Natural river deposits may have formed fertile Amazonian Dark Earths
In short: Researchers studying a well-known Amazonian Dark Earth site found that these fertile soils may not have been created by humans. By analyzing nutrient levels and trace elements, the team observed that high concentrations of phosphorus and calcium correlate with minerals from external sources, suggesting natural processes played a primary role.
The study analyzed phosphorus, calcium, and various isotope ratios at a Brazilian Amazon site to determine if the soil's fertility was man-made. The findings suggest that alluvial deposition of minerals and carbon occurred thousands of years before evidence of human agriculture appeared in the region.
While the data points to natural landscape formation, the researchers noted that the hypothesis would need to be corroborated at other sites to confirm a widespread origin.
Why it matters: The fertile soils of the Amazon may be a product of natural river processes that ancient humans later utilized.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Source: Research: Silva et al. (2021). A new hypothesis for the origin of Amazonian Dark Earths. Nature Communications. · cc-by
To cite this card, link to https://intellectplus.co.uk/app/history-research-natural-river-deposits-may-have-formed-fertile-amazonian-dar.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in Archaeology · More in History · Latest · A–Z · All topics
