MINERAL CHEMISTRY, THERMO BAROMETRY AND PETRO GENESIS OF BAND-E-HEZARCHAH DIKE SWARMS (SOUTHEAST OF SHAHROOD)

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HOSSEINI SEYED HOSSEIN; SADEGHIAN MAHMOUD; ZHAI MINGGUO; GHASEMI HABIBOLLAH

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Journal: PETROLOGY Year:2016 | Volume:7 | Issue:25 Page(s): 81-96

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Title

MINERAL CHEMISTRY, THERMO BAROMETRY AND PETRO GENESIS OF BAND-E-HEZARCHAH DIKE SWARMS (SOUTHEAST OF SHAHROOD)

Author(s)

HOSSEINI SEYED HOSSEIN | SADEGHIAN MAHMOUD | ZHAI MINGGUO | GHASEMI HABIBOLLAH | Issue Writer Certificate

Keywords

MINERAL CHEMISTRYQ1

THERMO BAROMETRYQ1

PETRO GENESISQ1

BAND-E HEZARCHAH DYKE SWARMSQ1

MIDDLE CIMMERIAN OROGENYQ1

Abstract

The Band-e-Hezarchah dyke swarms is located in the northern margin of Central Iran structural zone. These diabase dyke swarms have crosscut the late Neoproterozoic– early Cambrian granitoids pluton, metapelites, meta psammites and gneissic rocks and late Triassic – early Jurassic conglomerates, sandstones and shales (equal to Shemshak formation in Alborz zone) but they haven' t cut the younger rocks such as lower Cretaceous (Neocomian) limestones. Plagioclase, pyroxene and opaque minerals are the main rock-forming minerals. Plagioclase is mostly albite, oligoclase, andesine and labradorite with An=1.3-50.5, Or=0.6-6.1 and Ab=48.3-98.18. Pyroxene with Wo=36.7-44.4, En=37.3-47.3 and Fs=11.8-21.2, is augite. Amphibole and chlorite are main secondary minerals. Amphibole is mostly magnesio hornblende, with Si=6.5-6.8 a.p.f.u., XMg=0.65- 0.71 and A-site=0.17-0.39. Chlorite with Si=4-5.53a.p.f.u. and XFe=0.84-0.91 is mostly daphnite and pseudothuringite. Temperatures and pressures obtained from clinopyroxene THERMO BAROMETRY are in the range of 1100-1190°C and 2-7.2 kbar respectively. Based on the results of bulk rock trace and rare earth elements, these rocks have alkaline to subalkaline nature and their magma forming originated by 8-10% partial melting of a spinel lherzolitic source. These rocks have formed in an initial back arc basin setting related to subduction of Neo- Tethys oceanic lithosphere beneath the Central Iran micro continent during Middle Jurassic. This magmatic event is a consequent of MIDDLE CIMMERIAN OROGENY.

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APA: Copy

HOSSEINI, SEYED HOSSEIN, SADEGHIAN, MAHMOUD, ZHAI, MINGGUO, & GHASEMI, HABIBOLLAH. (2016). MINERAL CHEMISTRY, THERMO BAROMETRY AND PETRO GENESIS OF BAND-E-HEZARCHAH DIKE SWARMS (SOUTHEAST OF SHAHROOD). PETROLOGY, 7(25), 81-96. SID. https://sid.ir/paper/196921/en

Vancouver: Copy

HOSSEINI SEYED HOSSEIN, SADEGHIAN MAHMOUD, ZHAI MINGGUO, GHASEMI HABIBOLLAH. MINERAL CHEMISTRY, THERMO BAROMETRY AND PETRO GENESIS OF BAND-E-HEZARCHAH DIKE SWARMS (SOUTHEAST OF SHAHROOD). PETROLOGY[Internet]. 2016;7(25):81-96. Available from: https://sid.ir/paper/196921/en

IEEE: Copy

SEYED HOSSEIN HOSSEINI, MAHMOUD SADEGHIAN, MINGGUO ZHAI, and HABIBOLLAH GHASEMI, “MINERAL CHEMISTRY, THERMO BAROMETRY AND PETRO GENESIS OF BAND-E-HEZARCHAH DIKE SWARMS (SOUTHEAST OF SHAHROOD),” PETROLOGY, vol. 7, no. 25, pp. 81–96, 2016, [Online]. Available: https://sid.ir/paper/196921/en

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