GENESIS OF TOURMALINIZATION IN DUTSEN DANBAKOSHI AREA, SHEET 56 (MUSAWA S.E) N.W NIGERIA

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dc.contributor.authorGEZAWA, Jamilu Garba
dc.date.accessioned2014-06-12T08:28:24Z
dc.date.available2014-06-12T08:28:24Z
dc.date.issued2013-03
dc.descriptionA THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY ZARIA, IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF A THE DEGREE OF MASTER OF SCIENCE IN GEOLOGY DEPARTMENT OF GEOLOGY, FACULTY OF SCIENCE AHMADU BELLO UNIVERSITY, ZARIA NIGERIA MARCH, 2013en_US
dc.description.abstractField mapping in Dutsen Danbakoshi was carried out using topographical map of Musawa SE sheet 56 on a scale 1: 50, 000 and the quartz-tourmaline ridges were further mapped on a scale of 1: 10, 000 to study it in a more detail. Petrographic studies were conducted using both transmitted and reflected light microscope. The geochemical analysis of 21 representative samples was carried out using X-ray fluorescence, inductively coupled sector field mass spectrometry and mass spectrometry. Field mapping reveals that the area is underlain by Older Granite, Metasandstone, and Diorite as the major rock types. Quartz-tourmaline ridges occur as minor intrusive. These rocks have been deformed; sheared with the joints trending N-S to NNE-SSW, which coincided with the pattern of the Pan-African basement structures. Petrographic studies have shown that the granites are composed of quartz, microcline and biotite as major minerals; the Diorite is composed of plagioclase, hornblende, quartz and biotite. The Metasandstone consists mainly of quartz and feldspar. The quartz–tourmaline is principally composed of tourmaline and quartz. Geochemical and isotopic analyses results show that SiO2 in granites to be 72.71-67.30 wt%, diorite 48.38-38.90 wt% and quartz-tourmaline 57.97-35.41 wt% while K2O in granite 6.98-4.43 wt%; diorite 1.08-0.02 wt% and quartz-tourmaline 0.01-0.19 wt%. The trace element composition shows enrichment of Sr (1200-0.036 ppm), Rb (319-0.038 ppm), Ba (1000-0.04 ppm). The rare earth elements in the samples show enrichment in La (87.9-12 ppm), Nd (64.1- 9.5 ppm), Ce (163-0.11 ppm), Eu (1.66-0.13 ppm), Tb (1.5-0.3 ppm), Ho (1.6-0.3 ppm), Lu (0.68-0.11 ppm), and boron isotope (σ 11B) in the quartz-tourmaline ranges from -15.84‰ - 17.92‰ vii Various discrimination diagrams were used to classify the rock types and their tectonic settings. The granites plot in syncollisional field. Based on REE distribution pattern and their enrichment of LREE and depletion of HREE, they are of continental or crustal origin. The negative Eu anomaly is probably indicating the formation of both the host rocks (granite and diorite) and quartz-tourmaline in Upper Proterozoic metasedimentary environment. The negative Ce anomaly is signifying the formation of quartz-tourmaline under oxidizing conditions. The host rocks (granite and diorite) and quartz-tourmaline are both enriched in LREE and depleted in HREE with negative Eu anomaly indicating syngenetic relationship. Boron isotope values (σ 11B) of quartz-tourmaline ranges from (– 15.84‰ to – 17.92‰) thus signifying continental or crustal origin of the boron enriched residual fluids which led to the tourmalinization and also indicating possible dual provenance of tourmaline to be high pressure metamorphic rocks or granite and pegmatite. The boron isotope values also suggest that the granitoids from which the B enrich residual fluids were generated were probably originated as a result of the reworking of preexisting basement complex rocks.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/4862
dc.language.isoenen_US
dc.subjectGENESIS,en_US
dc.subjectTOURMALINIZATION,en_US
dc.subjectDUTSEN,en_US
dc.subjectDANBAKOSHI,en_US
dc.subjectNIGERIAen_US
dc.titleGENESIS OF TOURMALINIZATION IN DUTSEN DANBAKOSHI AREA, SHEET 56 (MUSAWA S.E) N.W NIGERIAen_US
dc.typeThesisen_US
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