 to 63.4 wt %) with predominant trachyandesite composition, high total alkalis up to 8.74 wt %, and K2O averaging 3.57 wt % (2.32 to 5.42 wt %).
Geochemical signatures display high-K calc-alkaline to shoshonitic affinities, enriched LREE relative to HREE (La/Lu = 77 to 707), LILE enrichment (Cs, K, Rb, Sr, Ba), and HFSE depletion (Ta, Nb, Ti).
Magma petrogenesis indicates origin from low-degree partial melting of a metasomatized spinel lherzolite mantle wedge triggered by Neo-Tethyan oceanic subduction.

Cite This Study

Meshmayi et al. (2026) studied this question.

synapsesocial.com/papers/6a895fd3ca7ade938187eb3a https://doi.org/10.1134/s0016852126700202

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Implication

Petrological analysis uncovers high-potassium calc-alkaline to shoshonitic volcanism in Central Iran, suggesting a metasomatized mantle wedge source linked to Neo-Tethyan subduction.

High-K Calc-Alkaline to Shoshonitic Eocene Volcanic Rocks from the Central Iran (Posht-e-Badam Block, Yazd Province)

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Key Points

Cite This Study

High-K Calc-Alkaline to Shoshonitic Eocene Volcanic Rocks from the Central Iran (Posht-e-Badam Block, Yazd Province)

Discussion

Member takes

Implication

Key Points

Cite This Study

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