Rare earth element and stable sulphur (δ 34S) isotope study of baryte–copper mineralization in Gulani area, Upper Benue Trough, NE Nigeria

El-Nafaty, J.M.

doi:10.1016/j.jafrearsci.2015.03.007

Cited by 9 publications

(10 citation statements)

References 17 publications

(22 reference statements)

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“…The sandstone was devoid of Eu anomalies indicating that their original material is from different sources. El-Nafaty [5] studied the REE of baryte mineralization of Gulani area and observed that distal samples were characterized by high LREE and lower values of HREE similar to those of this study. The REE pattern of the proximal samples samples (hydrothermally altered granite, pegmatite and sandstone) show enriched LREE and depleted HREE for the granites, but erratic pattern in the sandstones with significant negative Eu anomalies which reflects depletion of feldspars during crystal-melt segregation due to the effect of hyrothermal fluid intrusion into the host lithologies.…”

Section: Discussionsupporting

confidence: 80%

“…The above values are much higher than those of Joseph et al [7] who reported stable sulphur isotope values that ranged from +5 o /oo -19 o /oo CDT for pyrite of Gombe hill, pointing to fresh water sulphate as the source of sulphur. The values reported in this work are somehow higher than those obtained on the Gulani baryte separates which range from 12.3 o /oo to 13.1 o /oo which attributed the source of the sulphur to formational waters [5].…”

Section: Stable Sulphur Isotope Studycontrasting

confidence: 68%

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Rare earth elements and stable sulphur (δ34s) isotope of baryte mineralization in Liji Area, Northern Benue trough, northeastern Nigeria

Kamale¹,

El-Nafaty²,

Umaru³

et al. 2020

Nig. J. Tech.

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The Liji area lithologically consists of inliers of granite and pegmatite members of the Pan-African granitoids surrounded by Cretaceous sedimentary deposits of Bima, Yolde, Pindiga and Gombe Formations. Epigenetic fracture-filling baryte mineralization hosted by granite, pegmatite and Bima Sandstone were delineated, sampled and analyzed for rare-earth elements (REEs) and stable sulphur isotope geochemistry. The REEs of the distal (unaltered) rocks indicated normal values (26.15-36.81 ppm) before mineralization was marked by enrichment of light rare-earth elements (LREEs) (27.94 ppm) relative to the heavy rare-earth elements (HREEs) (5.34 ppm) and negative Eu anomalies typical of calc-alkaline granites of Pan-African age. The baryte separates were marked by enriched LREEs and depleted HREEs with pronounced positive Eu anomalies indicating the invasion and consequent deposition of baryte-rich hydrothermal fluid under oxidizing conditions in the N-S and E-W striking fractures. Stable sulphur isotope of the baryte gives values that ranged from 18.3 - 19.8o/oo CDT indicating that the source of sulphur is from ocean water and not from magmatic, fresh water and connate water sources from the nearby granite, pegmatite and sandstone. Keywords: Baryte, Mineralization, Hydrothermal, Liji, REE, Sulphur-Isotope.

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Section: Discussionsupporting

confidence: 80%

Section: Stable Sulphur Isotope Studycontrasting

confidence: 68%

Rare earth elements and stable sulphur (δ34s) isotope of baryte mineralization in Liji Area, Northern Benue trough, northeastern Nigeria

Kamale¹,

El-Nafaty²,

Umaru³

et al. 2020

Nig. J. Tech.

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“…Eighty nine (89) representative rock samples from the various rock units including those of the mineralization areas were thin sectioned for transmitted light microscopy. In addition ten (10) polished block sections of Cu mineralized granites were prepared for reflected light ore microscopy. Both the polished and thin sections were prepared at the Laboratory of the Department of Geology, Ahmadu Bello University, Zaria, Nigeria.…”

Section: Methodsmentioning

confidence: 99%

Untitled

2017

IOSR JAGG

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The geology of Gulani area is composed of Precambrian basement complex of the Older Granite suit (diorite and granites), the Cretaceous sediments of Bima, Yolde and Pindiga Formations and the Tertiary/Quaternary basalts of the Biu Plateau. Epigenetic barite-copper mineralization with barite associated with sandstones and copper occurring in granites have been mapped in the area. Unaltered (distal), hydrothermally altered (proximal) host rocks and barite and chalcopyrite/malachite mineral separates were sampled and investigated petrographically and geochemically for their trace element abundances. Reflected light microscopy of the Cu-mineralized granites show that chalcopyrite constitutes the primary sulphide veins/veinlets materials which altered to malachite and its associated limonite through the processes of hydrolysis and oxidation. Trace element geochemistry reveals that barite mineralization areas are characterized by remarkable enrichment of Ba and Sr and depletion of Rb from the distal sandstones through the proximal sandstones to the barite vein materials where the Ba content is >500,000 ppm (>50%). In the copper mineralization areas, Cu is enriched to values >10,000 ppm (>1%) in the copper mineralized granites and chalcopyrite/malachite separate. However, the Cu mineralization is accompanied by depletion of Ba, Sr and Rb and enrichments of Ag, U, V, Zr, Pb and Y.There are therefore, remarkable contrasts in respect of the trace elements behavior and abundances between barite and copper mineralization areas probably due to the variations in fluids origin, fluids and host rock compositions (sandstones and granites), the chemical activities (intensities) and temperatures of the hydrothermal fluids responsible for the deposition of barite and copper deposits.

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“…Appreciable deposits of barytes occur in Gombe, Liji hills, Gban and Moyo-Kpoki areas (MMSD, 2008 andEl-Nafaty, 2015).…”

Section: Upper Benue Troughmentioning

confidence: 99%

“…Further exploration activities revealed additional areas with favourable geological setting for baryte mineralization namely: Liji Hill, Gombe Town, Ganye, Suwa and Sabin areas northeast Nigeria in addition to Dareta, Tofa Forest Reserve, Rebeku and Yarkatsina areas in northwestern Nigeria. In Nigeria, baryte occurs within the Precambrian Basement and Cretaceous sedimentary rocks as vein infilling materials closely associated with lead-zinc mineralization (Nwozor and Chukwunenye, 2008;MMSD, 2008;Daspan and Imagbe 2010;Ekwueme and Akpeke, 2012;Fatoye, et al, 2014;El-Nafaty, 2015).…”

Section: Introductionmentioning

confidence: 99%

Review of the occurrence and structural controls of Baryte resources of Nigeria

Labe

Ogunleye

Ibrahim

et al. 2018

J.Degrade.Min.Land Manage.

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Baryte occurrences in Nigeria are spread across the Cretaceous Benue Trough which comprises of carbonaceous shales, limestone, siltstones, sandstones as well as in the northeastern, northwestern and southeastern parts of the Precambrian Basement Complex comprising of metasediments and granitoids. The mineralization is structurally controlled by NW-SE, N-S and NE-SW fractures. The common mode of occurrence for these barytes is the vein and cavity deposits type usually associated with galena, sphalerite, copper sulphide, fluorite, quartz, iron oxide as gangue minerals. Principal areas of baryte occurrences in Nigeria include Nassarawa,

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Rare earth element and stable sulphur (δ 34S) isotope study of baryte–copper mineralization in Gulani area, Upper Benue Trough, NE Nigeria

Cited by 9 publications

References 17 publications

Rare earth elements and stable sulphur (δ34s) isotope of baryte mineralization in Liji Area, Northern Benue trough, northeastern Nigeria

Rare earth elements and stable sulphur (δ34s) isotope of baryte mineralization in Liji Area, Northern Benue trough, northeastern Nigeria

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Review of the occurrence and structural controls of Baryte resources of Nigeria

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