Mineralogy, petrology and geochemistry of mafic dikes in the southeast Jebal-E-Barez  Granitoids (Bam, Kerman province, Iran): Studies from mafic dikes formed in a  volcanic arc-setting

Shirin BEHPOUR; Abbas MORADIAN; Hamid AHMADIPOUR; Kazuo NAKASHIMA

Makale detayları

Mineralogy, petrology and geochemistry of mafic dikes in the southeast Jebal-E-Barez Granitoids (Bam, Kerman province, Iran): Studies from mafic dikes formed in a volcanic arc-setting

Yazarlar:

Shirin BEHPOUR | Abbas MORADIAN | Hamid AHMADIPOUR | Kazuo NAKASHIMA

Yayıncı:

TUBITAK

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Turkish Journal of Earth Sciences 2019 Vol.28 Issue 6, pp.920-938

Belge Tipi:

Makale

Yayın Tarihi:

11/2019

Belge Dili:

İngilizce

Document ID (Org No.):

2000730960

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985

Özet:

 

In the southeastern part of the Jebal-E-Barez Oligocene granitoids (Kerman province, Iran), there are numerous mafic dikes  and this work attempts to investigate the petrological, geochemical and mineral chemistry of these dikes. The dikes clearly follow faults  which trend mainly N50-70W and N20-40W. Their thicknesses vary from 1 cm to 3 m and their contacts with the host granitic rocks  are sharp without any extensive contact metamorphism which may be due to the lack of magmatic fluids. The Jebal-E-Barez mafic dikes  contain plagioclase, clinopyroxene and amphibole as major minerals and overall show porphyritic texture, but intergranular, ophitic  and subophitic textures are also visible. The amphiboles are classified mainly as paragasite and tschermakite. These are magmatic, as  indicated by Si content of the studied mafic dikes. Based on Al-in-hornblende geothermobarometry, average crystallization pressures  are estimated from 5.25 to 7.07 kbar and temperatures from 867 to 872 °C. Thermobarometric estimations show temperatures of 1000  ± 200 °C and depth of 30?40 km for crystallization of the clinopyroxenes. Chemical composition of the amphiboles suggests the parent  magmas of the mafic dikes derived from a mantle source. Whole rock geochemistry data reveal that the studied dikes belong to the  calc-alkaline magma series. They are enriched in light rare earth elements (LREE) and large ion lithophile elements (LILE) such as Cs,  Rb, Ba, and Sr, with negative anomalies for high-field-strength elements (HFSE) such as Nb and Ta. The weak negative Eu anomaly is  evidence of a slightly earlier separation of a mineral phase such as plagioclase. According to trace element abundances, Ba/Nb, Ce/Yb,  and Zr/Y ratios, and tectono-magmatic discrimination diagrams, the primitive magma derived from an enriched garnet-free mantle  source, contaminated by the crust and emplaced in continental arc environment.

Makale detayları

Mineralogy, petrology and geochemistry of mafic dikes in the southeast Jebal-E-Barez Granitoids (Bam, Kerman province, Iran): Studies from mafic dikes formed in a volcanic arc-setting

Yazarlar: Shirin BEHPOUR | Abbas MORADIAN | Hamid AHMADIPOUR | Kazuo NAKASHIMA

Yayıncı: TUBITAK

Ana Başlıklar: Uygulamalı fizik

Dergi: Turkish Journal of Earth Sciences 2019 Vol.28 Issue 6, pp.920-938

Belge Tipi: Makale

Yayın Tarihi: 11/2019

Belge Dili: İngilizce

Document ID (Org No.): 2000730960

Sıklık: İki Aylık

eISSN: 1303-619X

pISSN: 1300-0985

Sayı

Yazarlar:

Shirin BEHPOUR | Abbas MORADIAN | Hamid AHMADIPOUR | Kazuo NAKASHIMA

Yayıncı:

TUBITAK

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Turkish Journal of Earth Sciences 2019 Vol.28 Issue 6, pp.920-938

Belge Tipi:

Makale

Yayın Tarihi:

11/2019

Belge Dili:

İngilizce

Document ID (Org No.):

2000730960

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985