| 单词 | tektite |
| 例句 | They resemble volcanic glass but, unlike volcanic glass, tektites contain no water or phenocrysts, and have a different bulk and isotopic chemistry. An Introduction to Geology 2017-01-01T00:00:00Z Dr. Sieh and his colleagues began by studying data showing that Australasian tektites contain elements characteristic of the Laotian volcanic field. Hints of Phantom Crater Found Under Volcanic Plateau in Laos 2020-01-07T05:00:00Z Earlier this year, another research team working in North Dakota reported finding the remnants of an ancient lake containing fossilized fish with tektites in their gills. A New Timeline of the Day the Dinosaurs Began to Die Out 2019-09-10T04:00:00Z Not only is zircon commonly found in tektites, but it is also a choice mineral for radiometric dating, thanks to some of its radioactive elemental components. America's largest asteroid impact left a trail of destruction across the eastern US 2019-08-16T04:00:00Z I took my friend at his suggestion to “examine and research” the teardrop-shaped stone and quickly realized that it is a very special type of rock, a tektite. Catastrophe by Mail 2019-08-09T04:00:00Z Shock metamorphism produces planar deformation features, tektites, shatter cones, and quartz polymorphs. An Introduction to Geology 2017-01-01T00:00:00Z The composition of those beads, or tektites, further suggests that they were formed when a massive asteroid slammed into the Earth with the force of 10 billion Hiroshimas and ended the Cretaceous period. Opinion | You won’t find wonder on Twitter. You have to dig for that. 2019-04-09T04:00:00Z Permeating the deposit were tiny spheres of clay and glass, known as tektites, which formed as molten rock, ejected by the impact, showered from the sky. Fossil Site Reveals Day That Meteor Hit Earth and, Maybe, Wiped Out Dinosaurs 2019-03-29T04:00:00Z They would have continued to fall as the seiche waves rolled in and out, depositing layer upon layer of sediment and each time sealing the tektites in place. The Day the Dinosaurs Died 2019-03-29T04:00:00Z In fact, tektites are only known to exist in four geographical locations: Central Europe, Ivory Coast, Australasia, and Texas and Georgia in North America. Catastrophe by Mail 2019-08-09T04:00:00Z The scientists studied tiny crystals of zircon in the tektites and looked at their geometrical orientation. Glassy debris points to relatively recent asteroid impact in southeast Asia 2018-01-03T05:00:00Z For cancer patients undergoing radiation treatments, Mr. Silva recommends tektite. Character Study: Crystals and Persuasion 2013-08-09T22:25:36Z The fossil deposit also teems with tektites, tiny glass beads that are the telltale fallout of planetary-scale impacts. Fossil Site Reveals Day That Meteor Hit Earth and, Maybe, Wiped Out Dinosaurs 2019-03-29T04:00:00Z It was a tektite, about three millimetres in diameter—the fallout from an ancient asteroid impact. The Day the Dinosaurs Died 2019-03-29T04:00:00Z Glassy spheres known as tektites, shocked quartz and a layer of iridium-rich dust are still found around the world today. Asteroid may have killed dinosaurs quicker than scientists thought 2013-02-08T09:56:51Z The former presence of reidite in these tektites means that they were exposed to crushing pressures and searing temperatures, Cavosie and his team concluded. Glassy debris points to relatively recent asteroid impact in southeast Asia 2018-01-03T05:00:00Z He found three more small craters with tektites in them, which he sectioned and photographed. The Day the Dinosaurs Died 2019-03-29T04:00:00Z Fifty percent of the fossilized fish were found with tektites in their gills, as if the fish had inhaled the material. Fossil Site Reveals Day That Meteor Hit Earth and, Maybe, Wiped Out Dinosaurs 2019-03-29T04:00:00Z As he continued excavating, he found another crater with a tektite at the bottom, and another, and another. The Day the Dinosaurs Died 2019-03-29T04:00:00Z The study looked at tektites from Haiti, tied to the asteroid impact site, and volcanic ash from the Hell Creek Formation in Montana, a source of many dinosaur fossils. Asteroid may have killed dinosaurs quicker than scientists thought 2013-02-08T09:56:51Z Cavosie and his team plan to examine more tektites from the strewn field in the future. Glassy debris points to relatively recent asteroid impact in southeast Asia 2018-01-03T05:00:00Z The block, DePalma said, contained a sturgeon and a paddlefish, along with dozens of smaller fossils and a single small, perfect crater with a tektite in it. The Day the Dinosaurs Died 2019-03-29T04:00:00Z The paper describes how tektites, raining into the water, clogged the gills of fish, which were then killed by surges of water. Fossil Site Reveals Day That Meteor Hit Earth and, Maybe, Wiped Out Dinosaurs 2019-03-29T04:00:00Z Glass turns to clay over millions of years, and these tektites were now clay, but some still had glassy cores. The Day the Dinosaurs Died 2019-03-29T04:00:00Z In addition, an inverted cone of liquefied, superheated rock rose, spread outward as countless red-hot blobs of glass, called tektites, and blanketed the Western Hemisphere. The Day the Dinosaurs Died 2019-03-29T04:00:00Z Lower down, it graded into a more turbulent band of sand and gravel, which contained the heavier fish fossils, bones, and bigger tektites. The Day the Dinosaurs Died 2019-03-29T04:00:00Z Deposits of Chicxulub tektites are rare; the best source, discovered in 1990, is a small outcrop in Haiti, on a cliff above a road cut. The Day the Dinosaurs Died 2019-03-29T04:00:00Z Their chemical composition was unchanged in 66 million years, and it closely matched the unique chemical signature of other tektites associated with the Chicxulub event. Fossil Site Reveals Day That Meteor Hit Earth and, Maybe, Wiped Out Dinosaurs 2019-03-29T04:00:00Z He turned back to the block on his table and held a magnifying lens up to the tektite. The Day the Dinosaurs Died 2019-03-29T04:00:00Z “Amber with tektites embedded in it—holy cow! The dinosaur feathers are crazy good, but the burrow makes your head reel.” The Day the Dinosaurs Died 2019-03-29T04:00:00Z In the week that followed, fresh riches emerged: more feathers, leaves, seeds, and amber, along with several other fish, three to five feet long, and a dozen more craters with tektites. The Day the Dinosaurs Died 2019-03-29T04:00:00Z And yet the tektites fell into an active flood. The Day the Dinosaurs Died 2019-03-29T04:00:00Z The lower parts of the block consisted of debris, fragments of bone, and loose tektites that had been dislodged and caught up in the turbulence. The Day the Dinosaurs Died 2019-03-29T04:00:00Z |
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