Panagiotis Voudouris

National and Kapodistrian University of Athens | uoa · Department of Mineralogy and Petrology

Genetic models for the formation of K-rich magmas in subduction-related settings range from partial melting of subduction-affected mantle sources to melting of crustal rocks depending on the local tectonic framework. The Miocene high-K calc-alkaline to shoshonitic rocks of Limnos Island reflect the magmatic activity in the northern Aegean, which mi...

In this study, we examined the morphological, chemical, and structural details of tetrahedral pyrite crystals from the Jean Baptiste mine in Lavrion, Greece. Pyrite occurs in three generations. Tetrahedral crystals of the first generation are left- or right-handed with the lowest cubic 23 symmetry. In this generation, there are twins with higher cu...

https://repository.kallipos.gr/handle/11419/8353?&locale=el Το βιβλίο αυτό αναφέρεται στην καταγραφή των σημαντικότερων μεταλλοφόρων κοιτασμάτων της Ελλάδας και στις συνθήκες γένεσής τους σε σχέση με τη γεωτεκτονική εξέλιξη των Ελληνίδων. Έμφαση δίνεται στη γεωλογία, στην τεκτονική, στα πετρώματα ξενιστές και στην ορυκτολογική και γεωχημική σύστασ...

The coastal area of the Kavala district, Northern Greece, is characterized by minerals enriched in rare earth elements (REE). The present study focuses on the mineralogy of the black sands from six different locations and the comprehensive mineral chemistry of the REE-bearing minerals, allanite-(Ce), epidote, monazite, thorite, zircon and titanite....

The genesis of banded iron formations is commonly associated with anoxic and iron-rich (ferruginous) marine conditions throughout the Archean to Paleoproterozoic, and occasionally in the Neoproterozoic. In recent studies, ~2 million-year-old banded iron-rich sedimentary rocks with alternating Fe- and Si-rich bands occurring in the Cape Vani sedimen...

In recent years, the interest of society in the geoenvironment is constantly increasing [...]

Comprehensive mineralogical and petrographic studies require analytical methods capable to report the distribution of major to trace elements within crystals in order to unravel their formation conditions and subsequent evolution. Additionally, the investigation of transition elements (e.g., Ti, V, Cr, Mn, Fe, and Zn) is essential for the comprehen...

Mineralogical and petrographic studies require analytical methods capable to underline the repartition of major to trace elements within geological samples. The EPMA (Electron Probe Micro Analyzer) conventional method used for such investigation, but on restrictive zones, is on the verge to be reached by μLIBS (micro Laser-Induced Breakdown Spectro...

Cyanobacteria are considered to be among the first microorganisms to settle in hot springs where they form a favourable environment for further biological establishment. Nevertheless, the exact pioneer species and how early they start participating in the biomineralisation processes remain unknown. The aim of the present study was twofold, i.e. to...

The aim of this study is to identify the biomineralisation processes in hot springs of North‐West Euboea Island by assessing the physico‐chemical parameters of the hot water, the travertine mineralogical composition and facies, and the cyanobacterial microflora. In the studied area, the main mineral phases are calcite and aragonite, creating lamina...

The emplacement of an I-type granodiorite (11.6-9.5 Ma) in a metamorphic core complex on Serifos Island resulted in the formation of high-and intermediate-temperature skarn bodies. New petrographical and mineralogical data revealed the complexity of the retrograde mineralization stage in the skarn bodies located along the Megalo Livadi Detachment f...

Serifos island is characterized by rich geodiversity, industrial and cultural heritage. The present paper focuses on the geological and mining heritage of Serifos, with the aim of integrating the island in the international environment of Geoparks, in the near future. In this geopark, Serifos can highlight the rich geological heritage of the island...

Laser ablation-inductively coupled plasma-mass spectrometry and electron-probe microanalysis were used to investigate the trace-element contents of sphalerite, chalcopyrite and pyrite from the Plaka Pb-Zn-Ag deposit. Using petrographic observations, the analytical results could be linked to the temporal evolution of the Plaka ore-forming system. Sp...

