{"id":10406,"date":"2022-12-10T12:01:15","date_gmt":"2022-12-10T12:01:15","guid":{"rendered":"https:\/\/www.africa-press.net\/cape-verde\/all-news\/mystery-of-origins-of-earths-oxygen-takes-new-twist-after-tantalizing-study"},"modified":"2022-12-10T12:25:53","modified_gmt":"2022-12-10T12:25:53","slug":"mystery-of-origins-of-earths-oxygen-takes-new-twist-after-tantalizing-study","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cape-verde\/all-news\/mystery-of-origins-of-earths-oxygen-takes-new-twist-after-tantalizing-study","title":{"rendered":"Mystery of Origins of Earth\u2019s Oxygen Takes New Twist After Tantalizing Study"},"content":{"rendered":"

Africa-Press – Cape verde. <\/strong><\/span>In its infancy, Earth had low levels of oxygen that could not sustain life. Only after oxygenic photosynthesis kicked in – conversion of sunlight into chemical energy by plants, green algae, and anaerobic cyanobacteria (blue-green algae), did the rise of atmospheric oxygen (O2) pave the way for animal evolution.<\/p>\n

Some of Earth\u2019s early oxygen \u2013 a vital ingredient in the mix of factors rendering our planet habitable \u2013 could have originated from a \u201ctectonic\u201d source, a new study has suggested. Furthermore, research by a team of scientists from Laurentian University and the University of Michigan, published in Nature Geoscience, offers a partial explanation for the lack of oxygen in the form of the molecule (O2) and, accordingly, life on the other rocky planets.<\/p>\n

But first, let\u2019s take a look back at what our planet used to be like between 2.5 billion and four billion years ago. During that period \u2013 the Archean eon \u2013 Earth, a water-world, was shrouded in a haze of methane mist, with no oxygen gas. Oxygen only existed in compounds such as water at the time. This unwelcoming phase in our planet\u2019s life accounts for about one-third of its history.<\/p>\n

There was another aspect to Earth\u2019s existence at the time \u2013 its tectonic activity, which differed from the so-called plate tectonics of modern Earth. The planet we inhabit today is characterized by a phenomenon that witnesses the outermost layer of the Earth under the oceans \u2013 oceanic crust \u2013 sink into the planet\u2019s mantle (snugly lodged between Earth\u2019s crust and its core) at specific points of convergence. The latter are called \u201csubduction zones.\u201d The science is \u201cstill out\u201d on whether such plate tectonics functioned in the Archean era.<\/p>\n

Today\u2019s subduction zones are associated with oxidized magmas, formed when oxidized sediments and cold water close to the ocean floor are introduced into the Earth\u2019s mantle. Magma with a high content of oxygen and water is produced as a result.<\/p>\n

The research carried out by the team, including David Mole at Laurentian University as well as Adam Charles Simon and Xuyang Meng at the University of Michigan, focused on testing if the absence of oxidized materials in Archean bottom waters and sediments could inhibit the formation of oxidized magmas.<\/p>\n

So, the team gathered samples of rocks as old as 2.67 billion years from an area stretching from Winnipeg, Manitoba, to Quebec. This is deemed by scientists to be the largest preserved section of an Archean continent. The study carried out measurements using a technique called X-ray Absorption Near Edge Structure Spectroscopy (S-XANES) at the Advanced Photon Source synchrotron at Argonne National Laboratory in Illinois.<\/p>\n

The results showed that oxidized magmas did form in the Neoarchean era some 2.7 billion years ago. As the absence of dissolved oxygen in water reservoirs of the time failed to obstruct the formation of oxidized magmas in the subduction zones, the research determined that the oxygen source must have been different \u2013 likely originating from volcanic eruptions into the atmosphere. Thus, the study came up with the unexpected conclusion that subduction processes back in the Archean time could have been a vital factor in the oxygenation of the Earth.<\/p>\n

For More News And Analysis About Cape verde<\/a> Follow Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Cape verde. In its infancy, Earth had low levels of oxygen that could not sustain life. Only after oxygenic photosynthesis kicked in – conversion of sunlight into chemical energy by plants, green algae, and anaerobic cyanobacteria (blue-green algae), did the rise of atmospheric oxygen (O2) pave the way for animal evolution. Some of […]<\/p>\n","protected":false},"author":84,"featured_media":10405,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,9],"tags":[233,331,328],"class_list":["post-10406","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-all-news","category-miscellaneous","tag-africa-press","tag-africa-press-cape-verde","tag-cape-verde"],"yoast_head":"\nMystery of Origins of Earth\u2019s Oxygen Takes New Twist After Tantalizing Study - Cape Verde<\/title>\n<meta name=\"description\" content=\"In its infancy, Earth had low levels of oxygen that could not sustain life. 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