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Geochemical Trends in Weathering Profiles and Their Underlying Precambrian Basement Rocks in Akure, Southwestern Nigeria DOI:  https://doi.org/10.30564/jees.v3i2.3308 Abstract Akure area in southwestern Nigeria falls within the basement complex underlain by migmatite, quartzite granite and charnockite. Geochemical features of these crystalline rocks and their overlying in-situ weathering profiles are investigated and reported. Analytical result from ICP-MS facility at the University of Malaya reveals average SiO 2  content in quartzite (91.1%), granite (73.8%), migmatite (67.4%) and charnockite (58.6%) categorize the rocks as siliceous. SiO 2  contents in the weathering profiles above these rocks are 61.9%, 60.2%, 52.2% and 54.6% respectively. Alumina contents in the weathering profiles overlying quartzite (23.8%), granite (19.9%), migmatite (26.3%) and charnockite (24.3%) are substantially higher than the precursor rocks. In the same order, average alkali (Na 2 O+K 2 O) ...

Geochemical Trends in Weathering Profiles and Their Underlying Precambrian Basement Rocks in Akure, Southwestern Nigeria DOI:  https://doi.org/10.30564/jees.v3i2.3308 Abstract Akure area in southwestern Nigeria falls within the basement complex underlain by migmatite, quartzite granite and charnockite. Geochemical features of these crystalline rocks and their overlying in-situ weathering profiles are investigated and reported. Analytical result from ICP-MS facility at the University of Malaya reveals average SiO 2  content in quartzite (91.1%), granite (73.8%), migmatite (67.4%) and charnockite (58.6%) categorize the rocks as siliceous. SiO 2  contents in the weathering profiles above these rocks are 61.9%, 60.2%, 52.2% and 54.6% respectively. Alumina contents in the weathering profiles overlying quartzite (23.8%), granite (19.9%), migmatite (26.3%) and charnockite (24.3%) are substantially higher than the precursor rocks. In the same order, average alkali (Na 2 O+K 2 O) ...

Geochemical Trends in Weathering Profiles and Their Underlying Precambrian Basement Rocks in Akure, Southwestern Nigeria DOI:  https://doi.org/10.30564/jees.v3i2.3308 Abstract Akure area in southwestern Nigeria falls within the basement complex underlain by migmatite, quartzite granite and charnockite. Geochemical features of these crystalline rocks and their overlying in-situ weathering profiles are investigated and reported. Analytical result from ICP-MS facility at the University of Malaya reveals average SiO 2  content in quartzite (91.1%), granite (73.8%), migmatite (67.4%) and charnockite (58.6%) categorize the rocks as siliceous. SiO 2  contents in the weathering profiles above these rocks are 61.9%, 60.2%, 52.2% and 54.6% respectively. Alumina contents in the weathering profiles overlying quartzite (23.8%), granite (19.9%), migmatite (26.3%) and charnockite (24.3%) are substantially higher than the precursor rocks. In the same order, average alkali (Na 2 O+K 2 O) ...

  Keywords: Akure Nigeria Geochemical trends In-situ weathering profile Kaolinitic ABSTRACT Akure area in southwestern Nigeria falls within the basement complex  underlain by migmatite, quartzite granite and charnockite. Geochemical  features of these crystalline rocks and their overlying in-situ weathering  profiles are investigated and reported. Analytical result from ICP-MS  facility at the University of Malaya reveals average SiO2 content in  quartzite (91.1%), granite (73.8%), migmatite (67.4%) and charnockite  (58.6%) categorize the rocks as siliceous. SiO2 contents in the weathering  profiles above these rocks are 61.9%, 60.2%, 52.2% and 54.6%  respectively. Alumina contents in the weathering profiles overlying  quartzite (23.8%), granite (19.9%), migmatite (26.3%) and charnockite  (24.3%) are substantially higher than the precursor rocks. In the same  order, average alkali (Na2O+K2O) contents in the profiles are 3.38%, ...