Chapter 10. METAMORPHIC TOURMALINE AND ITS PETROLOGIC APPLICATIONS

Henry, Darreil J.; Dutrow, Bárbara L.

doi:10.1515/9781501509223-012

Cited by 181 publications

(232 citation statements)

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“…Less frequently, it also occurs in pegmatites and as authigenic overgrowths on other tourmalines in sedimentary rocks (e.g., Henry and Dutrow 1996).…”

Section: Introductionmentioning

confidence: 99%

Thermal stability of extended clusters in dravite: a combined EMP, SREF and FTIR study

2016

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“…Less frequently, it also occurs in pegmatites and as authigenic overgrowths on other tourmalines in sedimentary rocks (e.g., Henry and Dutrow 1996).…”

Section: Introductionmentioning

confidence: 99%

Thermal stability of extended clusters in dravite: a combined EMP, SREF and FTIR study

2016

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“…[1] The tourmaline family consists of rock-forming minerals found in a variety of geologic settings. [1] Results obtained from tourmaline investigations may not only provide the framework for understanding the mineralization processes but would also be useful to earth sciences, such as geothermometry, geochemistry, and geochronology.…”

Section: Introductionmentioning

confidence: 99%

“…There are currently 14 tourmaline end members that have been accepted by the International Mineralogical Association (IMA). [1] These 14 end members are elbaite, schorl, dravite, olenite, chromdravite, buergerite, povondraite, vanadiumdravite, liddicoatite, uvite, feruvite, rossmanite, foitite, and magnesiofoitite.…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopic study of various types of tourmalines

Hoàng

Hiền

Chen

et al. 2011

J Raman Spectroscopy

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Both polarized and unpolarized Raman scattering studies of seven tourmalines from the Lucyen mines in Vietnam are presented. These tourmalines, according to their chemical compositions, can be classified into four groups: G1, liddicoatite; G2, elbaite; G3, uvite; and G4, feruvite. The Raman spectra were recorded in two spectral ranges, i.e. 150-1600 cm −1 and 3000-4000 cm −1 . In the lower spectral range, which covers the metal ion-oxygen bond vibrations, all the observed A 1 and E modes are identified. In the higher spectral range, we investigated the OH stretching vibrations and showed that all the observed OH stretching modes have the A 1 character. In both spectral ranges, we found that the same group classification of tourmalines can be applied, and the grouping characterizations are consistent with the chemical composition results.

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“…For the normalization of the structural formula, the analyses were recalculated on the basis of 15 (T+Z+Y) cations (Henry and Dutrow 1996), assuming the theoretical amount of 3 a.p.f.u. for boron despite that some authors have suggested that excess of B may exist in T positions (Tagg et al 1999).…”

Section: Composition Of the Tourmalinementioning

confidence: 99%

“…This confirms that the Fe enrichment observed in the crystal rims could be related with an increase of the aFe 3+ during ore deposition or a shift in the redox state of the fluids. The abundance of magnetite and the presence of anhydrite in the hydrother- Structural formula on the basis of T+Z+Y=15 according to Henry and Dutrow (1996). Total Fe measured as FeO.…”

Section: Composition Of the Tourmalinementioning

confidence: 99%

The boron isotope geochemistry of tourmaline-rich alteration in the IOCG systems of northern Chile: implications for a magmatic-hydrothermal origin

2011

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Hydrothermal tourmaline is common in the iron oxide-copper-gold (IOCG) deposits of the Coastal Cordillera of Chile where it occurs as large crystals in the groundmass of magmatic-hydrothermal breccias, such as in the Silvita or Tropezón ore bodies, or as small grains in replacive bodies or breccia cement in the ore-bearing andesite, as seen at the Candelaria or Carola deposits. Tourmaline shows strong chemical zoning and has a composition of schorl-dravite with significant povondraite and uvite components. The observed boron isotope composition is fairly variable, between −10.4‰ and +6.0‰ with no major differences among the different deposits, suggesting a common genetic mechanism. The δ 11 B values are significantly lower than those of seawater or marine evaporites and very similar to those of younger porphyry copper deposits and volcanic rocks in the region, indicating that the boron has a common, likely magmatic, origin. The predominant boron source was ultimately dewatering of the subducting slab with a significant contribution derived from the overlying continental basement. The range of δ 11 B values is between those of the porphyry copper deposits and the porphyry tin deposits of the Andes, suggesting that the IOCG mineralization might be genetically related to fluids having more crustal contamination than the porphyry copper deposits; such an interpretation is at odds with current models that propose that the Andean IOCG deposits are related to juvenile melts or to the circulation of basinal brines. Furthermore, the obtained δ 11 B data are markedly different from those of the tourmaline in the Carajás IOCG district (Brazil), suggesting that IOCGs do not form by a unique mechanism involving only one type of fluids.

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Chapter 10. METAMORPHIC TOURMALINE AND ITS PETROLOGIC APPLICATIONS

Cited by 181 publications

References 0 publications

Thermal stability of extended clusters in dravite: a combined EMP, SREF and FTIR study

Thermal stability of extended clusters in dravite: a combined EMP, SREF and FTIR study

Raman spectroscopic study of various types of tourmalines

The boron isotope geochemistry of tourmaline-rich alteration in the IOCG systems of northern Chile: implications for a magmatic-hydrothermal origin

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