Central Atlantic magmatic province

The Central Atlantic magmatic province (CAMP) stands as the Earth's most extensive continental large igneous province (LIP), a testament to a period of extreme volcanic activity approximately 201 million years ago. Spanning an area of roughly 11 million km², CAMP is predominantly composed of tholeiitic basalts, formed from the rapid eruption and extrusion of vast quantities of magma. Its formation occurred during the critical juncture between the Triassic and Jurassic periods, a time marked by the incipient breakup of the supercontinent Pangaea.

The sheer volume of magma involved, estimated between two and six million cubic kilometers, signifies a mantle-driven event of unparalleled scale within continental settings. The name and acronym were formally proposed by Andrea Marzoli and colleagues in 1999, consolidating research on this widespread geological phenomenon.

The formation of CAMP is intrinsically linked to the rifting of Pangaea, the supercontinent that once comprised most of Earth's landmass. Mantle upwelling, likely driven by a deep thermal anomaly, caused the lithosphere to thin and fracture, initiating the process of continental breakup. This rifting provided pathways for massive volumes of basaltic magma to ascend to the surface.

The eruptive history of CAMP was not monolithic; it comprised at least four distinct eruptive cycles, each potentially lasting no more than a century, yet spread across a span of approximately 600,000 years. Some evidence suggests precursor mafic eruptions may have begun as early as 100,000 years prior to the main pulse. The resulting basaltic dikes, sills, and extensive lava flows now form a geological signature across northwestern Africa, southwestern Europe, northeastern South America, and southeastern North America, marking the initial stages of the Atlantic Ocean's formation.

The immense scale of CAMP's volcanic activity is widely considered a primary driver of the Triassic-Jurassic extinction event, one of the five major mass extinctions in Earth's history. The eruption of such vast quantities of magma would have released enormous volumes of volcanic gases, including carbon dioxide (CO2) and sulfur dioxide (SO2), into the atmosphere. These gases would have triggered rapid and severe climate change, likely leading to significant global warming due to the greenhouse effect of CO2, and potentially ocean acidification.

The environmental upheaval caused by CAMP's eruptions would have stressed ecosystems globally, leading to the demise of numerous terrestrial and marine species. This extinction event dramatically reshaped the biosphere, creating ecological niches that allowed for the subsequent diversification and dominance of dinosaurs throughout the Jurassic and Cretaceous periods.

The geological remnants of CAMP continue to be a crucial focus for scientific research. Studying the composition, distribution, and timing of CAMP's basalts provides invaluable insights into mantle dynamics, continental rifting processes, and the mechanisms of large igneous province formation. Furthermore, the paleoclimatic data preserved within CAMP's rocks and associated sedimentary layers offer a window into the environmental consequences of massive volcanic outgassing.

By analyzing isotopic signatures and paleomagnetic data, scientists can reconstruct past atmospheric conditions and climate shifts, helping us understand the Earth's sensitivity to greenhouse gas emissions. The study of CAMP therefore contributes not only to our understanding of Earth's deep past but also offers relevant analogues for assessing the potential impacts of future anthropogenic climate change.