GEO Solid Earth Brown Bag

Fri, Sep 20, 2019, 12:00 pm to 1:00 pm

Sustainable development and transition to a clean-energy economy is placing ever-increasing demand on global supplies of base metals (copper, lead, zinc and nickel). Alarmingly, this demand is outstripping the present rate of discovery of new deposits, with significant shortfalls forecast in the coming decades. Thus, to maintain growth in global living standards, dramatic improvements in exploration success rate are an essential goal of the geoscience community. Significant quantities of base metals have been deposited by low-temperature hydrothermal circulation within sedimentary basins over the last 2 billion years. Despite over a century of research, relationships between these deposits and geological structures remain enigmatic. Here, for the first time, I will show that 85% of sediment-hosted base metals, including all giant deposits (>10 megatonnes of metal), occur within 200 km of the edges of thick lithosphere, as mapped using surface wave tomography and a parameterisation for anelasticity at seismic frequencies. This remarkable observation implies long-term lithospheric edge stability and a genetic link between deep Earth processes and near-surface hydrothermal mineral systems. This result provides an unprecedented global framework for identifying fertile regions for targeted mineral exploration, reducing the search-space for new deposits by two-thirds on this lithospheric thickness criterion alone.

Location: 
Guyot 220
Speaker(s): 

GFDL Formal Seminar

Thu, Jan 23, 2020, 2:00 pm to 3:00 pm
Location: Smagorinsky Seminar Room

GFDL Informal Seminar

Tue, Jan 28, 2020, 10:30 am to 11:30 am
Location: Smagorinksy Seminar Room 209

GFDL Lunchtime Seminar

Wed, Jan 29, 2020, 12:00 pm to 1:00 pm
Location: Smagorinsky Seminar Room 209

GFDL Formal Seminar

Thu, Jan 30, 2020, 2:00 pm to 3:00 pm
Location: Smagorinsky Seminar Room 209

Fluids Group Seminar/CEE

Thu, Jan 30, 2020, 4:00 pm to 5:00 pm
Location: E225

GFDL Informal Seminar

Fri, Jan 31, 2020, 10:30 am to 11:30 am
Location: Smagorinsky Seminar Room 209

PEI Faculty Seminar

Tue, Feb 4, 2020, 12:30 pm to 1:30 pm
Location: Guyot 10

GFDL Lunchtime Seminar

Wed, Feb 5, 2020, 12:00 pm to 1:00 pm
Location: Smagorinsky Seminar Room 209

Environmental Geology & Geochemistry Seminar (EGGS) Lecture

Thu, Feb 6, 2020, 12:30 pm to 1:30 pm
Location: Guyot 220

GFDL Formal Seminar

Thu, Feb 6, 2020, 2:00 pm to 3:00 pm
Location: Smagorinsky Seminar Room 209