Petrogenesis of Granitic Rocks in Continental Crust
Summary
Granitic rocks constitute the dominant component of continental crust and form through a variety of magmatic processes that reorganise crustal and mantle materials. In orogenic belts, partial melting of hydrated lower crust under high temperature and pressure yields S-type granites derived from metasedimentary sources, whereas I-type granites originate from igneous protoliths or mixed mantle-crust melts. A-type granites, often linked to post-collisional or extensional settings, reflect high-temperature underplating and extensive fractional crystallisation. Open-system processes—assimilation of country rock, magma mixing and fractional crystallisation—produce compositional diversity and isotopic heterogeneity. Geochemical and isotopic tracers (Sr, Nd, Hf, O) allow reconstruction of source characteristics and melt evolution. Tectonic drivers range from subduction-related compression to intraplate extension, influencing melt generation depth, melt chemistry and emplacement style. Understanding granitic petrogenesis informs models of crustal growth, recycling and the distribution of critical mineral deposits, and underpins interpretations of continental stability and thermal history.
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Petrogenesis of Granitic Rocks in Continental Crust publication trend
The graph below shows the total number of articles in petrogenesis of granitic rocks in continental crust across all publications each year (not limited to Nature Index journals).
Technical terms
Partial melting: The process by which only a portion of a solid source rock melts to produce a magma of distinct composition.
Fractional crystallisation: Removal of early-forming crystals from a cooling magma, causing the residual melt to evolve chemically.
Assimilation: Incorporation of surrounding country rock into a magma, altering its composition.
Magma mixing: Homogenisation of two or more distinct magmas, producing hybrid compositions.
I-type granite: Granite derived chiefly from igneous protoliths or mantle-derived magmas with subordinate crustal input.
S-type granite: Granite formed by partial melting of metasedimentary or sedimentary source rocks, typically peraluminous.
A-type granite: High-temperature, ferroan, alkaline granite formed in anorogenic or extensional settings, enriched in incompatible elements.
Isotopic ratio: The relative abundance of isotopes (e.g., 87Sr/86Sr, εNd) used to trace source characteristics and melt evolution.
References
- Chemical and isotopic evidence from the laterally asymmetric Bega Batholith for protracted Devonian fluid-induced infracrustal partial melting, eastern Lachlan Fold Belt, southeastern Australia. Chemical Geology (2025).
- Multi-scale isotopic heterogeneity reveals a complex magmatic evolution: An example from the wallundry suite granitoids of the lachlan fold belt, Australia. Frontiers in Earth Science (2023).
- A Tentative Model for the Origin of A-Type Granitoids. Minerals (2023).
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