Petrography, geochemistry and petrogenesis of Alvand batholith leucocratic granites

Hajhassani, Hojjat; Ghalamghash, Jalil; Vousoughi Abedini, Mansour; Dabiri, Rahim; Rashid, Hamideh

doi:10.22071/gsj.2020.183525.1646

Document Type : Original Research Paper

Authors

¹ Ph.D.Student, Department of Geology, Science and Research Branch, Islamic azad University, Tehran, Iran

² Associate Professor, Research Institute for Earth Sciences, Tehran, Iran

³ Professor, Department of Geology, Science and Research branch, Islamic azad University, Tehran, Iran

⁴ Associate Professor, Department of Geology, Mashhad Branch, Islamic azad University, Mashahd, Iran

⁵ Ph. D., Geological Survey of Iran, Tehran, Iran

https://doi.org/10.22071/gsj.2020.183525.1646

Abstract

The leucocratic granite emplaced as small masses and dykes in the Alvand batholith. The leucocratic granite consists of tourmaline alkali granite, biotite alkali granite, arfvedsonite alkali granite, rutil alkali granite, and biotite- muscovite granites with alkaline and peraluminous affinities. They show enrichments of LREEs relative to HREEs and LILE relative to HFSE with negative anomalies in Nb, Ta and Ti, in normalized trace element diagrams. The leucocratic granite of the Alvand batholith resemble A-type and can be further classified in two of A and A' types granite. The trace elements content of A-type is much higher than A'-type granite. Based on geochemical data, it seems that A- and A'-type granites were generated from partial melting of mantle source. As mantle magma ascends, fractionate and empalce into the crust, A-type leucocratic are formed with minimal contamination and A'-type leucocratic with significant contaminant with continent crust are formed.
Field and geochronology data suggest that the leucocratic granite were generated in the late Jurassic, which is contemporaneous with the subduction of the Neo-Tethys oceanic crust beneath the central Iran. It seems that the leucocratic granites were emplaced during a local extensional phase as dykes and small bodies in the Alvand batholith.

Keywords

20.1001.1.10237429.1399.30.118.6.6

Main Subjects

Petrology

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Scientific Quarterly Journal of Geosciences

Petrography, geochemistry and petrogenesis of Alvand batholith leucocratic granites

References

References

Volume 30, Issue 118 - Serial Number 118
Vo. 30, No, 118, Winter 2021
January 2021
Pages 61-70

Petrography, geochemistry and petrogenesis of Alvand batholith leucocratic granites

References

References

Volume 30, Issue 118 - Serial Number 118Vo. 30, No, 118, Winter 2021January 2021Pages 61-70

Volume 30, Issue 118 - Serial Number 118
Vo. 30, No, 118, Winter 2021
January 2021
Pages 61-70