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Origin and Evolution of Oscillatory Zoned Garnet from Kasva Skarn, Northeast Tafresh, Iran

Mirnejad, Hassan and Hasannejad, Mahbobeh and Miller, Nathan and Hassanzadeh, Jamshid and Bocchio, Rosangela and Modabberi, Soroush (2018) Origin and Evolution of Oscillatory Zoned Garnet from Kasva Skarn, Northeast Tafresh, Iran. Canadian Mineralogist, 56 (1). pp. 15-37. ISSN 0008-4476.

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Within the central Urumieh-Dokhtar Magmatic Belt of northern Iran, the Kasva skarn deposit (KSD) formed by metasomatic alteration of Eocene intercalated carbonate and volcaniclastic sediments in response to Oligo-Miocene intrusion by granitoid porphyries. The KSD contains abundant oscillatory-zoned garnet crystals, which are characterized by isotropic cores of nearly pure andradite that are rimmed by anisotropic grossular–andradite (grandite). The Fe-rich andraditic cores are enriched in U and LREE, with positive Eu anomalies, whereas the Al-rich granditic rims are enriched in Ti, Nb, Zr, Hf, and HREE, without Eu anomalies. Variation in optical and chemical features in Fe- and Al-rich garnet are controlled by external factors such as (1) infiltration of compositionally distinct fluids, (2) incorporation of LREE and U at the {X} site in association with substitution of Fe^(3+) for Al^(3+) at [Y] within the crystal structure of andraditic garnet, and (3) substitution of Ti and HFSE for Al in granditic garnet.

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Mirnejad, Hassan0000-0001-9776-3570
Additional Information:© 2018 Mineralogical Association of Canada. Received June 7, 2017. Revised manuscript accepted November 22, 2017. Published online before print January 23, 2018.
Subject Keywords:garnet, skarn, zonation, Kasva
Issue or Number:1
Record Number:CaltechAUTHORS:20180124-084728987
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Official Citation:Hassan Mirnejad, Mahbobeh Hasannejad, Nathan Miller, Jamshid Hassanzadeh, Rosangela Bocchio, and Soroush Modabberi Origin and Evolution of Oscillatory Zoned Garnet From Kasva Skarn, Northeast Tafresh, Iran Can Mineral 2018 56:15-37; published ahead of print January 23, 2018, doi:10.3749/canmin.1700039
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84497
Deposited By: Tony Diaz
Deposited On:25 Jan 2018 17:23
Last Modified:09 Mar 2020 13:19

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