Orogen-struktur und Metallverteilung Im östlichen Zagros (Südost-Iran)

Walther, Hansjust W.

doi:10.1007/bf01786851

Cited by 37 publications

(6 citation statements)

References 3 publications

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“…At Narigan, a manganiferous jaspilite is known over a distance of i km with a thickness between 3 and 15 m. It has been metamorphosed in the contact zone of the Narigan Granite (Walther, 1960) to a pyrolusite-magnetite-hematitequartzite which was eventually enriched by weathering to a psilomelane-pyrolusite-limonite ore with 15 percent MnO2 and 40 percent Fe (probable reserves are 50 Mt, small open pit by NISCO). At Narigan, a manganiferous jaspilite is known over a distance of i km with a thickness between 3 and 15 m. It has been metamorphosed in the contact zone of the Narigan Granite (Walther, 1960) to a pyrolusite-magnetite-hematitequartzite which was eventually enriched by weathering to a psilomelane-pyrolusite-limonite ore with 15 percent MnO2 and 40 percent Fe (probable reserves are 50 Mt, small open pit by NISCO).…”

Section: Other Types Of Mineralizationmentioning

confidence: 99%

The Bafq mining district in central Iran; a highly mineralized Infracambrian volcanic field

Foerster

Jafarzadeh²

1994

Economic Geology

139

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The paper describes for the first time the Bafq mining district and its deposits of magnetite, apatite, manganese, and base metals. It is based on two decades of field work and the re-evaluation of more than 50,000 m of drill cores. Central Iran is a fragment of Gondwana with a Precambrian basement. Within a Pan-Afri-can rift zone a huge Infracambrian volcanic field was formed on top of a silicic diapir, with ignimbritic cauldrons, ring fracture intrusions, and resurgent granites. The volcanic field was partly covered by a shallow sea (shales, dolomitized reefs, salt, and gypsum beds). Along the ring fractures, phreatomagmatic explosions led to the formation of diatremes. They are filled with tuffs, which include basement xenoliths and fragments of rocks which had covered the basement during diatreme formation but which have been eroded together with the uppermost part of the diatreme (eroded xenoliths), welded agglutinates, intrusive breccias, and multiple intrusions of aplosyenite (anorthoclase, scapolite), hornblendite (diopside, magnesio-hornblende), and magnetitite (magnetite, REE-rich fiuorapatite). The magmatic material is considered to be the product of differentiation and liquid immiscibility of a melanephelinitic melt. Magnetitite also occurs as lava flows, sills, dikes, and pyroclastic ores. The explored diatremes of Choghart (mined since 1971), Chador Malu (stripping commenced in 1992), Se Chahun, and Chah Gaz contain 750 Mt of iron ores. Esfordi, a funnel filled with 50 Mt of magnetite-pyroxene-apatite, is being explored. Anomaly XX is a large magnetite prospect associated with uranothorianite mineralization at Duzakh Darreh. Narigan is a manganiferous jaspilite deposit situated in the former moat. Kushk is a subaqueous-hydrothermal massive lead-zinc deposit intercalated in Infracambrian (informal designation in Iran for Upper Riphean-Vendian; 750-570 Ma) volcanics. It is being mined and has 4 Mt of reserves. 0361-0128/94/1635/1697-25$4.00 1697 16 9 8 FORSTER AND JAFARZADEH 32 • 15• 31' 45' Moghestan ß 2171 m Saghand ß 2o14 m o xxI Sagh•)nd&3• Kavir-e-Saghand 1985 m Chador ß Malu O 2279 m ß 2309 m XVlll B O Chah Gaz O Adz 2281 m O XlII an Se Chahun To YAZD Nord O lB( Mishdovan • X 0 0 XII Esfordi o Lake Siah Chogha• O II Kushk ß Narigan 2225 m ß 2985 m O Sheitur 990 m O IV Murgirt ß 2879 m I i I 55 ø 00' 55 ø 15' 55 = 30' 55 ø 45' 56 ø 00' asphalt ß town or village track ß sulfide deposit 0 magnetite deposit (name or no. of magnetic anomaly) salt flat uranium prospect ß mountain (elevation in meters) F[c. 1. Location map of the Bafq district. ß 2281 m Buhabad 1391 m Bashkan BAFQ DISTRICT, CENTRAL IRAN 1699 Choghart (probably) as magnetite-carbonatite type. He favored the concept of a magnetite melt, because it is hard to believe that a granite magma could be the source for orebodies containing several million tons of iron.The authors of this paper have incorporated their results of 20 years of field work to make the following points: the ore district is part of a Pan-African Infracambrian extensional...

