The study area received less attention from earlier workers which they consider the rocks as older granites that were barren, but according to this research work the rocks were found to be among the metamorphic terrain specifically migmatite rocks formed as part of northeastern Nigerian basement complex rocks which was affected by series of orogenic cycles that undergoes regional metamorphism and intrusion of younger granite rocks occurred sporadically in the study area. Detailed field mapping and sampling was done in order to identify and record the physical features of the rocks. Petrographic studies were conducted in both plane polarised light and cross polarised light in which microscopic structures were identified and noted. Field investigations and petrographic studies reveal that the rocks in the study area are metamorphic rocks based on certain structures observed, some of the structures include ptygmatic folding, crenulation cleavage, pinch and swell, andulus extinction and pleuchroic halo which are characteristics of metamorphic rocks. Therefore, the area was found to be underlaid by migmatite rocks which were classified as banded orthogneiss, straumalitic, and nebulitic migmatites and some intrusion of younger granites. Tin, tantalite, tourmaline and corundum mineralization were inferred.
Table of Contents
1. INTRODUCTION
2. Literature Review
3. Materials and Methods
3.1 Field Method
3.2 Petrographic analysis
3.3 Software interpretations
4. Discussion of Results
4.2 Petrographic Results
5. Conclusion
Research Objectives and Topics
The primary objective of this research is to analyze the morphology and field relationships of rock units within the Kariya area in Bauchi State, Nigeria, to determine their geological composition and deformation history. The study utilizes field mapping and petrographic analysis to characterize the basement complex rocks and identify mineralogical features.
- Geological mapping of the Kariya study area
- Petrographic classification of migmatites and granite rocks
- Identification of deformation structures such as ptygmatic folding and foliation
- Evaluation of mineralogical compositions and metamorphic indicators
- Assessment of potential mineralization zones including tin, tantalite, and tourmaline
Excerpt from the Book
1. INTRODUCTION
The study area is located around Kariya village, Ganjuwa local government area, Bauchi State, northeastern Nigeria and within the basement complex of Nigeria where little or no research attention was given. This research work revealed that the rocks formed from series of orogenic cycles that have undergone metamorphism. The basement rocks around Kariya area consist of different varieties of migmatite rocks which occurs in association with younger granites sporadically intruded within the study area along the fractured zone, especially around Gadan Maiwa, Jangu and Kawari areas. Pegmatite dykes, lodes and some occur horizontally as sills along foliation planes in anisotropic areas; also, quartz ridges were observed at some places like Kariyan Gachi, Bakwi and Kariya.
The rocks in the study area have undergone polycyclic deformation thereby causing the formation of both micro and macro structures. Secondary structures (foliations, folds, micro faults, joints, quartz veins, fractures, ptygmatic folding) in the rocks can be used as clues to determine geologic history of the area. The structures in the area are mostly trending N-S and NE-SW conforming to the Pan African structures; some structures are believed to be syntectonic (the foliation planes) which are E-W in their orientation. The pressure-temperature conditions of metamorphism appear to vary from place to place as displayed by the rock units observed in the area during the field work, where intensity of shear stress caused various deformation effects on the rocks in the study area.
Summary of Chapters
1. INTRODUCTION: Provides an overview of the geographical location, the lack of previous research in the Kariya area, and the general geological setting of the region.
2. Literature Review: Outlines the regional geological framework, specifically focusing on the Pan-African orogeny and the classification of the Nigerian basement complex.
3. Materials and Methods: Details the methodologies employed, including field mapping, petrographic laboratory analysis, and the use of geospatial software for data interpretation.
4. Discussion of Results: Discusses the field observations of various rock types and details the specific mineralogical findings obtained through microscopic analysis.
5. Conclusion: Summarizes the findings, confirming the prevalence of migmatite rocks and the identification of specific mineralogical associations and tectonic deformation features.
Keywords
Kariya, Nigeria, migmatite, granite, petrography, metamorphism, polycyclic deformation, shear stress, ptygmatic folding, foliation, mineralization, basement complex, Pan-African, orthogneiss, field mapping
Frequently Asked Questions
What is the core focus of this research?
The study investigates the geological morphology and field relationships of rock units situated in the Kariya region of Bauchi State, Nigeria.
What are the primary geological features identified in the study?
The research identifies various types of migmatites, younger granites, and pegmatite intrusions, along with deformation structures such as folds, joints, and foliation planes.
What is the main objective of this study?
The objective is to characterize the rocks in the study area to understand their metamorphic history and identify potential mineral occurrences.
Which scientific methods were used to conduct the research?
The researchers performed detailed field mapping, petrographic microscopic analysis of rock samples, and utilized software such as ArcGIS and Global Mapper for geological mapping.
What topics are covered in the main body of the paper?
The paper covers the regional geological background, specific field observations of rock structures, detailed microscopic mineral analysis, and the classification of the migmatite units.
How are the key terms defining this study?
The study is characterized by geological terms such as migmatite, Pan-African orogeny, deformation structures, and petrographic identification.
How do the researchers differentiate between the migmatite types?
They differentiate them based on structural characteristics and mineral assemblages, identifying groups such as banded orthogneiss, straumatic, and nebulitic migmatites.
What role does shear stress play in the study area?
The study concludes that shear stress has significantly impacted the region, resulting in deformation effects observed both in field outcrops and through microscopic wavy extinction in quartz.
- Arbeit zitieren
- Idris Ismail Kariya (Autor:in), 2019, Morphology and Field Relationship of Kariya Rocks, Ganjuwa L.G.A. Bauchi, Northeast Nigeria, München, GRIN Verlag, https://www.grin.com/document/499910
