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Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascari
Regional Level Types
Samiresy- not defined -
TritrivaCommune
BetafoDistrict
VakinankaratraRegion
MadagascarCountry

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Samiresy pegmatite

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
Samiresy

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
Strüverite

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
Samiresy pegmatite

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
Samiresy

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
Strüverite

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
Samiresy pegmatite

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
Samiresy

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
Name in Malagasy:Samiresy, Kaominin'i Tritriva, Distrikan'i Betafo, Vakinankaratra, Madagasikara
Latitude & Longitude (WGS84): 19° 58' 9'' South , 46° 52' 53'' East
Latitude & Longitude (decimal): -19.96943,46.88141
GeoHash:G#: mh3q6udj8
Köppen climate type:Cwb : Subtropical highland climate or temperate oceanic climate with dry winters
Nearest Settlements:
PlacePopulationDistance
Betafo29,785 (2018)15.5km
Antsirabe186,253 (2018)19.6km
Soanindrariny21,000 (2018)37.6km


The locality Samiresy covers a number of pegmatite dikes (classified as potassic pegmatites after A. Lacroix 1922) worked for minerals containing U, beryl and rose quartz.

It is located SW of Tritriva and about 20 km SW of the town Antsirabe in the main highland of Madagascar.

One of these dikes is the type locality of the now discredited "samiresite", a plumbian uranpyrochlore.

Regions containing this locality

Somali Plate (Somalia Plate)Plate
Antananarivo Province, MadagascarProvince (Abolished)

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


22 valid minerals.

Detailed Mineral List:

ⓘ Beryl
Formula: Be3Al2(Si6O18)
ⓘ 'Biotite'
ⓘ Bismite
Formula: Bi2O3
ⓘ Bismuth
Formula: Bi
Bismuthinite, etc.

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
ⓘ Bismuthinite
Formula: Bi2S3
ⓘ Bismutite
Formula: (BiO)2CO3
ⓘ Columbite-(Fe)
Formula: Fe2+Nb2O6
ⓘ Dravite
Formula: Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Euxenite-(Y)

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
ⓘ Euxenite-(Y)
Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
ⓘ Goethite
Formula: α-Fe3+O(OH)
ⓘ Hematite
Formula: Fe2O3
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Monazite-(Ce)
Formula: Ce(PO4)
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ 'Psilomelane'
ⓘ Pucherite
Formula: Bi(VO4)
ⓘ 'Pyrochlore Group'
Formula: A2Nb2(O,OH)6Z
ⓘ Pyromorphite
Formula: Pb5(PO4)3Cl
ⓘ Quartz
Formula: SiO2
ⓘ Quartz var: Rose Quartz
Formula: SiO2
ⓘ Rutile
Formula: TiO2
ⓘ Rutile var: Ilmenorutile
Formula: Fex(Nb,Ta)2x · 4Ti1-xO2
Strüverite

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
ⓘ Rutile var: Strüverite
Formula: (Ti,Ta,Fe)O2
ⓘ Samarskite-(Y)
Formula: (Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
ⓘ Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘ Spessartine
Formula: Mn2+3Al2(SiO4)3
ⓘ 'Uranpyrochlore (of Hogarth 1977)'
Formula: (Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
Samiresite, etc.

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
ⓘ 'Uranpyrochlore (of Hogarth 1977) var: Samiresite'
Formula: (U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
ⓘ Xenotime-(Y)
Formula: Y(PO4)
Zircon

Samiresy, Tritriva, Betafo, Vakinankaratra, Madagascar
ⓘ Zircon
Formula: Zr(SiO4)

