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![(A) Tectonic map of Kenya and Tanzania (modified after Fritz et al. 2013) with the location of the tsavorite and tanzanite deposits studied in this paper. (B) Tectonic map of Madagascar (modified after Fritz et al. 2013) with the location of the tsavorite deposits studied in this paper. (C) Geological sketch map of SE Kenya and NE Tanzania (modified after Tenczer et al. 2013) showing the tsavorite and tanzanite deposits studied in this paper. ANS: Arabian Nubian Shield; EG: Eastern Granulite; WG: Western Granulite.]()
![Oxygen and carbon isotopic compositions of calcite and dolomite (‰, VSMOW and VPDB, respectively) from the different types of marble associated with the Namalulu tsavorite deposit.]()
![(a) Location of the Neoproterozoic metamorphic Mozambique Belt (in black) in Tanzania (after Pinna et al. 2004). (b) Geological map of the Lelatema Fold Belt area with the locations of the tsavorite deposits of Merelani, Lemshuku, and Namalulu (modified after Grainger 1964, Macfarlane 1965, unpublished Nabarera Quarter Degree Sheet n°87 from the Tanzanian Geological Survey).]()
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![The use of trace-element chemistry of tsavorites from the Neoproterozoic Metamorphic Mozambique Belt for geographical origin determination. (a) The diagram vanadium vs. chromium contents (in ppm) illustrates the usefulness of the V/Cr ratio for separating Kenyan tsavorites from the other worldwide deposits. (b) Attempt to refine the geographic origin of tsavorites considering the upper and lower limits of V and Cr contents for the determination of geographic boxes. Kenyan tsavorites have distinct Cr-contents and constant V/Cr ratio for each deposit which permits to pinpoint the origin of different mines. Pakistani and Madagascar tsavorite fields are overlapping but the high contents of vanadium and chromium for some Pakistani tsavorites can be used for deciphering the origin. Antarctic tsavorites have a specific chemical signature with a high V/Cr ratio.]()
![Sm-Nd isochrons calculated for different sets of samples to determine the age of the tsavorite and tanzanite mineralization from Kenya, Tanzania, and Madagascar. (A) All samples (n = 19) from the NMMB, except the tsavorite from Baraka, Kenya. (B) All tsavorites (n = 4) and tanzanites (n = 5) from the deposits located in the Lelatema fold belt in northern Tanzania, except the tanzanite from Karot. (C) All tsavorites (n = 4) from the deposits located in the Lelatema fold belt. (D) All tanzanites (n = 5) from the deposits located in the Lelatema Fold Belt, except the tanzanite from Karot.]()
![Ternary diagram goldmanite–grossular–uvarovite for tsavorites from different deposits of the Neoproterozoic Metamorphic Mozambique Belt. Distribution of the chemical data of tsavorite by countries and deposits.]()
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![Ternary V–Cr–Mn diagram presenting the five chemical types of worldwide tsavorite defined by their trace-element composition. Distribution of the chemical composition by countries and deposits.]()
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![Sulfur isotopic composition (δ34S in ‰ V-CDT) of Tanzanian sulfide minerals from graphitic rocks (gneisses and calc-silicates) hosting tsavorite and tanzanite and from overlying marbles (Lelatema fold belt and Ruangwa deposits). Ranges of isotopic composition for various systems are reported (Claypool et al. 1980, Warren 2006, Halverson et al. 2010).]()
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1-20 OF 50 RESULTS FOR
tsavorite deposits
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1
Book Chapter
TSAVORITE AND TANZANITE DEPOSITS Available to Purchase
Series: Short Courses
Publisher: Mineralogical Association of Canada
Published: 01 January 2014
DOI: 10.3749/9780921294696.ch07
EISBN: 978-0-921294-69-6
.... In this chapter we show that the formation of these two high-value colored gemstones and their genetic model are unique ( Feneyrol 2012 ; Feneyrol et al. 2013 ). This review of the different gem tsavorite and tanzanite deposits from the NMMB and elsewhere synthesizes descriptions of their geology, mineralogy...
