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Geological and geochemical constraints on the Cheshmeh-Frezi volcanogenic stratiform manganese deposit, southwest Sabzevar basin, Iran
Sajjad Maghfouri;  Ebrahim Rastad;  Fardin Mousivand;  Flavien Choulet;  Lin Ye
2017
Source PublicationOre Geology Reviews
Volume89Pages:96-113
Abstract

The Cheshmeh-Frezi Mn deposit belongs to the southwest Sabzevar basin to the north of the Central Iranian microcontinent. This basin, which hosts abundant mineral deposits including Mn exhalative and Besshi-type Cu-Zn volcanogenic massive sulfide deposits, followed an evolution closely related to the subduction of the Neo-Tethys oceanic crust beneath the Central Iranian microcontinent. Two major sedimentary sequences are recorded within this basin: (I) the Lower Late Cretaceous volcano sedimentary sequence (LLCVSS) and (II) the Upper Late Cretaceous sedimentary dominated sequence (ULCSS). The Cheshmeh-Frezi Mn deposit is hosted within red tuff with interbeds of green tuffaceous sandstone of the LLCVSS. Mineralization occurs as stratiform blanket-like and tabular orebodies. Psilomelane, pyrolusite and braunite are the main minerals of the ore, which display a variety of textures. Such as layered, laminated, disseminated, massive, replacement or open space fillings. The footwall and hanging-wall volcanic rocks are predominantly andesite and trachyandesite rocks. Footwall and hanging wall volcanic rocks at Cheshmeh-Frezi are enriched in light rare earth elements (LREEs) compared to chondrite, have steep REE patterns, and generally show Ta and Nb depletions relative to chondrite which are characteristic of back-arc environments. The significant geochemical characteristics of ore such as high Mn content (12.41-33.14 wt%; average 19.41 wt%), low concentration of Fe (0.64-2.27 wt%; average 1.63 wt%), high Ba (49.7-9901 ppm, average 2728.67 ppm), LREE > HREE, and negative Ce and Eu anomalies reveal a primary distal hydrothermal-exhalative source for mineralization. Cheshmeh-Frezi deposit, in comparison with different types of volcanogenic manganese deposits shows broad similarities with the Cuban-type Mn deposits such as tectonic, host and associated rock types, geometry, textures, structures, mineralogy and lithogeochemistry.

KeywordManganese Cheshmeh-frezi Volcano-sedimentary Sequence Late Cretaceous Cuban-type Sabzevar Zone
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8028
Collection矿床地球化学国家重点实验室
Affiliation1.Department of Geology, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran
2.School of Geosciences, Shahrood University of Technology, Shahrood, Iran
3.Chrono-Environnement, Université de Franche-Comté/CNRS, 25030 Besançon cedex, France
4.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
Recommended Citation
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Sajjad Maghfouri;Ebrahim Rastad;Fardin Mousivand;Flavien Choulet;Lin Ye. Geological and geochemical constraints on the Cheshmeh-Frezi volcanogenic stratiform manganese deposit, southwest Sabzevar basin, Iran[J]. Ore Geology Reviews,2017,89:96-113.
APA Sajjad Maghfouri;Ebrahim Rastad;Fardin Mousivand;Flavien Choulet;Lin Ye.(2017).Geological and geochemical constraints on the Cheshmeh-Frezi volcanogenic stratiform manganese deposit, southwest Sabzevar basin, Iran.Ore Geology Reviews,89,96-113.
MLA Sajjad Maghfouri;Ebrahim Rastad;Fardin Mousivand;Flavien Choulet;Lin Ye."Geological and geochemical constraints on the Cheshmeh-Frezi volcanogenic stratiform manganese deposit, southwest Sabzevar basin, Iran".Ore Geology Reviews 89(2017):96-113.
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