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Androy Volcanic Complex, Madagascari
Regional Level Types
Androy Volcanic ComplexComplex
MadagascarCountry

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Type:
Complex
Age:
123.2 Β± 12 to 90.5 Β± 9 Ma
Geologic Time:
Cretaceous
Dating method:
K-Ar
Reference for age:
Andriamirado, R. 1971. Geochronologique de quelques formations volcaniques 'Cretacees' de Madagascar. Comptes Rendus de la Semaine Geologique 1970. Comite National Malgache de Geologie, 53-54.
Mindat Locality ID:
374442
Long-form identifier:
mindat:1:2:374442:3
GUID (UUID V4):
4bd3f026-5b8d-444e-a63f-3ca4629db242
Other Languages:
French:
Volcan de l'Androy Complex, Madagascar


A Cretaceous volcanic complex, 4000km2 large in the southeastern part of Madagascar. It consist of a > 2000m thick sequence of basalt and phenocryst-poor rhyolite lavas.
Large volcanic complex consists predominantly of basalts and rhyolites with (according to Besairie 1957) late dikes of ankaratrite (nephelinite).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

10 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

β“˜ Albite
Formula: Na(AlSi3O8)
References:
(2008)
β“˜ Albite var. Andesine
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
References:
(2008)
β“˜ Albite var. Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
References:
(2008)
β“˜ Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
References:
(2008)
β“˜ Calcite
Formula: CaCO3
References:
(2008)
β“˜ 'Chlorite Group'
References:
(2008)
β“˜ 'Clinopyroxene Subgroup'
References:
(2008)
β“˜ 'Fayalite-Forsterite Series'
References:
(2008)
β“˜ 'Feldspar Group'
β“˜ 'Feldspar Group var. Perthite'
β“˜ Ferro-edenite
Formula: NaCa2Fe2+5(Si7Al)O22(OH)2
References:
(2008)
β“˜ Ilmenite
Formula: Fe2+TiO3
References:
(2008)
β“˜ Magnesiochromite
Formula: MgCr2O4
References:
(2008)
β“˜ Magnetite
Formula: Fe2+Fe3+2O4
References:
(2008)
β“˜ Magnetite var. Titanium-bearing Magnetite
Formula: Fe2+(Fe3+,Ti)2O4
References:
(2008)
β“˜ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
References:
(2008)
β“˜ 'Pyroxene Group'
Formula: ADSi2O6
References:
(2008)
β“˜ Quartz
Formula: SiO2
References:
(2008)
β“˜ Sanidine
Formula: K(AlSi3O8)
References:
(2008)
(2008)
β“˜ Zircon
Formula: Zr(SiO4)
References:
(2008)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
β“˜Ilmenite4.CB.05Fe2+TiO3
β“˜Magnesiochromite4.BB.05MgCr2O4
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
β“˜var. Titanium-bearing Magnetite4.BB.05Fe2+(Fe3+,Ti)2O4
β“˜Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
Group 9 - Silicates
β“˜Albite9.FA.35Na(AlSi3O8)
β“˜var. Andesine9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
β“˜var. Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
β“˜Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
β“˜Ferro-edenite9.DE.15NaCa2Fe2+5(Si7Al)O22(OH)2
β“˜Sanidine9.FA.30K(AlSi3O8)
β“˜Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
β“˜'Chlorite Group'-
β“˜'Clinopyroxene Subgroup'-
β“˜'Fayalite-Forsterite Series'-
β“˜'Feldspar Group'-
β“˜'var. Perthite'-
β“˜'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
β“˜'Pyroxene Group'-ADSi2O6

List of minerals for each chemical element

HHydrogen
Hβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
CCarbon
Cβ“˜ CalciteCaCO3
OOxygen
Oβ“˜ SanidineK(AlSi3O8)
Oβ“˜ QuartzSiO2
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ ZirconZr(SiO4)
Oβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oβ“˜ Pyroxene GroupADSi2O6
Oβ“˜ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oβ“˜ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Oβ“˜ MagnesiochromiteMgCr2O4
Oβ“˜ CalciteCaCO3
Oβ“˜ AlbiteNa(AlSi3O8)
Oβ“˜ IlmeniteFe2+TiO3
Oβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Oβ“˜ Albite var. Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Oβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
NaSodium
Naβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Naβ“˜ AlbiteNa(AlSi3O8)
Naβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Naβ“˜ Albite var. Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Naβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
MgMagnesium
Mgβ“˜ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mgβ“˜ MagnesiochromiteMgCr2O4
AlAluminium
Alβ“˜ SanidineK(AlSi3O8)
Alβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Alβ“˜ AlbiteNa(AlSi3O8)
Alβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Alβ“˜ Albite var. Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Alβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
SiSilicon
Siβ“˜ SanidineK(AlSi3O8)
Siβ“˜ QuartzSiO2
Siβ“˜ ZirconZr(SiO4)
Siβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Siβ“˜ Pyroxene GroupADSi2O6
Siβ“˜ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siβ“˜ AlbiteNa(AlSi3O8)
Siβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Siβ“˜ Albite var. Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Siβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
KPotassium
Kβ“˜ SanidineK(AlSi3O8)
CaCalcium
Caβ“˜ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Caβ“˜ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caβ“˜ CalciteCaCO3
Caβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
Caβ“˜ Albite var. Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Caβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
TiTitanium
Tiβ“˜ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Tiβ“˜ IlmeniteFe2+TiO3
CrChromium
Crβ“˜ MagnesiochromiteMgCr2O4
FeIron
Feβ“˜ MagnetiteFe2+Fe23+O4
Feβ“˜ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feβ“˜ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Feβ“˜ IlmeniteFe2+TiO3
Feβ“˜ Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
ZrZirconium
Zrβ“˜ ZirconZr(SiO4)

Geochronology

Mineralization age: Late/Upper Cretaceous : 86.3 Β± 2.0 Ma to 84.4 Β± 1.0 Ma

Important note: This table is based only on rock and mineral ages recorded on mindat.org for this locality 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
Phanerozoic
 Mesozoic
  Cretaceous
   Late/Upper Cretaceous
β“˜ Sanidine84.4 Β± 1.0 Ma
β“˜ Dolerite86.3 Β± 2.0 Ma

Fossils

This region is too big or complex to display the fossil list, try looking at smaller subregions.

Localities in this Region

Madagascar

Other Regions, Features and Areas that Intersect

Somali PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Andriamirado, R. 1971. Geochronologique de quelques formations volcaniques 'Cretacees' de Madagascar. Comptes Rendus de la Semaine Geologique 1970. Comite National Malgache de Geologie, 53-54.
(n.d.)
(n.d.)
(n.d.)
Storey, M, Mahoney, J., Saunders, A.D. , Duncan, R.A., Kelley, S.P., Coffin, M.F. (1995) Timing of hotspot-related volcanism and the breakup of Madagascar and India, Science, 267, 852 -855
(2001)
(2008)
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