Autor: Defaflia, Nabil - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Investigation of litho-biostratigraphic characteristics and geographical distribution of Coniacian-Santonian formations: a case study in the Aures Mountains, eastern Saharan Atlas, Algeria
Autorzy:: Bentahar, Fahima
Defaflia, Nabil
Benmansour, Sana
Fehdi, Chemseddine
Tematy:: biostratigraphy
foraminifera
biozonation
coniacian
santonian
Aures
Algeria
biostratygrafia
otwornice
biozonacja
koniak
snaton
Algieria; Pokaż więcej
Wydawca:: Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/24201207.pdf Link otwiera się w nowym oknie
Opis:: The Coniacian-Santonian series in the Aures Mountains of northeastern Algeria is characterized by marly-dominated sedimentation processes. This study aims to comprehensively investigate this series by combining lithostratigraphic and biostratigraphic data. The unique paleogeographic position of the Aures basin supports the co-occurrence of diverse paleontological contents in the Upper Cretaceous sediments. The methodology employed in this study includes a detailed bio-lithostratigraphic analysis to subdivide the Coniacian-Santonian series into two distinct sets. The first set comprises alternating marl-limestone units that exhibit a high fossil concentration from the Coniacian age, while the second set mainly consists of marly sediments corresponding to the Santonian age. The results obtained from this study highlight the geographical distribution of litho-biostratigraphic characteristics and reveal the presence of two formations. The lower formation is characterized by carbonated marls intercalated with limestone banks, containing fossils of Peroniceras (Tissotia tissoto) from the Coniacian age. Meanwhile, the upper formation is predominantly marly and indicates the Santonian age by displaying fossils of Palcenticeras polypsis. Furthermore, a biostratigraphic analysis focused on foraminifers allows for the subdivision of the Coniacian-Santonian series in the Aures Mountains into three distinct biozones. The first biozone corresponds to the lower Coniacian age and is identified by the presence of Dicarinella primitiva. The second biozone represents the middle to upper coniacian age and contains Dicarinella concavata fossils. Finally, the third biozone, belonging to the Santonian age, is marked by the occurrence of Dicarinella asymetrica. The boundary between the Coniacian and Santonian series in the Aures Mountains is characterized by the first appearance of Dicarinella asymetrica and Palcenticeras polypsis species. This multidisciplinary study provides valuable insights into the litho-biostratigraphic characteristics and geographical distribution of the Coniacian-Santonian series in the Aures Mountains. The findings make a significant contribution to a better understanding of sedimentary processes and the paleontological content within this region during the Upper Cretaceous period.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Exploring the economic significance and diverse hues of quartz: A case study at Adaila, south of El Ma Labiod, NE Algeria
Autorzy:: Nacer, Wassila
Defaflia, Nabil
Taib, Hassan
Rehebi, Rofaida
Tematy:: ferric elements
granulometric parameters
quaternary
Oued Adaila
quartz colouring
parametry granulometryczne
czwartorzęd
barwienie kwarcu; Pokaż więcej
Wydawca:: Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/59123486.pdf Link otwiera się w nowym oknie
Opis:: The Tebessa region in Algeria is rich in mineralogical resources within its Quaternary deposits, particularly in quartz. This study adopts a multidisciplinary approach including stratigraphic, sedimentological, and granulometric analyses, focusing specifically on the deposits located in the fluvial terraces of the Oued Adaila, south of Tébessa in eastern Algeria. The analysis of granulometric parameters gave valuable insights into the uniformity of the energy levels exerted by the transport agents. Pioneering exoscopy techniques have proved indispensable in discerning the sedimentary history of quartz, offering comprehensive insights into its weathering processes and its intricate journey through continental aquatic pathways. Additionally, this methodology has elucidated the genesis of unique colourations observed in quartz grains. Using Scanning Electron Microscopy (SEM), we have examined the surfaces of quartz grains, revealing an array of patterns attributable either to the inherent crystal lattice structure of quartz or to the erosive influences of the changing environment. These environmental modifications stand out as the primary contributors to the diverse spectrum of colours manifested in the quartz grains. Furthermore, the examination of magnetic data has highlighted the pivotal role played by various oxides present in the Quaternary deposits. These oxides proved to be important sources of ferric elements, crucial in imparting the distinct colorations observed in quartz. This comprehensive study significantly advances our understanding of the mineralogical constitution, sedimentary evolution, and the environmental dynamics shaping the Quaternary deposits in the Tebessa region.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Blast design and improvement of the quality of fragmentation in the aggregate quarries. Case study: Djebel Bouzegza C01
Autorzy:: Bedri, Khaoula
Assed, Mohamed Aguid Bachar
Taib, Hassan
Hadji, Riheb
Defaflia, Nabil
Filali, Mira
Tematy:: design blast
powder factor
Kuz Ram model
wybuch
proszek
model Kuz-Ram; Pokaż więcej
Wydawca:: Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/59123436.pdf Link otwiera się w nowym oknie
Opis:: Fragmentation efficiency is important concerned in mining and quarrying as it effects on the productivity of different mining operations. Various parameters effect on the quality of the fragmentation. However, this research was aimed to study the effect of powder factor, burden and spacing on the blasting fragmentation in the Djebel Bouzegza C01 quarry, Boumerdes, Algeria. For the evaluation of the average size fragment, it had been used the processing image Split Desktop (P50) and compared with the results of the predictive model Kuz Ram (X50). The highest values of X50 (680.00 mm) and P50 (645.45 mm) were recorded when the largest values of (burden × spacing) that were (4.5 m × 4.5 m) and in the smallest value of the powder factor which was 0.20 kg · m–3. The Fragmentation Indicator FI gives the affectedness of the Kuz Ram Model. After plotting the results on 3D surface, it has improved the results of the average size when the burden will be less than 3.70 m and the powder factor will be less than 0.64 kg · m–3 while to minimized the percentile of oversize fragments, it was obtained that the burden will be less than 3.70 mm, otherwise the powder factor was more than 0.30 kg · m–3. Blast design parameters and the powder factor are therefore important variables in improving the results of blast fragmentation.
Dostawca treści:: Biblioteka Nauki

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