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Petrology Of Intrusive Rocks Of Oban Massif, Southeastern Nigeria 尼日利亚东南部奥班丘陵的侵入岩岩石学

Global Journal of Geological Sciences Pub Date : 2024-01-16 DOI: 10.4314/gjgs.v21i2.2

Edem Grace O, Ekwueme Barth N, Ephraim Bassey E

{"title":"Petrology Of Intrusive Rocks Of Oban Massif, Southeastern Nigeria","authors":"Edem Grace O, Ekwueme Barth N, Ephraim Bassey E","doi":"10.4314/gjgs.v21i2.2","DOIUrl":"https://doi.org/10.4314/gjgs.v21i2.2","url":null,"abstract":"A total of forty- nine (49) fresh rock samples of the various intrusive rocks (granitoids and dolerites)were collected from the field. These rocks intruded metamorphic rocks that include pyllites, schists, gneisses and amphibolites in the Oban Massif. Intrusive rocks pegmatitic granites and granodiorite exhibit porphyritic texture rich in feldspars, quartz, muscovite, biotite, tourmaline and beryl. The granodiorite contains xenoliths of metamorphic rocks. The dolerites are ophitic and composed of plagioclase, olivine and pyroxene. From the geochemical analyses, the intrusive rocks show SiO2 to be the most abundant chemical component in all the rock units with its highest value recorded in the pegmatitic granite (Av. 70.07%), while the lowest value (59.68%) recorded in the dolerite. Al2O3 also display high concentration in rocks of Oban Massif. The rocks have concentrations of Al2O3> (CaO + Na2O + K2O), low MgO, and TiO2 concentrations while pegmatitic granites exhibit low concentration in FeOTotal. The alkaline and calc-alkaline, granitoid intrusives in the study area were found to be I-type crustal orogenic granitoids that represent a late stage intrusion along major shear and thrust zones.The results of trace elements analysis revealed that almost all the intrusive rocks of Oban Massif contain high Ba content, the highest values occur in the pegmatitic granite with a mean concentration of (2266ppm), while meladiorite was found to contain the least amount of Ba (44ppm). \u0000 \u0000 \u0000 ","PeriodicalId":486435,"journal":{"name":"Global Journal of Geological Sciences","volume":"25 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140506223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Size Distribution And Heavy Mineral Pattern In Some E Gbe Streams, Southwestern Nigeria 尼日利亚西南部一些 E Gbe 溪流的粒度分布和重金属形态

Global Journal of Geological Sciences Pub Date : 2024-01-16 DOI: 10.4314/gjgs.v21i2.7

Aderogbin Joseph Ayofe, Umoh Ekaete E, Falana Olukayode Adeyinka

{"title":"Size Distribution And Heavy Mineral Pattern In Some E Gbe Streams, Southwestern Nigeria","authors":"Aderogbin Joseph Ayofe, Umoh Ekaete E, Falana Olukayode Adeyinka","doi":"10.4314/gjgs.v21i2.7","DOIUrl":"https://doi.org/10.4314/gjgs.v21i2.7","url":null,"abstract":"The Egbe-Isanlu schist belt has received scholarly attention from several researchers but there is no documented report on types and the distribution of heavy minerals in streams of the area. This study is intended to reveal the types of heavy minerals, the distribution and possible source rocks to guide prospectors in gems. The study area lies within latitude 08o 03' and 08o 16 ' and longitude 05o 31' and 05o 43’ of the Southwestern Basement Complex terrain in Nigeria. Fifteen stream sediment samples were collected at appropriate points along river channels, air dried at room temperature, sieved and subjected to heavy mineral separation process using bromoform. Graphic mean, sorting, skewness and kurtosis were determined and heavy minerals identified under microscope. The graphic mean ranges between 0.67 (coarse sand) to 2.49 (fine sand), skewness between 0.75 and -0.10 and Kurtosis between 0.87 and 1.88. The calculated ZTR index ranges between 6.86% and 3.35.0%. The identified heavy minerals in the study area included tourmaline, epidote, rutile, zircon, kyanite, staurolite, garnet and zeolite. These minerals are modernly distributed across the sampled area and in some locations, they are relatively high in abundance. Some of the heavy minerals are angular to sub-angular in shape suggesting a short distance of travel from source. The graphic mean gives values that suggests a moderately to poorly sorted sediment and skewness indicated a platykurtic and leptokurtic nature for the sediments. Calculated ZTR index classified the sediments as immature to sub-mature indicating a short distance of travel suggesting that the sediments could have been derived within the catchment area. The presence of zircon, tourmaline and rutile suggests that the sediments might probably have its source from acid intrusive rocks and pegmatites. \u0000 \u0000 \u0000 ","PeriodicalId":486435,"journal":{"name":"Global Journal of Geological Sciences","volume":"41 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140506023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0