Morphological classification and Mineral Potential of Migmatites in Zongor area, north eastern Nigeria based on Geology and Petrographic Studies.

Bridget Oshilike, A. Haruna, N. Muhammad, A. Isa
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Abstract

This study examines the different morphologies of migmatites in the Zongor area, north eastern Nigeria, based on field and petrological evidences. Field relationship exposes rocks around the Zongor area as dominated by a complex suite of migmatites that have undergone different stages of metamorphism. In some parts of the area, structures such as layering and foliation are seen to have been preserved during partial melting, whereas in other parts, these structures appear to have been completely consumed during anatexis to form new structures. This discrepancy in the field occurrence of migmatites in the area, in line with recent development in studies on migmatites has shed more insight into the classification of the migmatites in the study area. Rock samples from the field are sorted into groups. Representative rock samples from these groups are studied under thin section. The occurrence of high temperature minerals like garnet, orthopyroxene, plagioclases, olivine, and hornblende are indicative of high-grade metamorphism. Results from field and petrographic studies are compared with results from the works . Using his first- and second-order classification scheme as a guide for the morphological classification of the migmatites in the area, the migmatites are grouped into metatexite and diatexites. The geologic conditions and mode of occurrence of the migmatites in the Zongor area are studied in order to understand the tectonic history of the area and its implication for mineral occurrence.
基于地质岩石学研究的尼日利亚东北部宗戈尔地区混辉岩形态分类及找矿潜力
在野外和岩石学资料的基础上,研究了尼日利亚东北部宗戈尔地区混合岩的不同形态。野外关系表明宗格尔地区周围的岩石主要是一套复杂的混杂岩,经历了不同阶段的变质作用。在该地区的某些地区,分层和叶理等结构在部分熔融过程中被保存下来,而在其他地区,这些结构似乎在熔融过程中被完全消耗,形成了新的结构。该区混混岩野外产状的差异,与近年来混混岩研究的进展相一致,为该区混混岩的分类提供了新的思路。从野外采集的岩石样本被分类成组。在薄片下对这些组的代表性岩石样品进行了研究。石榴石、正辉石、斜长石、橄榄石、角闪石等高温矿物的赋生表现为高变质作用。野外和岩石学研究结果与工程研究结果进行了比较。以他的一、二级分类体系为指导,该区混混岩的形态分类分为偏长岩和斜长岩。为了解宗戈尔地区的构造历史及其对矿物赋存的指示意义,对宗戈尔地区混合岩的地质条件和赋存方式进行了研究。
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