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Section: Other Types Of Mineralizationmentioning

confidence: 99%

The Bafq mining district in central Iran; a highly mineralized Infracambrian volcanic field

Foerster

Jafarzadeh²

1994

Economic Geology

139

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“…Zagros fold thrust belt (Walther, 1960). Origin of macroscopic and glittery hematite in 705 the "dirty" rock salts is in this study interpreted to be produced during early 706 diagenesis of iron-rich terrigenous sediments (Braitsch, 1971), namely the magenta 707 colored siltstones.…”

mentioning

confidence: 94%

Impact of solid second phases on deformation mechanisms of naturally deformed salt rocks (Kuh-e-Namak, Dashti, Iran) and rheological stratification of the Hormuz Salt Formation

Závada

Desbois

Urai

et al. 2015

Journal of Structural Geology

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“…However, no porphyry systems have positively been identified to date in this otherwise permissive island-arc setting (Walther, 1960;Samani, 1998;Förster, 1978;Shahabpour, 2010;Bazin and Hübner, 1969a). As in the Sanandaj-Sirjan Terrane to the west, Late Cretaceous-late Eocene igneous rocks in this fold-and-thrust belt appear deeply exhumed.…”

Section: Porphyry-related Prospectsmentioning

confidence: 99%

“…Thus, relatively deep erosion coupled with thick intervening synorogenic and younger sedimentary cover may be responsible for limiting appropriate preservation and exposure levels for porphyry systems. Based on reports of copper occurrences that are spatially associated with subvolcanic porphyry intrusions (Geological Survey of Iran, 2012a;Huber, 1978;Walther, 1960;Shahabpour, 1999), two copper-bearing prospects that may be porphyry-related (Mahallaty2 and Shir Kuh (Makran) are tentatively included in this tract (see appendix C; fig. 36).…”

Section: Porphyry-related Prospectsmentioning

confidence: 99%

See 1 more Smart Citation

Porphyry copper assessment of the Tethys region of western and southern Asia: Chapter V in <i>Global mineral resource assessment</i>

Zürcher¹,

Bookstrom²,

Hammarstrom³

et al. 2015

Scientific Investigations Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS (1-888-275-8747).For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod.To order this and other USGS information products, visit http://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report.Suggested citation: Zürcher, L., Bookstrom A.A., Hammarstrom, J.M., Mars, J.C., Ludington, S., Zientek, M.L., Dunlap, P., and Wallis, J.C., with contributions from Drew, L.J., Sutphin, D.M., Berger, B.R., Herrington, R.J., Billa, M., Kuşcu, I., Moon, C.J. ,and Richards, J.P., 2015, Porphyry copper assessment of the Tethys region of western and southern Asia: U.S. Geological Survey Scientific Investigations Report 2010-5090-V, 232 p., and spatial data, http://dx.doi.org/10.3133/sir20105090V. AbstractA probabilistic mineral resource assessment of undiscovered resources in porphyry copper deposits in the

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Orogen-struktur und Metallverteilung Im östlichen Zagros (Südost-Iran)

Cited by 37 publications

References 3 publications

The Bafq mining district in central Iran; a highly mineralized Infracambrian volcanic field

The Bafq mining district in central Iran; a highly mineralized Infracambrian volcanic field

Impact of solid second phases on deformation mechanisms of naturally deformed salt rocks (Kuh-e-Namak, Dashti, Iran) and rheological stratification of the Hormuz Salt Formation

Porphyry copper assessment of the Tethys region of western and southern Asia: Chapter V in <i>Global mineral resource assessment</i>

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