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Ahmadi A, Biabangard H. Geothermobaromertry of minettes from Kouleh sangi area, north of Zahedan, southeast Iran. www.ijcm.ir 2024; 32 (3) :537-550
URL: http://ijcm.ir/article-1-1922-en.html
URL: http://ijcm.ir/article-1-1922-en.html
1- Department of Geology, University of Sistan and Baluchestan, Zahedan, Iran
Abstract: (113 Views)
To determine the equilibrium temperatures and pressures of intrusive and hypabbyssal minettes from north of Zahedan (NZM), eastern Iran, three geothermometers and one geobarometer have been deployed. These are phlogopite/liquid TiO2 exchange geothermometer, phlogopite-apatite F-OH exchange geothermometer, olivine-spinel Cr-Al-Fe3+ exchange geothermometer, and phlogopite geobarometer. The calculated temperatures show reasonable consistency for the three geothermometers. Average temperatures for NZM rocks are: 1106 °C (SD = 25), 1078 °C (SD = 31) and 1069 °C (SD = 77) for the three geothermometers, respectively. The calculated pressures are in the range 7.3 to 10.3 kbar (mean = 8.7; SD = 0.9), corresponding to depths of 23 to 30 km, well within the lithospheric mantle. Phlogopite is the most abundant mineral and a near-liquidus phase in these rocks, the original P-T calibration has been done on a Mexican lamprophyre similar to NZMs and calculated temperatures show a narrow range with small standard deviations. Therefore, the average pressure (8.7 kbar) and temperature (1106 ⁰C) obtained from phlogopite/liquid geothermobarometry are suggested for these rocks.
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