The gersdorffite-bismuthinite-native gold association and the skarn-porphyry mineralization in the Kamariza mining district, Lavrion, Greece

Autor(en)

Panagiotis Voudouris, Constantinos Mavrogonatos, Branko Rieck, Uwe Kolitsch, Paul G. Spry, Christophe Scheffer, Alexandre Tarantola, Olivier Vanderhaeghe, Emmanouil Galanos, Vasilios Melfos, Stefanos Zaimis, Konstantinos Soukis, Adonis Photiades

Abstrakt

Vein-type Pb-Ni-Bi-Au-Ag mineralization at the Clemence deposit in the Kamariza and "km3" in the Lavrion area, was synchronous with the intrusion of a Miocene granodiorite body and related felsic and mafic dikes and sills within marbles and schists in the footwall of (and within) the Western Cycladic detachment system. In the Serpieri deposit (Kamariza area), a porphyry-style pyrrhotite-arsenopyrite mineralized microgranitic dike is genetically related to a garnet-wollastonite bearing skarn characterized by a similar base metal and Ni (up to 219 ppm) enrichment. The Ni-Bi-Au association in the Clemence deposit consists of initial deposition of pyrite and arsenopyrite followed by an intergrowth of native gold-bismuthinite and oscillatory zoned gersdorffite. The zoning is related to variable As, Ni, and Fe contents, indicating fluctuations of arsenic and sulfur fugacity in the hydrothermal fluid. A late evolution towards higher sulfur fugacity in the mineralization is evident by the deposition of chalcopyrite, tennantite, enargite, and galena rimming gersdorffite. At the "km3" locality, Ni sulfides and sulfarsenides, vaesite, millerite, ullmannite, and polydymite, are enclosed in gersdorffite and/or galena. The gersdorffite is homogenous and contains less Fe (up to 2 wt.%) than that from the Clemence deposit (up to 9 wt.%). Bulk ore analyses of the Clemence ore reveal Au and Ag grades both exceeding 100 g/t, Pb and Zn > 1 wt.%, Ni up to 9700 ppm, Co up to 118 ppm, Sn > 100 ppm, and Bi > 2000 ppm. The "km3" mineralization is enriched in Mo (up to 36 ppm), Ni (>1 wt.%), and Co (up to 1290 ppm). Our data further support a magmatic contribution to the ore-forming fluids, although remobilization and leaching of metals from previous mineralization and/or host rocks, through the late involvement of non-magmatic fluid in the ore system, cannot be excluded.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

National & Kapodistrian University of Athens, Iowa State University, Université Laval, Université de Lorraine, Université de Toulouse, Technische Universität Bergakademie Freiberg, Aristotle University of Thessaloniki, Institute of Geology and Mineral Exploration (IGME), Naturhistorisches Museum Wien (NHM)

Journal

Minerals

Band

8

Seiten

1-16

Anzahl der Seiten

16

ISSN

2075-163X

DOI

https://doi.org/10.3390/min8110531

Publikationsdatum

11-2018

Peer-reviewed

Ja

ÖFOS 2012

105116 Mineralogie, 105113 Kristallographie

Schlagwörter

ASJC Scopus Sachgebiete

Geology, Geotechnical Engineering and Engineering Geology

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/the-gersdorffitebismuthinitenative-gold-association-and-the-skarnporphyry-mineralization-in-the-kamariza-mining-district-lavrion-greece(d6a34cb1-7caf-4ef5-b135-b4a0525a2a11).html