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How did plate tectonics help confirm that Pangea existed?
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Pangea
Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins near the end of the Permian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.
The theory of plate tectonics confirmed the existence of Pangea by providing the physical mechanism for the movement of continents, which had previously been an elusive aspect of Alfred Wegener’s earlier hypothesis of continental drift.1
Plate tectonics explains that Earth’s outer shell consists of rigid plates that move apart at oceanic ridges and converge at subduction zones. This framework supported Pangea’s existence through several lines of evidence:1
- Seafloor Spreading: The pattern of seafloor spreading demonstrates that Pangea fragmented in distinct, identifiable stages rather than all at once.1
- Geological Matching: Computer analysis of continental shelves at the 1,000-metre depth contour confirmed an impressive fit between continents like Africa and South America. Furthermore, researchers matched stratigraphic sequences and mountain ranges across the Atlantic Ocean, such as those in North America and Europe.2
- Isotopic Dating: Isotopic dating of Precambrian rocks on opposite sides of the Atlantic revealed that they share the same age and composition, confirming they were once a single, unified landmass.2