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Chikangawa Intrusion, Nkhata Bay, Northern Region, Malawii
Regional Level Types
Chikangawa IntrusionIntrusion
Nkhata BayDistrict
Northern RegionRegion
MalawiCountry

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Latitude & Longitude (WGS84):
11° 52' 0'' South , 33° 47' 59'' East
Latitude & Longitude (decimal):
-11.86667,33.80000
GeoHash:
G#: kvbh3psrt
GRN:
S08E24
Locality type:
Intrusion
Age:
650 Β± 40 Ma
Geologic Time:
Cryogenian
Dating method:
Rb-Sr whole rock
Reference for age:
Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37.
KΓΆppen climate type:
Cwa : Monsoon-influenced humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Mzimba19,308 (2011)22.1km
Mzuzu175,345 (2013)50.6km
Nkhata Bay11,721 (2011)60.7km


6.5 x 4.5 km intrusion is emplaced in gneisses and consists of nepheline syenites that vary widely in grain size, degree of foliation and presence or absence of mafic banding (Bloomfield 1965; Gaskell 1973).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


10 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 List Tree Diagram

Detailed Mineral List:

β“˜ Albite
Formula: Na(AlSi3O8)
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ Albite var. Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ 'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ Calcite
Formula: CaCO3
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ Cancrinite
Formula: (Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ 'Feldspar Group'
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ Magnetite
Formula: Fe2+Fe3+2O4
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ Microcline
Formula: K(AlSi3O8)
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ Nepheline
Formula: Na3K(Al4Si4O16)
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ Pyrite
Formula: FeS2
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ 'Pyrochlore Group'
Formula: A2Nb2(O,OH)6Z
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ Pyrrhotite
Formula: Fe1-xS
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
β“˜ Zircon
Formula: Zr(SiO4)
Reference: Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63. Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5. Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37. SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Pyrite2.EB.05aFeS2
β“˜Pyrrhotite2.CC.10Fe1-xS
Group 4 - Oxides and Hydroxides
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
β“˜'Pyrochlore Group'4.00.A2Nb2(O,OH)6Z
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
Group 9 - Silicates
β“˜Albite9.FA.35Na(AlSi3O8)
β“˜var. Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
β“˜Cancrinite9.FB.05(Na,Ca,β—»)8(Al6Si6O24)(CO3,SO4)2 Β· 2H2O
β“˜Microcline9.FA.30K(AlSi3O8)
β“˜Natrolite9.GA.05Na2Al2Si3O10 Β· 2H2O
β“˜Nepheline9.FA.05Na3K(Al4Si4O16)
β“˜Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
β“˜'Apatite'-Ca5(PO4)3(Cl/F/OH)
β“˜'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
β“˜'Feldspar Group'-

List of minerals for each chemical element

HHydrogen
Hβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Hβ“˜ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Hβ“˜ NatroliteNa2Al2Si3O10 · 2H2O
Hβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
Hβ“˜ Pyrochlore GroupA2Nb2(O,OH)6Z
CCarbon
Cβ“˜ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Cβ“˜ CalciteCaCO3
OOxygen
Oβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ AlbiteNa(AlSi3O8)
Oβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Oβ“˜ NephelineNa3K(Al4Si4O16)
Oβ“˜ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Oβ“˜ NatroliteNa2Al2Si3O10 · 2H2O
Oβ“˜ CalciteCaCO3
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ ZirconZr(SiO4)
Oβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
Oβ“˜ Pyrochlore GroupA2Nb2(O,OH)6Z
FFluorine
Fβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Fβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Naβ“˜ AlbiteNa(AlSi3O8)
Naβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Naβ“˜ NephelineNa3K(Al4Si4O16)
Naβ“˜ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Naβ“˜ NatroliteNa2Al2Si3O10 · 2H2O
MgMagnesium
Mgβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
AlAluminium
Alβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ AlbiteNa(AlSi3O8)
Alβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Alβ“˜ NephelineNa3K(Al4Si4O16)
Alβ“˜ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Alβ“˜ NatroliteNa2Al2Si3O10 · 2H2O
SiSilicon
Siβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ AlbiteNa(AlSi3O8)
Siβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Siβ“˜ NephelineNa3K(Al4Si4O16)
Siβ“˜ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Siβ“˜ NatroliteNa2Al2Si3O10 · 2H2O
Siβ“˜ ZirconZr(SiO4)
PPhosphorus
Pβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
Sβ“˜ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Sβ“˜ PyriteFeS2
Sβ“˜ PyrrhotiteFe1-xS
ClChlorine
Clβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
Kβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Kβ“˜ MicroclineK(AlSi3O8)
Kβ“˜ NephelineNa3K(Al4Si4O16)
CaCalcium
Caβ“˜ Albite var. Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
Caβ“˜ Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Caβ“˜ CalciteCaCO3
Caβ“˜ ApatiteCa5(PO4)3(Cl/F/OH)
TiTitanium
Tiβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
FeIron
Feβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Feβ“˜ MagnetiteFe2+Fe23+O4
Feβ“˜ PyriteFeS2
Feβ“˜ PyrrhotiteFe1-xS
ZrZirconium
Zrβ“˜ ZirconZr(SiO4)
NbNiobium
Nbβ“˜ Pyrochlore GroupA2Nb2(O,OH)6Z

Geochronology

Mineralization age: Early/Lower Devonian : 410 Β± 16 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
 Paleozoic
  Devonian
   Early/Lower Devonian
β“˜ Biotite410 Β± 16 Ma

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Woolley, A. R. (2001). Alkaline rocks and carbonatites of the world. Part 3: Africa. Geological Society. Natural History Museum, London, p. 161.
Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63.
Bloomfield, K. (1968). The pre-Karoo geology of Malawi. Memoir, Geological Survey of Malawi, 5.
Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37.
SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.

Other Regions, Features and Areas containing this locality

Africa
African 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.
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