Physicochemical conditions of crystallisation based on the composition of amphibole-Plagioclase pair in the Gowd-e-Howz (Siah-Kuh) granitoid, Baft, Kerman

Document Type : Original Article

Authors

1 Shahrood university of Technology

2 Department of Petrology and Economic Geology- Faculty of Earthsciences- Shahrood University of Technology- Shahrood- Iran

3 3- Associated Professor, Earth Sciences Department, Ecole Normale Supérieure de Lyon, France.

4 Department of Petrology and Economic Geology, Faculty of Earth Sciences, Shahrood University of Technology

5 Earth Sciences Department, Ecole Normale Supérieure de Lyon, France

10.22108/ijp.2024.139533.1311

Abstract

The Lower Jurassic Gowd-e-Howz (Siah Kuh) granitoid Massif (≈180 Ma) is located in the southern part of the Sanandaj-Sirjan metamorphic-magmatic zone in the southeast of Baft, south of Kerman, and is one of the most important magmatic signs of subduction initiation of the Neotethys oceanic basin since the Late Triassic. Although some limited studies have been done about this massif and its cutting dikes (e.g., Malekizadeh, 2000; Ghanbarzadeh, 2011; Arvin et al., 2007), but there isn’t any research about its rock-forming mineral chemistries and their physicochemical conditions of crystallisation, and the article is the first study in this field as a part of the PhD. thesis of the first author.

The tendency to use the composition of clasic amphiboles to understand the processes govern on magmatic systems is due to their widespread presence in a wide range of subduction-related mafic-intermediate-felsic calc-alkaline high-potassium extrusive and intrusive igneous rocks that make them suitable for geothermobarometery. Amphiboles are stable in a wide range of temperature (400 to 1150 °C) and pressure (1 to 23 kbar) conditions (Blundy and Holland, 1990). For this reason, we have used the chemical data of minerals, especially amphiboles and feldspars of different rocks of the Gowd-e-Howz granitoid Massif in different geothermobarometers (e.g., Hammarstrom and Zen, 1986; Hollister et al., 1987; Blundy and Holland, 1990; Holland and Blundy, 1994; Anderson and Smith, 1995; Stein and Dietl, 2001; F´em´enias et al., 2006; Humphreys et al., 2006; Ridolfi et al., 2010, 2011, 2016; Ridolfi and Renzulli, 2012; Molina et al., 2015; Putirka, 2016).

Keywords

Main Subjects



Articles in Press, Accepted Manuscript
Available Online from 07 February 2024
  • Receive Date: 21 October 2023
  • Revise Date: 19 December 2023
  • Accept Date: 07 February 2024