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Theme Session- Specific Mineral Systems

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1. Golden controversies: classification of epigenetic gold deposits

2. Sediment- and volcanic-hosted copper, zinc and lead deposits

Sediment- and volcanic-hosted base metal deposits comprise the world's largest economic resource of zinc, lead and silver, and are major producers of copper, gold and cobalt. These deposits include VMS, SEDEX, Mississippi Valley-Type, Broken Hill-Type, Sediment-hosted copper, and hybrids of these types. This session aims to explore the characteristics of sediment- and volcanic-hosted base metal deposits, their similarities and differences, their setting in terms of basin evolution, and criteria for exploration.Geoscientists are invited to submit abstracts for oral or poster presentations on these and other interesting aspects of the geology of sediment- and volcanic-hosted base metal deposits.

3. Understanding the porphyry-epithermal transition

This session is devoted to review our current understanding of the porphyry-epithermal transition. All aspects related to the broad field of the porphyr-epithermal link and its transition are welcome, including among others presentation of regional porphyry-epithermal relationships, associations and geologic settings, the temporal relationships of given porphyry-epithermal systems, understanding the magmatic to hydrothermal evolution from examples based on field case studies of porphyry-epithermal systems, as well as from experimental investigations, clarification of the relationship of various types of epithermal deposits (in particular intermediate- or low sulfidation systems) with porphyry deposits, debating cintinua versus gaps in porphyry-epithermal systems, new insights in the fluid evolution and metal transport from deep magmatic systems to shallow epithermal environments, etc.

4.The origin of enriched iron and manganese ore deposits

This session aims to present both descriptions of iron and manganese ore deposits or prospects worldwide and processes that lead to the formation of high-grade iron or maganese ore mineralization. Both supergene and hypogene processes are significant for the formation of high-grade iron and manganese deposits and we encourage studies that cover one or both of these processes.

The focus of this session is on new, innovative research at all scales from mineral/fluid chemistry to tectonic setting. We also encourage presentations on exploration aspects of iron and manganese mineralization (all iron/manganese types).

5.The nature and origin of uranium deposits

 The last few years have seen an enormous increase in uranium exploration efforts worldwide. This growth has been driven by a dramatic rise in global energy demands, the urgent need to shore up energy security in the long term via fuel divesification and improved energy economics, as well as our increasing awareness of global warming and climate change. In response to these challenges, recent years have also seen the spawning of new research ideas, technologies and applied concepts that focus, for example, on uranium mobility and depositional processes in the crust, the characterisation of uranium systems, novel aspects of ore formation mechanisms and exploration targeting, and the numerical modelling of uranium ore systems.

This session on uranium deposits is intended to bring together a diverse group of geoscientists from all corners of the Earth that share an interest in uranium deposits. It will showcase a broad spectrum of new and applied developments and research outputs.

In view of uranium’s relevance for our future, we aim to provide a forum for the dissemination of new knowledge and stimulating discussions. To achieve this, we invite presentations on all aspects that shape and advance our understanding of uranium ore systems and provide stimuli for future directions in research and exploration.

6. Genesis of iron oxide-copper-gold deposits

Spectacular advances in analytical, theoretical modelling and geophysical techniques are offering novel perspectives on the hydrothermal alteration and brecciation processes, magmatic processes, sources of metals and fluids, crustal architecture, thermal anomalies, tectonics and the geodynamic settings that favour the development of giant polymetallic iron-oxide copper-gold (IOCG) deposits in systems involving crustal-scale element mobility and intense metasomatism. Geochronological and isotope studies are also providing much better constraints on the polyphase nature of alteration and mineralisation and the intricate geochemical interplay between volcanism, plutonism, hydrothermal systems and sedimentary basins that lead to these, and related deposits. Fingerprinting the geochemical behaviour of these giant hydrothermal systems starts with fieldwork, moves to state of the art laboratories and then goes back to the field for exploration, a cycle that this session would like to address through thought-provoking and informative oral and poster presentations.

7. Diamonds: Where are they and why?

Understanding where, when and why kimberlites and related magmas are emplaced at the Earths surface and whether or not these unusual magmas contain diamonds is an extremely challenging field of research. Unravelling answers to critical questions relating to the occurrence of, and exploration for diamonds requires the integration of both new and old research from a variety of disciplines and at a range of scales. Why do some regions contain diamond-bearing kimberlites while other areas are completely barren? Why are some epochs favourable for the emplacement of kimberlites while others are not? What is the origin of super deep diamonds and how do the end up at the Earths surface?

Theories of how kimberlites might travel from source to sink can be addressed by utilizing new analytical techniques on minerals or xenoliths (including diamonds) within these magmas or by examining the tectonic conditions that were operating during their emplacement. Pinpointing the timing of emplacement relies on the development of new and accurate methods of dating the magmatic phases or through detailed examination of the relationship between intrusive phases and the host rocks. Developing knowledge about what controls the timing of emplacement is critical because it has fundamental implications for models of kimberlite exploration.

The “where” of kimberlites and diamonds spans disciplines ranging from basin analysis and sedimentary stratigraphy to mantle geochemistry and geophysics. Critical to the discovery of these magmas is knowing why some regions contain abundant kimberlites while other, apparently equally prospective regions, do not. 

Diamonds are a global phenomenon. We aim to attract research from a range of disciplines, bringing together discussion about new ideas and techniques in the hope of building upon existing knowledge to advance our understanding of diamond occurrences. 

      

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