Lucci, F., Saki, A., Miri, M., Rabiee, A., White, J.C., 2021, Genesis of trondhjemite by low-pressure fraction anatexis of hornblende-gabbro at Alvand Plutonic Complex (Hamedan, NW Iran): Insights from geochemical modelling. Arabian Journal of Geosciences, v. 14, article 1788, 20 p. (doi: 10.1007/s12517-021-08104-0)
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Physics, Geosciences, and Astronomy
Amphibole-dominated dehydration melting of gabbro is the primary process responsible for the genesis of adakites, low-K tonalites, modern trondhjemites, and plagiogranites aswell as Archean tonalite-trondhjemite-granodiorite suites that represent the earliest examples of continental crust. Previous literature has mostly focused on the role of Al-rich amphibole during anatexis of a mafic source and many of these studies have investigated this process through experimental melting runs. However, due to experimental boundary conditions, little is known about partial melting of amphibole-bearing mafic rock at temperatures < 800°C for upper crustal conditions (pressure < 500 MPa). Classic and forward thermobarometric modelling suggests that in situ trondhjemite leucosomes, hosted by Cheshmeh-Ghasaban mafic metatexites (Alvand Plutonic Complex, Hamedan, NW Iran), represent a rare natural case study of a low-temperature incipient amphibole-dominated anatectic event of a mafic source with a primary assemblage (Pl+Hbl+Cpx+Bt+Opx) typical of a hornblende-bearing gabbroic rock.
Arabian Journal of Geosciences