Journal of Earth Science & Climatic Change
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The granitoids of the northern part of Adamawa Massif in northeastern Nigeria have been differentiated based of field and
petrochemical data into granodiorite and granites. Although there are slight mineralogical and geochemical differences
between the granodiorite and the granites (e.g Rb/Sr ratios lower in granodiorite than the granites), the two rock units have
similar geochemical characteristics. The rocks are characterized by a wide range in SiO
, Calc-alkaline affinity, syn- to within-
plate granite signatures, metaluminous to peraluminouss composition and more K
O-rich and hypersthenes-poor comparable
to fractionated I-type granitoids. The rocks display slightly fractionated to fractionated LREE, almost flat HREE patterns, with
significant negative EU and Ba anomalies, Linear major element trends and progressive rise in SiO
O, Rb and Rb/Sr ratios
with depleting MgO, Fe
, CaO, TiO
, Sr and Ba consistent with removal of plagioclase during fractionation of basic melts
to yield silicic magma. This linear trend is reflected in the normative mineralogy where orthoclase and quartz increase from
granodiorite to the granites whereas other minerals behave in a reverse manner.
Based on field and petrochemical features, the granodiorites and the granites of south Adamawa Massif are I-type,
generated in a syn- to within-plate collision-related tectonic setting and genetically related to a common source by fractional
crystallization dominated by the removal from the melt hornblende, plagioclase, biotite, K-feldspar and accessory phases such
as apatie, epidote and zircon.
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