Application of ZTR Index in the Assessment of Maturity of Stream Sediments in Akinmorin Area, Southwestern Nigeria
Abstract
Ten sediment samples were collected from streams in Akinmorin, southwestern Nigeria, and analyzed in order to determine the types and abundance of heavy minerals present, assess their maturity and infer their provenance. Furthermore, a total of three representative rock samples were collected from the area for essential mineral analysis.Heavy minerals separation was carried out usingbromoform, while thin sections of the rocksamples were prepared andexamined under the petrographic microscope. Heavy minerals identified are Zircon, Tourmaline, Rutile, Sillimanite, Garnet, and Staurolite.The abundance of zircon in the sediments range from 296 to 9, Tourmaline range from115 to 5, Rutile range from 26 to 4, Garnet range from187 to 31, while Staurolite range from 53 to 0. The ZTR Index for the sediments range from 20.83 to 70.18.Modal analysis revealed minerals composition in banded gneiss as quartz (47.1%), plagioclase feldspar (29.4%), and biotite (23.5%); granite gneiss as quartz (27.4%), plagioclase feldspar (29.9%),biotite (25.6%), and hornblende (17.1%) while in biotite-garnet-gneiss; quartz (20.9%), plagioclase feldspar (25.1%), orthoclase feldspar (0.84%%),biotite (52.2%), and garnet (1.04%).The presence of Zircon, Tourmaline, Rutile, Sillimanite, Garnet and Stauroliteindicate mixed sources of acid igneous and medium to high grade metamorphic rocks for the stream sediments, while the range of ZTR index is an indication of a mineralogically immature to sub-mature sediments, a short transport history and provenance. These results show that the stream sediments of Akinmorin area originated from the surrounding basement rocks.
Keywords
Granitoids, Heavy minerals, Mineralogical maturity, Provenance, Stream sediments, ZTR Index.
Citations
IRE Journals:
ADEROGBIN Joseph Ayofe , ISIBOR Roland Anthony
"Application of ZTR Index in the Assessment of Maturity of Stream Sediments in Akinmorin Area, Southwestern Nigeria" Iconic Research And Engineering Journals Volume 3 Issue 11 2020 Page 98-107
IEEE:
ADEROGBIN Joseph Ayofe , ISIBOR Roland Anthony
"Application of ZTR Index in the Assessment of Maturity of Stream Sediments in Akinmorin Area, Southwestern Nigeria" Iconic Research And Engineering Journals, 3(11)
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