magmatism

Zircons, a mineral nearly as old as Earth itself, is a time keeper, and also provides a chemical window into many geological phenomena, such as oxidation state. By determining the oxidation levels of the magmas that formed these detrital zircons, scientists are able to deduce the onset of crust to mantle recycling, weathering, and the supercontinent cycle. Credit: Science China Press Zircons, a mineral nearly as old as Earth…

Anomalous bathymetry and associated intraplate magmatism.(A) Residual bathymetry map of eastern equatorial Pacific Ocean offshore Central America highlights the abundant intraplate magmatism on anomalously shallow seafloor southeast of the Nicaragua Fracture Zone (NFZ). The black line is the colocated controlled-source electromagnetic (CSEM)–MT-MCS profile. The magenta lines show the MCS profiles from TicoFlux (27). The white triangles show the location…