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Archaeology

“Unraveling the Past: How Ancient Tectonics Shape the Fate of Sinking Oceanic Plates”

New findings provide a greater understanding of plate subduction, or how tectonic plates slide beneath one another. This recycling of surface materials and volatile elements deep into the Earth’s interior, can impact long-term climate stability, atmospheric balance, and the habitability of our planet over billions of years.

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A groundbreaking study has revealed that the ancient tectonic history of oceanic plates plays a significant role in determining their fate as they sink into the Earth’s mantle. Researchers from an international team have discovered that compositional rock anomalies within these plates, caused by ancient tectonics, can slow or stagnate the plates’ descent, rather than allowing them to plunge directly into the lower mantle.

The study, published in the journal Nature, focuses on the Caribbean region, where the researchers deployed 34 seismometers on the ocean floor. The data collected from this experiment provided evidence of an exceptionally thick mantle transition zone (MTZ), which can only be explained by a large distribution of basaltic rock compositions within the MTZ.

The findings suggest that entire oceanic slabs, approximately 100 kilometers thick, can possess significant basaltic material. This has important implications for our understanding of plate subduction, which recycles surface materials and volatile elements deep into the Earth’s interior. The study also sheds light on how these processes sustain long-term climate stability, atmospheric balance, and the habitability of our planet over billions of years.

Lead author Dr. Xusong Yang emphasized that the inherited compositional heterogeneity of subducting oceanic slabs can greatly influence their ultimate fate in Earth’s deep interior. This means that the trajectory and speed of sinking plates are not solely determined by their current dynamics, but also by their ancient tectonic history.

The research is part of the VoiLA (Volatiles in the Lesser Antilles) project, which aims to better understand the complex interactions between the Earth’s surface and interior. The team’s groundbreaking findings have provided new insights into the workings of our planet, highlighting the importance of considering the ancient tectonic history of oceanic plates in understanding their fate.

Dr. Kate Rychert, formerly an Associate Professor at the University of Southampton and currently at the Woods Hole Oceanographic Institution, noted that this is the first large-scale ocean bottom seismic experiment conducted at an Atlantic subduction zone. “We were very surprised to find an unexpected and exceptionally thick mantle transition zone beneath the Antilles,” she said.

Dr. Nick Harmon, also from the Woods Hole Oceanographic Institution, added that it’s “wild to think” that tectonic plates have a ‘memory’ and that affects the way they drive mantle convection and mix material back into the Earth. The study’s findings highlight the importance of considering this aspect in understanding the fate of sinking oceanic plates.

Ancient Civilizations

Debunking the Elite: New DNA Research Challenges Ancient Ireland’s Incestuous Social Hierarchy

DNA from a skull found at Newgrange once sparked theories of a royal incestuous elite in ancient Ireland, but new research reveals no signs of such a hierarchy. Instead, evidence suggests a surprisingly egalitarian farming society that valued collective living and ritual.

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In ancient Ireland, around 5,000 years ago, the notion that an incestuous social elite ruled over the people was questioned by new research. The study examined DNA evidence from burials at Newgrange, a prehistoric monument, which previously led to speculation about a ruling class or royal family being buried there.

Researchers analyzed a bone skull fragment found in the chamber and discovered that it belonged to an individual who was likely born of incestuous relationships, but also distantly related to others buried in the same tomb. This finding suggested that only certain individuals were buried in the chamber, implying they held special positions in society.

However, researchers from the University of York and University College Dublin have now shown that there is no evidence of an elite class existing economically or socially among nearby settlements, dietary practices, or trade. They believe that ancient Irish society was more equal, as evidenced by shared resources, similar dwellings, and a lack of large settlement systems or trade mechanisms.

Professor Penny Bickle stated, “The evidence points to a much more collective ethos.” She added, “We can only begin to understand these monuments and tombs if we examine the social lives or the communities that built and used them.”

Newgrange is an ancient monument older than Stonehenge and the Pyramids of Giza, believed to have been built by a farming community in County Meath. The original burial place of the skull fragment, NG10, dated to 3340-3020 BC, was questioned, as its genetic clustering typically reflects distant biological relationships rather than close familial ties.

Associate Professor Jessica Smyth noted that people were selected for burial in passage tombs, but the reasons behind this selection are unknown. She also mentioned that bodies were broken down and mixed with cremated remains before being placed in megalithic monuments, making it unclear who the parents of certain individuals might have been.

Professor Penny Bickle concluded, “It is by no means clear that the monument was the first burial site of NG10.” She added, “As it stands, the incestuous origins of NG10 are a one-off compared to all of the DNA data we have for Neolithic Ireland.”

The research, published in Antiquity, suggests that ancient Irish society might have been more inclusive and equal than previously thought.

