Melt Inclusions in Zircon

Thomas, J. B.; Bodnar, Robert J.; Shimizu, Nobumichi; Chesner, Craig A.

doi:10.2113/0530063

Cited by 63 publications

(36 citation statements)

References 99 publications

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“…The high LREE concentrations of this type of zircon were not attributed to the theoretical partition coefficients of LREE between zircon and melt (Thomas et al 2002;Hanchar and Westrenen 2007), instead they are considered to be the result of LREE-rich inclusions in zircon or dramatically different behavior of LREE in highly evolved magmatic systems (Bakker and Elburg 2006). Generally, zircon from highly evolved granitic rocks is commonly porous and may contain U, Th, Nb, and Tarich inclusions when the host rocks experienced mineralization or alteration (Thomas et al 2003;Tomaschek et al 2003;Geisler et al 2007;Martin et al 2008;Hay and Dempster 2009;Van Lichtervelde et al 2009). However, the time-resolved LA-ICPMS spectra and element distribution maps (Electronic Supplementary Material Fig.…”

Section: Distinct Ree Compositions Of Magmatic and Hydrothermal Zirconmentioning

confidence: 97%

“…The non-formula elements, especially LREE and Ti, could either occur as inclusions or substitute into the lattice of the hydrothermal zircon (Thomas et al 2003;Geisler et al 2007). Zircon with high LREE has only been reported for U-rich zircon from the Gabel Hamradom granite (Geisler et al 2003), discordant zircon from the Bidoudouma stream (Horie et al 2006), and altered zircon from evolved granite plutons in Melville Peninsula in northern Canada (Erdmann et al 2013).…”

Section: Distinct Ree Compositions Of Magmatic and Hydrothermal Zirconmentioning

confidence: 99%

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Geochemistry of magmatic and hydrothermal zircon from the highly evolved Baerzhe alkaline granite: implications for Zr–REE–Nb mineralization

et al. 2013

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The Baerzhe alkaline granite pluton hosts one of the largest rare metal (Zr, rare earth elements, and Nb) deposits in Asia. It contains a geological resource of about 100 Mt at 1.84 % ZrO 2 , 0.30 % Ce 2 O 3 , and 0.26 % Nb 2 O 5 . Zirconium, rare earth elements (REE), and Nb are primarily hosted by zircon, yttroceberysite, fergusonite, ferrocolumbite, and pyrochlore. Three types of zircon can be identified in the deposit: magmatic, metamict, and hydrothermal. Primary magmatic zircon grains occur in the barren hypersolvus granite and are commonly prismatic, with oscillatory zones and abundant melt and mineral inclusions. The occurrence of aegirine and fluorite in the recrystallized melt inclusions hosted in the magmatic zircon indicates that the parental magma of the Baerzhe pluton is alkali-and F-rich. Metamict zircon grains occur in the mineralized subsolvus granite and are commonly prismatic and murky with cracks, pores, and mineral inclusions. They commonly show dissolution textures, indicating a magmatic origin with later metamictization due to deuteric hydrothermal alteration. Hydrothermal zircon grains occur in mineralized subsolvus granite and are dipyramidal with quartz inclusions, with murky CL images. They have 608 to 2,502 ppm light REE and 787 to 2,521 ppm Nb, much higher than magmatic zircon. The texture and composition of the three types of zircon indicate that they experienced remobilization and recrystallization during the transition from a magmatic to a hydrothermal system. Large amounts of Zr, REE, and Nb were enriched and precipitated during the transitional period to form the giant low-grade Baerzhe Zr-REE-Nb deposit.

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Section: Distinct Ree Compositions Of Magmatic and Hydrothermal Zirconmentioning

confidence: 97%

Section: Distinct Ree Compositions Of Magmatic and Hydrothermal Zirconmentioning

confidence: 99%

Geochemistry of magmatic and hydrothermal zircon from the highly evolved Baerzhe alkaline granite: implications for Zr–REE–Nb mineralization

et al. 2013

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“…It presents external and internal features useful for its characterization [3][4][5]. It can incorporate fluid/melt (e.g., vapor bubbles, and glass) [6,7] and other minerals (e.g., biotite, quartz, feldspar, magnesian calcite, uraninite, apatite, galena, garnet, diamond, monazite, coesite, and omphacite) in their structure during crystal growth [5,[8][9][10]. Zircon is the most widely used mineral for the extraction of information on the pre-history and genesis of magmatic, metamorphic, and sedimentary rocks [5,11].…”

