Adakite signatures in granitoids northwest of Shahr-e-Babak, Kerman, Iran: constraints from geochemistry

Ghadami, Gholamreza; Nazarinia, Asma

doi:10.1127/njma/2021/0312

Cited by 2 publications

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“…The cones intruded into a variety of rocks of Mesozoic to early Miocene age (Ghadami et al, 2008). Ghadami and Nazarinia (2021) studied some granitoids in the northwest of Shahr-e-Babak and suggested they were adakitic (Kuh-Panj type) and that they formed by partial melting of a thickened, garnet-bearing, amphibolitic lower continental crust. Here, we report for the first time the occurrence of HSA in the UDMA, northwest of the Dehaj-Sardouyeh magmatic belt.…”

Section: Introductionmentioning

confidence: 99%

Petrogenesis of the late Miocene Chenar volcanism in the southeast Urumieh-Dokhtar magmatic belt, Kerman, Iran: evidence from geochemical, U-Pb geochronologic, and Hf isotopic constraints

Salehi,

Shahosinie

2024

GeA

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The Chenar volcanic cone intruded the southeastern part of the Dehaj-Sarduiyeh volcano-sedimentary belt, in the southeast Urumieh-Dokhtar magmatic arc in Iran. The adakitic rocks, with porphyritic texture, mainly consist of rhyodacites and dacites,commonly comprised of phenocrysts of plagioclase, hornblende and biotite, with rare K-feldspar in a groundmass composed of plagioclase, K-feldspar and quartz. They yielded U-Pb zircon ages of 5.52±0.099Ma, 5.46±0.12Ma, and 6.44±0.12Ma, and radiogenic ɛHf(t) values ranging from +3.1 to +12.7. The whole-rock geochemical analysis of these rocks reveals transitional calc-alkaline to shoshonitic characteristics. The geochemical characteristics of the study rocks, particularly their high Sr/Y (⁓51.6-136.8) at low Y (⁓4.43–16.2ppm) and high La/Yb (⁓28.4–118.4ppm) at low Yb (⁓0.2–1.3ppm), are coherent with a high silica adakitic signature. The whole-rock positive Eu/Eu* anomaly and zircon Ce/Ce* anomaly reflect the effects of an oxidized magmatic signature where the rocks of the study area originated from a mantle source. The high silica adakite geochemical characteristics of the Chenar volcanic cone support formation by partial melting of the modified mantle under the influence of metasomatized subducted oceanic slab in a post-collisional environment.

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Section: Introductionmentioning

confidence: 99%