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Journal Article
EVIDENCE OF EVAPORITES IN THE GENESIS OF THE VANADIAN GROSSULAR ‘TSAVORITE’ DEPOSIT IN NAMALULU, TANZANIA Available to Purchase
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 June 2012
The Canadian Mineralogist (2012) 50 (3): 745–769.
...Julien Feneyrol; Daniel Ohnenstetter; Gaston Giuliani; Anthony E. Fallick; Claire Rollion-Bard; Jean-Louis Robert; Elias P. Malisa Abstract The Namalulu tsavorite (vanadian grossular up to 0.80 wt.% V 2 O 3 ) deposit in northeastern Tanzania occurs in metasomatized graphitic gneiss overlain...
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δ 34 S ISOTOPIC COMPOSITION OF SULFIDES (PYRITE AND SPHALERITE) ASSOCIATED ... Available to Purchase
in Age and Origin of the Tsavorite and Tanzanite Mineralizing Fluids in the Neoproterozoic Mozambique Metamorphic Belt
> The Canadian Mineralogist
Published: 01 July 2017
TABLE 4. δ 34 S ISOTOPIC COMPOSITION OF SULFIDES (PYRITE AND SPHALERITE) ASSOCIATED WITH TSAVORITE AND TANZANITE FROM THE LELATEMA FOLD BELT DEPOSITS IN NORTHERN TANZANIA (LEMSHUKU, MERELANI, NAMALULU DEPOSITS) AND FROM THE RUANGWA TSAVORITE DEPOSIT IN SOUTHERN TANZANIA
Image
(A) Tectonic map of Kenya and Tanzania (modified after Fritz et al . 2013... Available to Purchase
in Age and Origin of the Tsavorite and Tanzanite Mineralizing Fluids in the Neoproterozoic Mozambique Metamorphic Belt
> The Canadian Mineralogist
Published: 01 July 2017
Fig. 2. (A) Tectonic map of Kenya and Tanzania (modified after Fritz et al . 2013 ) with the location of the tsavorite and tanzanite deposits studied in this paper. (B) Tectonic map of Madagascar (modified after Fritz et al . 2013 ) with the location of the tsavorite deposits studied
Image
Oxygen and carbon isotopic compositions of calcite and dolomite (‰, VSMOW a... Available to Purchase
in EVIDENCE OF EVAPORITES IN THE GENESIS OF THE VANADIAN GROSSULAR ‘TSAVORITE’ DEPOSIT IN NAMALULU, TANZANIA
> The Canadian Mineralogist
Published: 01 June 2012
Fig. 6 Oxygen and carbon isotopic compositions of calcite and dolomite (‰, VSMOW and VPDB, respectively) from the different types of marble associated with the Namalulu tsavorite deposit.
Image
(a) Location of the Neoproterozoic metamorphic Mozambique Belt (in black) i... Available to Purchase
in EVIDENCE OF EVAPORITES IN THE GENESIS OF THE VANADIAN GROSSULAR ‘TSAVORITE’ DEPOSIT IN NAMALULU, TANZANIA
> The Canadian Mineralogist
Published: 01 June 2012
Fig. 1 (a) Location of the Neoproterozoic metamorphic Mozambique Belt (in black) in Tanzania (after Pinna et al. 2004 ). (b) Geological map of the Lelatema Fold Belt area with the locations of the tsavorite deposits of Merelani, Lemshuku, and Namalulu (modified after Grainger 1964
Journal Article
Age and Origin of the Tsavorite and Tanzanite Mineralizing Fluids in the Neoproterozoic Mozambique Metamorphic Belt Available to Purchase
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 July 2017
The Canadian Mineralogist (2017) 55 (4): 763–786.
