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陨石撞击曾使地球地表温度超2000℃

2017-09-18 10:51:44   中国青年网

新华社北京9月16日电 一个国际科研团队报告说,地质记录显示,地球表面曾经达到的最高温度超过2370摄氏度,约相当于太阳表面温度的一半。这次高温是大型陨石撞击导致的。

美国和澳大利亚等国科学家在《地球与行星科学通讯》杂志上报告说,大约3800万年前,大型陨石撞击了现今加拿大东部所在区域,留下了一个巨大的陨石坑,即米斯塔斯汀湖陨石坑。研究人员在陨石坑里发现了硅酸锆熔融形成立方氧化锆的迹象,后者在高于2370摄氏度的条件下才能产生。

此前人们推测,大型陨石撞击能产生超过2000摄氏度的高温。但由于陨石和地壳岩石都会在高温中气化,很难留下证据。研究小组首次利用立方氧化锆作为“温度计”,证明地表温度确实能达到这个程度。

地球曾经遭受多次陨石撞击,特别是在形成早期。巨大冲击和高热使地球表面发生巨大变化,还会将大量氢、碳和硫等元素释放到大气中。弄清撞击事件能使地表温度达到何种水平,有助于理解地球变迁和生命发展的历程。

新华社北京9月16日电 一个国际科研团队报告说,地质记录显示,地球表面曾经达到的最高温度超过2370摄氏度,约相当于太阳表面温度的一半。这次高温是大型陨石撞击导致的。

美国和澳大利亚等国科学家在《地球与行星科学通讯》杂志上报告说,大约3800万年前,大型陨石撞击了现今加拿大东部所在区域,留下了一个巨大的陨石坑,即米斯塔斯汀湖陨石坑。研究人员在陨石坑里发现了硅酸锆熔融形成立方氧化锆的迹象,后者在高于2370摄氏度的条件下才能产生。

此前人们推测,大型陨石撞击能产生超过2000摄氏度的高温。但由于陨石和地壳岩石都会在高温中气化,很难留下证据。研究小组首次利用立方氧化锆作为“温度计”,证明地表温度确实能达到这个程度。

地球曾经遭受多次陨石撞击,特别是在形成早期。巨大冲击和高热使地球表面发生巨大变化,还会将大量氢、碳和硫等元素释放到大气中。弄清撞击事件能使地表温度达到何种水平,有助于理解地球变迁和生命发展的历程。

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