Extreme Fractionation and Deformation of the Leucogranite - Pegmatite Suite at Red Cross Lake, Manitoba, Canada. Iv. Mineralogy

Černý, Petr; Teertstra, David K.; Chapman, Ron; Selway, Julie B.; Hawthorne, Frank C.; Ferreira, Karen; Chackowsky, Leonard E.; Xianjue, Wang; Meintzer, Robert E.

doi:10.3749/canmin.50.6.1839

Cited by 35 publications

(6 citation statements)

References 44 publications

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“…As zircon in the highly fractionated granites usually is the late‐stage mineral, there are several inherited zircons occurring in the highly fractionated granites. In addition, the neogenic zircon in the highly fractionated granites almost has high Hf and P content (up to 10 wt.%) (Huang et al, ; Chudík et al, ; Wang et al, ; Cerny et al, ). At the same time, the Zr/Hf ratios for whole rocks and zircons are low (Bau, ; Breiter et al, ; Deering et al, ).…”

Section: Discussionmentioning

confidence: 99%

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%

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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“…Wodginite and other WGM occur as accessory minerals in rare-metal lithium-mica pegmatites of the Li-Cs-Ta geochemical type (LCT pegmatites) [29,73]. Given the important role of fluorine in rare-metal pegmatite mineralization [29,30,69], parent rocks with WGM can be called lithium-fluoric pegmatites. Intrusive and exocontact bodies of pegmatites at deposits such as Wodgina (Australia), Bernic Lake (Canada), Koktogai (China), Bikita (Zimbabwe), Varuträsk (Sweden), Vishnyakovskoe (Russia) and others are located on crystalline shields, in Caledonian and Hercynian folded structures and have Precambrian or Paleozoic age [1,4,7].…”

Section: Minerals Of the Wodginite Groupindicators Of Tantalum-bearin...mentioning

confidence: 99%

“…Like the accompanying tantalum-niobates, WGM contain impurities of Zr and Hf, that due to the reduction of volumes of crystallizing zircon in rare-metal magma, saturated by F, B, P, H2O, enter into isomorphic relations with Sn, Ta, Ti, Fe 3+ . At the late-magmatic stage of crystallization, wodginite of pegmatites becomes the main carrier of Zr and Hf: ZrO2 0.35 (2.28) %, HfO2 0.05 (0.92) % [26,29,30]; and even more so ferrowodginite of pegmatites: ZrO2 0.61 (5.98) %, HfO2 0.08 (1.59) % [33,40] (see Table 1). The formula coefficient of zirconium in position B is 0.02-0.03 (see Table 3).…”

Section: Chemical Composition Of Minerals Of the Wodginite Group In P...mentioning

confidence: 99%

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Wodginite as an indicator mineral of tantalum-bearing pegmatites and granites

Alekseev

2023

PMI

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In the composition of tantalum-niobates the tin-bearing wodginite group minerals (WGM) were found: wod-ginite, titanowodginite, ferrowodginite, ferrotitanowodginite, lithiowodginite, tantalowodginite, “wolframowodginite”. We reviewed the worldwide research on WGM and created a database of 698 analyses from 55 sources including the author's data. WGM are associated with Li-F pegmatites and Li-F granites. Wodginite is the most prevalent mineral, occurring in 86.6 % of pegmatites and 78.3 % of granites. The occurrence of WGM in granites and pegmatites differs. For instance, titanowodginite and “wolframowodginite” occur three times more frequently in granites than in pegmatites, whereas lithiowodginite and tantalowodginite do not appear in granites at all. The difference between WGM in granites and pegmatites is in finer grain size, higher content of Sn, Nb, Ti, W, and Sc; lower content of Fe3+, Ta, Zr, Hf; higher ratio of Mn/(Mn + Fe); and lower ratio of Zr/Hf. The evolutionary series of WGM in pegmatites are as follows: ferrowodginite → ferrotitanowodginite → titanowodginite → “wolframowodginite” → wodginite → tantalowodginite; in granites: ferrowodginite → ferrotitanowodginite → “wolframowodginite” → wodginite → titanowodginite. WGM can serve as indicators of tantalum-bearing pegmatites and granites. In Russia the promising sources of tantalum are deposits of the Far Eastern belt of Li-F granites containing wodginite.

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“…The TMG and DBG both belong to moderately evolved granites. Furthermore, highly fractionated granites are characteristically enriched in P and Hf in zircon [17,83,84], and the TMG has higher P and Hf values in zircon than DBG. On the Zr/Hf vs. P diagram for zircon, P values typically increase with decreasing Zr/Hf ratios (Figure 10d), and the TMG has a more obviously fractionated trend compared with Daheyan granodiorite.…”

Section: Fractional Crystallization Of Magmasmentioning

confidence: 99%

Using Whole Rock and Zircon Geochemistry to Assess Porphyry Copper Potential of the Tonggou Copper Deposit, Eastern Tianshan

et al. 2020

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Eastern Tianshan hosts a number of porphyry Cu deposits. However, these mainly formed in the Jueluotage Belt, in the middle part of Eastern Tianshan. The Tonggou porphyry Cu mineralization is an exception to this, since it is located in the Bogda Orogenic Belt, north of Eastern Tianshan. We obtained new zircon U–Pb ages, whole-rock geochemical data, zircon Hf isotope data, and zircon trace element compositions. LA-ICP-MS zircon U–Pb dating indicates a crystallization age of 302.2–303.0 Ma for the Tonggou mineralized granodiorite (TMG), which suggests that the Tonggou porphyry Cu mineralization formed in the Late Carboniferous period. εHf (t) data (1.8–14.1) for TMG suggests it was sourced from juvenile crustal melts, mixed with some mantle materials. TMG displays low ΣREE, compatible elements (Ba, Sr, Zr, and Hf), Zr/Hf and Nb/Ta ratios, as well as clearly negative Eu anomalies in whole rocks analyses. In addition, TMG is enriched in P, Hf and Th/U ratios in zircon, and has lower crystallization temperatures (734 to 735 °C) than the Daheyan barren granodiorite (DBG) (753 to 802 °C). Whole rock and zircon geochemical analyses show that the TMG was formed by fractional crystallization to a greater extent than the DBG in the Bogda Orogenic Belt. Moreover, zircon grains of the TMG show high Ce4+/Ce3+ ratios (159–286), which are consistent with related values from large porphyry deposits of the Central Asian Orogenic Belt (CAOB). High Ce4+/Ce3+ ratios reflect oxidizing magmas as a result of fractional crystallization, which indicates that the Tonggou deposit has potential to host a large porphyry Cu deposit.

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Extreme Fractionation and Deformation of the Leucogranite - Pegmatite Suite at Red Cross Lake, Manitoba, Canada. Iv. Mineralogy

Cited by 35 publications

References 44 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

Wodginite as an indicator mineral of tantalum-bearing pegmatites and granites

Using Whole Rock and Zircon Geochemistry to Assess Porphyry Copper Potential of the Tonggou Copper Deposit, Eastern Tianshan

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