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Biotite from
Chikangawa Intrusion, Nkhata Bay, Northern Region, Malawi


Locality type:Intrusion
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Age information
Maximum recorded age:410 ± 16 Ma
Minimum recorded age:410 ± 16 Ma
Sample ages:
Recorded ageGeologic TimeSampleDating method
1410 ± 16 MaEarly/Lower Devonian - K-Ar
Sample references:
1 -
SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Chikangawa Intrusion, Nkhata Bay, Northern Region, Malawi
Data Identifiers
Mindat Occurrence Record ID:1429122
Long-form Identifier:1:3:1429122:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
15.0km (9.3 miles) ⓘMbuliwiza pegmatite, Mzimba, Northern Region, Malawi
55.0km (34.2 miles) ⓘChampirar Dome, Mzimba, Northern Region, Malawi
References
Bloomfield, K. (1965). A reconnaissance survey of alkaline rocks in the northern and central regions. Records, Geological Survey of Malawi, 5, 17-63.
SNELLING, N. J. (1965). Age determination unit. Annual Report of the Overseas geological Surveys, 28-38.
Bloomfield, K. (1968) The pre-Karoo geology of Malawi - Geological Survey of Malawi, Memoir Vol. 5. 166 pp.
Gaskell, J. L. (1973). The geology of the Mzimba area. Bulletin, Geological Survey of Malawi, 37.
 
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