{"id":554792,"date":"2023-03-30T11:29:47","date_gmt":"2023-03-30T15:29:47","guid":{"rendered":"https:\/\/www.rochester.edu\/newscenter\/?p=554792"},"modified":"2023-04-10T13:00:59","modified_gmt":"2023-04-10T17:00:59","slug":"was-plate-tectonics-occurring-when-life-first-formed-on-earth-554792","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/was-plate-tectonics-occurring-when-life-first-formed-on-earth-554792\/","title":{"rendered":"Was plate tectonics occurring when life first formed on Earth?"},"content":{"rendered":"

Zircon crystals and magmas reveal new information about plate tectonic activity on Earth billions of years ago.<\/h2>\n

Earth is a dynamic and constantly changing planet. From the formation of mountains and oceans to the eruption of volcanoes, the surface of our planet is in a constant state of flux. At the heart of these changes lies the powerful force of plate tectonics\u2014the movements of Earth\u2019s crustal plates. This fundamental process has shaped the current topography of our planet and continues to play a role in its future.<\/p>\n

\u201c<\/span>The chances for life to originate increase manifold if there is some planetary dynamism.\u201d<\/div>\n

But what was plate tectonic activity like during early Earth? And was the process even occurring during the time when life is thought to have formed?<\/p>\n

\u201cThe dynamic tectonic nature of the modern Earth is one of the reasons why life exists today,\u201d says Wriju Chowdhury, a postdoctoral research associate in the lab of Dustin Trail<\/a>, an associate professor of earth and environmental sciences<\/a> at the University of Rochester<\/a>. \u201cExploring the geodynamics and the lithological diversity of the early Earth could lead to revelations of how life first began on our planet.\u201d<\/p>\n

Chowdhury is the first author of a paper published in Nature Communications<\/em><\/a> that outlines how Rochester researchers used small zircon crystals to unlock information about magmas and plate tectonic activity in early Earth. The research provides chemical evidence that plate tectonics was most likely occurring more than 4.2 billion years ago when life is thought to have first formed on our planet. This finding could prove beneficial in the search for life on other planets.<\/p>\n

Plate tectonics power the creation and destruction of Earth\u2019s crust<\/strong><\/h3>\n

Plate tectonics on modern Earth is \u201cextremely important,\u201d Trail says, because it is \u201cthe dominant mechanism for the creation and destruction of Earth\u2019s crust.\u201d<\/p>\n

Earth is the only known planet that has a mobile upper crust that is cyclically destroyed and created. The process delivers critical elements, such as iron and magnesium, from the interior of the earth to its surface and controls Earth\u2019s water and carbon cycles. But, more importantly to geologists, plate tectonics melts and mixes rocks to create magmas with specific chemical makeups, depending on the rocks involved and the location where the \u201cdestruction\u201d occurred. The chemical makeup of magma can therefore indicate the style of tectonics that created it.<\/p>\n

Ancient crystals as tiny time capsules<\/strong><\/h3>\n

Chowdhury and his colleagues conducted their research using zircons\u2014tiny crystals in rocks that are like small time capsules. The zircons contain trace amounts of chemical elements, locked into the crystals at the time when the crystals were formed. The researchers date the zircons and then work backward, with zircons revealing information about the chemical makeup of the parent magmas from which the zircons crystallized. Researchers then use information about the magmas to reconstruct the physical and chemical environment\u2014and to infer plate tectonic styles\u2014of the early Earth, during the time when the zircons formed. In this case, the zircons were around 3.8 to 4.2 billion years old.<\/p>\n

According to Chowdhury, most researchers infer information about early Earth using zircons to create probabilistic models to present different tectonic scenarios. Chowdhury and his colleagues went a step further to describe not only the zircons but also the parent magmas.<\/p>\n

\"Microscopic
Rochester researchers Wriju Chowdhury and Dustin Trail reveal information about early Earth using tiny zircon crystals, which are billions of years old and a fraction of a millimeter in size (scale bars are in micrometers, where 1 micrometer = 0.000001 meter). The researchers use an imaging technique called cathodoluminescence that fires electrons from a cathode at a sample. The holes in the crystals are from a laser that removed part of the grain to allow the researchers to acquire chemical information. (Smithsonian Institution photo)<\/figcaption><\/figure>\n

\u201cParent magmas are much more direct and reliable because they are closer to the source\u2014the actual tectonic style,\u201d Chowdhury says. \u201cOur study describes the silicon and oxygen isotopic content of the zircons and the trace element content of the parental magmas, which has not been combined and presented before.\u201d<\/p>\n

Chowdhury, Trail, and their colleagues found chemical similarities between early Earth magmas and modern magmas created at tectonically active plate boundaries such as the Cascade and Aleutian Island chains or areas in Japan and the Andes Mountains.<\/p>\n

\u201cThis suggests tectonic continuity from the ancient to modern times,\u201d Trail says. \u201cThat is, our study shows the earth, billions of years ago, might have operated similarly as it does today.\u201d<\/p>\n

A key characteristic of a habitable planet<\/strong><\/h3>\n

The researchers did not determine whether life existed when plate tectonics began\u2014\u201cneither life nor tectonics have an accurate start date yet,\u201d Chowdhury says, noting that the geology community is divided on these points. But the new data provides chemical evidence suggesting that plate tectonics could have been occurring more than 4.2 billion years ago.<\/p>\n

Whatever the case, he continues, plate tectonics is a key reason why Earth currently has a temperate living environment\u2014and could be an important factor in the search for habitable living environments on other planets.<\/p>\n

\u201cThe chances for life to originate increase manifold if there is some planetary dynamism,\u201d he says.<\/p>\n

\n

Read more<\/strong><\/h3>\n
\n
\n

\"OldHow did Earth avoid a Mars-like fate? Ancient rocks hold clues<\/strong><\/a><\/p>\n

In 2013, the New paleomagnetic research suggests Earth\u2019s solid inner core formed 550 million years ago and restored our planet\u2019s magnetic field.<\/em><\/span><\/p>\n<\/div>\n

\n

\"BlackNew models shed light on life\u2019s origin<\/strong><\/a><\/p>\n

Dustin Trail used experiments and zircon chemistry to build more accurate computer models of fluids that act as pathways from inner Earth to Earth\u2019s surface.<\/span><\/p>\n<\/div>\n

\n

\"CropAre aliens real? Do aliens exist? Technosignatures may hold new clues<\/strong><\/a><\/p>\n

Adam Frank, professor of physics and astronomy, is searching the physical and chemical traces of advanced civilizations among the exoplanets scientists have found so far.<\/span><\/p>\n<\/div>\n<\/div>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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