Apatite as a magma redox indicator and its application in metallogenic research

Wang, Hairuo; Cai, Keda; Sun, Min; Xia, Xiaoping; Lai, Chun‐Kit; Li, Pengfei; Wan, Bo; Zhang, Zhiyong

doi:10.1016/j.lithos.2022.106749

Cited by 7 publications

(7 citation statements)

References 72 publications

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“…Using the method of Piccoli and Candela [74], the estimated apatite saturation temperature (956 • C; Supplementary Table S4) was attained based on the whole-rock data. Such a high temperature suggests that apatite in the DGS quartz monzodiorite is an early crystallized mineral phase [75]. Moreover, the analyzed apatites are generally ~100-300 µm in length, much larger than the euhedral and fine-grained ones (25 µm) crystallizing from the intercumulus melt but cannot record bulk magma information [76,77].…”

Section: Petrogenesis Of the Dgs Quartz Monzodioritementioning

confidence: 99%

“…D oxygen fugacity is favorable for the liberation of Cu when and during the enrichment in Cu in the melt during differ into an exsolved fluids phase [110,[114][115][116]. As apatite is an early-stage crystallization product, it ca idation states of the host magma [75][76][77]117]. The Mn conce determine the redox conditions of granitic magmas due to The association between Cu deposits and adakitic intrusions in subduction zones suggests that magma oxygen fugacity controls the partitioning and transport of Cu in magmas before mineralization [81,[110][111][112][113].…”

Section: Metallogenic Implications For the Cretaceous Adakites In The...mentioning

confidence: 99%

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Geochronology and Geochemistry of Cretaceous Adakitic Rocks of the Dongguashan Cu Deposit in the Lower Yangtze River Belt: Insights into Petrogenesis and Mineralization

et al. 2023

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The Lower Yangtze River Belt (LYRB) is a well-known and important base area with regard to Cu polymetallic resources in China. Large Cu polymetallic deposits in the LYRB are strongly associated with Cretaceous adakitic rocks. However, the petrogenesis of the Early Cretaceous adakites and the temporal–genetic relationship with mineralization are still disputable. The Dongguashan (DGS) Cu polymetallic deposit in the Tongling ore cluster is one of the largest Cu deposits in the LYRB. The DGS intrusion mainly comprises quartz monzodiorite, with SiO2 contents varying from 63.7 to 67.9 wt%. Zircons from the quartz monzonite yield a SIMS U-Pb age of 138.9 ± 1.8 Ma, which indicates that the Cretaceous magmatism is coeval with mineralization. The studied rocks show typical geochemical signatures of adakites, characterized by high Al2O3 (14.9–16.2 wt%) and Sr (800–910 ppm) and low Y (15.2–17.5 ppm) and Yb (1.37–1.52 ppm) contents, with consequently high Sr/Y (46–61) and (La/Yb)N (14.8–18.5) ratios. The zircon δ18O values of the DGS adakites range from 5.7‰ to 7.3‰, indicating a heterogeneous source. Whole-rock Sr-Nd isotopic compositions show an enriched character, with ISr ratios from 0.70783 to 0.70794 and εNd(t) values around −11.0, which fall intermediately in the area of MORB (mid-ocean ridge basalt), marine sediment, and the ancient lower crust. Comprehensively, whole-rock geochemical compositions and isotopic values suggest that the adakites are generated from the partial melting of the subducted oceanic crust and possibly with the involvement of sedimentary materials derived from the slab or continental crust. Moreover, the bulk-rock high-Cu composition, and the physical–chemical conditions (high oxygen fugacity and high volatile contents) revealed by apatites, plays critical roles in the formation of Cu mineralization in the DGS Tongling ore cluster, LYRB.

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Section: Petrogenesis Of the Dgs Quartz Monzodioritementioning

confidence: 99%

Section: Metallogenic Implications For the Cretaceous Adakites In The...mentioning

confidence: 99%

Geochronology and Geochemistry of Cretaceous Adakitic Rocks of the Dongguashan Cu Deposit in the Lower Yangtze River Belt: Insights into Petrogenesis and Mineralization

et al. 2023

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“…A good number of studies have concluded that apatite is a key mineral in magmatichydrothermal systems to record their crystallization history and to reflect the melt composition and oxidation conditions [2,4,[6][7][8]10,11,15,17,21,124,132,153]. Moreover, compositional variations of apatite may help to determine the economic potential and fertility index in different ore deposit environments, including granitoids (e.g., [7,10,134]); pegmatites, (e.g., [10,16,49,154,155]); carbonatites (e.g., [10,23]); skarns (e.g., [11]); Sn, W and Mo deposits (e.g., [6,11]); Cu-porphyry [156,157]; and Au-epithermal deposits [26] among others.…”

Section: Apatite As Archive Of Processes In Granitic and Pegmatitic S...mentioning

confidence: 99%

“…Therefore, a detailed study of the chemical composition of apatite in igneous environments may give valuable information on the crystallization conditions of its host rocks. Likewise, it may constitute a powerful mineral exploration tool in the case of ore deposits related to igneous rocks (e.g., [10,11,[22][23][24][25][26]).…”

