Petrogenetic controls on the origin of tourmalinite veins from Mandrolisai igneous massif (central Sardinia, Italy): Insights from tourmaline crystal chemistry

Bosi, Ferdinando; Naitza, Stefano; Secchi, Francesco; Conte, Aida Maria; Cuccuru, Stefano; Andreozzi, Giovanni B.; Skogby, Henrik; Hålenius, Ulf

doi:10.1016/j.lithos.2019.05.042

Cited by 12 publications

(5 citation statements)

References 68 publications

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“…Tourmaline is one of the most fascinating and colourful accessory mineral occurring in a variety of geological environments, from diagenetic stages to granulite facies grade (e.g., Henry and Dutrow 1996;Dutrow and Henry 2011;Bosi et al 2018aBosi et al , 2019aAndreozzi et al 2020).…”

Section: Introductionmentioning

confidence: 99%

In situ high-temperature behaviour of fluor-elbaite: breakdown conditions and products

et al. 2021

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The thermal behaviour of a fluor-elbaite from Minas Gerais (Brazil) was investigated at room pressure through in situ high-temperature X-ray powder diffraction (HT-XRPD), until the breakdown conditions were reached. The variations of fluor-elbaite structural parameters (unit-cell parameters and mean bond distances) were monitored together with site occupancies, and two main internal reactions were identified: the thermally-induced Fe oxidation process counterbalanced by (OH)– deprotonation, which starts at 500 °C (773 K), followed by a partial intracrystalline Fe–Al exchange between the octahedrally-coordinated Y and Z sites. The fluor-elbaite breakdown reaction occurs between 850 °C (1123 K) and 900 °C (1173 K). The breakdown products were identified at room temperature by XRPD and the breakdown reaction can be described by the following reaction: tourmaline → B-bearing mullite + hematite + spinel + B-poor (Na, Li, H2O)-bearing glass. Boromullite itself was not observed in the final heating products, and the B-bearing mullite from the breakdown reaction exhibited unit-cell parameters a = 7.5382(2) Å, b = 7.6749(2) Å, c = 2.8385(1) Å, V = 164.22(1) Å3 (space group Pbam) consistent with an approximate Al8.5B1.5Si2O19 composition.

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Section: Introductionmentioning

confidence: 99%

In situ high-temperature behaviour of fluor-elbaite: breakdown conditions and products

et al. 2021

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“…The X -site occupancy is usually related to both paragenesis and crystallisation conditions of the host rock, and these relations may be used to reconstruct the host-rock thermal and chemical history (e.g. Henry and Dutrow, 1996; van Hinsberg et al , 2011a,b; Dutrow and Henry, 2018; Bosi et al , 2018, 2019c; Ahmadi et al , 2019). A further level of classification into subgroups is based on charge arrangements at the Y and Z sites.…”

Section: Introductionmentioning

confidence: 99%

Mn-bearing purplish-red tourmaline from the Anjanabonoina pegmatite, Madagascar

Bosi

Celata

Skogby

et al. 2021

MinMag

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A gem-quality purplish-red tourmaline sample of alleged liddicoatitic composition from the Anjanabonoina pegmatite, Madagascar, has been fully characterised using a multi-analytical approach to define its crystal-chemical identity. Single-crystal X-ray diffraction, chemical and spectroscopic analysis resulted in the formula: X(Na0.41□0.35Ca0.24)Σ1.00Y(Al1.81Li1.00Fe3+0.04Mn3+0.02Mn2+0.12Ti0.004)Σ3.00ZAl6 [T(Si5.60B0.40)Σ6.00O18] (BO3)3 (OH)3W[(OH)0.50F0.13O0.37]Σ1.00 which corresponds to the tourmaline species elbaite having the typical space group R3m and relatively small unit-cell dimensions, a = 15.7935(4) Å, c = 7.0860(2) Å and V = 7.0860(2) Å3. Optical absorption spectroscopy showed that the purplish-red colour is caused by minor amounts of Mn3+ (Mn2O3 = 0.20 wt.%). Thermal treatment in air up to 750°C strongly intensified the colour of the sample due to the oxidation of all Mn2+ to Mn3+ (Mn2O3 up to 1.21 wt.%). Based on infrared and Raman data, a crystal-chemical model regarding the electrostatic interaction between the X cation and W anion, and involving the Y cations as well, is proposed to explain the absence or rarity of the mineral species ‘liddicoatite’.

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“…Granite intrusion was probably a source of heat and light elements (such as B and F) for extensive tourmaline formation in metamorphic volcano-sedimentary host rocks of the Gelnica group. The change in composition could result from different processes which controlled the tourmaline composition, especially granite and host-rock influence (London et al 1996;Bosi et al 2019). Dravitic cores of Tur I could indicate metamorphic pre-intrusion origin, as suggested by Chovan et al (2003), but more likely indicate the host-rock control over the Tur I composition in the first phase of tourmaline crystallization.…”

Section: Genetic Environment and Evolution Of Tourmalinitesmentioning

confidence: 89%

Crystal chemistry and evolution of tourmaline in tourmalinites from Zlatá Idka, Slovakia

Bačík¹,

Odzín²,

Uher³

et al. 2022

J. Geosci.

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Tourmalinites occur in early-Paleozoic metamorphic rocks of the Gemeric Unit near Zlatá Idka village, Western Carpathians, eastern Slovakia. Tourmaline compositions, analyzed with the electron microprobe, include a wide range of tourmaline species. Tourmaline in tourmalinites from Zlatá Idka is compositionally variable, with the dominant substitution Mg-Fe 2+ consistent with prevalent schorl-dravite compositions and their fluor-and oxy-dominant counterparts -fluorschorl, fluor-dravite, oxy-schorl and oxy-dravite. Portions of tourmaline are enriched in Ca in the form of the fluor-uvite and magnesio-lucchesiite components. A subset of the compositions has Ti > 0.25 atoms per formula unit (apfu) and corresponds to the hypothetical "magnesio-dutrowite", Mg-dominant analogue of dutrowite. In addition, some of the tourmalines are X-site vacant and classified as foitite. The crystal chemistry of tourmaline is complex and influenced by several exchange mechanisms, including Mg(Fe) -

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Petrogenetic controls on the origin of tourmalinite veins from Mandrolisai igneous massif (central Sardinia, Italy): Insights from tourmaline crystal chemistry

Abstract: An inclusive study of tourmaline, a well-known petrogenetic indicator, allowed the reconstruction of late-stage evolution of B-bearing Variscan granodioritic magmas in Sardinia batholith (Italy). Tourmaline samples from Mandrolisai igneous massif were chemically and

Cited by 12 publications

References 68 publications

In situ high-temperature behaviour of fluor-elbaite: breakdown conditions and products

In situ high-temperature behaviour of fluor-elbaite: breakdown conditions and products

Mn-bearing purplish-red tourmaline from the Anjanabonoina pegmatite, Madagascar

Crystal chemistry and evolution of tourmaline in tourmalinites from Zlatá Idka, Slovakia

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