Convective upwelling in the mantle beneath the Gulf of California.

Nature
Yun WangBrian Savage

Abstract

In the past six million years, Baja California has rifted obliquely apart from North America, opening up the Gulf of California. Between transform faults, seafloor spreading and rifting is well established in several basins. Other than hotspot-dominated Iceland, the Gulf of California is the only part of the world's seafloor-spreading system that has been surrounded by enough seismometers to provide horizontal resolution of upper-mantle structure at a scale of 100 kilometres over a distance great enough to include several spreading segments. Such resolution is needed to address the long-standing debate about the relative importance of dynamic and passive upwelling in the shallow mantle beneath spreading centres. Here we use Rayleigh-wave tomography to image the shear velocity in the upper 200 kilometres or so of the mantle. Low shear velocities similar to those beneath the East Pacific Rise oceanic spreading centre underlie the entire length of the Gulf, but there are three concentrated locations of anomalously low velocities spaced about 250 kilometres apart. These anomalies are 40 to 90 kilometres beneath the surface, at which depths petrological studies indicate that extensive melting of passively upwelling mantle should beg...Continue Reading

Citations

Jan 24, 2013·Nature Communications·Rosa Ma Prol-LedesmaCarlos Robinson
Mar 20, 2013·Proceedings of the National Academy of Sciences of the United States of America·Yun WangBrian Savage
Oct 19, 2016·Nature Communications·Ryan J GallacherAbdulhakim Ahmed
Mar 22, 2019·Nature·Ståle Emil JohansenBørge Arntsen

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