...TABLE 4. δ 34 S ISOTOPIC COMPOSITION OF SULFIDES (PYRITE AND SPHALERITE) ASSOCIATED WITH TSAVORITE AND TANZANITE FROM THE LELATEMA FOLD BELT DEPOSITS IN NORTHERN TANZANIA (LEMSHUKU, MERELANI, NAMALULU DEPOSITS) AND FROM THE RUANGWA TSAVORITE DEPOSIT IN SOUTHERN TANZANIA ...
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Journal Article
New typology and origin of tsavorite based on trace-element chemistry Available to Purchase
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 March 2014
European Journal of Mineralogy (2014) 26 (2): 293–308.
...+ ). Tsavorite was discovered by the Scottish geologist Campbell Bridges in 1967 in northeastern Tanzania ( Bridges, 1974 ). The economic deposits are located in Kenya, Tanzania and Madagascar but other small occurrences are known in Pakistan and Antarctica ( Feneyrol et al ., 2013 ). The production recently...
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Journal Article
ORIGIN OF TANZANITE AND ASSOCIATED GEMSTONE MINERALIZATION AT MERELANI, TANZANIA Available to Purchase
Journal: South African Journal of Geology
Publisher: Geological Society of South Africa
Published: 01 June 2014
South African Journal of Geology (2014) 117 (1): 15–30.
... ; Feynerol et al. 2013a ). As discussed by Feneyrol et al. (2012) , the genesis of the tsavorite deposits has not been studied in detail. Figure 1 ( a ). Sketch map of the Lelatema antiform based on the maps of Grainger (1964) , Macfarlane (1965) , Fritz et al. (2009) , and Figure 1 of Feneyrol...
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Journal Article
Chronological Constraints On Tsavorite Mineralizations and Related Metamorphic Episodes In Southeast Kenya Available to Purchase
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 September 2017
The Canadian Mineralogist (2017) 55 (5): 845–865.
....,
Saul,
E.,
Saul,
J.M.,
&
Pardieu,
V.
(2010)
Lithostratigraphic and structural controls of ‘tsavorite' deposits at Lemshuku, Merelani area, Tanzania .
Comptes Rendus Geoscience
342...
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Image
The use of trace-element chemistry of tsavorites from the Neoproterozoic Me... Available to Purchase
in New typology and origin of tsavorite based on trace-element chemistry
> European Journal of Mineralogy
Published: 01 March 2014
worldwide deposits. (b) Attempt to refine the geographic origin of tsavorites considering the upper and lower limits of V and Cr contents for the determination of geographic boxes. Kenyan tsavorites have distinct Cr-contents and constant V/Cr ratio for each deposit which permits to pinpoint the origin
Image
Sm-Nd isochrons calculated for different sets of samples to determine the a... Available to Purchase
in Age and Origin of the Tsavorite and Tanzanite Mineralizing Fluids in the Neoproterozoic Mozambique Metamorphic Belt
> The Canadian Mineralogist
Published: 01 July 2017
( n = 5) from the deposits located in the Lelatema fold belt in northern Tanzania, except the tanzanite from Karot. (C) All tsavorites ( n = 4) from the deposits located in the Lelatema fold belt. (D) All tanzanites ( n = 5) from the deposits located in the Lelatema Fold Belt, except the tanzanite
Image
Ternary diagram goldmanite–grossular–uvarovite for tsavorites from differen... Available to Purchase
in New typology and origin of tsavorite based on trace-element chemistry
> European Journal of Mineralogy
Published: 01 March 2014
Fig. 4 Ternary diagram goldmanite–grossular–uvarovite for tsavorites from different deposits of the Neoproterozoic Metamorphic Mozambique Belt. Distribution of the chemical data of tsavorite by countries and deposits.
Journal Article
Garnet: From Stone to Star Available to Purchase
Journal: Elements
Publisher: Mineralogical Society of America
Published: 01 December 2013
Elements (2013) 9 (6): 453–456.
