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A new occurrence of terrestrial native iron in the Earth's surface; the Ilia thermogenic travertine case, northwestern Euboea, Greece

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doi: 10.3390/geosciences8080287
Authors:Kanellopoulos, Christos; Valsami-Jones, Eugenia; Voudouris, Panagiotis; Stouraiti, Christina; Moritz, Robert; Mavrogonatos, Constantinos; Mitropoulos, Panagiotis
Author Affiliations:Primary:
National and Kapodistrian University of Athens, Department of Geology and Geoenvironment, Athens, Greece
Other:
University of Birmingham, United Kingdom
University of Geneva, Switzerland
Volume Title:Geosciences (Basel)
Source:Geosciences (Basel), 8(8), 15p. Publisher: Molecular Diversity Preservation International (MDPI), Basel, Switzerland. ISSN: 2076-3263
Publication Date:2018
Note:In English. 84 refs.; illus., incl. plates, 1 table, geol. sketch maps
Summary:Native iron has been identified in an active thermogenic travertine deposit, located at Ilia area (Euboea Island, Greece). The deposit is forming around a hot spring, which is part of a large active metallogenetic hydrothermal system depositing ore-bearing travertines. The native iron occurs in two shapes: nodules with diameter 0.4 and 0.45 cm, and angular grains with length up to tens of µm. The travertine laminae around the spherical/ovoid nodules grow smoothly, and the angular grains are trapped inside the pores of the travertine. Their mineral-chemistry is ultra-pure, containing, other than Fe, only Mn (0.34-0.38 wt.%) and Ni (≤0.05 wt.%). After evaluating all the possible environments where native iron has been reported up until today and taking under consideration all the available data concerning the study area, we propose two possible scenarios: (i) Ilia's native iron has a magmatic/hydrothermal origin i.e., it is a deep product near the magmatic chamber or a peripheral cooling igneous body that was transferred during the early stages of the geothermal field evolution, from high temperature, reduced gas-rich fluids and deposited along with other metals in permeable structural zones, at shallow levels. Later on, it was remobilized and mechanically transferred and precipitated at the Ilia's thermogenic travertine by the active lower temperatures geothermal fluids; (ii) the native iron at Ilia is remobilized from deep seated ophiolitic rocks, originated initially from reduced fluids during serpentinization processes; however, its mechanical transport seems less probable. The native iron mineral-chemistry, morphology and the presence of the other mineral phases in the same thermogenic travertine support both hypotheses.
Subjects:Carbonate rocks; Electron microscopy data; Ground water; Hot springs; Hydrothermal conditions; Iron; Magmatism; Manganese; Metals; Metasomatism; Nickel; Nodules; Sedimentary rocks; SEM data; Serpentinization; Springs; Thermal waters; Travertine; Euboea; Europe; Greece; Southern Europe
Coordinates:N375500 N390000 E0244000 E0225000
Record ID:839257-65
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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