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘBismuth1.CA.05Bi
Group 2 - Sulphides and Sulfosalts
ⓘBismuthinite2.DB.05Bi2S3
Group 4 - Oxides and Hydroxides
ⓘBismite4.CB.60Bi2O3
ⓘColumbite-(Fe)4.DB.35Fe2+Nb2O6
ⓘEuxenite-(Y)4.DG.05(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
ⓘGoethite4.00.α-Fe3+O(OH)
ⓘHematite4.CB.05Fe2O3
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘ'Pyrochlore Group'4.00.A2Nb2(O,OH)6Z
ⓘQuartz4.DA.05SiO2
ⓘvar: Rose Quartz4.DA.05SiO2
ⓘRutile4.DB.05TiO2
ⓘvar: Ilmenorutile4.DB.05Fex(Nb,Ta)2x · 4Ti1-xO2
ⓘvar: Strüverite4.DB.05(Ti,Ta,Fe)O2
ⓘSamarskite-(Y)4.DB.25(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
ⓘ'Uranpyrochlore (of Hogarth 1977)'4.DH.15(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
ⓘ'var: Samiresite'4.DH.15(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
Group 5 - Nitrates and Carbonates
ⓘBismutite5.BE.25(BiO)2CO3
Group 8 - Phosphates, Arsenates and Vanadates
ⓘMonazite-(Ce)8.AD.50Ce(PO4)
ⓘPucherite8.AD.40Bi(VO4)
ⓘPyromorphite8.BN.05Pb5(PO4)3Cl
ⓘXenotime-(Y)8.AD.35Y(PO4)
Group 9 - Silicates
ⓘBeryl9.CJ.05Be3Al2(Si6O18)
ⓘDravite9.CK.05Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘSchorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘSpessartine9.AD.25Mn2+3Al2(SiO4)3
ⓘZircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
ⓘ'Biotite'-
ⓘ'Psilomelane'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
ⓘBismuth1.3.1.4Bi
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:3
ⓘBismuthinite2.11.2.3Bi2S3
Group 4 - SIMPLE OXIDES
A2X3
ⓘBismite4.3.10.2Bi2O3
ⓘHematite4.3.1.2Fe2O3
AX2
ⓘRutile4.4.1.1TiO2
ⓘvar: Ilmenorutile4.4.1.2Fex(Nb,Ta)2x · 4Ti1-xO2
ⓘvar: Strüverite4.4.1.3(Ti,Ta,Fe)O2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
ⓘGoethite6.1.1.2α-Fe3+O(OH)
Group 7 - MULTIPLE OXIDES
AB2X4
ⓘMagnetite7.2.2.3Fe2+Fe3+2O4
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
ABO4
ⓘSamarskite-(Y)8.1.11.1(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
A2B2O6(O,OH,F)
ⓘ'Pyrochlore Group'8.2.1.1A2Nb2(O,OH)6Z
ⓘ'Uranpyrochlore (of Hogarth 1977)'8.2.1.7(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
AB2O6
ⓘColumbite-(Fe)8.3.2.2Fe2+Nb2O6
ⓘEuxenite-(Y)8.3.8.2(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
ⓘBismutite16a.3.5.1(BiO)2CO3
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
AXO4
ⓘMonazite-(Ce)38.4.3.1Ce(PO4)
ⓘPucherite38.4.6.1Bi(VO4)
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
ⓘPyromorphite41.8.4.1Pb5(PO4)3Cl
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
ⓘSpessartine51.4.3a.3Mn2+3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
ⓘZircon51.5.2.1Zr(SiO4)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
ⓘBeryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
ⓘDravite61.3.1.9Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘSchorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
ⓘMuscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
ⓘQuartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
ⓘ'Biotite'-
ⓘ'Psilomelane'-
ⓘQuartz
var: Rose Quartz		-SiO2
ⓘ'Uranpyrochlore (of Hogarth 1977)
var: Samiresite'		-(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
ⓘXenotime-(Y)-Y(PO4)

