Golden magmas: Precambrian magmatism features and relationship to gold and base metals mineralisation (SY-RE2)


Days

Hours

Minutes

Seconds

Golden magmas: Precambrian magmatism features and relationship to gold and base metals mineralisation (SY-RE2)

Lucie Mathieu (UQAC) and Michel Jébrak (UQAM)

Symposium SY-RE2

Leaders and affiliations : Lucie Mathieu (UQAC) and Michel Jébrak (UQAM)

Contact : [email protected]

Description : The exploitation of gold is of great economic importance for Canada. In Archean greenstone belts, most gold and base metals mineralizing processes involve ocean water-derived fluids (volcanogenic massive sulphide deposits – VMS) or metamorphic fluids (orogenic gold deposits). However, a growing number of mineralisation display evidence of magmatic fluids involvement. These deposits have either porphyry characteristics, while others are disseminated sulphides with particular geochemical signatures (Au-Cu-As-Te etc.) designated as “intrusion-related” or “syenite-associated”. Precambrian intrusion-related sensus lato deposits are related to specific magmas, including tonalite-trondhjemite-granodiorite (TTG), sanukitoid, and alkaline intrusions.

These associations shed a new light on the involvement of Precambrian magmas in mineralising processes. In this session, we welcome geochemical, mineralogical, petrological, or other contributions that provide insights into the characteristics of intrusion-related deposits, on the evidence of magmatic fluids involvement in mineralizing processes, on the oxidation state and volatile content of Precambrian magmas, on their source, evolution and interaction with the crust, and on the capacity of these magmas to transport metals. Comparison with Phanerozoic and modern settings are also welcomed. [This is Metal Earth contribution number MERC-ME-2018-038]

Associated theme : Resources, Energy and Environment