Genesis of the Nasirabad manganese occurrence, Fars province, Iran: Geochemical evidences

Zarasvandi, Alireza; Lentz, David R.; Rezaei, Mohsen; Pourkaseb, Houshang

doi:10.1016/j.chemer.2013.02.003

Cited by 24 publications

(6 citation statements)

References 51 publications

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“…The V/(V + Ni) value increases with increasing detrital input (Zarasvandi et al 2013). Considering the V/(V + Ni) ratios (0.68 to 0.25 in the studied samples) and the Ce anom values of the studied samples, we concluded that the environment was affected by both oxic and anoxic conditions ( Table 2).…”

Section: Discussionmentioning

confidence: 78%

“…A negative Eu anomaly is indicative of a hydrothermal nature, and the absence of a significant positive Eu anomaly or the presence of a slight Eu anomaly may imply that the hydrothermal source was diluted by seawater (mixing with seawater) (Sabatino et al 2011). A negative Eu anomaly may also show that mineralization originated from a distal hydrothermal source (Zarasvandi et al 2013). Alternatively, a negative Eu anomaly is thought to represent an anoxic reducing environment (Constantopoulos 1988;Henderson, 1984).…”

Section: Discussionmentioning

confidence: 96%

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Geochemical evidence for the genesis of the Sarical-Yavu hematite mineralizations (Sivas, Central Turkey)

Öksüz

Koçak

2016

Arab J Geosci

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The hematite mineralization under investigation is located 11 km NE of Sarical (Yavu) village of the Yildizeli town (Sivas Province) in central Turkey. The region is within the Central Anatolian Thrust Zone and is comprised of metamorphic units, ophiolitic rocks and overlying Tertiary volcanic and volcanosedimentary rocks in addition to Neogene terrestrial deposits. The mineralization occurs as lenticular or bedded bodies and is composed chiefly of hematite and a lesser amount of goethite. Quartz, calcite, and dolomite are the gangue minerals. Kaolinite and zeolite are the common alteration products. In this study, geochemical and mineralogical investigations were carried out using an X-ray diffractometer analysis (XRD), Raman spectroscopy, and scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDX). The V/(V + Ni) ratio increases in parallel to the detritic contribution, and when this ratio is less than 0.60, deposition conditions are said to be anoxic. Considering the V/(V + Ni) ratio and Ce anom values of the studied samples, we suggest that the environment is both oxic and anoxic in character. The overall assessment of the field observations, mineral paragenesis, major, trace, and rare earth element (REE) data indicates that the Sarical hematite mineralization is of a hydrothermal-sedimentary type.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 96%

Geochemical evidence for the genesis of the Sarical-Yavu hematite mineralizations (Sivas, Central Turkey)

Öksüz

Koçak

2016

Arab J Geosci

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“…However, as noted above, Mn mineralization can form by a combination of these processes. Moreover, other parameters such as microbial processes and the selective enrichment of bio-essential elements and contribution of detrital materials can give some distinct geochemical characteristics to manganese and ferromanganese deposits (Polgari et al, 2012;Rezaei, 2012;Zarasvandi et al, 2013a). However, previous studies on the geological, mineralogical and geochemical characteristics of Tethyan manganese deposits have indicated that the majority of these deposits were derived originally by hydrothermal processes similar to those of the presentday mid-oceanic spreading centres (see Shah and Khan 1999;Karakus et al, 2010;Oksuz, 2011;Rezaei, 2012;Zarasvandi et al, 2013b).…”

Section: Discussionmentioning

confidence: 99%

“…et al, 1972). Field of Abadeh Tashk Mn-deposit from Rajabzadeh and Zamansani (2013), data of Sorkhvand manganese deposit from Sepahvand (2015), field of Nasirabad nodules and Mn-layers after Zarasvandi et al (2013a). Data of Wazirestan and Hazara hydrothermal manganese deposits in Pakistan after Shah and Khan (1999) and Shah and Moon (2007), Field of Haymana hydrothermal manganese deposit in Turkey from Karakus et al (2010).…”