The Gerakario Cu-Au porphyry deposit in the Kilkis ore district, northern Greece, contains epithermal quartz-stibnite veins on the eastern side of the deposit, which crosscut a two-mica gneiss. Metallic mineralization in these veins consists of stibnite + berthierite + native antimony + pyrite + arsenopyrite, and minor marcasite, pyrrhotite, chalco...

The Triassic volcaniclastic sequence in the Cycladic Blueschist Unit (CBU) of Greece is known to contain several occurrences of metamorphosed Mn mineralization. Despite previous literature reports, a comprehensive and holistic review of the origin of these occurrences is hitherto lacking. Here we revisit the Mn metallogenic system of the CBU throug...

A more sustainable society with CO 2 neutral energy production requires substantial amounts of trace metal(loids). However, our understanding about the fractionation processes of these elements between the epithermal and porphyry environment is still limited, but may be essential to secure the future supply of these rare commodities. The porphyry-e...

Polymetallic Cu-Au-Bi-Pb-Ag-Te±Au-bearing quartz veins occur at Laodikino in the Serbo-Macedonian Massif in northern Greece. They are shear-related and hosted in metamorphic rocks, including two-mica gneisses and schists, biotite gneisses, and amphibolites. Barren aplites, pegmatites, and quartz veins are parallel or intrude along the main schistos...

Kyanite-rich rock samples from Thassos Island, Greece, underwent beneficiation tests aiming to examine their potential as commercial refractory materials. The extracted material was compared to commercial samples of kyanite, andalusite and sillimanite. The experimental procedure combined mineral processing and material characterization. The mineral...

Corundum primary deposits in Greece occur in four locations: Paranesti in Drama and Gorgona in Xanthi, both belonging to the wider Rhodope Massif, as well as, Ikaria island and Kinidaros in Naxos island, both belonging to Attic-Cycladic Massif. Eight samples were examined with spectroscopic methods (FTIR, UV-Vis, EDXRF) in order to better character...

The Pefka Cu-Au-Te-In-Se and nearby St Philippos Pb-Zn-Bi-Sn-Ge-Ga-In vein- and breccia-type deposits in western Thrace, Greece, display strong similarities, but also differences in terms of mineralization style, ore mineralogy, and chemistry, and host rock compositions. The Pefka mineralization consists of two crosscutting vein systems with high s...

Boiling is a crucial process triggering ore formation in magmatic-hydrothermal systems and controlling the enrichment of precious and rare metal(loid)s in epithermal-porphyry mineralizations. Steep physicochemical gradients during boiling of hydrothermal fluids at shallow water depths caused metal(loid) precipitation along a 3 km long Pb-Zn-Ag vein...

The Vathi porphyry Cu-Au±Mo deposit is located in the Kilkis ore district, northern Greece. Hydrothermally altered and mineralized samples of latite and quartz monzonite are enriched with numerous rare and critical metals. The present study focuses on the bulk geochemistry and the mineral chemistry of pyrite, chalcopyrite, magnetite, and titanite....

Compiled data show the age progression of magmatic centers along two approximately linear profiles from NE Greece and NW Turkey to the South Aegean Volcanic Arc (SAVA). The age progression reveals the southwestward migration of arc magmatic activity from Oligocene to present, perpendicular to the Hellenic Trench. This is in accordance with the migr...

Fluid conditions of shallow marine hydrothermal vent sites (<200 mbsl) in island arcs resemble those of subaerial epithermal systems. This leads to a distinct mineralization-style compared to deeper arc/back-arc (>200 mbsl) and mid-ocean ridge-related environments (>2000 mbsl). At Calypso Vents in the Bay of Plenty and Paleochori Bay at the coast o...

The Kallianos Au-Ag-Te deposit in Evia Island (Greece) comprises sixteen syntaxial veins that intersect the schists and marbles of the Cycladic Blueschist Unit. The veins are filled with quartz-I and quartz-II, contain two hypogene ore stages (stages I and II), and are surrounded by infrequent muscovite-chlorite alteration zones. A magmatic origin...

