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Thermobarometry and tectonic setting of the regional metamorphic rocks from South Sirjan (the Southern SSZ), Iran. | ||
Geopersia | ||
مقاله 5، دوره 14، شماره 1 - شماره پیاپی 22287825، فروردین 2024، صفحه 73-88 اصل مقاله (4.8 M) | ||
نوع مقاله: Research Paper | ||
شناسه دیجیتال (DOI): 10.22059/geope.2023.362105.648723 | ||
نویسندگان | ||
Fatemeh Dehghan nayeri1؛ Mohsen Nasrabady* 1؛ Mahboobeh Jamshidibadr2؛ Akbar Ahmadvand3 | ||
1Department of Geology, Faculty of Science, Imam Khomeini International University, Iran | ||
2Department of Geology, Faculty of Science, Payam-e-Noor University, Iran | ||
3Geochemistry Department, Faculty of Earth Sciences, Kharazmi University, Karaj, Iran | ||
چکیده | ||
There are extensive outcrops of regional metamorphic rocks that consist of marble, calcschist, metapelite, and amphibolite in the south Sirjan (southern Sanandaj-Sirjan zone). Garnet, muscovite, biotite, calcite, quartz, and feldspar are the rock-forming minerals of calcschists. Kyanite, garnet, and staurolite constitute the index minerals of the studied metapelites. Amphibole and plagioclase are the main minerals of the massive and foliated amphibolites. The P-T conditions of the regional metamorphic event in the southern SSZ were constrained using conventional (single-reaction) and multi-equilibrium thermobarometry (THERMOCALC software). The average temperature and pressure gained by THERMOCALC software are 8 kb, 643 ˚C, and 9.6 kb, 645 ˚C for Ky-Grt schist and calcschist samples, respectively. Using revised and recalibrated conventional thermobarometry methods result in temperature from 504 to 664 °C and pressure from 6.57 to 7.88 kb for the investigated Ky-Grt schist. Mineralogical paragenesis and thermobarometry results of the investigated metamorphic rocks are in accordance with a medium P/T- type metamorphic gradient. Presumably, Neotethys subduction beneath the Sanandaj-Sirjan block and resulting crustal thickening event led to such a metamorphic gradient during Eo-cimmerian orogeny. Medium P/T metamorphic rocks of the southern Sanandaj-Sirjan zone and accompanying high P/T metamorphic rocks of the north Hajiabad could be defined as a pair of metamorphic belts that were constructed during Zagros orogeny. | ||
کلیدواژهها | ||
Medium P/T metamorphism؛ Eocimmerian orogeny؛ Southern Sanandaj-Sirjan | ||
مراجع | ||
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