A preliminary study of the anisotropy of magnetic susceptibility (AMS) of Boroujerd granitoids, Sanandaj-Sirjan Zone, West Iran

• 作者: Dariush Esmaeily Jamal Rasouli Vahid Ahadnejad
• 来源期刊: 自然科学期刊(英文)
• 学科: 地球科学
• 关键词: Gousheh Boroujerd Sanandaj-Sirjan Iran AMS GRANITOID NEOTETHYS
• 年，卷（期）: 2012,（2）
• 页码范围: 91-105
• 页数: 15页
• 分类号: P5

摘要

The Boroujerd pluton (ca 175 Ma) was emplaced in the Sanandaj-Sirjan zone (SSZ) active margin of Central Iran consists of monzogranite, granodiorite, and quartz-diorite. Microstructural studies show a continuum from magmatic to (sub) mylonitic deformations fabric. Intensity of deformation decreases from W-NW to E-SE. The over- all magnetic fabric of the pluton yields steep NW- SE striking foliations and sub-horizontal lineations plunging both to the northwest and south- east. These features imply that during intrusion of the pluton, a NW-SE trending stretching was dominant. This stretching is ascribed to the trans- pressive deformation of the overriding SSZ during northeastward subduction of the Neotethys under the Iranian plate. The NW-SE trending lineations of the Gousheh pluton (ca 35 Ma) suggest that the transpressive regime was ongoing from the Mesozoic to late Eocene.