Boron isotopic variations in tourmaline from metacarbonates and associated calc-silicate rocks from the Bohemian Massif: Constraints on boron recycling in the Variscan orogen

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F21%3APU139132" target="_blank" >RIV/00216305:26110/21:PU139132 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14310/21:00118825 RIV/00094862:_____/21:N0000002 RIV/67985831:_____/21:00541987

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S1674987120300815" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1674987120300815</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gsf.2020.03.009" target="_blank" >10.1016/j.gsf.2020.03.009</a>

Result language

angličtina

Original language name

Boron isotopic variations in tourmaline from metacarbonates and associated calc-silicate rocks from the Bohemian Massif: Constraints on boron recycling in the Variscan orogen

Original language description

Various metacarbonate and associated calc-silicate rocks form minor but genetically significant components of the lithological units in the Bohemian Massif of the Variscan orogen in Central Europe. These rocks vary in terms of their lithostratigraphy, chemical composition and mineral assemblage (dolomite/calcite ratio, silicate abundance). Tourmaline is present in five paragenetic settings within the metacarbonate and calc-silicate units. Type I comprises individual, euhedral, prismatic grains and grain aggregates in a carbonate-dominant (calcite +/- dolomite) matrix poor in silicates. Type II is characterized by euhedral to subhedral grains and coarse- to fine-grained aggregates in silicate-rich layers/nests within metacarbonate bodies whereas type III occurs as prismatic grains and aggregates at the contact zones between carbonate and associated silicate host rocks. Type IV is in veins crosscutting metacarbonate bodies, and type V tourmaline occurs at the exocontacts of elbaite-subtype granitic pegmatite. Tourmaline from the different settings shows distinctive compositional features. Typical for type I are Mg-rich compositions, with fluor-uvite > dravite>> magnesio-lucchesiite. Tourmalines from type II silicate-rich layers/nests are highly variable, corresponding to oxy-schorl, magnesio-foitite, Al-rich dravite and fluor-uvite. Typical for type III tourmalines are Ca,Ti-bearing oxy-dravite compositions. The type IV veins feature dravite and fluor-uvite tourmaline compositions whereas type V tourmaline is Li,F-rich dravite. Tourmaline is the only Bbearing phase in paragenetic types I-IV, where it is characterised by two principal ranges of B-isotope composition (delta B-11 = -13 parts per thousand to -9 parts per thousand and -18 parts per thousand to -14 parts per thousand). These ranges correspond to regionally different units of the Moldanubian Zone. Thus, the Svratka Unit (Moldanubian Zone s.1.) contains only isotopically lighter tourmaline (delta B-11 = -18%0

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geoscience Frontiers

ISSN

1674-9871

e-ISSN

—

Volume of the periodical

12

Issue of the periodical within the volume

1

Country of publishing house

CN - CHINA

Number of pages

12

Pages from-to

219-230

UT code for WoS article

000597401000015

EID of the result in the Scopus database

2-s2.0-85084800638