什么是巴林杰尔火山口?(the barringer crater?)

巴林杰陨石坑,又称流星坑,是地球上保存最完好和最大的撞击坑之一。 巴林杰陨石坑位于亚利桑那州弗拉格斯塔夫以东43英里处,直径约1200米(4000英尺),深170米(540英尺),其边缘从周围的沙漠地形升起45米(150英尺)。 陨石坑内有约240米(800英尺)的碎石,覆盖在坑底。...
The Barringer Crater is near Flagstaff, Arizona, which is located in the American West.

巴林杰陨石坑,又称流星坑,是地球上保存最完好和最大的撞击坑之一。 巴林杰陨石坑位于亚利桑那州弗拉格斯塔夫以东43英里处,直径约1200米(4000英尺),深170米(540英尺),其边缘从周围的沙漠地形升起45米(150英尺)。 陨石坑内有约240米(800英尺)的碎石,覆盖在坑底。

Probably one of the most famous and well-visited craters in the world, the Barringer Crater was made about 50,000 years ago, during the Pleistocene. At the time, the terrain was much wetter and cooler than today, and would have been a grassland occupied by camels, woolly mammoths, and giant ground sloths. A nickel-iron meteorite about 50 meters (164 ft) across impacted the ground at 12.8 kilometers per second (28,600 mph). When it entered the atmosphere, the bolide is estimated to have had a mass of 300,000 tonnes, half of which was lost due to friction by the time it reached the surface. The meteorite hit the ground at an 80 degree angle, ejecting 175 million tonnes of rock and producing an explosion equivalent to about 2.5 megatons of TNT, or 150 times as intense as the atomic bombs that destroyed Hiroshima and Nagasaki. Thousands of plants and animals in the vicinity would have been vaporized instantly.

Initially thought to have been the result of a volcanic steam explosion, the Barringer Crater is the first crater that was recognized as coming from a meteorite impact. In 1903, Daniel Morreau Barringer, a mining engineer and businessman, was the first to suggest the impact theory, which was considered scientifically dubious at the time. It was thought that meteorite impacts were extremely rare. Barringer attempted to dig up the nickel-iron meteorite that created the crater, but failed. The consensus that Barringer Crater was created by a meteorite did not emerge fully until the 1950s, as planetary science became more mature. Only in 1960 did Eugene Shoemaker, the great planetary scientist, find minerals in the crater that definitively proved it was caused by a meteorite impact. Since then, many other craters have been discovered around the world.

  • 发表于 2022-02-09 13:49
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  • 分类:科学

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