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Mahafaly dike swarm, Fotadrevo, Ampanihy District, Atsimo-Andrefana, Madagascari
Regional Level Types
Mahafaly dike swarmDike swarm
FotadrevoCommune
Ampanihy DistrictDistrict
Atsimo-AndrefanaRegion
MadagascarCountry

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Latitude & Longitude (WGS84):
24° 15' South , 44° 57' East
Latitude & Longitude (decimal):
-24.25000,44.95000
GeoHash:
G#:kgxync7td
GRN:
S17E29
Type:
Dike swarm
Köppen climate type:
Aw : Tropical savanna, wet
Mindat Locality ID:
407338
Long-form identifier:
mindat:1:2:407338:6
GUID (UUID V4):
b3020cbd-f6d2-4608-a4b6-055f3d71448c


Extensive dolerite dike swarm, apparently associated with which are 10 small plugs (Boulanger 1957), all of which consist of ankaratrite.

Select Mineral List Type

StandardDetailedGalleryStrunzChemical Elements

Mineral List


3 valid minerals.

Rock Types Recorded

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

Select Rock List Type

Alphabetical ListTree Diagram

Detailed Mineral List:

ⓘAnalcime
Formula:Na(AlSi2O6) · H2O
References:
Boulanger, J. 1957. Les dykes du pays Mahafaly. Travaux du Bureau Geologique. Haut Commissariat de Madagascar et Dependances, Service Geologique, Tananarive, 83, 101-112.
Lacroix, Alfred (1923)Minéralogie de Madagascar Tome 3 - Lithologie Appendice - Index Geographique. Société d'Éditions Géographiques, Maritimes et Coloniales, Paris. p.1-450.
Boulanger, J. (1957). Le systeme volcanique fissural du pays Mahafaly (SW de Madagascar). Bulletin de la Société Géologique de France, 6(4-5), 529-537. doi.org/10.2113/gssgfbull.S6-VII.4-5.529
Besaire, Henri (1970) Feuille 7. Fianarantsoa. 1:500000.Carte géologigues Madagascar 1/500.000, Service Geologique de Madagascar.
Dostal, J., Dupuy, C., Nicollet, C., Cantagrel, J.M. (1992) Geochemistry and petrogenesis of Upper Cretaceous basaltic rocks from southern Malagasy.Chemical Geology, 97 (3) 199-218doi:10.1016/0009-2541(92)90076-h
ⓘAugite
Formula:(CaxMgyFez)(Mgy1Fez1)Si2O6
References:
Boulanger, J. 1957. Les dykes du pays Mahafaly. Travaux du Bureau Geologique. Haut Commissariat de Madagascar et Dependances, Service Geologique, Tananarive, 83, 101-112.
Lacroix, Alfred (1923)Minéralogie de Madagascar Tome 3 - Lithologie Appendice - Index Geographique. Société d'Éditions Géographiques, Maritimes et Coloniales, Paris. p.1-450.
Boulanger, J. (1957). Le systeme volcanique fissural du pays Mahafaly (SW de Madagascar). Bulletin de la Société Géologique de France, 6(4-5), 529-537. doi.org/10.2113/gssgfbull.S6-VII.4-5.529
Besaire, Henri (1970) Feuille 7. Fianarantsoa. 1:500000.Carte géologigues Madagascar 1/500.000, Service Geologique de Madagascar.
Dostal, J., Dupuy, C., Nicollet, C., Cantagrel, J.M. (1992) Geochemistry and petrogenesis of Upper Cretaceous basaltic rocks from southern Malagasy.Chemical Geology, 97 (3) 199-218doi:10.1016/0009-2541(92)90076-h
ⓘ'Fayalite-Forsterite Series'
References:
Boulanger, J. 1957. Les dykes du pays Mahafaly. Travaux du Bureau Geologique. Haut Commissariat de Madagascar et Dependances, Service Geologique, Tananarive, 83, 101-112.
Lacroix, Alfred (1923)Minéralogie de Madagascar Tome 3 - Lithologie Appendice - Index Geographique. Société d'Éditions Géographiques, Maritimes et Coloniales, Paris. p.1-450.
Boulanger, J. (1957). Le systeme volcanique fissural du pays Mahafaly (SW de Madagascar). Bulletin de la Société Géologique de France, 6(4-5), 529-537. doi.org/10.2113/gssgfbull.S6-VII.4-5.529
Besaire, Henri (1970) Feuille 7. Fianarantsoa. 1:500000.Carte géologigues Madagascar 1/500.000, Service Geologique de Madagascar.
Dostal, J., Dupuy, C., Nicollet, C., Cantagrel, J.M. (1992) Geochemistry and petrogenesis of Upper Cretaceous basaltic rocks from southern Malagasy.Chemical Geology, 97 (3) 199-218doi:10.1016/0009-2541(92)90076-h
ⓘNepheline
Formula:Na3K(Al4Si4O16)
References:
Boulanger, J. 1957. Les dykes du pays Mahafaly. Travaux du Bureau Geologique. Haut Commissariat de Madagascar et Dependances, Service Geologique, Tananarive, 83, 101-112.
Lacroix, Alfred (1923)Minéralogie de Madagascar Tome 3 - Lithologie Appendice - Index Geographique. Société d'Éditions Géographiques, Maritimes et Coloniales, Paris. p.1-450.
Boulanger, J. (1957). Le systeme volcanique fissural du pays Mahafaly (SW de Madagascar). Bulletin de la Société Géologique de France, 6(4-5), 529-537. doi.org/10.2113/gssgfbull.S6-VII.4-5.529
Besaire, Henri (1970) Feuille 7. Fianarantsoa. 1:500000.Carte géologigues Madagascar 1/500.000, Service Geologique de Madagascar.
Dostal, J., Dupuy, C., Nicollet, C., Cantagrel, J.M. (1992) Geochemistry and petrogenesis of Upper Cretaceous basaltic rocks from southern Malagasy.Chemical Geology, 97 (3) 199-218doi:10.1016/0009-2541(92)90076-h
ⓘ'Pyroxene Group'
Formula:ADSi2O6
References:
Boulanger, J. 1957. Les dykes du pays Mahafaly. Travaux du Bureau Geologique. Haut Commissariat de Madagascar et Dependances, Service Geologique, Tananarive, 83, 101-112.
Lacroix, Alfred (1923)Minéralogie de Madagascar Tome 3 - Lithologie Appendice - Index Geographique. Société d'Éditions Géographiques, Maritimes et Coloniales, Paris. p.1-450.
Boulanger, J. (1957). Le systeme volcanique fissural du pays Mahafaly (SW de Madagascar). Bulletin de la Société Géologique de France, 6(4-5), 529-537. doi.org/10.2113/gssgfbull.S6-VII.4-5.529
Besaire, Henri (1970) Feuille 7. Fianarantsoa. 1:500000.Carte géologigues Madagascar 1/500.000, Service Geologique de Madagascar.
Dostal, J., Dupuy, C., Nicollet, C., Cantagrel, J.M. (1992) Geochemistry and petrogenesis of Upper Cretaceous basaltic rocks from southern Malagasy.Chemical Geology, 97 (3) 199-218doi:10.1016/0009-2541(92)90076-h

