Geochronological and geochemical evidence for multi-stage apatite in the Bafq iron metallogenic belt (Central Iran), with implications for the Chadormalu iron-apatite deposit

Nayebi, Niloofar; Esmaeily, Dariush; Chew, David; Lehmann, Bernd; Modabberi, Soroush

doi:10.1016/j.oregeorev.2021.104054

Cited by 14 publications

(1 citation statement)

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“…However, the data records from the Early Cambrian metasedimentary rocks were in stark contrast with ocean basin formation or rift-drift transition and continental breakup. Ramezani and Tucker (2003) and Nayebi et al (2021Nayebi et al ( , 2023 came up with a hypothesis in contrast to anorogenic-extension-related source and proposed the Posht-e-Badam Block to a normal continental arc setting that was developed along the Proto-Tethyan margin of the Gondwana during the Late Neoproterozoic-Early Cambrian. Several studies favour the continental back-arc rifting, parallel to convergence (Proto-Tethyan) during the Late Neoproterozoic-Early Cambrian (Daliran, 1990;Talbot & Alavi, 1996;Rajabi et al, 2015).…”

Section: Geological Setting and Field Investigationmentioning

confidence: 99%

Zircon U–Pb–Hf and whole‐rock Sr–Nd isotopic insights on the Silurian syenite–monzonite shoshonitic magmatism of Central Iran

Nayebi,

Raeisi,

Babazadeh

et al. 2023

Geological Journal

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The Palaeozoic magmatic history of Central Iran is related to the subduction of the Proto‐Tethys Ocean and the amalgamation of Gondwana continental fragments. This study presents whole‐rock geochemistry, Sr–Nd isotope and zircon U–Pb–Hf ages of shoshonitic plutonic rocks (e.g., monzonite–syenite) from the north Posht‐e‐Badam (NPB) district with a view to constrain their petrogenetic and tectono‐magmatic evolution during the Palaeozoic. The geochemical data show moderate enrichment in large‐ion lithophile elements and Ti, large positive Pb anomalies, and depletion or moderate enrichment in high‐field‐strength elements (e.g., Nb and Ta), typical of continental arcs. Zircon LA–ICP–MS U–Pb ages are in the range of 444–428 Ma. The Sr–Nd–Hf isotope data, for example, (87Sr/86Sr)i = 0.7073 to 0.7089, εNd(t) = −1.4 to −0.2, and εHf(t) = −3.6 to +7.7, indicate derivation of the magma from a mantle source. The numerical modelling shows a contribution of less than 10% crustal assimilation and ~3% sediment into the melt‐derived mantle. We propose that metasomatic enrichment occurred during the subduction of Proto‐Tethyan Ocean between the Iranian microcontinents, leading to the formation of a shoshonitic melt. We infer that the recorded ages coincide with a continental rift episode followed by a rear arc tectonic region that spread along the northern active margin of Gondwana. Further, the change in magma affinity from calc‐alkaline (~474–512 Ma) to shoshonitic (444–428 Ma) in Central Iran is probably related to the gradual steepening of the slab dip angle and trench‐ward migration of the front arc into the region above metasomatically enriched rear arc mantle.

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