Geological society of America , 2009-10-18

Title : ( Geology and petrology of two distinct types of granitoids, Eastern Najmabad, Ghonabad, Iran )

Authors: Mohammad Hassan Karimpour , C.R. Stern , G Lang Farmer , Mehrab Moradi Noghondar ,

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Counter-clockwise rotation of the Lut Block since the Triassic caused strike-slip faulting and folding in eastern Najmabad, eastern Iran. Regional sub-greenschist to greenschist facies metamorphism associated with Jurassic-Cretaceous deformation has turned Jurassic shales and sandstones into slates and quartzites. An east-west trending biotite granodiorite porphyry pluton, 26×4 km2 in size, intruded these Jurassic slates and quartzites. Based on mineralogy and low values of magnetic susceptibility [(5 to 11) × 10-5 SI], this granodiorite is classified as belonging to the ilmenite-series of reduced S-type type granitoids. Chemically it is met-aluminous, with relative enrichment in LILE = Rb, Ba, Zr, Th, Hf, K and LREE, and depletion in Sr, P, Ti and HREE. Based on REE content and low (La/Yb)N = 7-11.5, this pluton originated from melting of continental crust during the Jurassic-Cretaceous orogeny that caused regional metamorphism. Sub-volcanic monzonitic porphyries formed as younger stocks intruded into the granodiorite. Based on mineralogy and high values of magnetic susceptibility [(500) × 10-5 SI], these are classified as belonging to the magnetite-series of oxidized I-type granitoids. At the Hired Au-Sn prospect two distinct S and I type granitoids were also identified (Karimpour et al., 2009 . Petrochemistry of the Reduced, Ilmenite-Series Granitoid Intrusion Related to the Hired Gold-Tin Prospect (Basiran), Eastern Iran. J. of Applied Sciences 9: 226-236. At Hired the initial 87Sr/86Sr of S-type is 0.706200 and the I-type is 0.705074. Based on Rb-Sr and REE data, the S-type originated from the continental crust, but I-type did not.

Keywords

, Lut block, I-S-type granitoids, Regional metamorphism, Sn,
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@inproceedings{paperid:1012281,
author = {Karimpour, Mohammad Hassan and C.R. Stern and G Lang Farmer and Moradi Noghondar, Mehrab},
title = {Geology and petrology of two distinct types of granitoids, Eastern Najmabad, Ghonabad, Iran},
booktitle = {Geological society of America},
year = {2009},
location = {USA},
keywords = {Lut block; I-S-type granitoids; Regional metamorphism; Sn; Rb-Sr},
}

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%0 Conference Proceedings
%T Geology and petrology of two distinct types of granitoids, Eastern Najmabad, Ghonabad, Iran
%A Karimpour, Mohammad Hassan
%A C.R. Stern
%A G Lang Farmer
%A Moradi Noghondar, Mehrab
%J Geological society of America
%D 2009

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