7 Works

In-situ trace element and S isotope systematics in porphyry-epithermal pyrite, Limnos Island, Greece

Frederik Börner , Manuel Keith , Jonas Bücker , Panagiotis Voudouris , Karsten Haase , Reiner Klemd & Martin Kutzschbach
A more sustainable society with CO2 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-epithermal mineralization on Limnos (Fakos, Sardes, Kaspakas) show variable Te and related element (e.g., Au, Ag) contents, and therefore represent a natural laboratory to define key fractionation...

Geochemical screening of Eocene bivalves: disentangling environmental signals from diagenetic overprint

Jorit F. Kniest , Silke Voigt , Jonathan A. Todd , Julia D. Sigwart , Michael Joachimski , Dominik C. Hezel & Jacek Raddatz
The Eocene ´greenhouse´ climate represents the warmest period within the Cenozoic and has therefore become especially interesting as an analogue for estimated future climate scenarios. For paleo-climate reconstructions, bivalves represent valuable proxy archives with a high temporal resolution, due to their distinct, periodic layering (growth increments). However, interpreting environmental signals from fossil bivalves can be challenging, because of the species-specific mineralogy of the shells (calcite or aragonite) and its associated geochemical behaviour, as well as...

Volcanic structures and magmatic evolution of the Vesteris Seamount, Greenland Basin

Katharina Anna Unger Moreno, Janis Thal , Wolfgang Bach , Christoph Beier & Karsten Matthias Haase
The solitary intraplate volcano Vesteris Seamount is located in the Central Greenland Basin and rises around 3000 m above the seafloor with a total eruptive volume of ~500 km3. Newly acquired high-resolution bathymetry allows through backscatter data and raster terrain analysis to distinguish several volcanic structures. The Vesteris Seamount is a northeast to southwest elongated stellar-shaped seamount with an elongated, narrow summit radially surrounded by irregular volcanic ridges, separated by volcanic debris fans. Whole rock...

Spatial variations in submarine caldera-hosted hydrothermal systems: Insights from sulfide chemistry, Niuatahi caldera, Tonga rear-arc

Jan J. Falkenberg, Manuel Keith, Karsten M. Haase , Reiner Klemd, Harald Strauss , Christian Peters & Jonguk Kim
Deep-sea and Seabed Mineral resources Research centre, Korean Institute of Ocean Science & Technology, 385 Haeyang-ro, Yeongdo-gu, 49111, Korea(3);Submarine “black smoker” systems and their associated seafloor massive sulfides (SMS) may represent economic resources for future generations. However, the processes leading to spatial variations in the mineralogical and chemical composition of subduction zone-related hydrothermal systems remain poorly constrained. The large submarine caldera of Niuatahi volcano hosts several active hydrothermal vent sites associated with faults at the...

Evolution from subduction initiation to mature island arc volcanism in the Upper Eocene to Middle Miocene Vitiaz Arc, SW Pacific: Evidence from Malekula Island (Vanuatu)

Kathrin P Schneider , Karsten M Haase & Bernard Pelletier
The oldest volcanic rocks exposed on Malekula Island, now belonging to the New Hebrides Island Arc, formed in the Upper Eocene to Middle Miocene Vitiaz Island Arc, Southwest Pacific. They are thought to have formed contemporaneously with Fiji and the Izu-Bonin-Mariana (IBM) arc during westward subduction initiation of the Pacific beneath the Indo-Australian Plate [e.g., 1]. To test this hypothesis with regard to the mantle source compositions and contributions from the subducting slab, we provide...

Contrasting rare metal potentials in two Southern Alpine vein deposits

Thomas Angerer , Tim Poniewas , Lorenz Profanter , Martina Tribus & Helene Braetz
Investigating rare metal potentials of the Alpine regions is of great importance to progress towards future supply independence. Sphalerite is an important carrier of Co, In, Ga, Ge, and Sb, and we know from the Eastern Alps, that vein deposits roughly host 66% of the Co, 18% of the Ga and 4% of the In resource. Here, we present data of sphalerite (and chalcopyrite) from two contrasting vein deposits in the Southern Alpine basement: the...

Linking Laser-Ablation ICP-MS analysis and sulfide textures in identifying gold remobilization and enrichment processes in modern seafloor massive sulfides, Kolumbo arc volcano, Greece

Stephanos P. Kilias , Evangelia Zygouri , Nikolaos Zegkinoglou , Manuel Keith , Thomas Zack , Daniel J. Smith , Paraskevi Nomikou & Paraskevi Polymenakou
Target settings to secure sustainable access to raw materials include seafloor massive sulphide (SMS) resources. Gold-rich SMS deposits, are often the result of complex interplay of multiple Au enrichment events. Recent studies have shown that high-grade Au ores result from Au remobilization from preexisting mineralization, driven by fluid-induced coupled dissolution-reprecipitation (CDR) reactions; however investigations into this process in modern Au-rich SMS, are lacking. To tackle this issue, Au-rich [AuBULK≤32ppm; Au/(Cu+Zn+Pb)=1.9], polymetallic (Sb, Tl, Hg, Ag,...

Registration Year

  • 2022

Resource Types

  • Text


  • University of Erlangen-Nuremberg
  • National and Kapodistrian University of Athens
  • University of Münster
  • Institut de Recherche pour le Développement
  • University of Gothenburg
  • Senckenberg Research Institute and Natural History Museum Frankfurt/M
  • GEOMAR Helmholtz Centre for Ocean Research Kiel
  • Korea Institute of Ocean Science and Technology
  • Hellenic Centre for Marine Research
  • Natural History Museum