The behavior of rare-earth elements, zirconium and hafnium during magma evolution and their application in determining mineralized magmatic suites in subduction zones: Constraints from the Cenozoic belts of Iran

Jamali, Hemayat

doi:10.1016/j.oregeorev.2016.10.006

Cited by 20 publications

(6 citation statements)

References 37 publications

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“…Relative metal abundance in magmas is a function of compositional evolution, fractionation, water content, and oxidation states, which are controlled by mineralogy and the depth of the magma source, geodynamic setting, and tectonomagmatic conditions (Jamali, ). Previous studies have proven that oxygen fugacity has an important influence on the formation of porphyry Cu deposits (Sun et al, , ; Zhang et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Overall, hydrous minerals, such as amphibole and biotite, are absent in these porphyries. In addition, the common occurrence of plagioclase (perthite or albite) as phenocrysts indicates that the water content of these porphyries is low (Jamali, ). Ore minerals are mainly reduced sulfides (e.g.…”

Section: Characteristics Of Porphyry Cu Deposits In the Western Awulamentioning

confidence: 99%

“…Compositional evolution, fractionation, water content, and oxidation states influence the relative metal abundance in magmas (Jamali, ). For example, porphyry Cu–Au deposits are associated with oxidized, relatively unevolved magmas (Blevin, ).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the melt with low H 2 O content has high Zr and Hf concentration. Due to these reasons, REEs, Zr, and Hf have been used to indicate the degree of evolution, water content, and oxidation states of parental magmas of igneous rocks that are associated with porphyry deposits in Iran (Jamali, ).…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Rare Earth Elements, Zr, and Hf in Ore‐Bearing Porphyries from the Western Awulale Metallogenic Belt, Northwestern China and their Application in Determining Metal Fertility of Granitic Magma

Chen

2018

Resource Geology

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The western Awulale metallogenic belt in northwestern China hosts a number of small-to medium-sized porphyry Cu deposits that are associated with albite porphyry. The common presence of plagioclase (albite) as phenocrysts and the absence of hydrous minerals (amphibole and biotite) indicate that the water content of albite porphyry is low. Trace-element compositions of whole rocks and zircon grains from these orebearing porphyries were measured. Zircon grains from albite porphyries exhibit Ce 4+ /Ce 3+ ratios ranging from 7.75 to 95.1, which indicate that these porphyries have a low oxygen fugacity. Trace element compositions of ore-bearing porphyries exhibit (La/Yb) N ratios ranging from 1.09 to 11.1 and Eu/Eu * ratios ranging from 0.10 to 0.66. These ore-bearing porphyries have Zr values ranging from 171 to 707 ppm and Hf values ranging from 8.30 to 18.9 ppm. Combining these porphyries with other ore-bearing porphyries that formed in the Central Asian Orogenic Belt (CAOB) and the Pacific Rim metallogenic belt, we found that the (La/Yb) N and Eu/Eu * ratios of ore-bearing porphyries in western Awulale are low, while the Zr and Hf values are high. Specifically, REEs can be used to evaluate the degree of differentiation and degree of partial melting, and Zr and Hf can be used to evaluate the redox conditions and water content of magmatic rocks. Our findings indicate that ore-bearing porphyries in western Awulale have a lower oxygen fugacity, degree of differentiation, and water content than do others in the CAOB and the Pacific Rim metallogenic belt. Compared to those of ore-bearing porphyries with lower zircon Ce 4+ /Ce 3+ ratios, the (La/Yb) N ratios of orebearing porphyries in our study are low, and the Zr and Hf values are high. This finding indicates that, under reducing conditions, the degree of evolution and water content may have an important influence on the metal abundance in magmas. There is also a clear relationship between (La/Yb) N , Eu/Eu * , Zr, Hf, and the size of the deposits. Large-(>4 Mt Cu) and intermediate (1.5-4 Mt Cu)-sized porphyry Cu deposits are associated with granitic intrusions that have higher (La/Yb) N and Eu/Eu * ratios and lower Zr and Hf values. This finding indicates that, in addition to oxygen fugacity, the degree of evolution and water content are controlling parameters for metal abundance in magmas, especially in low oxygen fugacity porphyry Cu

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Section: Discussionmentioning

confidence: 99%

Section: Characteristics Of Porphyry Cu Deposits In the Western Awulamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristics of Rare Earth Elements, Zr, and Hf in Ore‐Bearing Porphyries from the Western Awulale Metallogenic Belt, Northwestern China and their Application in Determining Metal Fertility of Granitic Magma

Chen

2018

Resource Geology

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“…This high LIL/HFS pattern is now recognized as a distinctive feature of subduction-related magmas and signature of crustal contamination in the volcanic arcs of continental active margins (Gill, 1981;Pearce, 1983;Rollinson, 1993;Thirlwall et al, 1994;Wilson, 1989;Winter, 2001). Geochemical data such as Nb depletion (Taylor and McLennan, 1985;Hofmann, 1997), a distinct enrichment of Rb, Ba, K, Th, La, and Ce (Jamali, 2017) along with the Sr-Nd isotopic composition (Jung, 1999) demonstrate the important role of crustal assimilation during the magmatic evolution of the Hamech intermediate intrusions unlike the mafic rocks.…”

Section: Magma Source 511 Ree Geochemistrymentioning

confidence: 99%

U-Pb zircon geochronology, geochemistry, and petrogenesis of the Hamech intrusions in the Kuh-e-Shah volcano-plutonic complex, Eastern Iran

Etemadi¹,

Karimpour²,

Shafaroudi³

et al. 2018

Turkish J Earth Sci

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Introduction The tectonic unit of eastern Iran, namely the Lut Block and the Flysch Zone, represent a complex tectonic history related to the evolution of the Sistan Ocean. The Lut Block, as the main body of eastern Iran, confined by faults, extends for about 900 km in the N-S direction (Stocklin and Nabavi, 1973) and only 200 km wide in the E-W direction. The Lut Block is composed of volcanic, volcaniclastic, subvolcanic, and intrusive rocks. The geological history of the Lut Block is characterized by magmatic activities from Middle Jurassic (the S-type Shah-Kuh granitoids; 165-162 Ma) to Cenozoic oceanic island basalts (15.5-1.74 Ma); thus, igneous rocks cover over half of this zone with up to 2000-m thickness (Karimpour et al., 2011). Meanwhile, Tertiary period (42-33 Ma) has a special importance in terms of magmatism and mineralization (Karimpour et al.

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Implications for Mineral Exploration in Arc Environments

Müller¹,

Groves

2018

Potassic Igneous Rocks and Associated Gold-Copper Mineralization

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The behavior of rare-earth elements, zirconium and hafnium during magma evolution and their application in determining mineralized magmatic suites in subduction zones: Constraints from the Cenozoic belts of Iran

Cited by 20 publications

References 37 publications

Characteristics of Rare Earth Elements, Zr, and Hf in Ore‐Bearing Porphyries from the Western Awulale Metallogenic Belt, Northwestern China and their Application in Determining Metal Fertility of Granitic Magma

Characteristics of Rare Earth Elements, Zr, and Hf in Ore‐Bearing Porphyries from the Western Awulale Metallogenic Belt, Northwestern China and their Application in Determining Metal Fertility of Granitic Magma

U-Pb zircon geochronology, geochemistry, and petrogenesis of the Hamech intrusions in the Kuh-e-Shah volcano-plutonic complex, Eastern Iran

Implications for Mineral Exploration in Arc Environments

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