Publications | Persons | Institutes | Projects
[ report an error in this record ]basket (1): add | show Print this page
one publication added to basket [323183]
New insights into mineralogy and geochemistry of allanite-bearing Mediterranean coastal sands from Northern Greece
Tzifas, I.T.; Papadopoulos, A.; Misaelides, P.; Godelitsas, A.; Göttlicher, J.; Tsikos, H.; Gamaletsos, P.N.; Luvizotto, G.; Karydas, A.G.; Petrelli, M.; Noli, F.; Kantarelou, V.; Kontofakas, A.; Hatzidimitriou, A. (2019). New insights into mineralogy and geochemistry of allanite-bearing Mediterranean coastal sands from Northern Greece. Chemie der Erde-Geochemistry 79(2): 247-267. https://dx.doi.org/10.1016/j.chemer.2019.05.002
In: Chemie der Erde-Geochemistry: Jena. ISSN 0009-2819; e-ISSN 1611-5864, more
Peer reviewed article  
Available in  Authors 
Keyword
    Marine/Coastal
Author keywords
    Kavala; Beach placer; REE; Thorium; Allanite; mu-XRF; SR-XANES
Authors  Top 
  • Tzifas, I.T.
  • Papadopoulos, A., more
  • Misaelides, P.
  • Godelitsas, A.
  • Göttlicher, J.
  • Tsikos, H.
  • Gamaletsos, P.N., more
  • Luvizotto, G.
  • Karydas, A.G.
  • Petrelli, M.
  • Noli, F.
  • Kantarelou, V.
  • Kontofakas, A.
  • Hatzidimitriou, A.
Abstract
    Allanite-bearing black coastal sands of Kavala (N. Greece) were studied using a combination of single-crystal XRD, EMPA, μ-XRF, bulk ICP-MS, LA-ICP-MS, μ-XANES and γ-ray spectrometry. The sands are rich in REE (ΣREE + Y: 4010 to 10,810 mg/kg), Th (236–1205 mg/kg) and other critical metals such as Nb, Ta and Co. The main REE- and Th-hosts are allanite and titanite. The allanite unit cell parameters were calculated whereas its formula was found to be (REE0.470Ca1.499Th0.031) (Ti0.031Fe+31.089Al1.880) (Si2.906Al0.094O12) (OH). The μ-XANES spectra showed that LREE are present in trivalent oxidation state. Analyses of the non-magnetic sand fractions showed higher LREE (12,470 mg/kg) due to accumulation of allanite. The materials showed elevated radioactivity ranging from 885 ± 13 to 3467 ± 20 Bq/kg. The obtained results provide new insights on the provenance of the sands, the abundance of REE, Th, and other immobile elements, and offer new clues for potential exploration and exploitation.
All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors