Mineralogy and geochemistry of fine-grained Dahab stream sediments, Southeastern Sinai, Egypt: emphasis on the intergrowths of Fe–Ti oxides

作     者：Adel A.Surour Ahmed.M.A.El-Kammar Ebtisam H.Arafa Hala M.Korany Adel A.Surour;Ahmed.M.A.El-Kammar;Ebtisam H.Arafa;Hala M.Korany

作者机构：Petroleum and Mining GeologyFaculty of SciencesGalala University43511 New Galala CityEgypt Department of GeologyFaculty of ScienceCairo UniversityGiza 12613Egypt 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2021年第40卷第6期

页      面：871-894页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 081803[工学-地质工程] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：Egyptian Mineral Resources Authority 

主　　题：Dahab stream sediments Silt fraction Fe-Ti oxides Textural variations Rees enrichment 

摘      要：Mineralogical and geochemical characteristics of stream sediments collected from 30 stations in the Dahab-Wadi Kid area(southeastern Sinai,Egypt)are *** studied sediments contain considerable amounts of heavy minerals,including abundant Fe–Ti oxides,with up to 25.94%index figure that measures the relative abundance of heavy minerals to light *** of the sediments and nature of Fe–Ti oxide intergrowths,in addition to some non-opaque heavy minerals,indicate multiple provenances with contributions from a variety of Neoproterozoic mafic to felsic *** amounts of heavy minerals are derived from schists that belong to the so-called Wadi Kid volcanosedimentary *** to the considerable contribution of the felsic intrusions represented by within-plate granites,the sediments are enriched in REE-bearing minerals(e.g.,monazite,cerianite,La-cerianite and allanite),V-bearing thorite,zircon,and a ZrO_(2) *** majority of Fe–Ti oxides are derived from the mafic intrusions,and they show evidence of pre-,syn-and post-depositional phases of alteration and formation of *** to the geochemical signature of the bulk silt fraction,there is remarkable enrichment of LREEs with distinct negative Eu anomaly,and this supports dominance of a provenance dominated by felsic intrusions(i.e.,the A-type within-plate granite and associated pegmatites).Also,the felsic provenance is responsible for slight abnormality of ∑PU+Th content(up to~37 ppm)and few anomalous samples bear uraniferous zircon and Ce-type *** present paper sheds light on the fertility of the Dahab stream sediments in some economic minerals for possible future exploitation,not for gold only,but for potential REEbearing minerals that are needed for a wide spectrum of modern technological industries.