Tag

Continentalcrust

All articles tagged with #continentalcrust

science1 month ago•7 min saved

Galactic Passages May Have Shaped Earth's Early Continent Formation

A new study proposes that Earth's continents grew not only from internal geology but also as a result of the Solar System’s orbit through the Milky Way’s spiral arms, which could trigger bombardment by Oort Cloud comets and leave zircon isotope records across Archean cratons. While the timing of arm passages, meteorite impacts, and crustal signals show recurring correlations, the authors caution that this is not proven and suggest comparing Earth records with Moon/Mars data to test the idea.

via ScienceAlert|

#continentalcrust #milkyway #note-only-five-tags-requested-extra-ignored

science-and-technology2 years ago•4 min saved

"Deciphering Archean Plate Tectonics: Between Observations and Theories"

A new study by Prof. Yong-Fei Zheng revises the traditional plate tectonics theory to better interpret Archean geological phenomena, suggesting that early Earth's plate tectonics involved both bottom-up and top-down processes, such as mantle plumes and subduction. The study integrates observations of high mantle temperatures, thick basaltic crust, and a primitive mantle composition to provide a coherent framework for understanding the formation and evolution of Archean continental crust. This holistic approach challenges the notion that plate tectonics did not apply to early Earth and offers insights into the transition from stagnant lid to mobile lid tectonics, contributing to our knowledge of Earth's geodynamic history. The research is published in Science China Earth Sciences.

via Phys.org|

##archean #continentalcrust