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Paper Number: 19
GEOLOGICAL
MAPPING, STRUCTURAL SETTING AND PETROGRAPHIC DESCRIPTION OF THE ARCHEAN
VOLCANIC ROCKS OF MNANKA AREA, NORTH MARA, TANZANIA.
Author: Kavana, E
1Acacia
Mining PLC, Technical Services, Department of Geology, P. O. Box 75864,
Dar es Salaam, Tanzania, East Africa. Email: ezrakavana2@gmail.com
ABSTRACT
The Mnanka area is situated within the Musoma Mara Greenstone Belt,
the area is near to Nyabigena, Gokona and Nyabirama Gold mines. Mnanka
area comprises of the sequence of predominant rhyolitic volcanic rocks,
chert and metasediments. Gold mineralizations in Mnanka area is
structure controlled and occur mainly as hydrothermal disseminated
intrusion related deposits. Hence the predominant observed structures
are joints and flow banding. Measurements from flow banding plotted on
stereonets using win-TENSOR software has provided an estimate for the
general strike of the area lying 070o to 100o
dipping at an average range angle of 70o to 85o
while data from joints plotted on stereonets suggest multiple
deformation events one of which conforms to the East Africa Rift System
(striking WSW-ENE, NNE-SSW and N-S).
Keywords: Musoma Mara Greenstone Belt, Mnanka
volcanics, Archaean rocks and lithology.
References:
[1] Gerard Tripp et al., 2007 Geological assessment of the
Gokona/Nyabigena gold deposit, 10-16
[2] Dr. Andrew Allibone, March-April 2000. Regional Geologic Mapping
in the North Mara Region, 15-20
[3] Ikingura et al., 2010 Atlas of Gold Deposits in Tanzania. Dar es
Salaam: DUP, 88 pp.
