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Under California: An ancient tectonic plate

By Guest PostMarch 19, 2013Scienceancient tectonic plate, baja peninsula, brian savage, brown university, california, california coast, central california, christina rau, columbia university, donald forsyth, farallon oceanic plate, geologist, high velocity anomaly, isabella anomaly, james gaherty, lithospheric plate, Mexico, nina carriero, north american plate, pacific, rhode island, san andreas fault, seismic tomography data, seismic tomography signature, sierra nevada mountains, under california, university, university of oregon, west coast, yun wang

The Isabella anomaly — indications of a large mass of cool, dehydrated material about 100 kilometers beneath central California — is in fact a surviving slab of the Farallon oceanic plate. Most of the Farallon plate was driven deep into the Earth’s mantle as the Pacific and North American plates began converging about 100 million years ago, eventually coming together to form the San Andreas fault.

PROVIDENCE, R.I. [Brown University] — Large chunks of an ancient tectonic plate that slid under North America millions of years ago are still present under parts of central California and Mexico, according to new research led by Brown University geophysicists. (more…)

‘Novel Ocean-Crust Mechanism Could Affect World’s Carbon Budget’

By Guest PostNovember 17, 2010Environment, Scienceadam soule, atmosphere, baja peninsula, bathymetry, carbon, climate, CO2, crust, daniel lizarralde, earth, gas, giora proskurowski, greenhouse gases, guaymas basin, gulf of california, hydrothermal vent, jeff s seewald, methane, molten magma, north guaymas, ocean, red sea, s adam soule, seafloor, tectonic plates, undersea ridges, volcanic rocks

The Earth is constantly manufacturing new crust, spewing molten magma up along undersea ridges at the boundaries of tectonic plates. The process is critical to the planet’s metabolism, including the cycle of underwater life and the delicate balance of carbon in the ocean and atmosphere.

Now, scientists at the Woods Hole Oceanographic Institution (WHOI) have observed ocean crust forming in an entirely unexpected way—one that may influence those cycles of life and carbon and, in turn, affect the much-discussed future of the world’s climate.

Working at the Guaymas basin in the Gulf of California, WHOI scientists confirmed what they suspected from brief glimpses of the area during previous missions: The inner Earth is injecting swaths of magma called sills as far as 50 kilometers away from the plate boundary, on each side of the ridge —nearly 10 times farther from such an active ocean ridge than had been observed before. (more…)

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Under California: An ancient tectonic plate

‘Novel Ocean-Crust Mechanism Could Affect World’s Carbon Budget’