tektites


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tektites

(tek -tÿts) Small glassy rounded objects, about 0.1 to 3 cm in size, found only in certain parts of the world, often in vast strewn fields. They have shapes varying from spheroidal to pear-, lens-, and disk-shaped with surface-flow structures indicating that they were formed by rapid cooling of molten material. The chemical composition is that of silicic igneous rock with high SiO2 content (70–80%) and moderate Al2 O3 content (11–15%). They are named according to the place where they are found, e.g. moldavites (Moldavia), australites (Australia), etc. They were probably formed by the fusion of terrestrial material during the impact of giant meteorites; terrestrial and lunar volcanic origins have also been proposed. They are between 0.75–65 million years old. Small tektitelike objects have been found in the lunar regolith.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
The scientists believe that as the water sloshed inland, tektites were falling from the skies, pelting like tiny bullets at terminal velocities of up to 200 miles an hour in a rain of debris killing living things in their path.
"[Most scientists] agree that tektites are in some way or another the result of large meteorite impacts.
Nobody has found tektites like this in the Gulf before.
Renne and his BGC colleagues dated tektites from Haiti, analyzing them using a recalibrated argon-argon technique to determine how long ago the impact occurred.
(1988): Variability in the sculpture of tektites revealed by scanning electron micrographs.
(1993): Chicxulub crater, Yucatan: Tektites, impact glasses, and the geochemistry of target rocks and breccias.
He had spent most of his adult life in the Philippines collecting all sorts of materials from Stone Age tools to tektites that found their way to the Philippines from outer space.
Spitzer's infrared detectors were able to pick up the signatures of the vaporized rock, along with pieces of refrozen lava, called tektites.
The body of the book is divided into three parts, covering minerals, rocks from meteorites to tektites, and fossils.
Mysterious Globs "Tektites are glassy objects found in about a dozen scattered large areas of the earth's surface, and have a chemical composition remarkably like that of clayey sediments....