塔吉什湖陨石

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图片:UWO卡尔加里大学版权所有

去年一月,一颗陨石带着火热的轨迹冲入地球大气层,降落在加拿大塔吉什湖的冰冻表面。今天发表在《科学》杂志上的新研究表明,这块古老的岩石可能是迄今为止研究过的最原始的太阳系物质。

根据该报告,塔吉什湖陨石似乎起源于小行星带中部,是陨石体的一部分,该陨石体在大气层前的状态下,质量约为 20 万公斤。它属于一类罕见的陨石,称为碳质球粒陨石,仅占所有陨石的 2% 左右。此外,对其矿物成分以及碳和氧同位素的分析表明,塔吉什湖代表了一种全新的碳质球粒陨石类型,是已知最原始的。因此,它应该包含太阳系最古老事件的最清晰记录。美国地质调查局的杰弗里·N·格罗斯曼在报告的评论中写道:“我们分析的这种类型陨石材料越原始,我们就越能更好地了解我们的太阳系是如何形成的,以及其他太阳系的残余物是如何融入其中的。” “自 1969 年 Allende(墨西哥)和 Murchison(澳大利亚)事件引发了我们对陨石及其告诉我们关于早期太阳系的知识的革命以来,塔吉什湖陨石似乎将成为最重要的回收陨落。”

Kate Wong is an award-winning science writer and senior editor at 大众科学 focused on evolution, ecology, anthropology, archaeology, paleontology and animal behavior. She is fascinated by human origins, which she has covered for more than 25 years. Recently she has become obsessed with birds. Her reporting has taken her to caves in France and Croatia that Neandertals once called home, to the shores of Kenya's Lake Turkana in search of the oldest stone tools in the world, to Madagascar on an expedition to unearth ancient mammals and dinosaurs, to the icy waters of Antarctica, where humpback whales feast on krill, and on a "Big Day" race around the state of Connecticut to find as many bird species as possible in 24 hours. Kate is co-author, with Donald Johanson, of Lucy's Legacy: The Quest for Human Origins. She holds a bachelor of science degree in biological anthropology and zoology from the University of Michigan. Follow Wong on X (formerly Twitter) @katewong

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