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Pilbara Craton

All articles tagged with #pilbara craton

science16 days ago•273 min saved

Ancient Earth Moves: Earliest Plate Tectonics Traced to 3.5 Billion Years Ago

Scientists report in Science that Earth’s plate tectonics began much earlier than once thought, with the earliest direct evidence found in the East Pilbara Craton of Western Australia dating to about 3.5 billion years ago in the Archean. By analyzing 900 rock samples for paleomagnetic data, researchers observed a latitude drift from ~53° to ~77° and a clockwise rotation over millions of years, suggesting the lithosphere was segmented rather than a single unbroken shell. Comparative data from the Barberton Greenstone Belt supports this view, implying Earth moved toward plate tectonics much earlier and that early tectonic activity helped shape conditions for life on our planet.

via CNN|

#archean #barberton-greenstone-belt #paleomagnetism

science17 days ago•280 min saved

Ancient rocks reveal Earth's plates were already moving 3.5 billion years ago

A Harvard-led team analyzing 900 rock samples from Australia’s East Pilbara Craton and South Africa’s Barberton Greenstone Belt used paleomagnetism to show Earth’s lithosphere was segmented and actively moving around 3.5 billion years ago, pushing back the onset of plate tectonics and shedding light on early Earth conditions that fostered life.

via CNN|

#archean #barberton-greenstone-belt #paleomagnetism

science21 days ago•6 min saved

Earliest Plate Movements Traced in 3.5-Billion-Year Rocks

By studying magnetism in 3.5-billion-year-old rocks from the Pilbara Craton, researchers traced rapid early plate movement—about 24 degrees of latitude in 30 million years and peak speeds near 47 cm/year—indicating an early, segmented lithosphere and challenging stagnant-lid theories about Earth's first tectonics.

via Indian Defence Review|

#ancient-rocks #early-earth #magnetism

science2 years ago•2 min saved

"Uncovering Ancient Biomass Clues with High-Resolution Techniques"

Researchers using high-resolution techniques have analyzed 3.5 billion-year-old rocks from the Pilbara Craton in Western Australia, revealing new clues about the formation and composition of ancient biomass. The study provides insights into the earliest ecosystems on Earth and suggests that original traces of the first organisms can still be found in extremely old material. The research, published in Precambrian Research, utilized methods such as nuclear magnetic resonance spectroscopy and near-edge X-ray Absorption Fine Structure to analyze carbonaceous particles, shedding light on the history of their deposition and origin.

via Phys.org|

#ancient-earth #biomass #high-resolution-techniques

earth-science2 years ago•2 min saved

Swift and Surprising: The Speed of Early Plate Tectonics

A new study led by Dr. Jennifer Kasbohm of Yale reveals that the Pilbara Craton, an early continent, moved at a rapid pace of up to 64 centimeters (25 inches) per year around 2.7 billion years ago. By analyzing ancient magnetic fields and dating rocks from Western Australia, the researchers aimed to understand the nature of plate tectonics during the Archean eon. The findings suggest that early plate tectonics may have been faster due to the hotter mantle and its impact on mantle convection. The study, which took a decade to complete, provides valuable insights into the movement of ancient continents and the evolution of Earth's tectonic processes.

via Ars Technica|

#archean-eon #basalt-lava #earth-science