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Integration of remote-sensing, structural, and geochemical data for characterizing granitoid rocks in Um Naggat pluton, Central Eastern Desert, Egypt
Arabian Journal of Geosciences ( IF 1.827 ) Pub Date : 2021-01-09 , DOI: 10.1007/s12517-020-06274-x
Nassir Al-Arifi , Gamal Kamal El-Din , Mohamed Abdelkareem , Fathy Abdalla

Integration of remotely-sensed data, field work in addition to geochemical and mineral chemistry analyses, indicates that the Um Naggat granite pluton (UNP) has distinctive lithologic and structural characteristics. Image transformation techniques of using Landsat-8 Operational Land Imager (OLI) data successfully discriminated lithologic characteristics and highlighted hydrothermally altered areas. Shuttle Radar Topography Mission (SRTM) and OLI data allowed highlighting the structural contacts and revealed that the dominant structural trends are NW-SE, NE-SW, and N-S. Petrographic examination, field, and structural survey results revealed that the (UNP) pluton consists of biotite alkali feldspar granite (BAFG) and alkali granite (AG) in addition to a hybrid granite zone (HGZ). The BAFG phase is dominated by an alkaline suite with composition ranging from granite to alkali feldspar granite and pertains to post-orogenic granite (POG) and within-plate granites (WPG). The AG represents the youngest alkali granite phase of magmatism in the studied pluton. Various enclaves from diorites and microgranites have been recorded within the HGZ. Field relationships confirmed with quantitative analysis of magmatic fabric measurements indicate that the AG granitic phase was emplaced as subparallel-elongated sheets or dike-like masses trending E-W and associated with an extensional regime overprinted by the right-lateral strike-slip regime. This phase of “within plate” hypersolvus granite has excessive of large-ion lithophile (LIL) and high field strength (HFS) elements such as Zr, Nb, and Ga that belongs to A-type granites, being depicted by elevated alkali composition and high Fe2O3t/(Fe2O3t +MgO) ratios, and excessive amount of Zr, Y, Nb, and Ga. Microprobe analysis reveals that the compositions of amphibole mineral in the HGZ extent from magnesio-hornblende to actinolite and the temperature of the plagioclase range from 900 to 1050 °C, while the plagioclase of the BAFG is extremely pure albite in composition.



中文翻译:

结合遥感,结构和地球化学数据,表征埃及中东部沙漠Um Naggat岩体中的花岗岩岩石

结合遥感数据,现场工作以及地球化学和矿物化学分析,表明Um Naggat花岗岩岩体(UNP)具有独特的岩性和结构特征。使用Landsat-8 Operational Land Imager(OLI)数据的图像转换技术成功地区分了岩性特征并突出显示了热液蚀变的区域。穿梭雷达地形任务(SRTM)和OLI数据突出显示了结构接触,并揭示了主要的结构趋势是NW-SE,NE-SW和NS。岩石学检查,现场和结构调查结果表明,(UNP)岩体由黑云母碱长石花岗岩(BAFG)和碱花岗岩(AG)以及混合花岗岩带(HGZ)组成。BAFG相主要由碱组成,其组成范围从花岗岩到碱性长石花岗岩,属于造山后花岗岩(POG)和板内花岗岩(WPG)。AG代表了研究岩体中岩浆作用最年轻的碱性花岗岩相。HGZ内记录了由闪长岩和微花岗岩组成的各种飞地。通过岩浆织物测量结果的定量分析证实的田间关系表明,AG花岗岩相以亚平行伸长的片状或堤状块状趋向EW的形式存在,并与右侧走滑带覆盖的伸展带相关。“板内”超溶质花岗岩的这一阶段含有过多的大离子亲石剂(LIL)和属于A型花岗岩的高场强(HFS)元素,例如Zr,Nb和Ga,

更新日期:2021-01-10
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