Section: Discussionmentioning

confidence: 99%

Rare-earth element distribution and genesis of manganese ores associated with Tethyan ophiolites, Iran: A review

et al. 2016

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The Zagros orogenic and metallogenic belt is characterized by the widespread occurrence of manganese and ferromanganese deposits. These deposits are spatially associated with radiolarian cherts and basaltic rocks, which cap the ophiolite sequences. The present work provides a review on the rare-earth element (REE) geochemistry coupled with major- and trace-element geochemical characteristics of the Nasirabad and Abadeh Tashk manganese deposits (associated with the Neyriz ophiolite), and Sorkhvand manganese deposit (associated with the Kermanshah ophiolite). These data are used to gain an insight into the primary ore-forming processes that control the deposition of manganese ores. All of the selected manganese deposits have consistently high Ba contents and low concentrations of trace elements (Co, Cu and Ni) with high Mn/Fe ratios typical of hydrothermal activity. A relatively low REE abundance, Lan/Ndn ratios (>3), and position on a Lan/Cen vs. Al2O3/(Al2O3 + Fe2O3) discrimination plot indicate a distal hydrothermal source for almost all of the selected manganese deposits. Most of the deposits are characterized by Ceanom < –0.1 which reflects the prevailing oxidative conditions during the deposition of manganese ores. Importantly, this is consistent with the occurrence of non-sulfide oxic Mn mineralization in all the manganese deposits of the Zagros orogeny. The comparison of the Sorkhvand, Abadeh Tashk and Nasirabad manganese deposits with other manganese deposits elsewhere in the world indicates that major- and trace-element characteristics, as well as the REE composition of the Zagros manganese deposits are analogous to those typical of hydrothermal deposits.

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“…Eocene-Oligocene: The majority of the known manganese deposits of Iran were formed during this period. They are highly widespread particularly in central and eastern Iran, and are associated with daciticandesitic rocks, presenting hydrothermal origin (Zarasvandi et al, 2013). Miocene-Pliocene: Manganese deposits of this period are present mainly in the northwest of Iran (Simmonds & Ghasemi, 2007).…”

Section: Introductionmentioning

confidence: 99%

Geological and Geochemical Investigation of Three Ophiolite‐Hosted Manganese Prospects, Southeast of Birjand, South Khorasan, East of Iran

et al. 2017

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The studied ophiolite-hosted manganese prospects are located in southeast of Birjand, South Khorasan, in the east of Iran. The manganese ores within the ophiolitic sequence in this region occur as small discrete patches, associated with radiolarian chert and shale. Manganese ores in the host rocks are recognizable as three distinct syngenetic, diagenetic, and epigenetic features. The syngenetic manganese ores occurred as bands associated with light-red radiolarian chert. The diagenetic Mn ores occurred as lenses accompanied by dark-red to brown radiolarian chert. The epigenetic Mn ores occurred as veins/veinlets within the green radiolarian shale. The major manganese ore minerals are pyrolusite, braunite, bixbyite, ramsdellite, and romanechite showing replacement, colloidal, and brecciated textures. The high mean values of Mn/Fe (15.32) and Si/Al (15.65), and the low mean concentration values of trace elements, such as Cu (85.9 ppm), Ni (249.9 ppm), and Zn (149 ppm), as well as the high concentration values of Si, Fe, Mn, Ba, Zn, Sr, and As in the studied manganese ores furnished sufficient evidence to postulate that the sea-floor Mn-rich hydrothermal exhalatives were chiefly responsible for the ore formation, and the hydrogenous processes had negligible role in generation of the ores. The further geological and geochemical evidence also revealed that the ores deposited on the upper parts of the ophiolitic sequence by submarine exhalatives. The intense hydrothermal activities caused leaching of elements such as Mn, Fe, Si, Ba, As and Sr from the basaltic lavas (spilites). After debouching of the sea-floor exhalatives, these elements entered the sedimentary basin. The redox conditions were responsible for separation of Fe from Mn.

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Genesis of the Nasirabad manganese occurrence, Fars province, Iran: Geochemical evidences

Cited by 24 publications

References 51 publications

Geochemical evidence for the genesis of the Sarical-Yavu hematite mineralizations (Sivas, Central Turkey)

Geochemical evidence for the genesis of the Sarical-Yavu hematite mineralizations (Sivas, Central Turkey)

Rare-earth element distribution and genesis of manganese ores associated with Tethyan ophiolites, Iran: A review

Geological and Geochemical Investigation of Three Ophiolite‐Hosted Manganese Prospects, Southeast of Birjand, South Khorasan, East of Iran

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