Daliran, Farahnaz, Stosch, Heinz-Guenter, and Williams, Patrick J. (2009) A review of the Early Cambrian magmatic and metasomatic events and their bearing on the genesis of the Fe oxide-REE-apetite deposits (IOA) of the Bafq district, Iran. In: Proceedings of the 10th Biennial Meeting of the the SGA 2009 (2) pp. 623-625. From: Smart Science for Exploration and Mining: 10th Biennial Meeting of the SGA 2009, 17-20 August 2009, Townsville, QLD, Australia.

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Abstract

Fe oxide–apatite(REE) (IOA) and the REE-apatite phosphate deposits of the Bafq district are hosted by Early Cambrian (528 Ma) rhyolitic rocks and by rhyolite-associated volcanosedimentary units. The rhyolites are part of an episode of rhyolite–spilitic basalt bimodal volcanism with rare undersaturated rocks (nephelinites or basanites) and minor andesites that were intruded by subvolcanic alkali leucogranites (524-529 Ma). The bimodal volcanism was followed by terminal alkali diabase dikes. Reconstruction of the regional and local geological events indicates a close link between the rhyolitic volcanism, the subsequent regional Na- and K-feldspar metasomatism, and the Fe oxide–apatite(REE) mineralization. The regional alkali metasomatism caused spilitization of the basalts and locally transformed the rhyolites to "keratophyres" and “albitites”. The alkali metasomatism was followed by a complex deposit scale, Ca(Mg)-rich, Fe-P-REE alteration with late REE(Th)-carbonate-silica overprinting and accumulation of 2 Gt, high-grade Fe oxide ore along the structurally controlled metallogenic province of Bafq. This sequence of events thus reflects a specific tectonomagmatic evolution of the Bafq zone, within the Early Cambrian Kashmar-Kerman magmatic arc, which was characterized by rifting episodes associated with alkali metasomatism and Fe oxideapatite (REE) mineralization.

Item ID:	27724
Item Type:	Conference Item (Research - E1)
ISBN:	978-0-9805-5868-5
Keywords:	Fe oxide-apatite (REE), IOA, bimodal volcanism, alkali metasomatism, Bafq, Iran
Related URLs:	Organisation
Date Deposited:	18 Jun 2013 05:40
FoR Codes:	04 EARTH SCIENCES > 0403 Geology > 040303 Geochronology @ 100%
SEO Codes:	84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840102 Copper Ore Exploration @ 33% 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840104 Iron Ore Exploration @ 33% 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840105 Precious (Noble) Metal Ore Exploration @ 34%
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