علوم زمین, ( ISI ), Volume (15), No (3), Year (2011-9) , Pages (1-23)

Title : ( Rb–Sr and Sm–Nd isotopic compositions, U-Pb Age and Petrogenesis of Khajeh Mourad Paleo-Tethys Leucogranite, Mashhad, Iran )

Authors: Mohammad Hassan Karimpour , G. L. Farmer , C. R. Stern ,

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Abstract

Biotite-muscovite leucogranite and associated pegmatite intruded meta-ophiolite and meta-flysch (the remnants of Paleo-Tethys) during collision of Turan plate with Iran plate. Four types of pegmatite dykes, crosscutting biotite muscovite leucogranite, are identified. The results of U-Pb zircon age of Khajeh Mourad biotite muscovite leucogranite is 205.9 ± 4.1 Ma (Late Triassic, Rhaetian). Chemically, biotite muscovite leucogranite and aplite granite are peraluminous S-type pluton. Magnetic susceptibility of biotite muscovite leucogranite and aplite granite are between than 0-5 × 10-5 and the ratio of ferric to ferrous ratio (< 0.35), therefore they are classified as belonging to the ilmenite-series (reduced type). The total REEs content of biotite muscovite leucogranite is between TREEs = 130-176 and aplite is very low Total REEs = 50.79. They have small negative Eu anomalies (Eu/Eu*= 0.52 to 0.76). The initial 87Sr/86Sr and (143Nd/144Nd)i was recalculated to an age of 205 Ma. Initial 87Sr/86Sr ratios for B-M leucogranite and aplite are 0.708161-0.709853. The (143Nd/144Nd)i isotope composition for B-M leucogranite 0.512214, aplite dykes 0.512024. Initial ε Nd isotope values for B-M leucogranite -6.48 and aplite dykes is -6.83. These values could be considered as representative of continental crust-derived magmas. The ratios of Rb/Sr = 1-1.3 and CaO/Na2O  0.3 of biotite-muscovite leucogranite indicate that the source rock had a composition between meta-pelite and meta-psammite

Keywords

, U-Pb, Zircon, Leucogranite, ilmenite series, Magnetic susceptibility, pegmatite
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@article{paperid:1019219,
author = {Karimpour, Mohammad Hassan and G. L. Farmer and C. R. Stern},
title = {Rb–Sr and Sm–Nd isotopic compositions, U-Pb Age and Petrogenesis of Khajeh Mourad Paleo-Tethys Leucogranite, Mashhad, Iran},
journal = {علوم زمین},
year = {2011},
volume = {15},
number = {3},
month = {September},
issn = {1023-7429},
pages = {1--23},
numpages = {22},
keywords = {U-Pb; Zircon; Leucogranite; ilmenite series; Magnetic susceptibility; pegmatite},
}

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%0 Journal Article
%T Rb–Sr and Sm–Nd isotopic compositions, U-Pb Age and Petrogenesis of Khajeh Mourad Paleo-Tethys Leucogranite, Mashhad, Iran
%A Karimpour, Mohammad Hassan
%A G. L. Farmer
%A C. R. Stern
%J علوم زمین
%@ 1023-7429
%D 2011

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