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates
ⓘAugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘNepheline9.FA.05Na3K(Al4Si4O16)
ⓘAnalcime9.GB.05Na(AlSi2O6) · H2O
Unclassified
ⓘ'Fayalite-Forsterite Series'-
ⓘ'Pyroxene Group'-ADSi2O6

List of minerals for each chemical element

HHydrogen
HⓘAnalcimeNa(AlSi2O6) · H2O
OOxygen
OⓘAnalcimeNa(AlSi2O6) · H2O
OⓘAugite(CaxMgyFez)(Mgy1Fez1)Si2O6
OⓘNephelineNa3K(Al4Si4O16)
OⓘPyroxene GroupADSi2O6
NaSodium
NaⓘAnalcimeNa(AlSi2O6) · H2O
NaⓘNephelineNa3K(Al4Si4O16)
MgMagnesium
MgⓘAugite(CaxMgyFez)(Mgy1Fez1)Si2O6
AlAluminium
AlⓘAnalcimeNa(AlSi2O6) · H2O
AlⓘNephelineNa3K(Al4Si4O16)
SiSilicon
SiⓘAnalcimeNa(AlSi2O6) · H2O
SiⓘAugite(CaxMgyFez)(Mgy1Fez1)Si2O6
SiⓘNephelineNa3K(Al4Si4O16)
SiⓘPyroxene GroupADSi2O6
KPotassium
KⓘNephelineNa3K(Al4Si4O16)
CaCalcium
CaⓘAugite(CaxMgyFez)(Mgy1Fez1)Si2O6
FeIron
FeⓘAugite(CaxMgyFez)(Mgy1Fez1)Si2O6

Geochronology

Mineralization age:Late/Upper Cretaceous : 71 ± 3 Ma to 66 ± 1 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
 Cenozoic
  Paleogene
   Paleocene
ⓘ Basanite (youngest age)66 ± 1 Ma
 Mesozoic
  Cretaceous
   Late/Upper Cretaceous
ⓘ Basanite (oldest age)71 ± 3 Ma

Other Regions, Features and Areas containing this locality

African Plate
Madagascar
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, pleaseregister so you can add to our database. This locality information is for reference purposes only. You should never attempt tovisit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holdersfor access and that you are aware of all safety precautions necessary.

References

Boulanger, J. 1957. Les dykes du pays Mahafaly. Travaux du Bureau Geologique. Haut Commissariat de Madagascar et Dependances, Service Geologique, Tananarive, 83, 101-112.
Lacroix, Alfred (1923)Minéralogie de Madagascar Tome 3 - Lithologie Appendice - Index Geographique. Société d'Éditions Géographiques, Maritimes et Coloniales, Paris. p.1-450.
Boulanger, J. (1957). Le systeme volcanique fissural du pays Mahafaly (SW de Madagascar). Bulletin de la Société Géologique de France, 6(4-5), 529-537. doi.org/10.2113/gssgfbull.S6-VII.4-5.529
Besaire, Henri (1970) Feuille 7. Fianarantsoa. 1:500000.Carte géologigues Madagascar 1/500.000, Service Geologique de Madagascar.
Dostal, J., Dupuy, C., Nicollet, C., Cantagrel, J.M. (1992) Geochemistry and petrogenesis of Upper Cretaceous basaltic rocks from southern Malagasy.Chemical Geology, 97 (3) 199-218doi:10.1016/0009-2541(92)90076-h
Woolley, A. R. (2001)Alkaline Rocks and Carbonatites of the World, Part 3: Africa - Alkaline Rocks and Carbonatites of the World. The Geological Society of London.
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