In the Aegean region (Cyclades – Greece), a large part of the Island of Anafi consists of exhumed high-grade metamorphic sequences (amphibolites, serpentinites and metasediments) that have been intruded by Late Cretaceous intermediate and felsic granitoids. These correspond to I-type arc-related rocks, displaying calc-alkaline geochemical affinitie...

Lavrion was an important silver mining district in the ancient world, exploited almost continuously from the fourth millennium BC. Its mining history is central to understanding the availability of silver, lead and copper in Greece and the Aegean through the Bronze age. This history is also relevant to the phenomenal rise of Athens in the 5th centu...

Ophicalcites exposed on the island of Tinos, Greece, occur as ellipsoidal bodies within greenschist-facies phyllites of the Upper Cycladic Unit. Close to their outcrops, blocks of serpentinites, metabasic rocks and metasediments were identified, implying a tectonically dismembered ophiolitic sequence in the study area. The ophicalcites comprise bre...

The Lavrion area corresponds to the western part of the Attic-Cycladic metamorphic belt, in the back-arc region of the active Hellenic subduction zone. Between the Eocene and the Miocene, metamorphic rocks (mainly marbles and schists) underwent several stages of metamorphism and deformation due to collision and collapse of the Cycladic belt. Exhuma...

The Vathi porphyry Cu-Au ± Mo mineralization is located in the Serbo-Macedonian metallogenic province of the Western Tethyan Metallogenic Belt. It is mainly hosted by a latite and is genetically associated with a quartz monzonite intrusion, which intruded the basement rocks of the Vertiskos Unit and the latite, 18 to 17 Ma ago. A phreatic breccia c...

The Oligocene shoshonitic Maronia pluton in NE Greece is part of an age-progressive belt of calc-alkaline intrusions and associated with a porphyry Cu-Mo±Re±Au mineralisation. We present new data on mineral and whole rock compositions as well as Sr, Nd and Pb isotopes of the monzodioritic to granitic rocks from Maronia, including the mineralised mi...

Active, shallow-water (2–10 m below sea level) and low temperature (up to 115 C) hydrothermal venting at Paleochori Bay, nearshore Milos Island, Greece, discharges CO2 and H2S rich vapors (e.g., low-Cl fluid) and high-salinity liquids, which leads to a diverse assemblage of sulfide and alteration phases in an area of approximately 1 km2. Volcanicla...

The Konos Hill and Pagoni Rachi porphyry-epithermal prospects in northeastern Greece are characterized by abundant pyrite that displays important textural and geochemical variations between the various ore stages. It is commonly fine-grained and anhedral in the porphyry-related mineralization (M-and D-type veins), while it forms idiomorphic, medium...

Events associated with convergence of the African and Eurasian plates over the last 200Ma, especially closure of the Tethyan ocean over the last ~100Ma, led to the distinctive Hellenide orogen, a tectonic and geological entity which strongly influenced human history in Attica and the ancient world. This review focusses on tectonic events during the...

The halogens Cl and Br are sensitive indicators for the origin of ore-forming fluids. Here, we use a combination of microchemical and microscopic methods to show that measurable concentrations of these elements commonly occur as atomic-scale substitutions in hydrothermal sphalerite. Furthermore, the Cl/Br ratios of halogen-rich sphalerites are indi...

Gems have been used in the manufacture of jewellery and as ornaments since antiquity. Nowadays, gemmology, i.e., the study of gem materials, is one of the most rapidly expanding fields in the earth sciences. Recent statistics have shown that about 15 billion Euros are annually at stake. This Special Issue emphasises the recent advances in both fund...

The Maronia Cu-Mo ± Re ± Au deposit is spatially related to a microgranite porphyry that intruded an Oligocene monzonite along the Mesozoic Circum-Rhodope belt in Thrace, NE Greece. The magmatic rocks and associated metallic mineralization show plastic and cataclastic features at the southeastern margin of the deposit that implies emplacement at th...

