Source Rock Studies of Ogunniyi Sediments and Percentage of Ztr Minerals in its Environs

Abstract

Ogunniyi area had been studied to obtaininformation on the heavy mineral presence in the location using binocular microscope and sieving equipment for analysesand separated in funnel by means of bromoform with specific gravity of approximately 2.89. The heavy minerals present in lithologic sand units are mainly opaque and Zircon-Tourmaline-Rutile (ZTR) minerals and staurolite. Other heavy minerals like hornblende and topaz were also recorded but in little quantity. The most dominant non-opaque mineral is tourmaline with 32.73%
of the total non-opaque minerals counted in the area. Tourmaline is very noticeable in locations OG11 and is present is five out of six examined locations.Other ZTR minerals like zircon and rutile contributed 25.45% and 18.18% respectively of the total sum of non-opaque heavy minerals. The mineralogical index has been determined to be 76.36% which indicates that the sediments are matured since the value is greater than 75.00%. The index is commonly high in beach or littoral zone depositional environment due to the long transport distances from the source and the high energy of the environment. Moreso, the sediments are sourced from porphyroblastic schists (which are foliated rocks) of medium grade regional metamorphic rock and granite (felsic) of acidic igneous rock.