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Ancient Civilizations

Uncovering Ancient Native American Farms in Michigan: A Drone-Based Study Reveals 1,000-Year-Old Farming System

In the dense forests of Michigan s Upper Peninsula, archaeologists have uncovered a massive ancient agricultural system that rewrites what we thought we knew about Native American farming. Dating back as far as the 10th century, the raised ridged fields built by the ancestors of the Menominee Indian Tribe covered a vast area and were used for cultivating staple crops like corn and squash. Using drone-mounted lidar and excavations, researchers found evidence of a complex and labor-intensive system, defying the stereotype that small, egalitarian societies lacked such agricultural sophistication. Alongside farming ridges, they also discovered burial mounds, dance rings, and possible colonial-era foundations, hinting at a once-thriving cultural landscape previously obscured by forest.

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The Dartmouth-led study has made a groundbreaking discovery in Michigan’s Upper Peninsula, uncovering a 1,000-year-old Native American farm system that challenges preconceived ideas about agriculture in the region. The Sixty Islands archaeological site along the Menominee River features a raised ridge field system dating back to around the 10th century to 1600. This is the most complete ancient agricultural site in the eastern half of the United States.

The researchers surveyed approximately 330 acres using drone-based lidar, which provided a dataset that revealed clusters of ridged garden beds ranging from 4 to 12 inches in height. These raised fields were used by ancestors of the Menominee Indian Tribe of Wisconsin to grow corn, beans, squash, and other plants.

Lead author Madeleine McLeester noted that the scale of this agricultural system is 10 times larger than previously estimated, forcing a reconsideration of preconceived ideas about agriculture in the region and globally. The team’s findings also suggest that the ancestral Menominee communities were modifying the soil to rework the topography, using wetland soils to enrich the soil and remain from fires as compost.

The researchers conducted excavations at the site, recovering charcoal, broken ceramics, and artifacts, which suggested that remains from fires and household refuse were likely used as compost in the fields. The results showed that the farming system was a massive undertaking requiring organization, labor, and know-how to maximize agricultural productivity.

The findings have significant implications for our understanding of ancient agriculture in eastern North America and challenge existing forest history of the Upper Peninsula. The team is continuing their work with the Menominee Indian Tribe of Wisconsin at the Menominee Sixty Islands site, planning to survey the site and locate ancestral Menominee villages.

This study demonstrates the importance of innovative technologies like drone-based lidar in uncovering hidden archaeological features and provides a unique window into pre-Colonial farming practices in the region. The discovery of this 1,000-year-old farm system serves as a reminder of the rich history and cultural heritage of the Native American communities that once thrived in Michigan’s Upper Peninsula.

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Ancient Civilizations

Uncovering Hidden Secrets: A 3,500-Year-Old Cemetery Reveals New Insights into Bronze Age History

Bronze Age life changed radically around 1500 BC in Central Europe. New research reveals diets narrowed, millet was introduced, migration slowed, and social systems became looser challenging old ideas about nomadic Tumulus culture herders.

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The discovery of a 3,500-year-old cemetery in Hungary has shed new light on a pivotal period in Central European history. A team of international researchers, led by Tamás Hajdu and Claudio Cavazzuti, has conducted a comprehensive bioarchaeological investigation into the Bronze Age cemetery at Tiszafüred-Majoroshalom. The findings have rewritten our understanding of this era, revealing significant changes in people’s lives, diets, social systems, and even burial customs.

The multidisciplinary research was based on the excavation of a Bronze Age cemetery that was used during both the Middle Bronze Age (Füzesabony culture) and the Late Bronze Age (Tumulus culture). By comparing the subsistence strategies before and after this era-changing event, the researchers were able to identify key differences in people’s lifestyles.

The study aimed to answer whether the spread of the Tumulus culture was a result of new groups arriving or if it was simply an evolution of the autochtonous people’s way of life. The team also examined whether changes in settlement patterns around 1500 BC were indicative of a shift towards more mobile and pastoral lifestyles.

The results of this groundbreaking research are nothing short of revolutionary:

* Dietary changes: Nitrogen stable isotope studies revealed that people’s diets became more uniform but poorer during the Late Bronze Age, contradicting previous ideas about the Tumulus culture’s supposed focus on animal husbandry.
* Introduction of broomcorn millet: Carbon isotope analyses indicated that the consumption of this fast-growing and high-energy plant began at the start of the Late Bronze Age, marking the earliest known occurrence in Europe.
* Decreased mobility: Strontium isotope investigations showed that populations from the Middle and Late Bronze Ages had distinct mobility patterns. Fewer immigrants were identified during the Late Bronze Age, with a higher presence of individuals arriving from further geographical regions.

The study’s findings have significant implications for our understanding of this pivotal period in European history. By combining traditional archaeological and anthropological studies with modern bioarchaeological analyses, researchers can now better grasp the complex changes associated with the emergence of the Tumulus culture.

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