Section: Introductionmentioning

confidence: 99%

U-Pb Zircon Age: Preliminary Data Evaluating the Earth History Recorded by Two Basement Rocks (Granitic Pegmatite and Mica-Schist) in Mamfe Basin (Sw Cameroon, Central Africa)

Kanouo¹

2017

J Geol Geophys

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Zircon crystals from two basement rocks (granitic pegmatite and mica-schist) in the Mamfe Basin were studied to provide petrogenetic and geochronologic constraints, therefore were characterized and dated by LA-Q-ICP-MS analytical techniques, after their internal textural features were determined.Zircon crystals with oscillatory zoning from the granitic pegmatite exceed 200 µm are mainly euhedral to prismatic. The U (≤169 ppm), Th (≤240 ppm), and Th/U (0.6-1.7) are within the range of zircon crystallized in crustal magmatic environment. Zircon crystals from the mica-schist are ˂100 to ˃200 µm in size, have magmatic (e.g., euhedral prismatic with oscillatory zone) and metamorphic (e.g., form round soccer ball, sub-hedral with overgrowth) features. The U (23-687 ppm), Th

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“…• C/min near the homogenization temperature [12,16,34]). In some cases, after homogenization, the temperature was held constant for about 10 minutes to photograph the MI before quenching.…”

Section: Description Of the Hardware And Analytical Conditionsmentioning

confidence: 99%

“…Various techniques have been used to successfully homogenize MI, including heating in one-atmosphere furnaces [9][10][11][12], heating in high-pressure (cold-seal or internally-heated) vessels [13][14][15][16], heating in piston cylinder apparatus [17][18][19], and heating in a microscope-mounted high temperature stage [8,9,[20][21][22][23]. Each of these techniques has advantages and disadvantages, as described by [15,24].…”

Section: Introductionmentioning

confidence: 99%

Application of the Linkam TS1400XY heating stage to melt inclusion studies

Esposito

Klébesz²,

Bartoli

et al. 2012

Open Geosciences

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Melt inclusions (MI) trapped in igneous phenocrysts provide one of the best tools available for characterizing magmatic processes. Some MI experience post-entrapment modifications, including crystallization of material on the walls, formation of a vapor bubble containing volatiles originally dissolved in the melt, or partial to complete crystallization of the melt. In these cases, laboratory heating may be necessary to return the MI to its original homogeneous melt state, followed by rapid quenching of the melt to produce a homogeneous glass phase, before microanalyses can be undertaken.Here we describe a series of heating experiments that have been performed on crystallized MI hosted in olivine, clinopyroxene and quartz phenocrysts, using the Linkam TS1400XY microscope heating stage. During the experiments, we have recorded the melting behaviors of the MI up to a maximum temperature of 1360 • C. In most of the experiments, the MI were homogenized completely (without crystals or bubbles) and remained homogeneous during quenching to room temperature. The resulting single phase MI contained a homogeneous glass phase. These tests demonstrate the applicability of the Linkam TS1400XY microscope heating stage to homogenize and quench MI to produce homogeneous glasses that can be analyzed with various techniques such as Electron Microprobe (EMP), Secondary Ion Mass Spectrometry (SIMS), Laser ablation Inductively Coupled Plasma Mass Spectrometry (LA ICP-MS), Raman spectroscopy, FTIR spectroscopy, etc. During heating experiments, the optical quality varied greatly between samples and was a function of not only the temperature of observation, but also on the amount of matrix glass attached to the phenocryst, the presence of other MI in the sample which are connected to the outside of the crystal, and the existence of mineral inclusions in the host.

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Melt Inclusions in Zircon

Cited by 63 publications

References 99 publications

Geochemistry of magmatic and hydrothermal zircon from the highly evolved Baerzhe alkaline granite: implications for Zr–REE–Nb mineralization

Geochemistry of magmatic and hydrothermal zircon from the highly evolved Baerzhe alkaline granite: implications for Zr–REE–Nb mineralization

U-Pb Zircon Age: Preliminary Data Evaluating the Earth History Recorded by Two Basement Rocks (Granitic Pegmatite and Mica-Schist) in Mamfe Basin (Sw Cameroon, Central Africa)

Application of the Linkam TS1400XY heating stage to melt inclusion studies

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