QE404 : Mineral chemistry and emplacement mechanism of Kuhe-Sookhte subvolcanic intrusion (NW Toroud - South Shahrood) using by anisotropy of magnetic susceptibility method (AMS)
Thesis > Central Library of Shahrood University > Geosciences > MSc > 2018
Authors:
Abstarct: Kuhe- Sookhte sub-volcanic intrusion is part of the Turoud – Chah-Shirin magmatic belt and located in the northern part of Central Iranian structural zone. Volcanic-pyroclastic sequences of Eocene including of volcanic breccia,, agglomerate and red-purple tuff are the host rocks. The studied elliptical - shaped and sub-volcanic intrusion is hornblende porphyritic andsit in composition and calc-alkaline, and cut volcanic-pyroclastic sequences. Plagioclase is the main constituent mineral, hornblende and small amount of biotite, magnetite, apatite are the most important accessory minerals. Different types of alterations including of phyllic and less chloritic are observed at some samples. In order to investigation of the emplacement mechanism of this sub-volcanic intrusion, anisotropy of magnetic susceptibility (AMS) is used. Since the bulk magnetic susceptibility (Km) of all samples is higher than 0/4 SI, the intrusion belongs to ferromagnetic and magnetite series granites. The highest degree of anisotropy (P%) the northern east to west - southwest of the intrusion. Despite the relatively high strain. Highest areas and around the roof of Kuhe- Sookhte intrusion, shaped parameter (T) is oblate and positive. Some stations at the south-western part of andsit intrusion have high-plunge magnetic lineations and prolate shape parameters. This part can consider as feeder zone. The absence of petrographic zonation, concentric pattern through the sub-volcanic intrusion from core to contact with country rocks, oblate fabric at the floor of intrusion, intense crushing and deformation at the country rocks especially at western margins are the main evidences that the pluton emplaced as a balloon. According to the left-slip faults of Anjilo and Toroud and govern tectonics of the region during the emplacement of the studied intrusion, it can be concluded that a dextral shear zone providing tensional spaces required for magma ascend and emplacement at Torud-chahshirin magmatic belt.
Keywords:
#Sub-volcanic intrusion #Kuhe- Sookhte #Mineral chemistry and Anisotropy of magnetic susceptibility (AMS) Link
Keeping place: Central Library of Shahrood University
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Keeping place: Central Library of Shahrood University
Visitor: