Egyptian Journal of Geology最新文献

{"title":"DEPOSITIONAL ENVIRONMENTS, TEXTURAL AND MINERALOGICAL CHARACTERISTICS OF THE EXPOSED QUATERNARY SEDIMENTS, GIZA, EGYPT","authors":"El Sayed, Khattab, A.","doi":"10.21608/egjg.2020.216314","DOIUrl":"https://doi.org/10.21608/egjg.2020.216314","url":null,"abstract":"Quaternary sediments are extensively exposed in Kafr El Gebel area, south of Sphinx, Giza, Egypt. Ten stratigraphic sections have been chosen for studying and sampling. Fifty one samples were collected to investigate sedimentological and mineralogical characteristics of the Quaternary sediments. The statistical grain size parameters revealed that the investigated sands are mainly medium to coarse, very well sorted to poorly sorted, mostly near symmetrical skeweed accompanied by mesokurtic to leptokurtic characters. The textural characteristics strongly suggest that fluvial conditions of braided river were most probably the dominating factors controlling the transportation and accumulation of the investigated sediments. The light minerals of the investigated sand are composed mainly of quartz with minor amount of feldspars. The non-opaque heavy mineral assemblages of the Quaternary sediments are characterized by the predominance of pyroxene, amphiboles, epidote, zircon, tourmaline, rutile, garnet, staurolite and kyanite. Andalusite, titanite and monazite are recorded in a few samples. The low values of ZTR index suggesting mineralogically immature nature of these sediments. The heavy minerals assemblage of these sediments assemblage indicates a variety of probable source rock types including metamorphic, igneous, and sedimentary.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126937524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GEOLOGY AND DISTRIBUTION OF RADIOELEMENTS AS WELL AS ENVIRONMENTAL IMPACT AT ABU MARW YOUNGER GRANITES, SOUTH EASTERN DESERT, EGYPT","authors":"El Afandy","doi":"10.21608/egjg.2020.215762","DOIUrl":"https://doi.org/10.21608/egjg.2020.215762","url":null,"abstract":"This work discusses the geologic setting of Abu Marwarea, and the distribution of the natural radionuclides and assess the radiological hazard resulting from the granites in the area. The environmental background levels of natural radiation, human exposure and dose rates as well as possible environmental impacts of radiation were investigated. The field investigation of the different rock units, with references to their mode of occurrence, mutual relationships, petrography and regional structure resulted that the area is covered by Late Proterozoic igneous and metamorphic rocks. These rocks are nonconformably overlain by Cretaceous Nubian sandstone in the western and northern parts of the area and they arranged from the oldest to the youngest rocks by Metagabbros, Metavolcanics, Older granites (tonalities and granodiorites) and Younger granites (monzogranites, syenogranites and Alkali-feldspar granites). The younger granitic rocks at Abu Marw area have low uranium and thorium contents, where the average contents of uranium are 1.14ppm, 5.7ppm and 2.1ppm and thorium are15.2ppm, 22.5ppm and 13.8ppm for monzogranites, syenogranites and alkali feldspar granites. The excess values of uranium and thorium contents in syenogranites are due to the high contents of uranium and thorium bearing minerals in these rocks. The environmental impacts of the monzogranires, syenogranites and alkali feldspar granites at Abu Marw area are studied. The radium equivalent activity (Raeq), gamma activity index (I), alpha activity index (Iα), external hazard index (Hex), internal hazard index (Hin), external absorbed dose rate in outdoor (Dout) and indoor (Din), annual effective dose (AEDE), annual gondal dose equivalent (AGDE) and excess lifetime cancar risk (ELCR) are calculated. The studies concluded that all the environmental impacts dose rates values in the younger granitic rocks (monzogranites, syenogranites and alkali feldspar granites) rocks are lower than the publicpermissible values in these rocks and they are within the safety range for the public and workers. So, these rocks are safety for the building and ornamental materials.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"246 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122460815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TAPHONOMIC CONDITIONS AND ASSESSMENT OF THE LATE CRETACEOUS VERTEBRATES BEARING SITES IN THE WESTERN DESERT, EGYPT","authors":"G. El-kheir","doi":"10.21608/egjg.2020.216326","DOIUrl":"https://doi.org/10.21608/egjg.2020.216326","url":null,"abstract":"The detailed stratigraphical field relations and taphonomic conditions and assessment of the Upper Cretaceous vertebrate bearing horizons in Western Desert of Egypt were investigated in the three sites; Campanian Quseir Formation, Kharga Oases, Maastrichtian Ammonite Hill member of Dakhla Shale, Abu Minqar and Lower Cenomanian Bahariya Formation in Gebel El Dist, Bahariya Oases. It was found that the most important taphonomic factors controlling the preservation state of vertebrate fossils in the selected sites are rate of transportation and sedimentation as well as bio-erosion and diagenetic events of the bearing sediments. A comparative study of these factors was achieved between the investigated vertebrates bearing sites. The study indicated that the vertebrate fossils in Bahariya and Kharga Oases are more preserved and less abraded than these in Abu Minqararea. Generally, the study vertebrate fossils that yielded in sandstones have better preserved state than other lithological types. Furthermore, the deposition in low rate of transportation and high rate of sedimentation give the vertebrate carcasses good opportunity for the rapid burying with articulated and semi articulated elements, consequently better preservation state. Due to the importance of the vertebrate bearing low topographic sites in the Western Desert, its highly recommended to carry out serious and decisive mitigation for the protection against negative impacts that caused by human activities (e.g. illegal land reclamation and ecotourism) which leading to groundwater rise in these lowlands.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133891876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"UTILIZATION OF SOME EGYPTIAN RAW MATERIALS IN ROCK WOOL INDUSTRY: THERMAL AND ACOUSTIC INSULATION","authors":"Farouk, E. Kammar","doi":"10.21608/egjg.2020.215754","DOIUrl":"https://doi.org/10.21608/egjg.2020.215754","url":null,"abstract":"In the time of increasing the cost of energy, we try to use different grades or inexpensive basalt in rock wool production to reduce the cost and produce well-matched rock wool quality commodities. This work assesses the suitability of basalt from three localities in Egypt (Abu-Zaabal, El-Fayoum and Baharyia) to produce rock wool that intended for thermal and acoustic insulation of buildings, and industrial equipment. Dolostone from Gabal Ataqa was incorporated in the batch to facilitate melting of basalt. All raw samples and the produced rock wool were chemically characterized using XRF. In addition, the different properties of the obtained rock wool such as thermal, mechanical, acoustic and reaction to fire have been evaluated. The obtained results reveal that all rock wool characteristics are bracketed in the acceptable range for the thermal, mechanical, acoustic and reaction to fire properties. The thermal conductivity (K) of all wool slabs are bracketed in the acceptable ranges of standard specifications.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115584531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"LATE MAASTRICHTIAN CALCAREOUS NANNOFOSSIL CLIMATE RECORD AT QUSEIR REGION, RED SEA COAST, EGYPT: IS THAT LINKED TO DECCAN VOLCANISM?","authors":"Amr A. Metwally","doi":"10.21608/egjg.2020.216322","DOIUrl":"https://doi.org/10.21608/egjg.2020.216322","url":null,"abstract":"Calcareous nannofossil record of the Late Maastrichtian is analyzed at three sections at the Eastern Desert, Quseir region, Red Sea coast, Egypt. These sections are Gabal Anz, Gabal Atshan and Gabal Hamadat. Species richness as well as the relative abundance of sensitive nannofossil indicators throughout this interval signified remarkable climatic changes. It is indicated that the Late Maastrichtian is marked by cool climate that intersected by two warming episodes. The lower episode is marked by a drop in species richness as well as cool-water indicators concomitant with a positive shift of the warm-water species Micula decussata and M. murus. This event is interpreted as a response to sea-level fluctuations associated with an extreme oligotrophic condition of local environmental signal. The second episode corresponds