Using apatite to discriminate synchronous ore-associated and barren granitoid rocks: A case study from the Edong metallogenic district, South China

Duan, Deng-Fei; Jiang, Shao‐Yong

doi:10.1016/j.lithos.2018.04.022

Cited by 37 publications

(5 citation statements)

References 57 publications

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“…Li concentrations in natural minerals (plagioclase, quartz, sanidine, pyroxene, amphibole, apatite, titanite, zircon) grown from rhyolitic and granitic melts are typically less than 50 ppm (Berlo et al, 2004;Bachmann et al, 2005;Kent et al, 2007;Cabato et al, 2013;Forni et al, 2016, Forni et al, 2018Rubin et al, 2017;Duan and Jiang, 2018;Ellis et al, 2018;Neukampf et al, 2019;Neukampf et al, 2022;Neukampf et al, 2023;Friedrich et al, 2020;Li et al, 2022). Yet, Li concentrations up to 120 ppm can be found in biotites and zircons from rhyolitic magmas (Forni et al, 2016;Forni et al, 2018;Ellis et al, 2022a), which then represent the Li-richest minerals in felsic volcanic rocks.…”

Section: Mineral Concentrationsmentioning

confidence: 99%

Lithium in felsic magmas: a volcanological perspective

Dupont de Dinechin,

Balcone-Boissard,

Martel

et al. 2023

Front. Earth Sci.

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Volcanic eruptions are unpredictable phenomena that pose a challenge to crisis management, owing to the fact that contrasted eruptive styles (explosive versus effusive) exhibited at the surface depend on unobservable deep processes occurring in the reservoir and the volcanic conduit. Constricting the behaviour of magma during ascent, and the degassing in particular, allows for a clearer understanding of the relationships between petrological and volcano monitoring signals, and hence a better description of the volcanic hazard. To this aim, lithium (Li) has been used to track magmatic and post-eruptive processes, as a geospeedometer for processes operating on short time scales due to its high mobility in silicate melts and crystals. Yet, the accurate use of Li to assess syn- and post-eruptive processes still lack complete dataset. We propose a review of our current knowledge on Li behavior, with an emphasis on felsic (andesitic to rhyolitic) magmas whose explosive behavior during volcanic eruptions is still poorly understood. We present current knowledge regarding the Li concentration and isotopic compositions, intracrystalline diffusion, and crystal-melt-fluid partition coefficients discovered in felsic magmas and primary crystals. We describe difficulties in interpreting Li data to investigate the differentiation, degassing, ascent rate, volatile fluxing, and cooling of magmas. Finally, we suggest future directions for expanding our understanding of Li behavior.

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Section: Mineral Concentrationsmentioning

confidence: 99%

Lithium in felsic magmas: a volcanological perspective

Dupont de Dinechin,

Balcone-Boissard,

Martel

et al. 2023

Front. Earth Sci.

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“…For instance, accessory apatite has been used to identify the magma fertility of subvolcanic intrusions and their potential to host porphyry-skarn deposits (Mao et al 2016;Gao et al 2020;Yang et al 2020;Cao et al 2021;Chen et al 2021;Liu et al 2021). Apatite also occurs in a wide range of mineral deposits, including iron oxide apatite (IOA) deposits and carbonatites, where it can host economic levels of REE, and where its textures and chemical signatures have been used to investigate magmatic versus hydrothermal processes (Hofstra et al 2016;Broom-Fendley et al 2017;Duan and Jiang 2018;Andersson et al 2019;La Cruz et al 2019;Palma et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of apatite-fluid interaction and partitioning of rare earth elements at 150 and 250 °C

Chappell

Gysi

Monecke

et al. 2023

American Mineralogist

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Apatite is a common accessory phase in igneous and metamorphic rocks. Its stability in magmatic-hydrothermal and hydrothermal systems is known to be a key control on the mobility of rare earth elements (REE). To better constrain how apatite is altered during fluid-rock interaction at comparably low temperatures, batch-type apatite dissolution experiments were conducted at 150 and 250 °C at saturated water vapor pressure in acidic to mildly acidic (pH of 2-4) aqueous fluids having variable salinities (0, 0.5, and 5 wt% NaCl). The study reveals the dominance of apatite dissolution textures with the formation of micron-scale etch pits and dissolution channels developing prominently along the c-axis of the apatite crystals.Backscattered electron imaging shows an increase in apatite dissolution with increased temperature and when reacting the crystals with more acidic and higher salinity starting fluids. This study also demonstrates an increase in dissolved REE in the experimental fluids corroborating with the observed apatite dissolution behavior. Backscattered electron imaging of secondary minerals formed during apatite dissolution and scanning electron microscopy-based energy dispersive spectrometer peaks for Ca, P, and REE support the formation of monazite-(Ce) and minor secondary apatite as deduced from fluid chemistry (i.e., dissolved P and REE concentrations). The studied apatite reaction textures and chemistry of the reacted fluids both indicate that the mobility of REE is controlled by the dissolution of apatite coupled with precipitation of monazite-(Ce), which are enhanced by the addition of NaCl in the starting fluids.This coupled process can be traced by comparing the REE to P ratios in the reacted fluids with the stoichiometry of the unreacted apatite crystals. Apatite metasomatized at temperatures <300 °C is therefore controlled by dissolution rather than dissolution-reprecipitation reactions commonly observed in previous experiments conducted above 300 °C. Further, this study This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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“…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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Using apatite to discriminate synchronous ore-associated and barren granitoid rocks: A case study from the Edong metallogenic district, South China

Cited by 37 publications

References 57 publications

Lithium in felsic magmas: a volcanological perspective

Lithium in felsic magmas: a volcanological perspective

Experimental study of apatite-fluid interaction and partitioning of rare earth elements at 150 and 250 °C

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)

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