Geochemistry of coastal sands of Eastern Mediterranean: The case of Nisyros volcanic materials

Tzifas, Ioannis; Μisaelides, P.; Γοδελίτσας, Α.; Gamaletsos, P.; Nomikou, Paraskevi; Karydas, A. G.; Kantarelou, V.; Papadopoulos, Argyrios

doi:10.1016/j.chemer.2017.07.002

Cited by 11 publications

(17 citation statements)

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“…As also described in the reviewed literature [27][28][29][30][31][32][33][34][35][61][62][63][64][65] samples of heavy mineral sands were collected both from surface exposures and from the immediately reachable subsurface thereof. Sampling was carried out against a chosen grid, the dimensions of which varied from one locality to the next, depending on the dimensions of each beach.…”

Section: Methodsmentioning

confidence: 99%

“…Bulk chemical analysis and LOI measurements were carried out at the ACME and ACT Labs (Canada) whereas heavy mineral separation (where applicable) was conducted at the Department of Geology, University of Thessaloniki. Further details on the analytical methodology used can be found in all previous For more in-depth geological information on each occurrence reviewed the reader is referred to the Supplementary Materials detailed maps and additional geological details, and to earlier publications specific to each locality revisited [27][28][29][30][31][32][33][34][35][61][62][63][64][65]. Through reviewing this substantial body of older and recent research, our ultimate goal with the present treatise is to provide a useful and timely first-order reference for academics and industry professionals alike, with a vested interest in the metallogenic potential of Greece with respect to REE.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Beach placers from Nisyros island have also been investigated as an end-member case study of heavy mineral sands in a predominantly volcanic provenance. The remaining placer deposits mentioned above from northern Greece and the Atticocycladic belt, represent coastal sands derived mainly from the weathering of plutonic rocks [65].…”

Section: Placers Of Greecementioning

confidence: 99%

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The Potential for REE and Associated Critical Metals in Coastal Sand (Placer) Deposits of Greece: A Review

2019

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The rare earth elements (REEs) are characterized by the European Union (EU) as critical raw materials with a significant risk of supply because of their broad utility in both traditional and emerging technological applications. The growing demand for REE has caused a flurry in the search for new REE deposits in Europe and elsewhere in the world, and is also linked to rising exploitation efforts in a variety of geological settings. To this end, Greece appears to be a promising candidate to become a leading EU country in terms of REE by virtue of its natural endowment in sedimentary heavy mineral deposits (placers) along its long coastline. The present review focuses on the distribution, abundance, and bulk geochemistry of REEs and other critical metals (Ta, Nb, Co) associated with placer deposits of Greece, and specifically with geologically young heavy mineral sand accumulations developed proximal to felsic plutonic source rocks. These deposits are also enriched in the actinides uranium (U) and thorium (Th), as both of these metals are typically associated with REE-rich minerals such as xenotime, monazite, thorite, allanite, and zircon. Previous studies have employed a variety of analytical techniques down to nano-meter scale with the aim to elucidate the mineralogy and distribution of REE and associated actinides in Greek beach placers. In view of this mineralogically-intensive background, the present review focuses chiefly on bulk geochemical characteristics of the same deposits and the variations thereof between two major geographical regions (northern Greece, southern Aegean) and across individual placer occurrences within them. In this framework, we present comprehensive compositional comparisons between the different deposits, highlighting the geological sub-environments wherein they occur, their distinctive sources and geochemical signatures, and their potential economic significance in terms of REE and other critical metal enrichments where applicable.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Placers Of Greecementioning

confidence: 99%

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The Potential for REE and Associated Critical Metals in Coastal Sand (Placer) Deposits of Greece: A Review

