Microstructure of minerals investigation and the emplacement pattern of Garagheh granitoid pluton using Anisotropy of Magnetic Susceptibility (AMS)

Document Type : Original Article

Authors

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

2 Institute of Geology, Chinese Academy of Geological Sciences No. 26 Baiwanzhuang Road, Xicheng District, Beijing100037, PR China

3 Department of Geosciences, University of Oslo, PB1047 Blindern, N-0316 Oslo, Norway

Abstract

The granitoid pluton is located about 90 km northwest of Zahedan, in the highest part of the Zahedan-Saravan magmatic belt. Compositionally, the pluton is biotite granite and granodiorite. The rocks forming the northern and southern parts of the pluton have magmatic to sub-magmatic fabric. In addition, our study show low to high temperatures solid-state deformation, such as bulging and chessboard in quartz, myrmikite texture and sliding in biotite. 519 directional cores from 70 stations were collected from the studied area for anisotropy of magnetic susceptibility studies. The mean susceptibility (Km) is from 10-301 µSI. Biotite is the main mineral for magnetic susceptibility in the pluton; where the percentage varies in different parts of the pluton. The P values vary from 0.8-15.5 percent. The T values in most samples are positive and show planner nature. The high degree of dipping of magnetic foliation and lineation, magnetic foliation throughout the pluton are on average from 31 and 60 degrees and shows the northwest-southeast trend. The parallel extension of the lineation with the margin of the pluton and the presence of nearby metamorphic rocks show that during the injection of magma, biotite granite and granodiorite were emplaced parallel to the schistosity of the host rock. In the pluton, the area has magnetic lineation, where a high dip is the main place of magma injection, which is located in the center of the pluton, and other parts can be sub-sites of feeding the pluton. Based on the field observations and magnetic evidence, the parent magmas of the Garagheh granitoid pluton are emplaced as a laccolith with a dip of 45 degrees in the northeast.

Keywords

References

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Iranian Journal of Crystallography and Mineralogy
Volume 32, Issue 3 - Serial Number 95
October 2024
Pages 395-408

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History

  • Receive Date: 20 December 2023
  • Revise Date: 09 January 2024
  • Accept Date: 22 January 2024

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