Tectonic Processes and Mineralization in Island Arc Systems
Summary
Island arc systems develop where one oceanic plate descends beneath another at a convergent margin, giving rise to curved chains of volcanic islands. The subducting slab releases water and volatiles into the overlying mantle wedge, lowering melting temperatures and generating magmas that ascend to form volcanic edifices. Along with eruption, these magmas drive hydrothermal circulation in the crust, leaching metals and precipitating mineralised fluids in veins, breccias and porphyry bodies. The geometry and rate of subduction, slab rollback and arc-parallel faulting influence magma composition, eruption style and the distribution of mineralising fluids. Over time, accreted terranes and ophiolitic fragments can become incorporated into the arc framework, adding complexity to crustal architecture and fluid pathways. The resulting deposits – including copper–gold porphyries, epithermal veins and massive sulphide bodies – represent significant metal resources and inform our understanding of crustal growth, geothermal systems and global element cycles.
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Tectonic Processes and Mineralization in Island Arc Systems publication trend
The graph below shows the total number of articles in tectonic processes and mineralization in island arc systems across all publications each year (not limited to Nature Index journals).
Technical terms
Subduction zone: A convergent plate boundary where one tectonic plate sinks beneath another into the mantle.
Mantle wedge: The region of mantle material above a subducting slab that undergoes partial melting due to slab-derived fluids.
Arc magmatism: The generation of magmas in a volcanic arc, typically driven by fluid-induced melting in the mantle wedge.
Hydrothermal fluids: Hot, metal-rich aqueous solutions that migrate through rock fractures, precipitating ore minerals.
Porphyry deposit: A large, low-grade copper (± gold, molybdenum) deposit formed from magmatic–hydrothermal fluids associated with intrusive stocks.
Epithermal deposit: A near-surface mineral deposit formed by hydrothermal fluids at moderate temperatures, often hosting gold and silver veins.
References
- Discovery of a conical feature in Halmahera waters, Indonesia: traces of a late-stage hydrothermal activity. Geoscience Letters (2023).
- Enhanced arc magmatic productivity of the Western Pacific island arcs deduced from gravity-derived arc crustal growth rates. Frontiers in Earth Science (2023).
- Geochemistry and geochronology of intrusive units in the Suyoc epithermal deposit: Constraints on magma fertility in the Mankayan Mineral District, Philippines. IOP Conference Series Earth and Environmental Science (2022).
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