2019

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“…Also, silicic igneous rocks contain negative Eu anomalies (Eu/Eu * = < 1) and basic igneous rocks contain little or no Eu anomalies (Eu/Eu * = 1), and the size of the anomalies in the provenance appear to be preserved in the clastic sediments (Cullers, ). Hence, the chondrite‐normalized REE patterns and the size of the Eu anomalies (positive or negative) are considered as a reliable tool for determining depositional processes and sediment provenance (Armstrong‐Altrin et al, ; Tawfik, Ghandour, Maejima, Armstrong‐Altrin, & Abdel‐Hameed, ; Tzifas et al, ; Xie, Yuan, Zhan, Kang, & Chi, ). The chondrite‐normalized REE patterns of the Atasta sands are with distinct negative Eu anomaly and comparable with UCC, but the REE abundances are depleted relative to UCC.…”

Section: Discussionmentioning

confidence: 99%

Provenance discrimination between Atasta and Alvarado beach sands, western Gulf of Mexico, Mexico: Constraints from detrital zircon chemistry and U–Pb geochronology

et al. 2018

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The bulk sand samples and detrital zircons collected from the Atasta and Alvarado beach areas in the southwestern Gulf of Mexico have been analysed for geochemistry and U–Pb ages to constrain their provenance. The index of chemical maturity and SiO2/Al2O3 ratio of the Atasta and Alvarado beach sands indicated low compositional maturity. The chondrite‐normalized REE patterns and Eu anomalies of the Atasta and Alvarado beach sands suggested that the sands were derived from felsic and intermediate igneous rock types, respectively. A wide range in Th and U contents of the Atasta (~1.0–884 ppm and ~39–883 ppm, respectively) and Alvarado (~13–2,641 ppm and ~21–2,457 ppm, respectively) zircons likely indicates that the detrital zircon populations consist of zircons derived from multiple sources. The total rare earth element (ΣREE) content in the Atasta and Alvarado zircons ranges from ~151 to 2,088 ppm and ~154 to 3,580 ppm, respectively. The chondrite‐normalized REE patterns of zircons from the two beach areas show slightly depleted light REE (LREE) and enriched heavy REE (HREE), as well as positive Ce and negative Eu anomalies. A few zircons of Alvarado beach lack a Ce positive anomaly but exhibit a distinct Eu anomaly. The differences in REE patterns among zircons between the two beach areas revealed the variations in the type of source terranes, which supplied zircons to the beach areas. The detrital zircon age distribution for the Atasta beach is homogeneous, showing a prominent Proterozoic peak (~596–2,461 Ma; number of samples n = 62) with few Cenozoic (~10.43–65.2 Ma; n = 4) and Palaeozoic (~380–468 Ma; n = 5) zircons. The zircon U–Pb ages of Alvarado beach revealed Cenozoic (~0.25–63.9 Ma; n = 65), Mesozoic (~67.9–181.2 Ma), Palaeozoic (~252–297 Ma), and Proterozoic (~589–1,501 Ma) age clusters with predominant Cenozoic zircons. The comparison of zircon REE chemistry and geochronological data of this study with published data suggests that the source terranes, which supplied zircons to the Atasta beach, were the Chiapas Massif and Oaxacan complexes, whereas the zircons in the Alvarado beach were derived from the nearby Mexican Volcanic Belt and Eastern Alkaline Province. The provenance variation between the two beach areas was also revealed by the dissimilarities in zircon age clusters.

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Early Carboniferous black mudstones in the Nujiang Suture Zone in northeast Tibet: implication on paleoenvironment

et al. 2020

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Geochemistry of coastal sands of Eastern Mediterranean: The case of Nisyros volcanic materials

Cited by 11 publications

References 55 publications

The Potential for REE and Associated Critical Metals in Coastal Sand (Placer) Deposits of Greece: A Review

The Potential for REE and Associated Critical Metals in Coastal Sand (Placer) Deposits of Greece: A Review

Provenance discrimination between Atasta and Alvarado beach sands, western Gulf of Mexico, Mexico: Constraints from detrital zircon chemistry and U–Pb geochronology

Early Carboniferous black mudstones in the Nujiang Suture Zone in northeast Tibet: implication on paleoenvironment

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