Investigation of variations of anisotropy of magnetic susceptibility (AMS) in Zafarghand granitoid pluton (SE Ardestan). (English)

Zafarghand granitoid pluton with approximately 80 Km in the extent with early to middle Miocene age cropped out in 35 Km of SE Ardestan. The pluton composed mainly of gabbro to tonalite and intruded in the Eocene volcanic and volcanosedimentary rocks of Uroumieh-Dokhtar structural zone. For the first time, variations of anisotropy of magnetic susceptibility in Zafarghand granitoid pluton have been investigated by using anisotropy of magnetic susceptibility (AMS) method. Based on obtained data, the measured mean magnetic susceptibility values (Km in µSI) of the different rock groups of Zafarghand pluton are as follows: gabbros (32536), diorites (23768), granodiorites (18436), granites (8068) and tonalites (68). Therefore, the Km values decrease from grabbros and diorites to granodiorites, granites and tonalites. Gabbros and tonalites have the highest and the lowest Km values, respectively. The measured Km values indicate that, the studied granitoid belongs to ferromagnetic type (according to magnetite series and I-type granitoids). [ABSTRACT FROM AUTHOR]

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