List of minerals for each chemical element

HHydrogen
Hⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
Hⓘ SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Hⓘ Goethiteα-Fe3+O(OH)
Hⓘ Pyrochlore GroupA2Nb2(O,OH)6Z
Hⓘ Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
BeBeryllium
Beⓘ BerylBe3Al2(Si6O18)
BBoron
Bⓘ SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Bⓘ DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
CCarbon
Cⓘ Bismutite(BiO)2CO3
OOxygen
Oⓘ QuartzSiO2
Oⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
Oⓘ Quartz (var: Rose Quartz)SiO2
Oⓘ SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ SpessartineMn32+Al2(SiO4)3
Oⓘ DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Oⓘ ZirconZr(SiO4)
Oⓘ Xenotime-(Y)Y(PO4)
Oⓘ Monazite-(Ce)Ce(PO4)
Oⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Oⓘ Rutile (var: Ilmenorutile)Fex(Nb,Ta)2x · 4Ti1-xO2
Oⓘ Rutile (var: Strüverite)(Ti,Ta,Fe)O2
Oⓘ PyromorphitePb5(PO4)3Cl
Oⓘ BismiteBi2O3
Oⓘ Goethiteα-Fe3+O(OH)
Oⓘ HematiteFe2O3
Oⓘ PucheriteBi(VO4)
Oⓘ BerylBe3Al2(Si6O18)
Oⓘ Columbite-(Fe)Fe2+Nb2O6
Oⓘ Pyrochlore GroupA2Nb2(O,OH)6Z
Oⓘ Bismutite(BiO)2CO3
Oⓘ Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Oⓘ Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
Oⓘ RutileTiO2
FFluorine
Fⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
Fⓘ Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
NaSodium
Naⓘ SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Naⓘ DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mgⓘ DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
AlAluminium
Alⓘ SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ SpessartineMn32+Al2(SiO4)3
Alⓘ DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Alⓘ BerylBe3Al2(Si6O18)
SiSilicon
Siⓘ QuartzSiO2
Siⓘ Quartz (var: Rose Quartz)SiO2
Siⓘ SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ SpessartineMn32+Al2(SiO4)3
Siⓘ DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Siⓘ ZirconZr(SiO4)
Siⓘ BerylBe3Al2(Si6O18)
PPhosphorus
Pⓘ Xenotime-(Y)Y(PO4)
Pⓘ Monazite-(Ce)Ce(PO4)
Pⓘ PyromorphitePb5(PO4)3Cl
SSulfur
Sⓘ BismuthiniteBi2S3
ClChlorine
Clⓘ PyromorphitePb5(PO4)3Cl
KPotassium
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
Caⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Caⓘ Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Caⓘ Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
TiTitanium
Tiⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Tiⓘ Rutile (var: Ilmenorutile)Fex(Nb,Ta)2x · 4Ti1-xO2
Tiⓘ Rutile (var: Strüverite)(Ti,Ta,Fe)O2
Tiⓘ Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
Tiⓘ RutileTiO2
VVanadium
Vⓘ PucheriteBi(VO4)
MnManganese
Mnⓘ SpessartineMn32+Al2(SiO4)3
FeIron
Feⓘ SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ Rutile (var: Ilmenorutile)Fex(Nb,Ta)2x · 4Ti1-xO2
Feⓘ Rutile (var: Strüverite)(Ti,Ta,Fe)O2
Feⓘ Goethiteα-Fe3+O(OH)
Feⓘ HematiteFe2O3
Feⓘ Columbite-(Fe)Fe2+Nb2O6
Feⓘ Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
YYttrium
Yⓘ Xenotime-(Y)Y(PO4)
Yⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Yⓘ Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
ZrZirconium
Zrⓘ ZirconZr(SiO4)
NbNiobium
Nbⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
Nbⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Nbⓘ Rutile (var: Ilmenorutile)Fex(Nb,Ta)2x · 4Ti1-xO2
Nbⓘ Columbite-(Fe)Fe2+Nb2O6
Nbⓘ Pyrochlore GroupA2Nb2(O,OH)6Z
Nbⓘ Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Nbⓘ Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
CeCerium
Ceⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
Ceⓘ Monazite-(Ce)Ce(PO4)
Ceⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Ceⓘ Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
TaTantalum
Taⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
Taⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Taⓘ Rutile (var: Ilmenorutile)Fex(Nb,Ta)2x · 4Ti1-xO2
Taⓘ Rutile (var: Strüverite)(Ti,Ta,Fe)O2
Taⓘ Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Taⓘ Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)
PbLead
Pbⓘ PyromorphitePb5(PO4)3Cl
BiBismuth
Biⓘ BismuthBi
Biⓘ BismiteBi2O3
Biⓘ BismuthiniteBi2S3
Biⓘ PucheriteBi(VO4)
Biⓘ Bismutite(BiO)2CO3
ThThorium
Thⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Thⓘ Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
UUranium
Uⓘ Uranpyrochlore (of Hogarth 1977) (var: Samiresite)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
Uⓘ Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Uⓘ Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Uⓘ Uranpyrochlore (of Hogarth 1977)(Ca,U,Ce)2(Nb,Ti,Ta)2O6(OH,F)

Geochronology

Mineralization age: Tonian : 915 ± 72 Ma

Important note: This table is based only on rock and mineral ages recorded below and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
Precambrian
 Proterozoic
  Neoproterozoic
   Tonian
ⓘ Samiresite915 ± 72 Ma

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cambrian - Neoproterozoic
485.4 - 1000 Ma



ID: 3306770

Age: Neoproterozoic to Cambrian (485.4 - 1000 Ma)

Lithology: Plutonic

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

Ectasian - Calymmian
1200 - 1600 Ma



ID: 3184647
Mesoproterozoic crystalline metamorphic rocks

Age: Mesoproterozoic (1200 - 1600 Ma)

Lithology: Crystalline metamorphic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Lacroix, A. (1922) Minéralogie de Madagascar, Tome I. Géologie-Minéralogie descriptive. A. Challamel (Éditeur), Paris. 624 p.
Ranorosoa, N. (1986) Étude minéralogique des pegmatites du champ de la Sahatany, Madagascar. Thèse de Doctorat de l'Université Paul Sabatier, Toulouse.


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