Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Application of clinopyroxene geothermobarometers on the gabbro/dioritic rocks associated with the Gowd-e-Howz (Siah-Kuh) granitoid stock, Baft, Kerman

Document Type : Original Research Paper

Authors
Mahboubeh Arabzadeh Baniasadi 1
Habibollah Ghasemi 1
Samuel Angiboust 2
Mehdi Rezaei-Kahkhaei 1
Lambrini Papadopoulou 3
1 Department of Geology, Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
2 Earth Sciences Department, Ecole Normale Supérieure de Lyon, Lyon, France
3 Department of Mineralogy-Petrology-Economic Geology, School of Geology, Aristotle University of Thessaloniki (AUTh), Greece
10.22071/gsj.2024.445550.2136
Abstract
The Lower Jurassic (≈180 Ma) granitoid body of the Gowd-e-Howz (Siah-Kuh) is mainly consists of a diorite-granodiorite part (diorite, quartz diorite, monzonite, quartz monzonite and granodiorite), and a smaller granite part (granite. alkali feldspar granite, aplite, and pegmatite), which is associated with an early-intruded small gabbroic part. This intrusion body is located in the south part of the Sanandaj-Sirjan metamorphic belt, southeast of Iran in Dehsard area, baft, Kerman province. This massif as an ellipsoidal granitoid stock has intruded in the Upper Paleozoic metamorphic and Triassic igneous-sedimentary rocks. The Jurassic rock units mainly consist of shale, sandstone and conglomerate, and Lower Cretaceous limestones covered the Triassic sequence and there is no evidence of magma intrusion in them. The overall texture of the granitoid rocks is medium to coarse-grained anhedral granular, but microgranophiric, perthitic, micrographic and myrmekitic textures can also be seen in the granite-alkali granite samples. The main minerals of these rocks include olivine, clinopyroxene, orthopyroxene, amphibole, biotite, and plagioclase, in gabbro/diorites and include amphibole, biotite, plagioclase, alkali feldspar, and quartz in granodiorite-granite samples. Minor and secondary minerals include zircon, apatite, opaque, sphene, and tremolite-actinolite, chlorite, epidote, calcite, sericite, and clays respectively. Clinopyroxene chemistry has been used as the main constituent of gabbro/diorite rocks to investigate the nature of magma, tectonic setting, and physicochemical conditions of crystallization (T, P, fO2) in mafic-intermediate rocks of this body. The clinopyroxenes of these rocks are of calcic diopside-augite-salite type and belong to the I-type calc-alkaline magmatic series of subduction zones. Temperature and pressure estimations based on different single clinopyroxene thermobarometers indicate temperatures of 800 to 1300 ºC at pressures of ≈4 to ≈12 kbar corresponding to pressures equivalent to the depths of 16 to 50 kilometers for the crystallization of this mineral under the medium to high oxygen fugacity in the lower (≈40-50 Km) to middle (≈14-16 Km) continental crust.
Keywords
Geothermobarometry
Clinopyroxene
Granitoid
Gowd-e-Howz
Baft
Kerman

Subjects

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Scientific Quarterly Journal of Geosciences
Volume 34, Issue 3 - Serial Number 133
Autumn 2024, Vol. 34, Issue 3, Serial No. 133
Summer 2024
Pages 117-134