@article{fdi:010054090, title = {{O}-18/{O}-16 and {V}/{C}r ratios in gem tsavorites from the {N}eoproterozoic {M}ozambique metamorphic belt : a clue towards their origins ?}, author = {{G}iuliani, {G}aston and {F}allick, {A}. {E}. and {F}eneyrol, {J}. and {O}hnenstetter, {D}. and {P}ardieu, {V}. and {S}aul, {M}.}, editor = {}, language = {{ENG}}, abstract = {{T}he combination of oxygen isotope composition with {V}-{C}r-{M}n trace element concentrations of {V}-bearing garnets (tsavorites) originating from the main deposits of the {N}eoproterozoic {M}ozambique {M}etamorphic {B}elt is reported for the first time. {T}he database enables the identification of the geological and geographical sources of the main productive areas from northern and southern {T}anzania, {K}enya, and {M}adagascar. {T}hree consistent sets of delta {O}-18 values between 9.5a{E}uro degrees and 11.0a{E}uro degrees, 11.6a{E}uro degrees and 14.5a{E}uro degrees, and 15.5a{E}uro degrees and 21.1a{E}uro degrees have been recognized for primary deposits hosted in graphitic gneisses related to the {N}eoproterozic metasedimentary series. {T}he delta {O}-18 value of tsavorite is a good tracer of the environment of its formation; the delta {O}-18 of the fluid in equilibrium with tsavorite was buffered by the host rock during metamorphism and fluid-rock interaction. {T}his study is a first step in characterizing the geochemistry of gem tsavorite from most of the deposits and occurrences worldwide.}, keywords = {{M}ozambique {M}etamorphic {B}elt ; {T}savorite ; {O}xygen isotopes ; {V}/{C}r ratio ; {M}n ; {G}eographic and geologic origins}, booktitle = {}, journal = {{M}ineralium {D}eposita}, volume = {46}, numero = {7}, pages = {671--676}, ISSN = {0026-4598}, year = {2011}, DOI = {10.1007/s00126-011-0355-6}, URL = {https://www.documentation.ird.fr/hor/fdi:010054090}, }