This work presents the results of the mineralogical, petrographic, and geochemical study carried out on representative samples from the large assemblage of the Neolithic stone artifacts found in Drakaina Cave, at Kephalonia island, western Greece. The aim of this study is the determination of the raw materials used for the manufacture of lithic/sto...

The newly-discovered Shuangjianzishan Ag-Pb-Zn deposit with 145 Mt of ore grading 128.5 g/t Ag (locally up to 32,000 g/t) and 2.2 wt.% Pb+Zn is located in the Great Hinggan Range (GHR) Metallogenic Belt, northeastern China, and is currently the largest Ag deposit in Asia. The Ag-Pb-Zn orebodies occur as veins and are hosted primarily by a Permian s...

Gems are materials used for adornment or decoration that must satisfy several criteria where they must be aesthetic and visually appealing; relatively rare; hard and tough enough to resist "normal" wear; and able to withstand corrosion by skin contact and cosmetics [1]. Gems have been used since antiquity thus, gemology, the science dealing with ge...

The volcanic rocks of Kornofolia area, Evros, host a number of epithermal-type veins. The host rocks are Oligocene calc-alkaline andesites to rhyo-dacites. The andesites form hydrothermal breccias and show hydrothermal alteration. The veins comprise mainly silica polymorphs such as quartz, chalcedony and three types of opal (milky white, transparen...

Magnetite is a common accessory phase in various types of ore deposits. Its trace element content has proven to have critical implications regarding petrogenesis and as guides in the exploration for ore deposits in general. In this study we use LA-ICP-MS (laser ablation-inductively coupled plasma-mass spectrometry) analyses of trace elements to che...

The Ari-Charvalos area, part of the famous Lavrion district, was an important mining center during ancient times and the 19th century, with minor exploitation up to the 1950’s. According to Marinos and Petrascheck (1956), mixed sulfide ores with up to Pb 30%, Zn 30 %, were highly enriched in Ag (grades up to 16.000 gr/t Pb). This work presents new...

The Grammatiko Iron oxide deposit (NE Attica region, Greece) is one of the economically most significant iron deposits in the Attic-Cycladic metallogenic province which was extensively mined until 1912. Mineralization is hosted in marbles and developed in the form of replacement bodies. These bodies are structurally controlled and follow large subv...

The Grammatiko Iron oxide deposit (NE Attica region, Greece) is one of the economically most significant iron deposits in the Attic-Cycladic metallogenic province which was extensively mined until 1912. Mineralization is hosted in marbles and developed in the form of replacement bodies. These bodies are structurally controlled and follow large subv...

Precambrian banded iron formation (BIF) is one of the most important mineral resources in China, mostly abundant in the North China Craton (NCC) with relatively less common in South China. Since the BIF and Siliceous rocks are both originated from chemically deposition, the syngenetic BIF and Siliceous rocks could help evaluate their environment of...

The formation of ore deposits in the Lavrion Pb-Zn-Ag district was associated with Miocene detachment that accommodated orogenic collapse and exhumation of high-grade nappes across the ductile-brittle transition. This district consists of (1) low-grade porphyry Mo style, (2) Cu-Fe skarn, (3) high-temperature carbonate replacement Pb-Zn-Ag, and (4)...

In the Hellenides Orogen, minerals of various gem quality occur in various rock types from mainly four tectono-metamorphic units, the Rhodope, Pelagonian, and the Attico-Cycladic massifs, and the Phyllites-Quartzites unit of Crete Island. In crystalline rocks, gemstones are related to both regional metamorphic-metasomatic processes (e.g., gem corun...

The Stypsi Cu-Mo-Au-Re prospect, Lesvos island, a shallow porphyry-epithermal system hosted within a middle Miocene microgranite porphyry, was emplaced along NNE-, NW-and NE-trending structures, within trachyan-desites to trachydacites and felsic pyroclastics of the Stypsi caldera. The mineralization comprises three stages: Stage I is characterized...