INTERPRETATION OF THE AEROMAGNETIC ANOMALIES CVER THE YOUNGER GRANITES OF JOS-PANKSHIN AREA IN PLATEAU STAIE, NIGERIA
INTERPRETATION OF THE AEROMAGNETIC ANOMALIES CVER THE YOUNGER GRANITES OF JOS-PANKSHIN AREA IN PLATEAU STAIE, NIGERIA
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Date
1984-10
Authors
KANGKOLO, ROLAND
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Abstract
A prepared residual magnetic field map of the
central part of Jos Plateau revealed that most of .
the significant magnetic anomalies correlate with
known geology features However, at least
seven prominent anomalies c o u l d not be correlated with
any exposed geological features, These anomalies
were attributed to be buried structures.
Quantitative three-dimensional magnetic i n t e r pretation
of four of the uncorrelated anomalies
were made. The models obtained indicate that the
anomalies arise from bodies of negative susceptibility
contrast (-0.00078 emu to -0.00425 emu) with respect
to the basement; most of these bodies were flanked
by other bodies with positive susceptibility contrasts
(+0,000625 emu to +0.00152 emu). Values of the
suscepbility contrast (-0.00078 emu to -0.00425 emu)
indicate the former bodies as being Younger Granite
rock-types and the latter as being basalts or basic
rocks.
The buried structures in the eastern half of
the area and some of the exposed Younger Granite
massifs form NNW alignments which are parallel to
structural tends in the basement complex in
this region.
The models indicate that the buried structures
are located at an average depth of 1km below the
surface, extend to between 3km and 14km, and have
near-vertical sides and polygonal cross-SE ctions.
These shapes conform with the concept of the origin
of Younger Granites from cauldron subsidence in
magma chambers within the crust.
Description
SUBMITTED IN PARTIAL FULFILLMENT OF THE
REQUIREMENTS FOR THE DEGREE OF MASTER
OF SCIENCE, APPLIED GEOPHYSICS.
DEPARTMENT
OF PHYSICS
AHMADU EELLO UNIVERSITY
ZARIA-NIGERIA. ,
OCTOBER, 1984
Keywords
INTERPRETATION, AEROMAGNETIC,, ANOMALIES,, CVER,, YOUNGER,, GRANITES,, JOS-PANKSHIN,, PLATEAU STATE, NIGERIA.