Revealing the role of crystal chemistry in REE fractionation in skarn garnets: insights from lattice-strain theory

Wen, Guang; Qiu, Jun; Hofstra, Albert H.; Harlov, Daniel E.; Ren, Zhe; Li, Jian-Wei

doi:10.1007/s00410-024-02095-3

Contrib Mineral Petrol

2024

DOI: 10.1007/s00410-024-02095-3

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Revealing the role of crystal chemistry in REE fractionation in skarn garnets: insights from lattice-strain theory

Guang Wen,

Jun Qiu,

Albert H. Hofstra

et al.

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2024

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Cited by 2 publications

References 61 publications

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Garnet U-Pb geochronology and geochemistry of the Lazhushan Fe skarn deposit, Edong District, eastern China

Qiu,

Zhou,

Shang

et al. 2024

Ore Geology Reviews

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Garnet U-Pb geochronology and geochemistry of the Lazhushan Fe skarn deposit, Edong District, eastern China

Qiu,

Zhou,

Shang

et al. 2024

Ore Geology Reviews

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Hydro‐uvarovite from Mantle Peridotites of Naga Hills Ophiolite: A Mineral Tracer for Neo‐Tethyan Mantle Wedge Metasomatism

VERENCAR,

SAHA,

SORCAR

et al. 2024

Acta Geologica Sinica (Eng)

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Hydrous Cr‐bearing uvarovite garnets are rare in natural occurrences and belong to the ugrandite series and exist in binary solid solutions with grossular and andradite garnets. Here, we report the occurrence of hydrous uvarovite garnet having Cr2O3 upto 19.66 wt% and CaO of 32.12–35.14 wt% in the serpentinized mantle peridotites of Naga Hills Ophiolite (NHO), India. They occur in association with low‐Cr diopsides. They are enriched in LILE (Ba, Sr), LREEs, with fractionating LREE‐MREE [avg. (La/Sm)N = 2.16] with flat MREE/HREE patterns [avg. (Sm/Yb)N = 0.95]. Raman spectra indicate the presence of hydroxyl (OH–) peaks from 3500 to 3700 cm–1. Relative abundances in fluid mobile elements and their close association with clinopyroxenes are suggestive of the formation of uvarovite garnets through low temperature metasomatic alteration of low‐Cr diopsides by hydrothermal slab fluids. The high LREE concentration and absence of Eu anomaly in the garnet further attest to alkaline nature of the transporting slab dehydrated fluid rather the involvement of low‐pH solution. The chemical characteristics of the hydroxyl bearing uvarovite hosted by the mantle peridotite of NHO deviate from the classical features of uvarovite garnet, and their origin is attributed to the fluid‐induced metasomatism of the sub arc mantle wedge in a suprasubduction zone regime.

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Revealing the role of crystal chemistry in REE fractionation in skarn garnets: insights from lattice-strain theory

Cited by 2 publications

References 61 publications

Garnet U-Pb geochronology and geochemistry of the Lazhushan Fe skarn deposit, Edong District, eastern China

Garnet U-Pb geochronology and geochemistry of the Lazhushan Fe skarn deposit, Edong District, eastern China

Hydro‐uvarovite from Mantle Peridotites of Naga Hills Ophiolite: A Mineral Tracer for Neo‐Tethyan Mantle Wedge Metasomatism

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