to the latest Maastrichtian warming event. It is nearly has the same characteristics of the lower episode but it differs in the assemblage diversity. The nannofossil results during this event are correlated globally with similar observed findings. The main outcome of this correlation is the bloom of M. murus at the terminalMaastrichtian is contemporaneous with the observed acme at other localities. The possible drivers for such warming at the studied area throughout the latest Maastrichtian could be attributed to the double effect of the main phase of Deccan volcanism (Phase-2) that associated with sea-level fluctuations due to local tectonic activity. The climatic evolution of the interval preceding directly the Cretaceous/Paleogene (K/Pg) boundary cannot be traced due to the presence of hiatus.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123905341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GEOTOURISTIC POTENTIALITY OF HAMMAM FARAUN GEOTHERMAL AREA, SOUTH SINAI GOVERNORATE, EGYPT","authors":"Shawky, El-Anbaawy, Shallaly, Abdelhafiz","doi":"10.21608/egjg.2020.215757","DOIUrl":"https://doi.org/10.21608/egjg.2020.215757","url":null,"abstract":"Hammam Faraun area is considered as one of the main geothermal areas in Egypt, as such its geotouristic attractions are inventoried and assessed in the present study. These attractions are represented essentially in Gebel Hammam Faraun, the coastal area facing it, thermal springs, karstic caves, travertine, and volcanic occurrences. Gebel Hammam Faraun represents an outstanding geomorphosite in West Sinai and together with the Gulf of Suez it forms an interesting mountainous-shore landscape. Thermal springs which represent the hottest ones in Egypt recognize this area and have important benefits in balneotherapy and are under investigation for the use in power production. Together with the thermal springs, the karstic caves that are used as natural saunas in the area represent the main geotouristic attractions. Travertine is an important yet not known geologic feature in Hammam Faraun area however, being found in small patches lowers its geotouristic potentiality. Diverse volcanic bodies in the form of sills, dykes and flows are remarkable features that add to the geotouristic potentiality of the study area. It is demonstrated that this area is remarkable for its diverse landscape, active geothermal phenomenon, and outstanding geological, and geomorphological features. Thus, the area has a geotouristic and geoheritage potentiality that can attract both geologists and public. The geotouristic potentiality of Hammam Faraun can be attributed to both scenic and educational values of its geologic features. Moreover, the study gives some recommendations for geotourism development at the area. Furthermore, a coupling between geothermal energy use and geotourism development in the area could support environmental conservation and sustainable development goals in Sinai Peninsula.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127903422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PALYNOSTRATIGRAPHICAL STUDY OF SOME CRETACEOUS ROCKS (APTIAN– LOWER CENOMANIAN) OF NABIL-1 WELL, NORTH WESTERN DESERT, EGYPT","authors":"F. MostafaT., T. F. Mostafa","doi":"10.21608/egjg.2020.216321","DOIUrl":"https://doi.org/10.21608/egjg.2020.216321","url":null,"abstract":"A palynological analysis has been carried out on the Lower–Middle Cretaceous (Aptian-lower Cenomanian) rock units encountered in the subsurface section of the Nabil-1 well, north Western Desert of Egypt. Twenty four ditch cutting samples have been analyzed palynologically and produced 40 species, which allow recognizing six informal palynomorphs zones restricted to northern Western Desert ranging from early Aptian to Cenomanian age. The identified zones are CE.1 Elaterosporites klaszii Acme zone, CE.2 Trilobosporites laevigatus interval zone, AL.1 Araucariacites australis Acme zone, AL.2 Concavissimisporites punctatus interval zone, AL.3 Concavissimisporites sp. sensu Deaf 2009 interval zone, AP.1 Murospora florida Acme zone and AP.2 Afropollis operculatus Acme zone. The erected palynozones are not only applicable to the western part of the Western Desert, but valid to the north Western Desert as well. They are correlated with well-documented zonations established for the same interval from other sites in the north Western Desert of Egypt and outside in North Africa. The palaeoenvironmental settings ranged between arid to semi arid in the lower Cenomanian to humid in the Albian and Aptian with marine conditions that varied between near shore to open marine environment.