Sentences with phrase «from volcanic deposits»

Almost all diamonds come from volcanic deposits called kimberlites.

Not exact matches

The deposit is bounded by the Eastern Graben Fault, a major structure that separates the Oligocene age sedimentary and volcanic rocks to the west from Mesozoic metamorphic basement rocks to the east.

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.

«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.»

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.

«Ash from dinosaur - era volcanoes linked with shale oil, gas: Shale oil, gas deposits accompany ash layers from thousands of volcanic eruptions.»

Deposits from past submarine slides also reveal new insights into the development of volcanic islands as they grow under the sea.

These darker regions are covered by dark bedrock and fine - grained sand deposits ground down from ancient lava flows and other volcanic features.

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.

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.»

When this superheated water rises from underground, it passes and often partially melts old lava flow deposits of rhyolite, a volcanic rock of silica - rich composition.

Bentonite clay comes from volcanic ash deposits and oceanic minerals, while diatomaceous earth is a powder made from fossilized phytoplankton.

Bentonite clay typically comes from volcanic ash deposits, while diatomaceous earth is a powder made from fossilized phytoplankton.

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.

They found that the diatom - rich sediments, deposited during the warm intervals, were predominantly composed of material from one terrane - the Jurassic to Cretaceous volcanic rocks and associated sedimentary rocks of the Ferrar Large Igneous Province (FLIP).

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.