Extreme Fractionation and Deformation of the Leucogranite - Pegmatite Suite at Red Cross Lake, Manitoba, Canada. I. Geological Setting

Černý, Petr; Corkery, M. Timothy; Halden, Norman M.; Ferreira, Karen; Brisbin, W. C.; Chackowsky, Leonard E.; Meintzer, Robert E.; Longstaffe, Fred J.; Trueman, David L.

doi:10.3749/canmin.50.6.1793

Cited by 10 publications

(1 citation statement)

References 20 publications

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“…[65,82,83]. Many researchers have reported the existence of P-rich or Hf-rich zircons in highly differentiated granites, which is widely regarded as one of the vital indicators of a high degree of magma differentiation [84,85]. Breiter et al (2006) [86] believed that there are two main reasons for the enrichment of P and Hf in zircon: (1) zircon has undergone a long fractional crystallization process, resulting in late crystallization from P-rich or F-rich melts; (2) the interaction between zircons and P-rich or F-rich hydrothermal fluids in the late magmatic period leads to further enrichment.…”

Section: Properties and Sources Of Ore-forming Fluidsmentioning

confidence: 99%

Geochronology and Geochemistry of the Xianghualing Granitic Rocks: Insights into Multi-Stage Sn-Polymetallic Mineralization in South China

Li¹,

Wu²,

Sun³

et al. 2022

Minerals

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Multi-stage magmatic events associated with large tungsten-tin polymetallic deposits in the Nanling Range have been the subject of extensive research spanning many years. In this paper we report the results of a systematic study of the petrology, whole-rock geochemistry, zircon U-Pb chronology, and trace element geochemistry of granite bodies exposed in the Xianghualing ore field. They show that the granites in the study area are characterized by high SiO2 (63.83%–75.29%), Al2O3 (13.12%–18.87%), Rb (565–3260 ppm), Nd (67.3–113.5 ppm) and Ta (23.2–129.0 ppm) and by low MgO (0.02%–0.22%), TiO2 (0%–0.02%), Sr (5.3–80.5 ppm) and Ba (7.9–66.4 ppm). The rocks are highly differentiated A-type peraluminous granite, which originated in an extensional within-plate tectonic setting. Based on U-Pb dating and trace element analysis, the following multi-stage magma-hydrothermal events were identified: (1) Paleozoic (~347 Ma) and Triassic (~206 Ma) magmatic stages (initial enrichment epochs of ore-forming elements), (2) Jurassic (~161 Ma) magmatic-hydrothermal stage (mineralization epoch), and (3) Cretaceous hydrothermal overprinting stage (with peaks in the Early Cretaceous ~120 Ma and Late Cretaceous ~80 Ma). From an economic point of view, the Late Cretaceous appears to have great potential for tungsten-tin mineralization. Zircon trace element geochemistry indicates that the ore-forming fluids related to tin mineralization in the Cretaceous originated from the crust and underwent highly differentiated evolutionary processes under relatively reducing conditions. This paper emphasizes the Cretaceous tungsten-tin metallogenic events in the Nanling Range and provides an essential basis and new ideas for further tin-tungsten exploration.

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Section: Properties and Sources Of Ore-forming Fluidsmentioning

confidence: 99%

Geochronology and Geochemistry of the Xianghualing Granitic Rocks: Insights into Multi-Stage Sn-Polymetallic Mineralization in South China

Li¹,

Wu²,

Sun³

et al. 2022

Minerals

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Alkali metal and rare earth element evolution of rock-forming minerals from the Gatumba area pegmatites (Rwanda): Quantitative assessment of crystal-melt fractionation in the regional zonation of pegmatite groups

Hulsbosch

Hertogen

Dewaele

et al. 2014

Geochimica et Cosmochimica Acta

156

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A new model for the granite–pegmatite genetic relationships in the Kaluan–Azubai–Qiongkuer pegmatite-related ore fields, the Chinese Altay

Zhang

et al. 2016

Journal of Asian Earth Sciences

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Pegmatites commonly form in the waning stage of magma evolution by fractional crystallization of volatile-rich magmas and may be important host rocks of strategic metals (e.g., Li, Be, Cs, Ta, and Nb) and high-quality gem minerals. This study reports new zircon U-Pb dating results and Hf isotopic compositions of the KLA803 pegmatite, the AZB-01 pegmatite, the JMK-09 pegmatite (abbreviated as the K-A-J pegmatites) and the Halong granite from the Chinese Altay to determine the potential petrogenetic relationships between them. The geochronological data document that the K-A-J pegmatites were emplaced at 224.6 ± 2.3 Ma, 191.6 ± 2.0 Ma and 192.0 ± 2.3 Ma, respectively, and they are characterized by negative to low positive εHf(t) values (from-1.0 to +6.3) and old model ages (T DM) (with the T DM1 from 874 to 597 Ma and T DM2 from 1,298 to 833 Ma). In contrast, the Halong granite has an emplacement age of 398.3 ± 2.4 Ma and is characterized by higher positive εHf(t) values (from +9.9 to +15.2) and younger model ages (T DM) (with the T DM1 from 626 to 414 Ma and T DM2 from 760 to 423 Ma). They all have intruded into the Kulumuti group stratum, which has negative initial εNd(t) values (from-4.3 to-0.2) and old T DM model ages (between 1.22 and 1.56 Ga). Based on the calculated results of the mixing ratios (f) of the initial magmas and the prevailing Paleozoic tectonic framework of the Chinese Altay, we establish two petrogenetic models for the K-A-J pegmatites: Model 1 refers to that these pegmatites originated from a mixed magma that was composed of 72 wt.% to 91 wt.% depleted mantle components and 9 wt.% to 28 wt.% lower crust components; and Model 2 refers to that they were derived from the partial melting of 38 wt.% to 83 wt.% Halong granite and 17 wt.% to 62 wt.% sedimentary rocks from the Kulumuti group. We also suggest that the initial magma of the Halong granite was significantly contributed by juvenile materials with a slight involvement of crustal materials. In Model 1, because LCT-type pegmatites (classified as Li-Cs-Ta enriched pegmatites associated with S-type granite that was produced by the partial melting of preexisting sedimentary rocks) have close geochemical affinities with crustal materials, the excessively high weight percentages (72 wt.% to 91 wt.%) of the depleted mantle components in the initial magma of the K-A-J pegmatites indicate that this model is unrealistic. Therefore, we consider that Model 2 is more reasonable at present for interpreting the petrogenesis of the K-A-J pegmatites, and it needs to be verified in other pegmatite fields of the Chinese Altay.

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Extreme Fractionation and Deformation of the Leucogranite - Pegmatite Suite at Red Cross Lake, Manitoba, Canada. I. Geological Setting

Cited by 10 publications

References 20 publications

Geochronology and Geochemistry of the Xianghualing Granitic Rocks: Insights into Multi-Stage Sn-Polymetallic Mineralization in South China

Geochronology and Geochemistry of the Xianghualing Granitic Rocks: Insights into Multi-Stage Sn-Polymetallic Mineralization in South China

Alkali metal and rare earth element evolution of rock-forming minerals from the Gatumba area pegmatites (Rwanda): Quantitative assessment of crystal-melt fractionation in the regional zonation of pegmatite groups

A new model for the granite–pegmatite genetic relationships in the Kaluan–Azubai–Qiongkuer pegmatite-related ore fields, the Chinese Altay

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