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首页> 外文期刊>Arabian Journal of Geosciences >Integration of remote sensing data with the field and laboratory investigation for lithological mapping of granitic phases: Kadabora pluton, Eastern Desert, Egypt
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Integration of remote sensing data with the field and laboratory investigation for lithological mapping of granitic phases: Kadabora pluton, Eastern Desert, Egypt

机译：将遥感数据与现场相结合并进行实验室调查以对花岗岩相进行岩性作图：Kadabora岩体，埃及东部沙漠

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摘要

In the current study, an integration of Enhanced Thematic Mapper Plus (ETM+), field, and laboratory data have been used for lithological mapping of different granitic phases in the Kadabora area, Eastern Desert, Egypt. Application of enhancement techniques, including a new proposed band ratio combination (ratio 5/3, 3/1, 7/5 in RGB, respectively) and supervised classification images are used in discriminating different granitic phases in the Kadabora pluton from each other and from their environs. The data have been proved with the help of field and geochemical investigations. The results revealed that: (1) the Kadabora granitic pluton could be distinguished into three phases that recognized by field and laboratory investigation including granodiorite (phase I), monzogranite (phase II), and syeno-alkali feldspar granite (phase III). These phases are arranged according to their relative ages while the country rocks include ophiolitic mélange and metagabbro–diorite complex. It is also confirmed that the granitic pluton is invaded by dyke swarms which is trending in N–S direction. Geochemically, results show that the granodiorite is calc-alkaline, I-type and formed under subduction tectonic regime. Monzogranite falls within the alkaline and highly fractionated calc-alkaline granites, whereas syeno-alkali feldspar granite extends into proper alkaline granitoids field. Monzogranite and syeno-alkali feldspar granite belong to the A2-subtype granite. This A2-subtype granite was probably formed in an extensional regime, subsequent to subduction which can lead to tensional break-up of the crust (i.e., post-collisional, post-orogenic granites). The monzogranite and the syeno-alkali feldspar granite were probably formed by partial melting of relatively anhydrous lower crust source and/or tonalite to granodiorite is viable alternative to the granulite source.
机译：在当前的研究中，增强的专题测绘仪增强版（ETM +），野外和实验室数据的集成已用于埃及东部沙漠卡达博拉地区不同花岗岩相的岩性制图。增强技术的应用，包括新提出的带宽比组合（分别为RGB的比率5 / 3、3 / 1、7 / 5）和监督分类图像，用于区分Kadabora岩体和彼此之间的不同花岗岩相。他们的周围。数据已在现场和地球化学调查的帮助下得到了证明。结果表明：（1）Kadabora花岗岩岩体可分为三个阶段，这三个阶段已为野外和实验室研究所认可，包括花岗闪长岩（第一阶段），单长花岗岩（第二阶段）和均碱-长石花岗岩（第三阶段）。这些阶段是根据其相对年龄排列的，而乡村岩石包括脂滑混杂岩和变质闪长岩复合体。还可以确认，花岗岩岩体被堤坝群侵袭，堤坝群沿N–S方向发展。地球化学结果表明，该花岗闪长岩为钙碱性，I型，在俯冲构造条件下形成。 Monzogranite属于碱性和高分度的钙碱性花岗岩，而syeno-alkali长石花岗岩则延伸到适当的碱性花岗岩领域。 Monzogranite和syeno-alkali长石花岗岩属于A2 亚型花岗岩。这种A2 -亚型花岗岩可能是在俯冲之后以伸展形式形成的，这可能导致地壳的张力破裂（即碰撞后，造山后的花岗岩）。 Monzogranite和syeno-alkali长石花岗岩可能是通过将相对无水的下部地壳和/或方钠石部分熔融成花岗闪石而形成的，可以替代花岗石来源。

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