塔吉什湖隕石

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圖片:UWO卡爾加里大學版權所有

去年一月,一顆隕石帶著火熱的軌跡衝入地球大氣層,降落在加拿大塔吉什湖的冰凍表面。今天發表在《科學》雜誌上的新研究表明,這塊古老的岩石可能是迄今為止研究過的最原始的太陽系物質。

根據該報告,塔吉什湖隕石似乎起源於小行星帶中部,是隕石體的一部分,該隕石體在大氣層前的狀態下,質量約為 20 萬公斤。它屬於一類罕見的隕石,稱為碳質球粒隕石,僅佔所有隕石的 2% 左右。此外,對其礦物成分以及碳和氧同位素的分析表明,塔吉什湖代表了一種全新的碳質球粒隕石型別,是已知最原始的。因此,它應該包含太陽系最古老事件的最清晰記錄。美國地質調查局的傑弗裡·N·格羅斯曼在報告的評論中寫道:“我們分析的這種型別隕石材料越原始,我們就越能更好地瞭解我們的太陽系是如何形成的,以及其他太陽系的殘餘物是如何融入其中的。” “自 1969 年 Allende(墨西哥)和 Murchison(澳大利亞)事件引發了我們對隕石及其告訴我們關於早期太陽系的知識的革命以來,塔吉什湖隕石似乎將成為最重要的回收隕落。”

Kate Wong is an award-winning science writer and senior editor at 大眾科學 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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