Bi-Ag-bearing tetrahedrite-tennantite in the Kapsalina copper mineralisation, Thasos island, Northern Greece

Vavelidis, M.; Melfos, Vasilios

doi:10.1127/0077-7757/2004/0180-0149

Cited by 8 publications

(13 citation statements)

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“…As the outcropping parts of this marble unit do not show any obvious weak layer, we expect high pore fluid pressure to have played a significant role in the development of the décollement. Evidence of hot fluids coming from depth is found in the anticline as demonstrated by the low δ 18 O hydrothermal quartz (this study) as well as by fluid inclusions (Vavelidis & Melfos 2004). As hangingwall rock units pass above the blind ramp during extensional displacement, they undergo bending and outer arc stretching giving normal faults and gashes.…”

Section: Discussionsupporting

confidence: 53%

“…Independent evidence of high-T fluid flow in the area is provided by fluid-inclusion data obtained on samples close to the anticline above the ramp (Vavelidis & Melfos 2004). Interestingly, these authors proposed that quartz veins formed at about 200°C between 10 and 90 bar (i.e.…”

Section: Low-temperature Flow Eventsmentioning

confidence: 99%

“…3D) which both suggest that the primary mineralization might be related to Mississippi Valley‐Type processes. Vavelidis & Melfos (2004) report homogenization temperatures of fluid inclusions of about 200°C in quartz samples taken from a quarry located on the blind ramp‐related anticline close to the basin (Fig. 2B).…”

Section: Fluid Flow Evidencementioning

confidence: 99%

“…3D) which both suggest that the primary mineralization might be related to Mississippi Valley-Type processes. Vavelidis & Melfos (2004) quartz crystals are associated with a Bi-Ag-Cu mineralization enclosed in sulphide-and sulphosalt-bearing veins. Salinities of the fluid inclusions are 1.0-3.3 wt% eq.…”

Section: Fluid Flow Evidence Mineralizationmentioning

confidence: 99%

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Fluid circulation related to post‐Messinian extension, Thassos Island, North Aegean

2007

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In the North Aegean Domain, Thassos Island contains a Plio-Pleistocene basin controlled by a large-scale flatramp extensional system with a potential dé collement located at depth within a marble unit. Numerous mineralizations associated with normal faults of Plio-Pleistocene age are the sign of fluid circulation during extension. Two main generations of fluid flow are recognized, related to Plio-Pleistocene extension. A first circulation under high-temperature conditions (about 100-200°C) resulted in dolomitization of marbles near the base of the PlioPleistocene basin. The dolomites are characterized by low d 18 O values (down to 11& versus Standard Mean Ocean Water). Some cataclastic deformation affected the dolomites. Hydrothermal quartz that crystallized in extension veins above a blind ramp also has low d 18 O values (about 13&). This shows that high-temperature fluids moved up from the dé collement level toward the surface. A second downward circulation of continental waters at near-surface temperature is documented by calcite veins in fault zones and at the base of the Plio-Pleistocene basin. These veins have O isotope values relatively constant at about 23-25& and C isotope values intermediate between the high d 13 C value of the carbonate host rock (about 1-3& versus Peedee Belemnite) and the low d 13 C value of soil-derived carbon ()10&). The calcites associated with the oxidative remobilization of primary sulphide Zn-Pb mineralization of Thassos carbonates have comparable O and C isotope compositions. Hot fluids, within the 100-200°C temperature range, have likely contributed to the weakening of the lower marble unit of Thassos and, thus, to the process of dé collement.

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Section: Discussionsupporting

confidence: 53%

Section: Low-temperature Flow Eventsmentioning

confidence: 99%

Section: Fluid Flow Evidencementioning

confidence: 99%

Section: Fluid Flow Evidence Mineralizationmentioning

confidence: 99%

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Fluid circulation related to post‐Messinian extension, Thassos Island, North Aegean

2007

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“…Two Cu-Bi-Ag±Te mineralizations on Thasos island, in Kapsalina and Panagia areas (Fig. 1) have been described by VAVELIDIS et al (1995) and VAVELIDIS & MELFOS (2004).…”

Section: Thasos (Kapsalina and Panagia) Vein Type Ore Mineralizationssupporting

confidence: 54%

Fluid evolution in Tertiary magmatic-hydrothermal ore systems at the Rhodope metallogenic province, NE Greece. A review

Melfos¹,

Voudouris²

2016

Geol Cro

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Characterization of various fluid parameters in magmatic-hydrothermal ore mineralizations is potentially essential for interpretation of the conditions of formation and therefore for mineral exploration. Fluid inclusions can provide a useful and promising tool in the research of the ore forming processes in these systems. This review focuses on the nature, composition and origin of magmatic-hydrothermal ore forming fluids involved in the formation of representative Tertiary ore deposits at the Rhodope metallogenic province in NE Greece. These deposits are spatially related to Tertiary magmatism in NE Greece. Case studies are presented here and include an intrusion-hosted sheeted vein system (Kavala), a Au-rich carbonate replacement and quartz-vein mineralization (Asimotrypes), mineralized veins in Eptadendro-Rachi and Thasos island (Kapsalina and Panagia), porphyry Cu-MoRe -Au deposits in Pagoni Rachi and Maronia and epithermal Au-Ag mineralizations in Perama and Loutros. Hydrothermal fluids rich in CO 2 together with elevated Au and Te content are common and occur at the Kavala intrusion hosted sheeted vein system, at the Asimotrypes Au-rich carbonate replacement mineralization and at the Panagia (Thasos) vein system. We classify all these ore mineralizations as intrusion-related gold systems (IRGS). Transport and precipitation of metals including Au and Te is favoured when CO 2 is present. Precipitation of the ore mineralization takes place due to the immiscibility of the carbonic and the aqueous fluids which have a magmatic origin with the contribution of meteoric water. Cooling of magmatic hydrothermal fluids and dilution with meteoric water is a common cause for ore mineral formation in the vein mineralizations of Eptadendro/ Rachi and Kapsalina Thasos. At the Pagoni Rachi and Maronia porphyry deposits, boiling and the high proportion of the vapour phase are the most essential fluid processes which affected ore formation. The epithermal veins overprinting the Pagoni Rachi and the Maronia porphyry systems and the HS-IS epithermal system in Perama Hill and the IS epithermal mineralization in Loutros are characterized by low to moderate temperatures and low to moderate salinities. Cooling and dilution of the ore fluids are the main process for gold precipitation. We conclude that the different fluid parameters and microthermometric data indicate a variety of fluid origin conditions and sources which can affect the strategy for exploration and prospecting for gold, rare and critical metals.

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Tracing the Eh–pH evolution of Cu–Pb–As–Zn supergene mineralization using detailed petrography in the Cap Garonne mineral deposit (Provence, France)

Poot,

Buelens,

Dekoninck

et al. 2024

Miner Deposita

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Bi-Ag-bearing tetrahedrite-tennantite in the Kapsalina copper mineralisation, Thasos island, Northern Greece

Cited by 8 publications

References 0 publications

Fluid circulation related to post‐Messinian extension, Thassos Island, North Aegean

Fluid circulation related to post‐Messinian extension, Thassos Island, North Aegean

Fluid evolution in Tertiary magmatic-hydrothermal ore systems at the Rhodope metallogenic province, NE Greece. A review

Tracing the Eh–pH evolution of Cu–Pb–As–Zn supergene mineralization using detailed petrography in the Cap Garonne mineral deposit (Provence, France)

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