Section: Introductionmentioning

confidence: 99%

Compositional Variations in Apatite and Petrogenetic Significance: Examples from Peraluminous Granites and Related Pegmatites and Hydrothermal Veins from the Central Iberian Zone (Spain and Portugal)

et al. 2022

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Apatite can be used as an archive of processes occurring during the evolution of granitic magmas and as a pegmatite exploration tool. With this aim, a detailed compositional study of apatite was performed on different Variscan granites, pegmatites and quartz veins from the Central Iberian Zone. Manganese in granitic apatite increases with increasing evolution degree. Such Mn increase would not be related to changes in the fO2 during evolution but rather to a higher proportion of Mn in residual melts, joined to an increase in SiO2 content and peraluminosity. In the case of pegmatitic apatite, the fO2 and the polymerization degree of the melts seem not to have influenced the Mn and Fe contents but the higher availability of these transition elements and/or the lack of minerals competing for them. The subrounded Fe-Mn phosphate nodules, where apatite often occurs in P-rich pegmatites and P-rich quartz dykes, probably crystallized from a P-rich melt exsolved from the pegmatitic melt and where Fe, Mn and Cl would partition. The low Mn and Fe contents in the apatite from the quartz veins may be attributed either to the low availability of these elements in the late hydrothermal fluids derived from the granitic and pegmatitic melts, or to a high fO2. The Rare Earth Elements, Sr and Y are the main trace elements of the studied apatites. The REE contents of apatite decrease with the evolution of their hosting rocks. The REE patterns show in general strong tetrad effects that are probably not related to the fluids’ activity in the system. On the contrary, the fluids likely drive the non-CHARAC behavior of apatite from the most evolved granitic and pegmatitic units. Low fO2 conditions seem to be related to strong Eu anomalies observed for most of the apatites associated with different granitic units, barren and P-rich pegmatites. The positive Eu anomalies in some apatites from leucogranites and Li-rich pegmatites could reflect their early character, prior to the crystallization of feldspars. The increase in the Sr content in apatite from Li-rich pegmatites and B-P±F-rich leucogranites could be related to problems in accommodating this element in the albite structure, favoring its incorporation into apatite. The triangular plots ΣREE-Sr-Y and U–Th–Pb of apatites, as well as the Eu anomaly versus the TE1,3 diagram, seem to be potentially good as petrogenetic indicators, mainly for pegmatites and, to a lesser extent, for granites from the CIZ.

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“…In terms of the ore-fluid origin, some authors proposed a formation water source (Zhou et al, 2014;, whereas some others preferred a deeper origin (Wei et al, 2017;Wu et al, 2021). Hydrothermal apatite, a resistate accessory mineral suitable for geochemical and geochronological analyses (Hassan et al, 1977;Kordian et al, 2020;Wang et al, 2022), could provide new clues for the fluid source(s) and evolution (McClellan and Van Kauwenbergh, 1990;Ayers and Watson, 1993;Prokopyev et al, 2017;Hu et al, 2019). In recent years, in situ microanalysis on accessory minerals (incl.…”

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confidence: 99%

Hydrothermal fluid characteristics of the huayuan Pb-Zn orefield: Constraints from apatite major and trace element compositions

et al. 2023

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The Huayuan orefield in the SW Yangtze Block (SW China) is a world-class Pb-Zn orefield, with over 20 million tonnes (Mt) metal reserve. However, the Pb-Zn ore fluid source and evolution in Huayuan remain controversial. This study determined the major and trace element compositions of the newly-identified apatite from the Pb-Zn ores, using electron microprobe analysis (EMPA) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The apatite samples are of hydrothermal origin, and have high CaO (52.57–57.15 wt%), P2O5 (39.26–42.88 wt%) and F (1.82–3.90 wt%) but low Cl (< 0.42 wt%) contents. The samples have total rare Earth element content (ΣREE) of 74.07–1,255.34 ppm, and they all show negative Eu and weakly positive Ce anomalies. The result suggests that the apatite was formed in an environment with decreasing oxygen fugacity, and in relatively F-rich, Cl-poor, and REE-poor ore-forming fluid. We geochemically compared the apatite from Huayuan with those from different geneses by Fisher discriminant. The result suggests that the Huayuan apatite is distinct from typical magmatic and purely hydrothermal apatite, and that the ore-forming fluids may have had multiple sources. The mixing of fluids with different origins may have triggered significant metal ore deposition.

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Apatite as a magma redox indicator and its application in metallogenic research

Cited by 7 publications

References 72 publications

Geochronology and Geochemistry of Cretaceous Adakitic Rocks of the Dongguashan Cu Deposit in the Lower Yangtze River Belt: Insights into Petrogenesis and Mineralization

Geochronology and Geochemistry of Cretaceous Adakitic Rocks of the Dongguashan Cu Deposit in the Lower Yangtze River Belt: Insights into Petrogenesis and Mineralization

Compositional Variations in Apatite and Petrogenetic Significance: Examples from Peraluminous Granites and Related Pegmatites and Hydrothermal Veins from the Central Iberian Zone (Spain and Portugal)

Hydrothermal fluid characteristics of the huayuan Pb-Zn orefield: Constraints from apatite major and trace element compositions

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