Formation of Mg-rich Olivine Pseudomorphs in Serpentinized Dunite from the Mesoarchean Nuasahi Massif, Eastern India: Insights into the Evolution of Fluid Composition at the Mineral–Fluid Interface

Majumdar, Alik S.; Hövelmann, Jörn; Vollmer, C.; Berndt, Jasper; Mondal, Sisir K.; Putnis, Andrew

doi:10.1093/petrology/egv070

Cited by 22 publications

(17 citation statements)

References 82 publications

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“…Other processes leading to the formation of nearly pure forsterite include serpentinization/deserpentinization of dunites and silicification of dolomite [18][19][20][21][22][23]. However, there has not been any mechanism to concentrate thus-formed forsterite grains to form a massive monomineralic rock like the jianite reported in this study.…”

mentioning

confidence: 72%

“…The trace elements 7 Li, 11 B, 23 Na, 24 Mg, 27 Al, 31 P, 43 Ca, 44 Ca, 45 Sc, 47 Ti, 49 Ti, 51 V, 53 Cr, 55 Mn, 59 Co, 60 Ni, 63 Cu, 66 Zn, 69 Ga, 88 Sr, 89 Y, 90 Zr, 93 Nb, and 140 Ce of the olivine were analyzed by using an Agilent 7500 Ce laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) hosted by the MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University. The LA-ICP-MS system The textures of the samples were examined by using a SUPRA 55 scanning electron microscope (SEM) hosted at the China University of Geosciences (Beijing).…”

Section: Sampling Location and Analytical Methodsmentioning

confidence: 99%

“…Their genesis has been attributed to some special processes such as subsurface oxidation, subsolidus re-equilibration, and interaction with carbonates [14]. Additionally, narrow pseudomorphic olivine rims with Mg# > 96 were occasionally found surrounding primary olivine grains (Mg# = ~89-92) in some serpentinites, with their genesis ascribed to the serpentinization or deserpentinization reaction [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Jianite: Massive Dunite Solely Made of Virtually Pure Forsterite from Ji’an County, Jilin Province, Northeast China

Wang

Yan

et al. 2020

Minerals

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A rare massive yellowish-green serpentinized dunite, covering a minimum area up to ~50 m2, has been found in Ji’an County, Jilin Province, Northeast China. It contains primary olivine and secondary serpentine (antigorite) and brucite. Other primary minerals like orthopyroxene, clinopyroxene, and aluminum-rich phase (such as garnet, spinel, and plagioclase), frequently appearing in ultramafic rocks, have not been identified. The olivine is essentially pure forsterite, with an Mg# (100 × Mg/(Mg + Fe)) of ~99.6–99.7. Due to these distinct features, we especially name the protolith of this dunite as jianite (集安岩). The forsterite grains range up to ~2 mm, show clear equilibrium textures such as nearly straight grain boundaries and ~120° dihedral angles at their triple junctions, and display no intragranular or intergranular composition variations. They are extensively ruptured and hydrated (i.e., serpentinized), with the fractures (and the grain boundaries as well) filled by fine-grained antigorite (ideally Mg6(Si4O10)(OH)8) and brucite (ideally Mg(OH)2). These secondary phases are also extremely poor in Fe, indicating a good chemical equilibrium with the forsterite. The serpentinization reaction may have proceeded as forsterite + fluid = antigorite + brucite at temperatures of ~425(25) °C and at relatively low but undetermined pressures. The fluid was likely a B-rich, but Si-poor dilute aqueous fluid, as implied by the trace element characteristics and water-related infrared features of the forsterites in equilibrium. The petrogenesis of the jianite is presently unclear.

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confidence: 72%

Section: Sampling Location and Analytical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Jianite: Massive Dunite Solely Made of Virtually Pure Forsterite from Ji’an County, Jilin Province, Northeast China

Wang

Yan

et al. 2020

Minerals

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“…Olivine with nearly forsterite end composition is rare and can only be formed in special geological environments. For example, rare forsterite (Fo = 97-99) inclusion in magnesiochromite was reported by Xiong et al [40], and Majumdar et al [41] found a pseudomorph rim of Mg-rich olivine (Fo = 98) in serpentinized dunite. Blondes et al [42] found several olivine grains with Fo at up to 99.8 in multiple primitive basaltic lava flows from Big Pine Volcanic Field (Inyo, CA, USA).…”

Section: The Rarity Of Mg-and B-rich Forsteritementioning

confidence: 90%

“…Sykes et al [22] noted that olivine from the Tayozhnoye iron deposit, Siberia, Russia, contains substantial B 2 O 3 (1.11-1.35 wt%). Majumdar et al [41] reported a boron content up to 10.4 ppm in high-magnesium olivine. Nekrylov et al [43] presented that B concentrations of olivine from magnesian skarns and silicate marbles vary from 23 to 856 ppm.…”

Section: The Rarity Of Mg-and B-rich Forsteritementioning

confidence: 99%

Natural Forsterite Strongly Enriched in Boron: Crystal Structure and Spectroscopy

Peng

Yang

et al. 2022

Crystals

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Boron is a typical crustal element and largely incompatible in olivine. Most natural olivine samples have very low concentrations of boron. Recently, forsterite with high boron content (up to 60.53 wt% MgO and 1795.91 ppm B) has been discovered in the Jian forsterite jade in the Jian area of northeast China. In this study, B-rich forsterite was examined by electron microprobes, Laser Ablation-Inductively Coupled Plasma Mass Spectrometry, Single crystal X-ray diffraction, Raman spectroscopy, and infrared spectroscopy. The B-rich forsterite is orthorhombic, existing in space group Pnma, and its unit-cell parameters are: a = 10.1918(7) Å, b = 5.9689(4) Å, c = 4.7484(3) Å, α = 90°, β = 90°, γ = 90°, and V = 288.86(3) Å3. The results of single crystal X-ray diffraction analysis indicate that the unit-cell parameters (a, b, and c) and unit-cell volume of forsterite in Jian forsterite jade are much smaller than those of known olivine. An equivalent set of Raman and infrared spectra were measured for the natural B-rich forsterite and compared to the results for mantle forsterite with a Fo value of ~91. The Raman spectrum of B-rich forsterite is similar to that of mantle olivine. We conclude that the systematic peak position shifts towards higher Raman shift with increasing Fo content. The infrared spectrum of B-rich forsterite crystals is characterized by strong absorption bands at 761, 1168, 1259, and 1303 cm−1, which are assigned to stretching vibrations of BO3 groups. Our data further confirm the existence of the B(F, OH)Si–1O–1 coupled substitution in natural B-rich forsterite.

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Geochemistry and mineralogy of Pd in the magnetitite layer within the upper gabbro of the Mesoarchean Nuasahi Massif (Orissa, India)

et al. 2017

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Formation of Mg-rich Olivine Pseudomorphs in Serpentinized Dunite from the Mesoarchean Nuasahi Massif, Eastern India: Insights into the Evolution of Fluid Composition at the Mineral–Fluid Interface

Cited by 22 publications

References 82 publications

Jianite: Massive Dunite Solely Made of Virtually Pure Forsterite from Ji’an County, Jilin Province, Northeast China

Jianite: Massive Dunite Solely Made of Virtually Pure Forsterite from Ji’an County, Jilin Province, Northeast China

Natural Forsterite Strongly Enriched in Boron: Crystal Structure and Spectroscopy

Geochemistry and mineralogy of Pd in the magnetitite layer within the upper gabbro of the Mesoarchean Nuasahi Massif (Orissa, India)

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