Pegmatite lithium deposits formed within low-temperature country rocks

Area of Science:

• Geology
• Economic Geology
• Geochemistry

Background:

• Global climate crisis poses a potential supply risk for lithium (Li), a critical element for renewable energy technologies.
• Over half of global lithium production originates from lithium-bearing pegmatites, yet only a fraction are economically viable.
• Understanding factors controlling lithium enrichment in pegmatites is crucial for future resource exploration.

Purpose of the Study:

• To investigate the controlling factors for lithium enrichment in pegmatites.
• To enhance the understanding of lithium pegmatite formation processes.
• To guide future exploration strategies for new lithium resources.

Main Methods:

• Analysis of natural samples from the Jiajika pegmatite deposit in China.
• Application of thermal and diffusion modeling.
• Integration of field data with numerical simulations.

Main Results:

• Lithium content in pegmatites is influenced by both initial melt lithium concentrations and the temperature of the host country rocks.
• Lithium mineralization is favored when lithium-rich pegmatite melts intrude into low-temperature country rocks.
• The thermal regime during emplacement significantly impacts lithium enrichment in pegmatites.

Conclusions:

• The temperature of country rocks during emplacement is a critical factor in forming economically significant lithium pegmatites.
• This finding provides a new perspective on the geological controls of lithium mineralization.
• The study offers valuable insights for targeting lithium exploration efforts globally.