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"375 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114002333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PALEOECOLOGICAL SIGNIFICANCE OF PALYNOMORPHS FROM PALEONTOLOGICALY-DATED MAASTRICHTIAN–DANIAN DEPOSITS, BIR ABU MINQAR AREA, SOUTH WESTERN DESERT, EGYPT","authors":"Maher I. El-Soughier","doi":"10.21608/egjg.2020.216323","DOIUrl":"https://doi.org/10.21608/egjg.2020.216323","url":null,"abstract":"This study is carried out on the Dakhla Formation deposits at the Bir Abu Minqar section, South Western Desert, Egypt. Maastrichtian/Danian palynofloras have been recovered from the micropaleontology (foraminifera–nannoplankton)and macropaleontology (bivalvia-ammonites)dated deposits of the upper Dakhla Formation. Pteridophytic and liverworts spores, pollen of gymanosperms and angiosperms as well as dinoflagellate cysts have been identified. Angiosperm pollen includes typical members of the Late Cretaceous Palmae Province such as Spinizonocolpites echinatus. Presence of palm pollen and hygrophylic pteridophytic spores suggest a prevalence of humid tropical conditions during the deposition of the studied section, with Nypa palm mangroves thriving in the intertidal swamps that bordered the Late Cretaceous shallow sea at the area of the Abu Minqar.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130026704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"BIOSTRATIGRAPHY OF THE MIOCENE SUCCESSIONS IN THE SADAT AREA, WEST GULF OF SUEZ-EGYPT","authors":"Hewaidy","doi":"10.21608/egjg.2020.216325","DOIUrl":"https://doi.org/10.21608/egjg.2020.216325","url":null,"abstract":"The age of the exposed Sadat, Hommath and Hagul formations in Sadat area on the west side of the Gulf of Suez, is inadequately resolved due to the scarcity of diagnostic planktic foraminifera and calcareous nannofossil taxa. The detailed analysis of the calcareous nannofossil content, planktic and larger benthic foraminifera of three sections measured in Wadi El-Ramiya, Wadi Hommath and Wadi Hagul at Sadat area, allows identification of 23 calcareous nannofossil species, 23 planktic foraminiferal species and 152 benthic foraminiferal species. Our results indicate that the Sadat Formation is assigned to Burdigalian-Langhian age according to the occurrence of Miogypsina cushmani and Miogypsina intermedia in its lower part and the appearance of Borelis melo in its upper part. The Hommath Formation is assigned to the Langhian-Serravallian age depending on the occurrence of Borelis melo curdica together with Borelis melo melo. The Hagul Formation is barren from any zonal marker but it is assigned to the late Miocene age according to its stratigraphic position.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133608722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SEQUENCE STRATIGRAPHY OF THE EOCENE ROCKS IN QATAR PENINSULA, ARABIAN GULF","authors":"Al-Saad","doi":"10.21608/egjg.2020.216319","DOIUrl":"https://doi.org/10.21608/egjg.2020.216319","url":null,"abstract":"The Eocene sedimentary succession of Qatar is subdivided, from older to younger, into the Umm er Radhuma, Rus and Dammam formations. This Eocene succession forms a part of the Arabian Plate Megasequence (AP10) and has been partitioned into two sequences; Pg 10 and Pg 20 respectively. The lithofacies and biofacies studies of this Eocene megasequence in Qatar have enabled the identification and interpretation of the depositional settings and faunal elements of the different Eocene units. The lower Pg 10 sequence is represented by the shallow water Umm Er Radhuma and Rus formations, and is subdivided into a lower transgressive and an upper highstand systems tracts, while the upper Pg 20 sequence is represented by the shallow water Dammam Formation, and is subdivided into a transgressive and a highstand systems tracts. These two sequences are bounded by three major sequence boundaries.","PeriodicalId":282322,"journal":{"name":"Egyptian Journal of Geology","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117239941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}