geology   7562

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(PDF) Mantle instability beneath the Sierra Nevada Mountains in California and Death Valley extension
The Southern Sierra Nevada mountain range rapidly uplifted at ≈ 3.5 Ma simultaneously with a pulse of basaltic volcanism. Xenoliths recovered from volcanics indicate that the range lost a dense crustal root after the Miocene. The vertical motions and removal of the root have been linked to a fast seismic velocity anomaly that extends ≈ 200 km into the mantle but is offset to the west of the range. With visco-elasto-plastic thermo-mechanical numerical models, we have tested the influence of crustal strength on the kinematics of removal and on the amount of associated uplift. We find that delamination of the dense root is the most likely mechanism for gravitational instability to occur. The model satisfies the Plio-Quaternary vertical motions, the shift of the mantle anomaly to the west of the range, and intense Miocene extension to the east. Based on those results, we propose the existence of a dynamic link between the Sierra Nevada mantle instability and Death Valley rifting.
geology  nevada 
3 hours ago by cothrun
Impact crater 19 miles wide found beneath Greenland glacier | Science | The Guardian
“We live on a planet where you can survey anything and you think you know everything,” said Kjær. “But when you see such a big thing as this hiding in plain sight, you realise that the age of discovery is not over yet.”
geophysics  astrophysics  geology 
2 days ago by kmt
Greenland ice sheet hides huge 'impact crater'
...and what will emerge from it when the ice melts???
greenland  geology 
5 days ago by nwlinks
A mud pot is moving across California, and no one knows why
Currently located just north of Niland, the mud pot is moving toward Union Pacific Railroad tracks and giving engineers there a headache. A well dug to depressurize the source of the gas had no effect. Steel walls driven 80 feet into the ground were also nonchalantly circumvented; the mud pot simply ducked under them and continued its freakishly linear path of destruction.

“No one has seen a moving mud pot before,” says David Lynch, a consulting physicist who has long studied the area’s geothermal features. Mud pots and mud volcanoes also generally don’t emit much water, but this one is extremely vigorous, producing somewhere around 40,000 gallons of water a day. Lynch and other experts have taken to calling it a “mud spring.”
mud  geology  california  salton-sea  2018 
10 days ago by zzkt
Seeding and Seeing: The inner colonisation of land and vision | a peer-reviewed journal about_
Precision Farming comes then at the end of a list of what I so far  have been addressing as a set of practices on the ground, and as media operations linked to periods of colonisation and agrarian development. Periods where big portions of the surface of the planet became green: nominally, as in the Green Revolution, or literally, as in post-processed satellital images, where areas that reflect infrared frequencies are rendered in this colour as they trace vegetation activity. In this paper, this has been described in terms of grids and the production of emptiness; the aerial and the new scope of the various transformations; and the chemical as the, so to say, colour fixer. These are episodes, in the end, that might be appraised as a media history of soil.
geology  soil  agrculture  visuality  thermal 
18 days ago by shannon_mattern
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[HTML] Phillipsite and Al-tobermorite mineral cements produced through low-temperature water-rock reactions in Roman marine concrete MD…
architecture  building  lime  mortar  conservation  geology  minerals  roman  history  archaeology  marine  concrete  reference 
19 days ago by asaltydog
Phillipsite and Al-tobermorite mineral cements produced through low-temperature water-rock reactions in Roman marine concrete | American Mineralogist | GeoScienceWorld
Abstract Pozzolanic reaction of volcanic ash with hydrated lime is thought to dominate the cementing fabric and durability of 2000-year-old Roman harbor…
architecture  building  lime  mortar  conservation  geology  minerals  roman  history  archaeology  marine  concrete  reference 
19 days ago by asaltydog

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