... : 273 - 276
Feneyrol J 20 coauthors ( 2013 ) New aspects and perspectives on tsavorite deposits . Ore Geology Reviews 53 : 1 - 25
Fiala J Paděra K ( 1977 ) The chemistry of the minerals of the pyrope dunite from borehole T-7 near Staré (Bohemia) . Tschermaks...
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Sm-Nd ISOTOPIC DATA FOR TSAVORITES, TANZANITES, AND V-F-TREMOLITE FROM THE ... Available to Purchase
in Age and Origin of the Tsavorite and Tanzanite Mineralizing Fluids in the Neoproterozoic Mozambique Metamorphic Belt
> The Canadian Mineralogist
Published: 01 July 2017
TABLE 1. Sm-Nd ISOTOPIC DATA FOR TSAVORITES, TANZANITES, AND V-F-TREMOLITE FROM THE DEPOSITS OF TANZANIA, MADAGASCAR, AND KENYA
Image
MICROTHERMOMETRIC AND RAMAN DATA FOR THE SELECTED TYPES OF SECONDARY FLUID ... Available to Purchase
in Age and Origin of the Tsavorite and Tanzanite Mineralizing Fluids in the Neoproterozoic Mozambique Metamorphic Belt
> The Canadian Mineralogist
Published: 01 July 2017
TABLE 5. MICROTHERMOMETRIC AND RAMAN DATA FOR THE SELECTED TYPES OF SECONDARY FLUID INCLUSIONS FOUND IN THE STUDIED TSAVORITES FROM THE MERELANI DEPOSIT (TANZANIA)
Image
Ternary V–Cr–Mn diagram presenting the five chemical types of worldwide tsa... Available to Purchase
in New typology and origin of tsavorite based on trace-element chemistry
> European Journal of Mineralogy
Published: 01 March 2014
Fig. 5 Ternary V–Cr–Mn diagram presenting the five chemical types of worldwide tsavorite defined by their trace-element composition. Distribution of the chemical composition by countries and deposits.
Book Chapter
THE GEOLOGY OF GEMS AND THEIR GEOGRAPHIC ORIGIN Available to Purchase
Series: Short Courses
Publisher: Mineralogical Association of Canada
Published: 01 January 2014
DOI: 10.3749/9780921294696.ch03
EISBN: 978-0-921294-69-6
... includes most emerald (~70%), ruby (~10%), alexandrite and demantoid (~40 %) deposits. Metamorphic type (Me) is divided into two fields ( Fig. 3-2 ): (Me1), the metamorphic deposits s.s., i.e., corundum in marble, mafic–ultramafic rocks (M–UM), granulite and gneiss, tsavorite in nodule-bearing...
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Image
Sulfur isotopic composition (δ 34 S in ‰ V-CDT) of Tanzanian sulfide minera... Available to Purchase
in Age and Origin of the Tsavorite and Tanzanite Mineralizing Fluids in the Neoproterozoic Mozambique Metamorphic Belt
> The Canadian Mineralogist
Published: 01 July 2017
Fig. 4. Sulfur isotopic composition (δ 34 S in ‰ V-CDT) of Tanzanian sulfide minerals from graphitic rocks (gneisses and calc-silicates) hosting tsavorite and tanzanite and from overlying marbles (Lelatema fold belt and Ruangwa deposits). Ranges of isotopic composition for various systems
Journal Article
The Geochemistry of Gems and Its Relevance to Gemology: Different Traces, Different Prices Available to Purchase
Journal: Elements
Publisher: Mineralogical Society of America
Published: 01 June 2009
Elements (2009) 5 (3): 159–162.
... oxygen to the metal ion also contributes to the color. F igure 1 ( A ) The tsavorite variety of grossular garnet owes its color to the substitution in the Al site of about a percent level of V 3+ usually accompanied by a lesser amount of Cr 3+ . This stone weighs 7.4 carats. ( B...
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