Sentences with phrase «volcanic deposits in»

Not exact matches

The climate in the Auvergne also contributes to their unique texture: a lack of humidity and abundant sunshine, courtesy of the surrounding mountains and volcanic deposits, ensures that the lentils dry on the plant all by themselves.

For example, the researchers found higher - than - average concentrations of water in lunar volcanic deposits near the Moon's equator, where background water in the soil is scarce.

The entire cliff would have been deposited very quickly from a fast - moving current of hot gas and ash (a pyroclastic density current), and the extreme temperatures (900-1000 °C) caused the ash to weld to the ground and effectively enameled the area in dense volcanic glass.

The spatial deposition of sulfur particles in the bipolar ice cores, as calculated in the model, agrees well with the actually measured deposits of large volcanic eruptions, such as Pinatubo in 1991 or even of Tambora of 1815.

But geologists have found little evidence of activity in recent eons; the newest volcanic deposits date back millions of years.

«In any case, the results of our model study give a clear indication that the bipolar variability of sulfate deposits must be taken into consideration if the traces of large volcanic eruptions are to be deduced from ice cores,» says Dr. Krüger, «Several research groups that deal with this issue have already contacted us to verify their data through our model results.»

NASA researchers have found that several volcanic deposits on Mercury's surface require mantle melting to have started close to the planet's core - mantle boundary, which lies only 400 km below the planets surface and making it unique in the solar system.

Biologist Sonja Wedmann, then at the Institute of Paleontology at the University of Bonn, analyzed the fossil after it was dug up from oil shale deposits in what was once a small lake formed by volcanic activity.

The volume of ash deposited, and the estimated height of the eruption plume (43 kilometers above sea level) put the eruption's magnitude at a minimum of 7 on the volcanic explosivity index (which has a scale of 1 to 8)-- making it one of the largest known in the Holocene.

A younger volcanic deposit lying in the rock above these fossils includes zircons, tiny bits of silicate mineral that often contain trace amounts of uranium.

After decades of dueling studies about whether it was an asteroid or volcanic eruptions that did in the dinosaurs, it is apparent that the mineral - deposit evidence is indirect and open to interpretation, even if the scientists advancing the various claims sound pretty sure of themselves.

Using radioisotopic dating of underlying volcanic deposits, researchers in 1993 estimated them to be 228 million years old.

Lead author of the study Dr Tom Gernon, Lecturer in Earth Science at the University of Southampton, said: «When volcanic material is deposited in the oceans it undergoes very rapid and profound chemical alteration that impacts the biogeochemistry of the oceans.

«In contrast to most volcanic deposits, the melt inclusions are encased in crystals that prevent the escape of water and other volatiles during eruptioIn contrast to most volcanic deposits, the melt inclusions are encased in crystals that prevent the escape of water and other volatiles during eruptioin crystals that prevent the escape of water and other volatiles during eruption.

On the field trip and from our extensive rock collection, we compared modern to Miocene age (0 - 20 million years old) hot springs in New Zealand with ~ 3.5 billion year old deposits in Western Australia, and we also discussed parallels with some unusual knobby silica deposits at Columbia Hills and other hot spring sinters at El Tatio, Chile, and in the Taupo Volcanic Zone.

Gray rubble on the flanks of Mauna Kea on the island of Hawaii lie in contrast to the red volcanic rock behind them, and were deposited by a glacier that disappeared thousands of years ago.

In contrast, the smaller dark spots (which can appear as gray, brown, or red) may be the remains of low - speed, carbon - rich asteroids that splattered such» deposits» onto Vesta's surface, or they may be the result of higher - speed asteroid that melted and darkened volcanic basaltic crust on crater walls and floors, or on surrounding hills and ridges (NASA DAWN news release).

Geologists have long believed that these minerals were formed by volcanic activity, but in a new study, researchers from McGill University in Canada argue that the silica - rich minerals may have been deposited in the crust of a young Earth by «silicate rain.»

Geologically, Redmond Clay is volcanic ash that was deposited in sea water approximately 150 million years ago.

Bentonite clay is sedimentary clay composed of weathered and aged volcanic ash, the most active deposits of which are in Wyoming and Montana.

100 % Natural Bentonite Clay Redmond Bentonite Clay is the result of volcanic ash deposited in seawater 150 million years ago.

PURE - Redmond Bentonite Clay is the result of volcanic ash deposited in seawater 150 million years ago.

Although no written records exist of the early history of the Phalaborwa district, archaeologists and geologists agree that it was once an area of intense volcanic activity; resulting in rich iron deposits.

The geology of Belize can be divided broadly into the Northern Lowlands, the Maya Mountains, the Toledo Beds and the Pliestocene deposits, but there are other features including volcanic deposits of bentonite in the north and volcanic outcrops along the southern boundary of the Maya Mountains.

Each room category has standard facility such as mini bar IDD Telephone, television satellite, CD and DVD player, Air conditioner, telephone, dressing bath and in room sandal, safety and deposit box, hot and cold running water and sunken bathtub located at suite room, plunge pool, king size bed, day bed and a bathtub made from volcanic stone in valley pool villa and country yard pool villa.

I've sometimes thought that global cataclysms like the largest volcanic eruptions would disrupt the glacial records by many years, like Oruanui eruption c. 26500bp, as these would induce unrecorded behavior in weather and other things, f.e. the huge ash deposits might decrease the albedo so much a local melting event happens.

The massive volumes of volcanic debris deposited in the Spirit Lake and the Toutle River system during the 1980 eruption of Mount St. Helens in southwest Washington State drastically changed the region and left its 50,00... More >>

Geologists generally agreed that sea floor volcanic processes were important in the 1960's in formation of Volcanogenic Massive Sulphide deposits and maybe earlier, however it was not until 1977 that observational proof was acquired.

Active black smokers were first observed in 1977, however the geological record from Archean times revealed deposits of massive sulphides that were laid down on or near the sea floor in volcanic conditions.

The crystals are derived from volcanic ash deposits erupted explosively at Axial Seamount, Juan de Fuca Ridge, in the northeast Pacific Ocean.

Reactive decay is more a problem in the Greenland ice cores (volcanic deposits, more acid) than in Antarctica.