Aerial and ground radiometry in relation to the sedimentation of radioactive minerals of the Damietta beach sands, Egypt

Beach sands from Aggelochori coast line are investigated for their geochemistry and REE content, mineralogy and their provenance. These fluvial sands bear heavy minerals enriched horizons (containing minerals such as magnetite, zircon, ilmenite, hematite, rutile and titanite) that can be distinguished due to their black color and are formed usually due to the action of sea waves that deposit the heavy minerals and remove the lighter ones. After a suitable processing (washing, sieving, drying and magnetic separation) of the samples, the mineral constituents and their presence (wt.%) were estimated by XRD. Among the samples, the one being simultaneously the more fine grained and the more zircon-enriched (as suggested by XRPD data and optical microscopy analysis) has been selected for further geochemical analyses. The major and trace elements contents were compared to previously studied REE enriched beach sands from Kavala and Sithonia. Beach sands from Aggelochori area appear to have relatively low REE contents. Considering the provenance of these sediments, we suggest that these sands, are a product of the erosion of multi-sources, including the near-by Monopigado granite, as well as metamorphic rocks, as indicated by the presence of rutile and both ilmenite and magnetite in some samples. Therefore, there are indications of a complex flow pattern that existed at the paleo-catchment area of the deposition.

Download Full-text

Correlation of VLF-EM Data with Radiometric Measurements: Implications for Uranium Exploration around Beldih, South Purulia Shear Zone, India

International Journal of Geophysics ◽

10.1155/2014/969462 ◽

2014 ◽

Vol 2014 ◽

pp. 1-13 ◽

Cited By ~ 4

Author(s):

Saurabh Mittal ◽

S. P. Sharma ◽

Arkoprovo Biswas ◽

D. Sengupta

Keyword(s):

Shear Zone ◽

High Surface ◽

Uranium Mineralization ◽

Subsurface Structure ◽

High Radiation ◽

Background Radiations ◽

Radiometric Measurements ◽

Uranium Exploration ◽

Radioactive Minerals ◽

Open Cast

This study is an attempt to correlate VLF-EM data with the radiometric measurements to decipher the subsurface structure and to locate uranium mineralization in the shear zone. The study area is around Beldih mine which is an open cast apatite mine located on the South Purulia Shear Zone. VLF method has been applied to map the structure and the presence of radioactive minerals has been delineated by the detection of highαandγcounts with respect to the background radiations. High radiation counts and high surfaceγactivity are found just above the higher apparent current-density zones in all the profiles studied, at various locations, indicating uranium and/or thorium mineralization as well as good correlation between these techniques.

Download Full-text

Postglacial Diatom Stratigraphy in Relation to the Recession of Glacial Lake Agassiz

Quaternary Research ◽

10.1016/0033-5894(75)90014-9 ◽

1975 ◽

Vol 5 (4) ◽

pp. 529-540 ◽

Cited By ~ 10

Author(s):

J.C. Ritchie ◽

L.K. Koivo

Keyword(s):

Sandy Beach ◽

Sedimentary Environment ◽

Glacial Lake ◽

Lake Agassiz ◽

Organic Detritus ◽

Sedimentary Environments ◽

Grand Rapids ◽

Glacial Lake Agassiz ◽

Diatom Stratigraphy ◽

Beach Sands

The sediment and diatom stratigraphy of a small pond on The Pas moraine, near Grand Rapids, Manitoba, reveals a change in sedimentary environment related directly to the last stages of Glacial Lake Agassiz. Beach sands were replaced by clay 7300 14C y. a., then by organic silt and, at 4000 14C y. a. by coarse organic detritus; the corresponding diatom assemblages were (I) a predominantly planktonic spectrum in beach sands, (II) a rich assemblage of nonplanktonic forms, and (III) a distinctly nonplanktonic acidophilous spectrum. These results confirm Elson's (1967) reconstruction of the extent and chronology of the final (Pipun) stage of Glacial Lake Agassiz. The sedimentary environments change from a sandy beach of a large lake at 7300 BP to a small, shallow eutrophic pond with clay and silt deposition from 7000 to 4000 BP. From 4000 BP to the present, organic detritus was deposited in a shallow pond that tended toward dystrophy.

Download Full-text

Geochemical maturity of pocket beach sands from the San’in region of southwest Japan

Earth Science Research ◽

10.5539/esr.v4n2p74 ◽

2015 ◽

Vol 4 (2) ◽

Author(s):

Bah Mamadou Lamine Malick ◽

Hiroaki Ishiga

Keyword(s):

Southwest Japan ◽

Beach Sands

Download Full-text

Texture and composition of the Rosa Marina beach sands (Adriatic coast, southern Italy): a sedimentological/ecological approach

Geologos ◽

10.1515/logos-2016-0011 ◽

2016 ◽

Vol 22 (2) ◽

pp. 87-103 ◽

Cited By ~ 4

Author(s):

Massimo Moretti ◽

Marcello Tropeano ◽

A.J. (Tom) van Loon ◽

Pasquale Acquafredda ◽

Rossella Baldacconi ◽

...

Keyword(s):

Southern Italy ◽

Statistical Parameters ◽

Source Areas ◽

Potential Source ◽

Physical Study ◽

Family Level ◽

Adriatic Coast ◽

Beach Sands ◽

Shell Fragments

Abstract Beach sands from the Rosa Marina locality (Adriatic coast, southern Italy) were analysed mainly microscopically in order to trace the source areas of their lithoclastic and bioclastic components. The main cropping out sedimentary units were also studied with the objective to identify the potential source areas of lithoclasts. This allowed to establish how the various rock units contribute to the formation of beach sands. The analysis of the bioclastic components allows to estimate the actual role of organisms regarding the supply of this material to the beach. Identification of taxa that are present in the beach sands as shell fragments or other remains was carried out at the genus or family level. Ecological investigation of the same beach and the recognition of sub-environments (mainly distinguished on the basis of the nature of the substrate and of the water depth) was the key topic that allowed to establish the actual source areas of bioclasts in the Rosa Marina beach sands. The sedimentological analysis (including a physical study of the beach and the calculation of some statistical parameters concerning the grain-size curves) shows that the Rosa Marina beach is nowadays subject to erosion.

Download Full-text