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Permanent link (DOI): https://doi.org/10.7939/R3R49GF60

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Geology, Geochemistry, Geochronology, and economic potential of the Taftan volcanic complex, southeastern Iran Open Access

Descriptions

Other title
Subject/Keyword
Taftan
Geology
Geochemistry
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Razavi Khosroshahi, Seyed Amir Mohammad
Supervisor and department
Richards, Jeremy P (Eaerth and Atmospheric Sciences)
Examining committee member and department
Creaser, Robert (Eaerth and Atmospheric Sciences)
Stachel, Thomas (Eaerth and Atmospheric Sciences)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2015-07-07T11:14:19Z
Graduation date
2015-11
Degree
Master of Science
Degree level
Master's
Abstract
The late Miocene-Quaternary Taftan volcanic complex is located above the Makran subduction zone in Sistan and Baluchestan province of southeastern Iran. The earliest volcanic eruptions at Taftan started in the late Miocene (~8 Ma) by explosive eruption of andesitic to dacitic lava on the Cretaceous to Eocene volcanic and sedimentary paleosurface ~20 km to the northwest of the current edifice. Later Plio-Pleistocene volcanism consisted of voluminous andesitic and dacitic lavas and pyroclastic flows (~3.1-0.4 Ma). The major and trace element compositions of the Taftan volcanic rocks show calc-alkaline to high-K calc-alkaline affinity with depletions of Nb, Ta, and Ti and relative enrichment of large-ion lithophile elements (LILE) and Th and U; these are typical signatures of subduction-related arc magmas. From the late Miocene to the late Pleistocene La/Yb and Sr/Y ratios of the Taftan volcanic rocks increase, which likely reflects fractional crystallization of pyroxene and amphibole. Electron microprobe analysis of amphibole phenocrysts from the Taftan volcanic rocks show that amphibole chemistry changed from high-Al pargasite to low-Al magnesio-amphibole from the late Miocene to the Pleistocene. Detailed modelling of amphibole chemistry indicates that the host magmas were water saturated (>5 wt.% H2O) and underwent partial crystallization at various depths between ~20 to ~5 km in the upper crust prior to eruption. Temperature and oxidation state estimates obtained from magnetite-ilmenite mineral pairs from andesites and amphibole phenocrysts in andesites show that they crystallized at temperature from ~1000°C to ~800C under moderately oxidizing conditions (FMQ +1.7 ± 0.3). The presence of small porphyry and epithermal prospects such as the Kharestan Cu porphyry (6.10 ± 0.40 Ma) and Siah jangal epithermal Au deposit in the late Miocene, and several argillic to advanced argillic fumarolic alteration zones in the Taftan Plio-Pleistocene volcanic rocks suggest the potential for additional porphyry and epithermal style mineralization within the volcanic edifice at depth.
Language
English
DOI
doi:10.7939/R3R49GF60
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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