Petrology and tectonomagmatic setting of volcanic and subvolcanic rocks in the east of Khousf (Southwest of Birjand)

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Yousefzadeh Mohammad Hossein; Rahmani Asiyeh; MOHAMMADI SEYED SAEID

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Journal: PETROLOGY Year:2019 | Volume:10 | Issue:37 Page(s): 1-22

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Information Journal Paper

Title

Petrology and tectonomagmatic setting of volcanic and subvolcanic rocks in the east of Khousf (Southwest of Birjand)

Author(s)

Yousefzadeh Mohammad Hossein | Rahmani Asiyeh | MOHAMMADI SEYED SAEID | Issue Writer Certificate

Keywords

adakiteQ2

calc alkalineQ2

garnet amphiboliteQ1

active continental marginQ2

KhousfQ2

Lut blockQ2

Abstract

The study area is located 10 km east of Khousf (southwest of Birjand), in the northwestern margin of Lut block and it’ s boundary with Sistan suture zone. Eocene-Oligocene volcanics (dacite, rhyodacite, andesite, trachy andesite, and basaltic andesite), subvolcanic rocks (microdiorite) and pyroclastics (tuff, bereccia and agglomerate) are observed in this area crosscutting the upper Cretaceous ophiolitic melange and Eocene flysch. Mineralogically, the andesite is dominated by the presence of poikilitic plagioclase, hornblende, biotite and pyroxene with porphyritic and microgranular groundmass, glomerophorphyritic and poikilitic textures. Quartz, plagioclase, hornblende, biotite and sometimes pyroxene are the essential minerals in the dacites and fine crystals of sanidine in the trachy andesites and the rhyodacite. Amphibolitic and pelitic xenolites are common in the investigated rocks. Disequilibium evidences such as sieve texture, zoning, resorption rim, rounding, corrosion and dusty margins are observed in these units. The studied rocks belong to the medium to high potassium calc-alkaline series. The trace and REE patterns normalized to primitive mantle and chondrite show these volcanics are co-magmatic and have high LREE / HREE that represents a subduction-related environment and active continental margin. Geochemical evidences demonstrate that these volanics have high SiO2 adakitic nature. Based on the petrogenetic diagrams the rocks under study generated from partial melting of metasomatized mantle wedge and or garnet amphibolitic source resulting of thickened lower crust.

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APA: Copy

Yousefzadeh, Mohammad Hossein, Rahmani, Asiyeh, & MOHAMMADI, SEYED SAEID. (2019). Petrology and tectonomagmatic setting of volcanic and subvolcanic rocks in the east of Khousf (Southwest of Birjand). PETROLOGY, 10(37 ), 1-22. SID. https://sid.ir/paper/388285/en

Vancouver: Copy

Yousefzadeh Mohammad Hossein, Rahmani Asiyeh, MOHAMMADI SEYED SAEID. Petrology and tectonomagmatic setting of volcanic and subvolcanic rocks in the east of Khousf (Southwest of Birjand). PETROLOGY[Internet]. 2019;10(37 ):1-22. Available from: https://sid.ir/paper/388285/en

IEEE: Copy

Mohammad Hossein Yousefzadeh, Asiyeh Rahmani, and SEYED SAEID MOHAMMADI, “Petrology and tectonomagmatic setting of volcanic and subvolcanic rocks in the east of Khousf (Southwest of Birjand),” PETROLOGY, vol. 10, no. 37 , pp. 1–22, 2019, [Online]. Available: https://sid.ir/paper/388285/en

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