Document Type : Original Research Paper
Authors
1 Faculty of Earthscience, Shahrood University of Technology,Shahrood, Iran
2 Department of Mineralogy-Petrology-Economic Geology, School of Geology, AUTh, GR 54124 Thessaloniki, Greece
Abstract
The lower Jurassic (180 ± 1.5 Ma) Gowd-e-Howz granitoid stock, as a part of the Sanandaj-Sirjan Metamorphic-Magmatic Zone (SSMMZ), SE Iran, intruded in the Upper Paleozoic metamorphic and Triassic igneous-sedimentary rocks. It consists of three main rock units including diorite, granodiorite and granite/alkali feldspar granite, which accompanied by minor amounts of gabbro. The stock is predominantly composed of medium to coarse-grained granular granitoids consisting of clinopyroxene, amphibole, biotite, plagioclase, alkali feldspar and quartz. Clinopyroxenes exhibit calcic compositions, ranging from diopside to augite and salite, while amphiboles are primarily calcic with hornblende as the dominant phase. Feldspar display compositional ranges from orthoclase and oligoclase to labradorite. Mineralogical and geochemical evidence indicates this I-type calc-alkaline granitic magma produced in an active continental margin arc setting with potential for Cu-Au mineralization. Geothermobarometry estimations based on clinopyroxene (T= 800 to 1300°C and P= ~12 to 4.5 kbar), amphiboles (T= 742 to 769°C and P=4.5- 2 kbar) and biotite (T = 589 to 875°C and P= 0.45- 2.27 kbar), offer three different magma chamber levels for magma storaging and plumbing at the lower (~45 Km), middle (~16 Km) and upper (~5 Km) continental crust in an active continental arc setting in the Late Triassic-Early Jurassic in the southern part of the SSMMZ, SE Iran.
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